Phenomenology 2022 Symposium: From Virtual to Real

9 May 2022, 02:15 → 11 May 2022, 22:30 US/Eastern

University of Pittsburgh

The 2022 Phenomenology Symposium will be held May 9-11, 2022 at the University of Pittsburgh.  It will cover the latest topics in particle phenomenology and theory plus related issues in astrophysics and cosmology. We would like to encourage you to register and submit an abstract for a parallel talk. All talks at the symposium are expected to be in person. We hope to see you in May!

Early registration ends April 15, 2022

Registration closes April 24, 2022

Talk submission ends April 24, 2022

Conference banquet May 10, 2022

PHYSICS TOPICS AND CONFIRMED SPEAKERS:

• Marina Artuso (Syracuse Univ., LHCb): Flavor physics: current status and future goals, an experimentalist perspective
• Jacob Bourjaily (Penn State Univ.): Adventures in perturbation theory
• Anja Butter (Univ. of Heidelberg): Deep learning in particle physics 
• Yanou Cui (UC-Riverside): New ideas in baryogenesis 
• Peter Denton (BNL): Nu physics: Theory and practice
• Cora Dvorkin (Harvard): New era in cosmology
• Dan Hooper (FNAL/U Chicago): New era in astro-particle physics
• Yoni Kahn (UIUC): New approaches to dark matter direct detection
• David Kaplan (Johns Hopkins Univ.): Perspectives in particle physics
• Felix Kling (DESY): Physics at forward facilities
• Xiao Luo (UCSB): Physics with neutrino experiments
• Ian Moult (Yale): Conformal Collider Physics Meets the LHC
• Isobel Ojalvo (Princeton Univ., CMS): HL-LHC and future perspectives
• Nobuchika Okada (Univ. of Alabama): Gravitational waves and particle physics
• Gil Paz (Wayne State Univ.): Heavy flavor physics
• Reinhard Schwienhorst (MSU, ATLAS): Physics results from the LHC
• Blake Sherwin (Cambridge University): Cosmology from gravitational lensing in ACT
• Michael Spannowsky (IPPP, Durham Univ.): New physics at colliders

Mini-Reviews:

Francis-Yan Cyr-Racine (Univ. of New Mexico): The Hubble tension

Radovan Dermisek (Indiana Univ.): muon g-2 and BSM physics 

Joey Huston (MSU/CDF) and Josh Isaacson  (FNAL): On the W-mass measurement

FORUM ON EARLY CAREER DEVELOPMENT: 

Discussion leaders: Prof. Keith Dienes (Univ. of Arizona/NSF), Dr. Robert McGehee (Leinweber Postdoctoral Fellow, University of Michigan)

PITT PACC Travel Awards: With support from the NSF and DOE, there are a number of awards (up to $300 each) available to domestic graduate students for travel and accommodation to Pheno 22. A student applicant should send an updated CV and a statement of financial need, and arrange for a short recommendation letter sent from their thesis advisor, by email to pittpacc@pitt.edu with the subject line "Pheno 22 travel assistance". The decision will be based on the academic qualification, the talk submission to Pheno 22, and the financial need. The deadline for the application is April 18, and the winners will be notified by April 21.  (Each research group may be limited to one awardee. Winners in the previous years may have lower priority for consideration. Winner institutes and names will be announced at the Symposium banquet.)

PHENO 2022 ORGANIZERS: Brian Batell, Arnab Dasgupta, Ayres Freitas, Joni George (contact person), Akshay Ghalsasi, Gracie Jane Gollinger (technical support), Tao Han (chair), Adam Leibovich, Matthew Low, Keping Xie

PHENO 2022 PROGRAM ADVISORS: Vernon Barger, Lisa Everett, Kaoru Hagiwara, JoAnne Hewett, Tae Min Hong, Arthur Kosowsky, James Mueller, Vittorio Paolone, Tilman Plehn, Vladimir Savinov, Xerxes Tata, Andrew Zentner, and Dieter Zeppenfeld. 

SPECIAL NOTE: Full vaccination for COVID-19 is required for all in-person participants.  Participants are requested to wear a face mask during the symposium (except for speakers giving a presentation and for eating/drinking). Masks and the quick antigen test kits will be available at the registration desk. 

LoopFest 2022 will be also held at the University of Pittsburgh right after PHENO 2022, during 12-14 May.

PHENO 2021

pheno22schedule.pdf

Monday, 9 May

Registration and Breakfast

Plenary Monday Early

Convener: Dieter Zeppenfeld

1 Welcome

Speaker: Arthur Kosowsky

2 Physics results from the LHC

Speaker: Reinhard Schwienhorst (Michigan State University (US))

2022-05 Pheno ATLAS CMS.pdf

3 HL-LHC and future perspectives

Speaker: Isobel Ojalvo (Princeton University (US))

Ojalvo_Pheno_HL_LHC_And_Beyond_final.pdf

4 Deep learning in particle physics

Speaker: Anja Butter

Butter Pheno2022 2.pdf

Pheno2022 2.key

Coffee Break

Plenary Monday Late

Convener: Marc Sher (William and Mary College)

5 Cosmology from gravitational lensing in ACT

Speaker: Blake Sherwin (Cambridge University)

PhenoFinal-2.pdf

6 New era in cosmology

Speaker: Cora Dvorkin

Dvorkin_Pheno_May_2022.pdf

7 New era in astro-particle physics

Speaker: Dan Hooper

Pheno-2022-Dan.pdf

Lunch

Forum on early career development

8 Forum on early career development

Speakers: Keith Dienes (University of Arizona), Keith Dienes (University of Arizona), Keith Dienes (Unknown), Robert McGehee (University of California, Berkeley), Robert McGehee

forum.pdf

PHENO 22 Early Career R McGehee.pdf

Axion

Convener: Gustavo Marques Tavares (University of Maryland College Park)

9 Axion dark matter-induced echo of supernova remnants

Axions and axion-like particles (ALPs) are a theoretically promising dark matter candidate. In the presence of radio emissions from bright astrophysical sources, nonrelativistic ALPs can undergo stimulated decay to two nearly back-to-back photons, giving bright radio sources counterimages ("echoes") in nearly the exact opposite spatial direction. These echoes are spectrally distinct, and travel galactic distances to allow one to look back in time. In this talk, I will present a recent work showing that ALP-induced echoes of supernova remnants may be bright enough to be detectable by current radio telescopes, and their non-detection may be able to set the strongest limits to date on ALP dark matter in the 1-10 $\mu$eV mass range where there are gaps in coverage in past experiments.

Speaker: Yitian Sun

axion_12.pdf

10 Polarization Signals of Axions at Magnetic White Dwarfs

I will discuss a novel search for axions using observations of magnetic white dwarfs (MWDs). Photons produced as thermal radiation at the MWD surface may convert into an axion as they traverse the magnetosphere, but only if they are polarized parallel to the MWD magnetic field. This introduces a linear polarization in MWD optical spectra that points perpendicular to the MWD magnetic field. I detail the analysis of archival linear polarization spectra of the nearby MWD SDSS J135141.13+541947.4 to set the constraint $|g_{a\gamma\gamma}| \leq 5.4 \times 10^{−12}$ GeV$^{−1}$ at $95\%$ confidence for axion masses $m_a \leq 3 \times 10^{−7}$ eV, which disfavors the axion explanation of the TeV transparency anomaly.

Speaker: Chris Dessert

Pheno_2022.pdf

11 Axion mass from magnetic monopole loops

We show that axions interacting with abelian gauge fields obtain a potential from loops of magnetic monopoles. This is a consequence of the Witten effect: the axion field causes the monopoles to acquire an electric charge and alters their energy spectrum. The axion potential can also be understood as a type of instanton effect due to a Euclidean monopole worldline winding around its dyon collective coordinate. We also discuss how this potential affects phenomenology in the case of a minimal U(1) hidden sector.

Speaker: Katherine Fraser (Harvard University)

Fraser_Pheno_2022_Talk.pdf

12 Underdamped Axionic Blue Isocurvature Perturbations

Previous computations of strongly blue tilted axionic isocurvature spectra were computed in the parametric region in which the lightest time-dependent mass is smaller than the Hubble expansion rate during inflation, leading to an overdamped time evolution. Here, we present the strongly blue tilted axionic isocurvature spectrum in an underdamped time evolution parametric regime. Somewhat surprisingly, there exist parametric regions with a strong resonant spectral behavior that leads to rich isocurvature spectral shapes and large amplitude enhancements. We focus on computing this resonant spectrum analytically in parametric regions amenable to such computations. Because the spectrum is sensitive to nonperturbative classical field dynamics, we will discuss a wide variety of analytic techniques that are used like decoupling, nonlinear field redefinition, a time-space effective potential obtained by integrating out high-frequency fluctuations, and a piecewise mass-model.

Speaker: SAI CHAITANYA TADEPALLI

Conf_talk_Pheno_2022.pdf

13 Altered Axion Abundance from a Dynamical Peccei-Quinn Scale

I will discuss a model in which the relic abundance of axions is altered from the standard misalignment mechanism, either increased or decreased, due to the presence of a new light scalar that couples to the radial part of the Peccei-Quinn (PQ) field. The light scalar makes the effective PQ symmetry-breaking scale dynamical, altering the early-time dynamics for the axion and affecting its late-time dark matter abundance. I will present a semi-analytical analysis and a numerical analysis of this new mechanism, showing that it can accommodate both lighter or heavier axion dark matter, compared to the standard treatments. I will briefly comment on the implications of the model for axion searches and fundamental physics. This talk is based on the work in 2203.15817.

Speaker: Itamar J. Allali

DynamicalPQMechanismPHENO2022.pdf

14 Electroweak ALP Searches at a Muon Collider

A high-energy muon collider with center-of-mass energy around and above 10 TeV is also a vector boson fusion (VBF) machine, due to the significant virtual electroweak (EW) gauge boson content of high-energy muon beams. This feature, together with the clean environment, makes it an ideal collider to search for TeV-scale axion-like particles (ALP) coupling to Standard Model EW gauge bosons, which current and other future colliders have limited sensitivities to. We present detailed analyses of heavy ALP searches in both the VBF and associated production channels at a muon collider with different running benchmarks. We also show projected constraints on the ALP couplings in the effective field theory, including an operator with its coefficient not determined by the mixed Peccei-Quinn anomaly. We demonstrate that a muon collider could probe new ALP parameter space and push the sensitivities of the couplings between the ALP and EW gauge bosons by one order of magnitude compared to HL-LHC. The projected limits and search strategies for ALPs could also be applied to other types of resonances coupling to EW gauge bosons.

Speaker: Yunjia Bao (Brown University)

Bao_Pheno2022_09_May_2022_Handout.pdf

15 Heavy QCD Axions at the LHC and Neutrino Experiments

Heavy QCD axions with masses O(GeV) and decay constants O(1-100 TeV) can solve the Strong CP and the Axion Quality Problem. They also represent an interesting target for various terrestrial searches. In this talk, I will discuss two new approaches in searching for such axions: (a) a trigger-level analysis to look for low-mass diphoton resonances at the LHC; and (b) looking for fermionic final states at present and future neutrino experiments.

Speaker: Soubhik Kumar (UC Berkeley)

heavy_axions_SK.pdf

BSM I

Convener: Shreyashi Chakdar (oklahoma state university)

16 New Physics in Triboson Event Topologies

We present a study of the sensitivity to models of new physics of proton collisions resulting in three electroweak bosons. As a benchmark, we analyze models in which an exotic scalar field $\phi$ is produced in association with a gauge boson ($V=\gamma$ or $Z$). The scalar then decays to a pair of bosons, giving the process $pp\rightarrow \phi V\rightarrow V'V''V$. We interpret our results in a set of effective field theories where the exotic scalar fields couple to the Standard Model through pairs of electroweak gauge bosons. We estimate the sensitivity of the LHC and HL-LHC datasets and find sensitivity to cross sections in the 10 fb -- 0.5 fb range, corresponding to scalar masses of 500 GeV to 2 TeV and effective operator coefficients up to 35 TeV.

Speaker: Matthew Smylie

triboson_talk.pdf

17 New light vector bosons: electroweak precision measurements

Focusing on the phenomenological constraints that precision measurements can provide on the gauge sector of the electroweak group, we aim to pursue a new precision program in which the most generic modifications due to new physics will be considered. We intend to apply this formalism to theories that extend the Standard Model gauge symmetry by a new Abelian group called $U(1)_{X}$. The gauge boson associated with $U(1)_{X}$ can mix with both the Standard Model Z boson and photon through the kinetic term. Furthermore, depending on how we choose to break this extra symmetry, the new gauge boson X can also have a mass mixing with them. Such mixings imply in three new eigenstates: the photon and Z boson we observe are now a mixture of the Standard Model fields and the X boson field. The same is true for the third observable eigenstate, which is known as Z' boson. In this work, we propose the Z' to be in the eV-GeV mass range. Such mass range has been of great interest to physicists since they realized new particles can be quite light and still have evaded discovery in particle accelerators. Our analysis consists in performing a global fit to LEP1 and LEP2 observables. This allows us to determine an exclusion region in the parameter space of our model and establish the mass range of the Z' boson consistent with current experimental data.

Speaker: Fernanda Huller

Pheno_Seminar_Presentation.pdf

18 Complex Scalar Singlet Model Benchmarks

The complex scalar singlet extension has three massive scalar states with interesting decay chains which will depend on the exact mass hierarchy of the system. We find maximum branching ratios for resonant double Standard Model-like Higgs production, resonant production of a Standard Model-like Higgs and a new scalar, and double resonant new scalar production. This is particularly interesting because instead of direct production, the main production of a new scalar resonance may be from the $s$-channel production and decay of another scalar resonance. That is, it is possible for discovery of new scalar resonances to be from the cascade of one resonance to another. We choose our benchmark points to have to have a large range of signatures: multi-$b$ production, multi-$W$ and $Z$ production, and multi-125 GeV SM-like Higgs production. These benchmark points can provide various spectacular signatures that are consistent with current experimental and theoretical bounds.

Speaker: Samuel Lane (University of Kansas)

Lane_pheno2022.pdf

19 Catching Heavy Vector Triplets with the SMEFT: from one-loop matching to phenomenology

An important question for both phenomenologists and experimentalists is whether one can put limits on UV model parameters by matching the full theory onto the SMEFT. I will show that this is possible and explore the complementarity between SMEFT and model-specific approaches.
In particular, I will focus on an additional theory uncertainty arising from the matching at one-loop and discuss how this affects the limits set for the Heavy Vector Triplet extension of the Standard Model. I use the SFitter framework to derive limits, taking into account Higgs, diboson and electroweak precision measurements previously implemented, as well as two new resonance searches for VH and VV. I will discuss the impact of those measurements on the fit and the complementarity of our results with direct searches.

Speaker: Emma Geoffray (Heidelberg University)

Pheno_Geoffray_Full.pdf

Pheno_Geoffray_Handout.pdf

20 Search for heavy resonances in diboson final states at CMS

Searches for new resonances in di-boson final states (VV and VH, where V = W, Z) and tri-boson (VVV) final states, with the CMS detector are presented. The results are based on the large dataset collected during Run 2 of the LHC at a centre-of-mass energy of 13 TeV. The analyses are optimised for high sensitivity over a large range in resonance mass. Jet substructure techniques are used to identify hadronic decays of highly-boosted W, Z, and H bosons. A statistical combination of these searches provides the most stringent constraints on heavy vector bosons with large couplings to standard model bosons and fermions.

Speaker: Irene Zoi (Fermi National Accelerator Lab. (US))

Pheno2022_DibRes_IreneZoi_update.pdf

21 Searches for new physics in events with leptons in the final state in CMS

Many new physics models, e.g., compositeness, extra dimensions, extended Higgs sectors, supersymmetric theories, and dark sector extensions, are expected to manifest themselves in the final states with leptons and photons. This talk presents searches in CMS for new phenomena in the final states that include leptons and photons, focusing on the recent results obtained using the full Run-II data-set collected at the LHC.

Speaker: Joseph Reichert (Cornell University (US))

2022-05-09 Pheno22 New Physics with Leptons at CMS.pdf

22 BSM Higgs decays and extended Higgs sectors in CMS

This talk will cover research searches for extended HIggs sectors, including additional (charged) Higgs bosons and resonant HH production. The talk will also cover searches for BSM decays of the H(125) boson.

Speaker: Siqi Yuan (Boston University (US))

2022-05-09_pheno2022_cms.pdf

Cosmology I

Convener: Kim Berghaus (Johns Hopkins University)

23 The Hubble tension

Speaker: Francis-Yan Cyr-Racine (University of New Mexico)

PHENO22_Hubble.pdf

24 Gravitational Waves from Early Universe Turbulent Sources at the QCD Scale

Gravitational waves (GWs) may be sourced by hydrodynamic and hydromagnetic turbulent sources in the early universe at epochs such as the cosmological quantum-chromodynamic (QCD) transition. I will discuss the results of numerical simulations of GWs from the QCD scale induced by various models of primordial turbulence: purely hydrodynamical turbulence induced by fluid motions and magnetohydrodynamic (MHD) turbulence dominated either by kinetic or magnetic energy, both with and without helicity. I will show that the efficiency of GW production and the GW energy spectra depend strongly on the nature of the turbulence. Prospects for detecting these GW signals from the QCD scale through pulsar timing arrays and astrometric missions will be addressed. In particular, I will discuss the potential of explaining the possible detection of a stochastic GW background by the NANOGrav collaboration with turbulence at the QCD scale and the constraints this observation could place on the properties of such turbulence.

Speaker: Emma Clarke

25 Detecting High-Frequency Gravitational Waves with Microwave Cavities

We give a detailed treatment of electromagnetic signals generated by gravitational waves (GWs) in resonant cavities. We show that it is crucial to carry out the signal calculation in a preferred frame for the laboratory, the proper detector frame. The proper detector frame metric is obtained by resumming short-wavelength effects to provide analytic results that are exact for GWs of arbitrary wavelength. This formalism allows us to firmly establish that, contrary to previous claims, cavity experiments designed for the detection of axion dark matter only need to reanalyze existing data to search for high-frequency GWs with strains as small as $ℎ\sim 10^{-22}-10^{-21}$. We also argue that directional detection is possible in principle using readout of multiple cavity modes.

Speaker: Jan Schütte-Engel

HFGWs.pdf

26 Detecting the stochastic gravitational wave background from massive gravity with pulsar timing arrays

We explore the potential of pulsar timing arrays (PTAs) such as NANOGrav, EPTA, and PPTA to detect the stochastic gravitational wave background in theories of massive gravity. In general relativity, the function describing the dependence of the correlation between the arrival times of signals from two pulsars on the angle between them is known as the Hellings-Downs curve. We compute the analogous overlap reduction function for massive gravity, including the additional polarization states and the correction due to the mass of the graviton, and compare the result with the Hellings-Downs curve. The primary result is a complete analytical form for the analog Hellings-Downs curve, providing a starting point for future numerical studies aimed at a detailed comparison between PTA data and the predictions of massive gravity. We study both the massless limit and the stationary limit as checks on our calculation, and discuss how our formalism also allows us to study the impact of massive spin-2 dark matter candidates on data from PTAs.

Speaker: Qiuyue Liang

PTA& massive gravity Pheno 2022.pdf

27 A Cosmological Lithium Solution from Discrete Gauged Baryon Minus Lepton Number

We propose the infrared gauge symmetry of our sector includes an unbroken discrete gauged subgroup of baryon minus lepton number of order 2 x 3 colors x 3 generations = 18, the inclusion of which does not modify local physics. We UV complete this at Λ as the familiar U(1)_{B-NcL} Abelian Higgs theory, and the early universe phase transition forms cosmic strings which are charged under an emergent higher-form gauge symmetry. These topological defects catalyze interactions which turn 3 baryons into 3 leptons at strong scale rates in an analogue of the Callan-Rubakov effect.

The cosmological lithium problem---that the observed primordial abundance is lower than theoretical expectations by a factor of a few---is perhaps the most statistically significant anomaly of SM+ΛCDM, and has resisted decades of attempts by cosmologists, nuclear physicists, and astronomers alike to root out systematics. We write down a model in which B-NcL strings superconduct bosonic global baryon plus lepton currents and catalyze solely 3p+ → 3e+. We suggest that such cosmic strings have disintegrated O(1) of the lithium nuclei formed during Big Bang Nucleosynthesis and estimate the rate, with our benchmark model finding Λ∼10^8 GeV gives the right number density of strings.

Speaker: Seth Koren

KorenPhenoSlides-Seth.pdf

28 Variability in Quasar Light Curves: using quasars as standard candles

A relation between the variational slope, $s_F$ , and the mean absolute magnitude, $\langle M \rangle$, in the light curves of 58 spectroscopically confirmed quasars is measured with a dispersion of 0.15dex. Assuming it holds for quasars in general, not only does this relation add to our working knowledge of quasar variability but it also shows great promise at accurately measuring luminosity distance to a quasar in a model independent way. An accurate, model independent measure of the luminosity distance would allow quasars to be added to the cosmic distance ladder, easily extending the ladder out far beyond the redshifts accessible to type Ia supernovae where cosmological parameters can be better constrained.

Speaker: Rance Solomon

PHENO_2022.pdf

DM I

Convener: Ying-Ying Li (Fermilab)

29 Searches for dark matter with the ATLAS detector

The presence of a non-baryonic Dark Matter (DM) component in the Universe is inferred from the observation of its gravitational interaction. If Dark Matter interacts weakly with the Standard Model (SM) it could be produced at the LHC. The ATLAS experiment has developed a broad search program for DM candidates, including resonance searches for the mediator which would couple DM to the SM, searches with large missing transverse momentum produced in association with other particles (such as light and heavy quarks, photons, Z and H bosons) called mono-X searches and searches where the Higgs boson provides a portal to Dark Matter, leading to invisible Higgs decays. The results of recent searches on 13 TeV pp data, their interplay and interpretation will be presented.

Speaker: Benjamin John Rosser (University of Chicago (US))

pheno_atlas_dm.pdf

30 Exploring Multilepton Signatures From Dark Matter at the LHC

Limitations on the most general mono-X Dark Matter signature at colliders motivate searches beyond this, such as multilepton plus missing energy signatures. In this talk I present our latest limits on the inert 2-Higgs Doublet model (I2HDM) and Minimal Fermion Dark Matter model (MFDM) for 8/13 TeV pp collisions at the LHC, producing 2-3 leptons plus missing energy final states, using CheckMATE. I will show how 3 lepton final states play an important role, with a leading role in the MFDM case via cascading Higgs decays. We also provide limits and efficiencies for re-interpretation of any scalar of fermion DM model by the community.

Speaker: Arran Charles Freegard (Queen Mary University of London (GB))

31 Dark Matter searches in CMS

Searches in CMS for dark matter particles, mediators, and dark sector extensions will be presented. Various final states, topologies, and kinematic variables are explored utilizing the full Run-II data-set collected at the LHC.

Speaker: Siqi Yuan (Boston University (US))

PHENO_dark_matter_Siqi.pdf

32 Dark Photons and Displaced Vertices at the MUonE Experiment

MUonE is a proposed experiment designed to measure the hadronic vacuum polarization contribution to muon $g-2$ through elastic $\mu−e$ scattering. As such it employs an extremely high-resolution tracking apparatus. We point out that this makes MUonE also a very promising experiment to search for displaced vertices from light, weakly-interacting new particles. We demonstrate its potential by showing how it has excellent sensitivity to dark photons in the mass range $10~\mathrm{MeV} \leq m_{A^\prime} \leq 100~\mathrm{MeV}$ and kinetic mixing parameter $10^{-5} \leq \epsilon e \leq 10^{-3}$, through the process $\mu^- e^- \rightarrow \mu^- e^- A^\prime$ followed by $A^\prime \rightarrow e^+ e^-$.

Speaker: Isaac Wang

DarkPhotonMUonE_IRW.pdf

33 Studying Dark Z at Future e+ e- Colliders

Additional gauge interactions are ubiquitous in well motivated extensions of the Standard Model (SM); a particularly simple example is that of an extra $U(1)$ gauge group. In this work, we study the case in which there are simultaneously both kinetic mixing and mass mixing (arising from the Higgs sector) of this extra $U(1)$ into the SM. We show that the additional gauge boson, called the 'dark $Z$', can potentially be discovered at future $e^+ e^-$ colliders (e.g. the ILC). In addition, we demonstrate how the ILC can perform precision studies on the dark $Z$'s couplings with SM fermions.

Speaker: Yik Chuen San (Cornell University)

DarkZFutureColliders.pdf

34 Light $Z^\prime$ and Dirac fermion dark matter at "Lifetime Frontier" Experiements

We consider a $U(1)_{B-L}$ model with a $Z^\prime$ portal Dirac fermion dark matter (DM) $\chi$ of low mass which couples very weakly to the $B - L$ gauge boson $Z^\prime$. An arbitrary $B-L$ charge $Q\neq \pm1, \pm 3$ of the DM $\chi$ ensures its stability. Motivated by the sensitivity reach of forthcoming ``Lifetime Frontier" experiments, we focus on the $Z^\prime$ mass, $m_{Z^\prime}$, in the sub-GeV to few GeV range. We examine both the freeze-out and freeze-in DM scenarios. For the freeze-out scenario, the observed DM abundance is reproduced near the $Z^\prime$ resonance. For the freeze-in scenario, we focus on $m_\chi \ll m_{Z^\prime}$. We show that $g_{BL}$ values roughly scale as $1/Q$ to reproduce the observed DM abundance. For various $Q$ values in the range between $10^{-6}$ and $10^2$, we show that the gauge coupling values $g_{BL}$ needed to reproduce the observed DM abundance lie in the search reach of future planned and/or proposed experiments such as FASER, Belle-II, LDMX, and SHiP. In the freeze-in case, the $Q$ values to realize observable $g_{BL}$ values are found to be much smaller than that in the freeze-out case.

Speaker: Digesh Raut (Washington College)

DR_pheno22_Dirac DM.pdf

35 Constraining Vector Dark Matter with Neutrino experiments

Vector Dark Matter (VDM) that couples to the flavor lepton number ($L_e$, $L_{\mu}$, $L_{\tau}$) acts as a chemical potential for neutrino flavor eigenstates. The effect is strongest on the lighter side of the allowed mass range as the oscillation of the VDM doesn't get averaged over the baseline of the experiment. The resulting modification in neutrino oscillation is within the observational reach of the existing and upcoming neutrino experiments. In particular , we use non-observation of such a signal from Super-Kamiokande and DUNE (proposed) experiments to rule out the existence of dark matter in a region of parameter space several orders of magnitude beyond other current constraints.

Speaker: Saurav Das (Student)

neutrino new.pdf

neutrino new.pptx

Flavor I

Conveners: Sandra Kvedaraite, Sandra Kvedaraite

36 Model-Independent Measurement of Top Quark Mass Using $B$-Hadron Decay Lengths (Part I)

We propose a technique to measure the top quark mass using $B$-hadron decay lengths extracted from $ t \bar{t}$ events. When the top quark is produced unpolarized with an arbitrary boost distribution, the peak of the $b$ quark's energy distribution is identical to its single-valued energy in the rest frame of the top quark. The peak energy is a function of the top quark's mass and the mass of the other decay product, the $W$ boson, measured independently. This measurement of the top mass using the energy peak idea is less sensitive to the production mechanism of the top quark. The original proposal, implemented by the CMS collaboration, used $b$-jet energy as an approximation to the $b$ quark energy. However, $b$-jet energies suffer from the jet energy scale (JES) uncertainty. Instead, we propose using the $B$-hadron decay length as a proxy for the $b$ quark energy. We then merge the two ideas: use $B$-hadron decay lengths to obtain the $b$ quark energy distribution, whose peak determines the mass of the top quark. This measurement would be free of JES uncertainty and insensitive to top quark production. We implement this proposal using Monte Carlo generated data via MadGraph5 and parton showering via Pythia8 and compare our results to a SM-dependent measurement using transverse $B$-hadron decay lengths, a technique used by CMS.

Speaker: Deepak Sathyan

Pheno 2022 Deepak Sathyan.pdf

37 Model Independent Measurement of Top Quark Mass using $B$-Hadron Decay Lengths (Part II)

We discuss the implementation of the newly proposed method to measure top quark mass using B hadron decay lengths. This method is based on the energy peak idea, and implemented by CMS [CMS PAS TOP-15-002]. Instead of using $b$ jet energies, the new method uses $B$-hadron decay lengths, and hence not festered by JES uncertainty. The proposed method also improves upon previous technique to measure top quark mass using transverse $B$-hadron decay lengths in $t \bar{t}$ events [CMS PAS TOP-12-030] by being insensitive to the details of top quark production mechanism. This leads to a significant reduction in uncertainty associated with modeling of top quark transverse momentum spectrum, which is the largest source of uncertainty in measurement using transverse lengths. We verify this claim on Monte Carlo data generated using MadGraph5 and Pythia8.

Speaker: Sagar Airen

Top Mass measurement using B-hadron decay lengths.pdf

38 $K\to \mu^+ \mu^-$ as a clean probe of short distance physics

The $K \to \mu^+ \mu^-$ decay is often considered to be uninformative of fundamental theory parameters since the decay is polluted by long-distance hadronic effects. We demonstrate that, using very mild assumptions and utilizing time-dependent interference effects, $ \mathcal{B} (K_S \to \mu^+ \mu^-)_{ℓ=0}$ can be experimentally determined without the need to separate the $\ell=0$ and $\ell=1$ final states. This quantity is very clean theoretically and can be used to test the Standard Model. In particular, it can be used to extract the CKM matrix element combination $|V_{ts}V_{td}\sin(\beta+\beta_s)|≈|A^2 \lambda^5 \bar{\eta}|$ with hadronic uncertainties below 1%. Additionally, simple New Physics models can significantly enhance $ \mathcal{B} (K_S \to \mu^+ \mu^-)_{ℓ=0}$, making this mode a very promising probe of physics beyond the standard model in the kaon sector. Based on arXiv:2104.06427.

Speaker: Mitrajyoti Ghosh (Cornell University)

Ktomumu_Pheno2022_220509_144025.pdf

Ktomumu_Pheno2022.pdf

39 Forecasting dark showers at Belle II

Dark showers from strongly interacting dark sectors that confine at the GeV scale can give rise to novel signatures at electron-positron colliders. In my talk, I will discuss the sensitivity of B factory experiments to dark showers produced through an effective interaction arising from a heavy off-shell mediator. I will show that a prospective search for displaced vertices at Belle II can improve the sensitivity to dark showers substantially compared to existing searches for GeV-scale long-lived particles, promptly produced resonances or single photons. Moreover, I will argue that a search for light long-lived particles at LHCb can resolve the underlying structure of the effective interaction and highlight the complementarity of LHC and intensity frontier experiments.

Speaker: Elias Bernreuther (Fermilab)

pheno22.pdf

40 Search for New Two-Body Decays of $B$ Mesons to $\Omega_c \Lambda$ with Belle

We search for the SM decays $\bar{B}^{0} \to \bar{\Lambda}^{0} \Omega_{c}^{0}$ and $\bar{B}^{0} \to \bar{\Lambda}^{0} \Omega_{c}(2770)^{0}$, and BSM decays $\bar{B}^{0} \to \bar{\Lambda}^{0}\bar{\Omega}_{c}^{0}$ and $\bar{B}^{0} \to \bar{\Lambda}^{0}\bar{\Omega}_{c}(2770)^{0}$ using the full Belle data sample of 711~${\rm fb^{-1}}$ that contains 772 million $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at KEKB asymmetric-energy electron-positron collider. The former two non-factorizable $W$-emission decays are suppressed in the Standard Model, could be used to understand the predictions of QCD-inspired models and, when discovered, would become a useful tool to search for baryon-antibaryon oscillations, therefore helping to explain matter-antimatter asymmetry. The observation of the latter two final states would either indicate an SM decay followed by baryon-antibaryon oscillations or be the result of a direct BSM transition.

Speaker: Mark Farino (University of Pittsburgh)

Mark_Farino_PHENO-2022_final.pdf

41 Search for Charmed Baryon-Antibaryon Oscillations and BNV with Belle

We report on the first search for baryon-number-violating decay $B^- \to \bar{\Xi}_c^0 \Lambda_c^-$ using data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The results are also interpreted in terms of the previously-discovered Standard Model decay $B^- \to \Xi_c^0 \Lambda_c^-$ followed by possible $\Xi_c^0-\bar{\Xi}_c^0$ oscillations. The measurements of charmed baryons-antibaryon oscillations in the heavy quark sector provide a new avenue to investigate the origin of matter-antimatter asymmetry of the universe.

Speaker: Tianping Gu (University of Pittsburgh)

Tianping_PHENO2022.pdf

42 The forward-backward asymmetry in inclusive semileptonic B decays

The forward-backward asymmetry $\mathcal{A}_\mathrm{FB}$ in inclusive $B\rightarrow X l \nu$ decays is an observable with great potential to improve inclusive determinations of $|V_{cb}|$ and to test lepton flavor universality in tree-level charged current decays. In this talk we discuss the advantages of measuring $\mathcal{A}_\mathrm{FB}$ at Belle II employing a cut on the invariant mass of the lepton-neutrino system instead of commonly used cuts on the lepton energies and highlight the impact of particle identification requirements on the interpretation of future determinations of $\mathcal{A}_\mathrm{FB}$.

Speaker: Florian Herren (Fermilab)

herren_pheno2022.pdf

Higgs I

Convener: Pierre-Hugues Beauchemin (Tufts University (US))

43 Measurement of Higgs boson differential and fiducial cross sections with the ATLAS detector

With the pp collision dataset collected at 13 TeV, detailed measurements of Higgs boson properties can be performed. The Higgs kinematic properties can be measured with increasing granularity, and interpreted to constrain beyond-the-Standard-Model phenomena. This talk presents the measurements of Higgs boson differential and fiducial cross sections with various decay modes, as well as their combination and interpretations.

Speaker: Benedict Tobias Winter (Albert Ludwigs Universitaet Freiburg (DE))

talk.pdf

44 Search for rare and exotic decays of the Higgs boson in ATLAS

The study of the Higgs boson properties provides a unique window for the discovery of new physics at the LHC. New phenomena can in particular be revealed in the search for rare, lepton-flavor-violating or exotic decays of the Higgs boson, as well as in its possible couplings to hidden-sector states that do not interact under Standard Model gauge transformations. This talk presents recent searches by the ATLAS experiment for rare decays of the Higgs boson where enhanced rates would be a sign of new physics, and searches for decays of the Higgs boson to new particles, using collision data at sqrt(s) = 13 TeV collected during the LHC Run 2.

Speaker: Jay Chan (University of Wisconsin Madison (US))

Pheno2022.pdf

45 The depleted Higgs boson: searches for universal coupling suppression, invisible decays, and mixed-in scalars

There are two simple ways that the standard signals of the Standard Model Higgs boson can be depleted. Its couplings to fermions and gauge bosons can be suppressed by a universal factor, and part of its branching fraction can be drained into invisible final states. A large class of theories can impose one or both of these depletion factors, even if mild, by way of additional scalar bosons that are singlets under the Standard Model but mix with the Higgs boson. We perform a comprehensive survey of the present status of the depleted Higgs boson, and discuss future prospects for detecting the presence of either depletion factor. We also survey the constraints status and future detection prospects for the generic case of extra mixed-in scalars which generically lead to these depletion factors for the Higgs boson. We find, for example, that precision study of the Higgs boson in many cases is more powerful than searches for the extra scalar states, given the slate of next-generation experiments that are on the horizon.

Speaker: Prudhvi Bhattiprolu (University of Michigan)

pbhattiprolu.pdf

46 Electroweak phase transition in the 2HDM: collider and gravitational wave complementarity

The knowledge of the Higgs potential is crucial for understanding the origin of mass and thermal history of our universe. We show how collider measurements and observations of stochastic gravitational wave signals can complement each other to explore the multiform scalar potential in the 2HDM. Accounting for theoretical and current experimental constraints, we analyze the key ingredients in the shape of the Higgs potential triggering the transmutation in phase transition, from the smooth cross-over to the strong first-order phase transition ($\xi_c>1$), focusing on the barrier formation and the upliftment of the true vacuum. In particular, we observe that $\xi_c>1$ regime is favored for lower scalar masses, rendering strong extra motivation for collider searches. We contrast the dominant collider signals at the HL-LHC with observable gravitational wave signals at LISA. We obtain that the HL-LHC will be able to cover a vast range of the $\xi_c>1$ parameter space, with scalar decays to heavy fermions $(H,A,H^\pm\to tt, tb)$ being the most promising smoking gun signature of strong first-order electroweak phase transition in the 2HDM.

Speaker: Ajay Kaladharan

Ajay_Pheno_2022.pdf

47 Higgs bosons with large couplings to up-type quarks

We present an analysis of Two Higgs Doublet Models with an extended flavor sector realizing Spontaneous Flavor Violation. In this framework, flavor changing neutral currents are suppressed by powers of CKM matrix elements and Yukawa insertions, allowing the New Physics states to be closer to the energy reach of current colliders. Breaking away from the New Physics paradigm that dictates preferential couplings to the heavier, third generation particles, we see that it is possible to have large couplings to light quarks within this construction. Specifically, we study the bounds on dimension 6 effective operators arising in an Effective Field Theory for this class of models. We find that new couplings of order $\sim 1$ are allowed for $m \sim 100 \hphantom{.} \text{GeV}$ of new Higgs states. Our results are relevant considering recent experimental bounds on the charm quark Yukawa coupling modifier $\vert \kappa_c \vert$. In addition, they strongly motivate dedicated experimental searches for deviations from the Standard Model in the light quark sector.

Speaker: Artemis Sofia Giannakopoulou (C.N Yang Institute for Theoretical Physics, Stony Brook University)

Pheno_2022_Presentation.pdf

48 Measurements of Higgs-fermion interactions at CMS

This talk will cover recent measurements of Higgs boson decays to fermions, including H->cc, H->mumu and other rare modes, and measurements of the top-H coupling including CP measurements.

Speaker: Nick Smith (Fermi National Accelerator Lab. (US))

ncsmith-pheno22-higgsfermion-v3.pdf

49 Measurements of the Higgs boson properties and their interpretations with the ATLAS experiment

With the full Run 2 pp collision dataset collected at 13 TeV, very detailed measurements of Higgs boson properties and its interactions can be performed using its decays into bosons and fermions, shining light over the electroweak symmetry breaking mechanism. This talk presents the latest measurements of the Higgs boson properties by the ATLAS experiment in various decay channels, including production mode cross sections, simplified template cross sections, as well as their combination and interpretations. Specific scenarios of physics beyond the Standard Model are tested, as well as a generic extension in the framework of the Standard Model Effective Field Theory.

Speaker: Carolyn Gee (University of California,Santa Cruz (US))

Pheno2022_HiggsProperties_CGee.pdf

Tools I

Convener: Richard Ruiz (Institute of Nuclear Physics (IFJ) PAN)

50 Probing CP-violation and thermal history of our Universe with Higgs physics

Searching for new sources of CPV and uncovering the mechanism behind EWSB are cornerstones of the LHC program and forthcoming experiments, such as FCC and LISA. First, we show how collider measurements and observations of stochastic gravitational-wave signals can complement each other to explore the multiform scalar potential in the 2HDM. The well-motivated 2HDM leads to a rich phase transition, favoring SFOEWPT below the TeV scale, with the smoking gun signature of scalar resonant searches to top pairs. Second, we show the prospects of directly probing CPV in the Higgs-top coupling. In particular, we use machine learning techniques to uplift the analysis from a raw rate to a polarization study.

Speaker: Dorival Gonçalves (Oklahoma State University)

Dorival_Pheno_2022.pdf

51 Deep Neural Networks to Search for BSM Physics at the Fermilab SBN Program

The Fermilab Short Baseline Neutrino (SBN) program offers excellent opportunity for new physics searches due to its high intensity of protons on target and the exceptional particle identification and reconstruction capabilities of Liquid Argon Time Projection Chambers (LArTPCs). One such example is the demonstrated sensitivity of the program’s detectors to dilepton pairs originating from exotic Higgs Portal Scalar decays. Columnated showers that come from scalar decays to electron/positron pairs can easily be mistaken for photon pair production or single showers by traditional reconstruction algorithms. In this work, Geant4 is used to generate the distribution of charge deposited by signal events within a box of $^\text{40}{\text{Ar}}$. We apply projections to create two dimensional images of each event similar to those captured by distinct wire planes in operating detectors. We then harness the power of deep neural networks to distinguish images of signal and background events for the Higgs Portal Scalar model at the SBN program, improving upon the projected sensitivity from cut-and-count techniques by 30% in $\sin \theta$ for the benchmark scalar mass of 10 MeV.

Speaker: Jamie Dyer

Pheno_Dyer_220508.pdf

52 Azimuthal Angular Correlation as a New Boosted Top Jet Substructure

We propose a novel jet substructure observable of boosted tops that is related to the linear polarization of the W boson in boosted top quark decay, which results in a cos 2φ angular correlation between the t → bW and W → ff′ decay planes. The degree of this angular correlation can be used to measure the longitudinal polarization of a boosted top quark, which is an important probe of new physics that couples to top sector. We show that the unique cos 2φ angular correlation only exists in the boosted regime, but not in the top quark rest frame, and can discriminate a boosted top quark jet from its background events, such as QCD jets.

Speaker: Zhite Yu

Pheno2022_ZhiteYu_boosted_top.pdf

53 Modeling Hadronization using Machine Learning

In this talk, I will present the first steps in the development of a new class of Hadronization Models utilizing machine learning techniques. We successfully implement, validate, and train a conditional sliced-Wasserstein autoencoder to replicate the Pythia generated kinematic distributions of first-hadron emissions when the Lund string model of hadronization implemented in Pythia is restricted to the emissions of pions only. The trained models are then used to generate the full hadronization chains, with an IR cutoff energy imposed externally. The hadron multiplicities and cumulative kinematic distributions are shown to match the Pythia generated ones. I will also discuss possible future generalizations of our results.

Speaker: Ahmed Youssef

Ahmed_pheno_2022.pdf

54 Constraining CP-violation in the Higgs-top-quark interaction using machine-learning-based inference

While CP violation in the Higgs interactions with massive vector boson is already tightly constrained, the CP nature of the Higgs interactions with fermions is far less constrained. In this talk, we assess the potential of machine-learning-based inference methods to constrain CP violation in the Higgs top-Yukawa coupling. This approach enables the use of the full available kinematic information. Concentrating on top-associated Higgs production with the Higgs decaying to two photons, we derive expected exclusion bounds for the LHC and the high-luminosity phase of the LHC. We also study the dependence of these bounds on the Higgs interaction with massive vector bosons and their robustness against theoretical uncertainties. In addition to deriving expected exclusion bounds, we discuss at which level a non-zero CP-violating top-Yukawa coupling can be distinguished from the SM. Moreover, we analyze which kinematic distributions are most sensitive to a CP-violating top-Yukawa coupling.

Speaker: Henning Bahl

2022_05_09_Pheno_Henning_Bahl.pdf

55 Generative Networks for Precision Enthusiasts

Generative networks are opening new avenues in fast event generation for the LHC. We show how generative flow networks can reach percent-level precision for kinematic distributions, how they can be trained jointly with a discriminator, and how this discriminator improves the generation. Our joint training relies on a novel coupling of the two networks which does not require a Nash equilibrium. We then estimate the generation uncertainties through a Bayesian network setup and through conditional data augmentation, while the discriminator ensures that there are no systematic inconsistencies compared to the training data.

Speaker: Theo Heimel (Heidelberg University)

theo_heimel_pheno_precision_enthusiasts.pdf

56 Symmetries, Safety, and Self-Supervision

Collider searches face the challenge of defining a representation of high-dimensional data such that physical symmetries are manifest, the discriminating features are retained, and the choice of representation is new-physics agnostic. We introduce JetCLR to solve the mapping from low-level data to optimized observables though self-supervised contrastive learning. As an example, we construct a data representation for top and QCD jets using a permutation-invariant transformer-encoder network and visualize its symmetry properties. We compare the JetCLR representation with alternative representations using linear classifier tests.

Speaker: Barry Dillon (University of Heidelberg)

pheno2022-barry-dillon.pdf

BSM II

Convener: Joel Walker (Sam Houston State University)

57 Muon EDM in Models with Chiral Enhancement

We study the muon electric dipole moment(EDM) in models with chiral enhancement, in which the long-standing muon g-2 anomaly is easily explained. Examples include the standard model or 2HDM with vectorlike leptons, models with new scalars, and MSSM among others. We find that, for example in 2HDM, the muon EDM can be as large as $\mathcal{O}(10^{-20}) |e|cm$ while all couplings and masses satisfy perturbativity limits and experimental constraints. We emphasize that three observables, muon g-2, muon EDM, and higgs to mu mu, are correlated and show that the muon EDM can be predicted once muon g-2 and higgs to mu mu are precisely measured.

Speaker: Sangsik Yoon (Indiana University)

Sangsik_Yoon_Pheno22_talk.pdf

58 Muon Magnetic Moment-Mass Conundrum and the Scale of New Physics

Recent precise measurement of muon anomalous magnetic moment by the Fermilab experiment reaffirms the Brookhaven measurement and point towards physics beyond the Standard Model. Such a new physics interpretation of the muon $g-2$ anomaly typically leads to large corrections to the muon mass. In this work, we study the constraints imposed by these muon mass corrections on the scale of new physics interpretation of muon $g-2$ anomaly.

Speaker: vishnupk Padmanabhan Kovilakam

gm2_ScaleNP_Pheno_2022.pdf

59 Chirally-Enhanced Muon g-2 and Its Implications to Higgs-Related Observables

I introduce extensions of the Standard Model and a two-Higgs-doublet model with vectorlike leptons which generate chirally-enhanced contributions to the muon's anomalous magnetic moment, $(g-2)_{\mu}$. I show an additional $\tan^2\beta$ enhancement in the Higgs sector can generate up to two-orders of magnitude larger contributions to the magnetic moment while satisfying relavant constraints. These enhanced contributions can clearly explain the anomaly within $1\sigma$ for new lepton and Higgs masses up to tens of TeV, despite this heavy scale being currently unreachable at the LHC. Finally, I demonstrate a connection between a single parameter and $(g-2)_{\mu}$, $h \rightarrow \mu^{+} \mu^{-}$, $\mu^{+} \mu^{-} \rightarrow h h$ and $\mu^{+} \mu^{-} \rightarrow h h h$ observables, suggesting that $(g-2)_{\mu}$ can uniquely determine these Higgs-related processes.

Speaker: Keith Hermanek

Hermanek_PHENO_talk.pdf

60 Muon g-2, Neutralino Dark Matter and Stau NLSP

We explore the implications of resolving the muon $g-2$ anomaly in a $SU(4)_c \times SU(2)_L \times SU(2)_R$ model, where the soft supersymmetry breaking scalar and gaugino masses break the left-right (LR) symmetry. A 2 $\sigma$ resolution of the anomaly requires relatively light sleptons, chargino and LSP neutralino. The stau turns out to be the NLSP of mass $m_{\tilde{\tau}}$ <~ 400 GeV, and the sleptons from the first two families can be as heavy as about 800 GeV. The chargino is also required to be lighter than about 600 GeV to accommodate the muon $g-2$ solutions consistent with the dark matter relic density constraint. The dominant right-handed nature of the light slepton states suppress the sensitivity of possible signals which can be probed in Run3 experiments at the LHC. We also discuss the impact of accomodating the Higgs boson mass and the vacuum stability of the scalar potential for these solutions. The Higgsinos are heavier than about 4 TeV, and the LSP neutralino has the correct relic density if it is Bino-like. We identify stau-neutralino coannihilation as the dominant mechanism for realizing the desired dark matter relic density, with sneutrino-neutralino coannihiliation playing a minor role. These bino-like dark matter solutions can yield a spin-independent scattering cross-section on the order of $10^{-13}$pb which hopefully, can be expected to be tested in the near future.

Speaker: Amit Tiwari

amit_pheno22_May_9.pdf

61 Resolving discrepancies in anomalous magnetic moment in the Zee model

The Zee model comprises a second Higgs doublet and a charged singlet at electroweak scale and generates Majorana neutrino masses at the one-loop level. The neutral component of the $SU(2)_L$ doublet contributes to the AMM of electron and muon via one- and two-loop corrections. In this work, we explore parameter space in the Zee Model to resolve the long-standing tension of the electron and muon anomalous magnetic moment (AMM) and propose two minimal flavor structures that can explain these anomalies while fitting the neutrino oscillation data and being consistent with experimental constraints.

Speaker: Ritu Dcruz (Oklahoma State University)

Pheno_2022.pdf

62 CP Violating Top Yukawa Coupling at the Future Moun Collider

The collisions of muons, as fundamental particles, offer a relatively clean environment compared to that of hadrons. At the same time, with a mass of over 200 times of an electron/positron, muons enable a combination of high center-of-mass energy with a clean collision environment that is not achieved yet by the current running colliders. Thus, the proposed Muon Collider has explicitly stood out of interest. We present our current results on the investigation of the top-quark and Higgs-boson coupling, which is not well constrained according to the most updated experiments, at a future Muon Collider. In this presentation, we talk about the pros & cons of Muon Colliders and the analysis of the signals, $tth$, $tth\nu\nu$, and $tbh\mu\nu$, with various energies in both the Standard Model and CP-Violation Model.

Speaker: Yanzhe Zhang (University of Kansas)

Pheno 2022.pdf

63 CP Structure of the Top Yukawa at a Multi TeV Muon Collider

CP Violation was first discovered in the weak interaction in the 1960s. Since its discovery, efforts have been made to find new sources of CP Violation to account for matter antimatter asymmetry. This project proposes a search for CP Violation in the top Yukawa interaction through high energy muon collisions. Signal processes include $tth$, $tth\nu\nu$, and $tbh\mu\nu$ decaying semi-leptonically. Cross section dependence of signal processes with $\sqrt{s}$ and cross section dependence with varying CP-phase, $\alpha$, at different benchmark $\sqrt{s}$ are presented. Luminosity required for $5\sigma$ discovery and $2\sigma$ exclusion for different $\alpha$ are shown. Projected bounds on $\alpha$ at 95% CL are shown given the Standard Model case, $\alpha$ = 0, at benchmark $\sqrt{s}$.

Speaker: Morgan Cassidy (University of Washington (US))

Pheno 2022.pdf

64 Probing Neutrinoless Double-Beta Decay in Multiple Isotopes

Next-generation searches for neutrinoless double beta (0νββ) decay plan to make use of several isotopes, including 76Ge, 100Mo, and 136Xe. We explore the effects of observations in multiple isotopes on the joint inference of the standard mass mechanism (light neutrino exchange) and an exotic short-range 0νββ mechanism. We also study the role that uncertainties in the nuclear matrix elements (NMEs) for 0νββ play in multi-isotope measurements. Bayesian sampling of high-dimensional likelihood distributions enables us to take into account the correlated uncertainties between NMEs of different isotopes. As NME uncertainties present a significant obstacle in interpreting searches, we project the reduction in uncertainties needed for robust inference about both standard light neutrino-exchange and exotic New Physics mechanisms for 0νββ. Our framework therefore lays the groundwork necessary to draw meaningful conclusions from combined future data, and demonstrate that both pursuing a multi-isotope experimental suite and developing understanding of the correlations between NMEs will be key for constraining theoretical models after a discovery of 0νββ.

Speaker: Graham Van Goffrier (University College London)

PHENO Slides.pdf

Cosmology II

Convener: Fei Huang (ITP CAS and UC Irvine)

65 Cosmologically Degenerate Fermions

Even in the total absence of thermal kinetic energy, fermionic dark matter must have nonzero momentum due to the Pauli degeneracy pressure. As the fermions were inevitably denser at higher redshifts, a typical fermion may gain a fermi momentum that can exceed its mass. I will talk about the impacts of the transition between nonrelativistic and relativistic behaviour, as revealed by measurements of DNeff and the matter power spectrum. Minimal fermion mass bound will be presented, for a given fraction of the dark matter energy density the fermionic dark matter is occupying. I will also remark on implications for direct detection and suggest models of dark sectors that may give rise to cosmologically degenerate fermions.

Speaker: Ms Ying-Ying Li (Fermilab)

CosmologicallyDegenerateFermion_Pitt.pdf

66 Thermal Friction as a Solution to the Hubble and Large-Scale Structure Tensions

Thermal friction offers a promising solution to the Hubble and the large-scale structure (LSS) tensions. This additional friction acts on a scalar field in the early universe and extracts its energy density into dark radiation, the cumulative effect being similar to that of an early dark energy (EDE) scenario. The dark radiation automatically redshifts at the minimal necessary rate to improve the Hubble tension. On the other hand, the addition of extra radiation to the Universe can improve the LSS tension. We explore this model in light of cosmic microwave background (CMB), baryon acoustic oscillation and supernova data, including the SH0ES H0 measurement and the Dark Energy Survey Y1 data release in our analysis. Our results indicate a preference for the regime where the scalar field converts to dark radiation at very high redshifts, asymptoting effectively to an extra self-interacting radiation species rather than an EDE-like injection. In this limit, thermal friction can ease both the Hubble and the LSS tensions, but not resolve them. We find the source of this preference to be the incompatibility of the CMB data with the linear density perturbations of the dark radiation when injected at redshifts close to matter-radiation equality.

Speaker: Kim Berghaus (Johns Hopkins University)

Berghaus Pheno 22.pdf

67 New developments in the Galactic Center Gamma-Ray Excess

The Galactic center gamma-ray excess (GCE) remains one of the most intriguing discoveries from the Fermi Large Area Telescope (Fermi-LAT) observations. Explanations of the GCE include a new population of millisecond pulsars, or annihilating dark matter. The latter explanation could provide us with the first evidence for dark matter interacts with the Standard Model. Debates over the GCE origin have lasted over a decade. I will report new developments toward solving the puzzle. In the first part of my talk, I will describe how we test the sensitivity of GCE with an updated point source catalog, 4FGL, from the Fermi-LAT collaboration. We find that a population of millisecond pulsars with luminosity function that follows a single-power law, once considered the leading interpretation of the GCE, is not a viable candidate to explain the excess. In the second part, I will describe how we revisit the characteristics of the GCE with a set of newly developed galactic diffuse gamma-ray emission templates, which are calibrated with data from multi-messenger observations. We found the broad properties of the GCE are qualitatively unchanged although its quantitative features appear mildly different than those obtained in previous analyses. In particular, we find a high-energy tail with higher significance than previously reported. This also affects the millisecond pulsar interpretation of the GCE: known millisecond pulsars are incapable of producing this high-energy emission and are therefore disfavored as the sole explanation of the GCE. See arXiv:1911.12369 and 2112.09706 for more details.

Speaker: Yiming Zhong (University of Chicago)

yiming_zhong_pheno22.pdf

68 BBN Constraints on Gravitationally Produced Dark Photons

Dark photons can be gravitationally produced from quantum fluctuations during inflation, and it can be more efficient compared to the freeze-in production. The decay of the dark photons around BBN would inject electromagnetic energy into the plasma and potentially disrupt the successful prediction of light element abundances by BBN. In this talk I will discuss MeV to GeV scale gravitationally produced dark photons decaying into Standard Model particles and constrain the pre-decay abundance imposing limits from BBN. I will show that depending on the Hubble rate at the end of inflation, gravitational production can rule out a much larger portion of the dark photon parameter space compared to the freeze-in production.

Speaker: Moinul Rahat

Pheno2022_Rahat.pdf

69 Finding Evidence for Inflation and the Origin of Galactic Magnetic Fields with CMB Surveys

The origin of the microgauss magnetic fields observed in galaxies is unknown. One scenario is that primordial magnetic fields (PMFs) generated during inflation, larger than 0.1 nanogauss on Mpc scales, were compressed to microgauss strengths in galaxies during structure formation. Thus, detecting such a PMF just after recombination would be evidence of this inflationary origin. We find that CMB-HD measurements of anisotropic birefringence would lower the upper bound on scale-invariant PMFs to 0.072 nanogauss at the 95% CL. If inflationary PMFs exist, CMB-HD would be able to detect them with 3-sigma significance or higher, providing evidence for inflation itself.

Speaker: Sayan Mandal

Slides.pdf

70 Bound on Quantum Gravitational Wave Fluctuations from LIGO

Gravitational wave observations at LIGO are in good agreement with classical predictions, with a residual that does not exhibit any unexplained correlations. In the context of general relativity as an effective quantum theory, gravitational waves have been thought to be in the most classical coherent state, in which quantum fluctuations are far too small to see at LIGO. Alternatively, it is plausible to suppose that gravitational waves may be produced in a more interesting squeezed state, in which quantum fluctuations can be exponentially enhanced by the squeezing parameter, as pointed out in recent work. Computing space and time correlations of a class of squeezed gravitational wave states and taking into account the detector response, a simple comparison to LIGO data puts a bound on the squeezing parameter.

Speaker: Jacob Litterer

gravitonnoiseshort.pdf

71 Cosmological Constraints on First-Order Phase Transitions

First-order phase transitions exist in many models beyond the Standard Model and can generate detectable stochastic gravitational waves for a strong one. Using the cosmological observables in big bang nucleosynthesis and cosmic microwave background, we derive constraints on the phase transition temperature and strength parameter in a model-independent way. For a strong phase transition, we find that the phase transition temperature should be above around 2 MeV for both reheating photon and neutrino cases. For a weak one with a temperature below 1 MeV, the phase transition strength parameter is constrained to be smaller than around 0.1. Implications for using a first-order phase transition to explain the NANOGrav observed gravitational wave signal is also discussed.

Speaker: Mrunal Korwar

Cosmological Constraints on First-Order Phase Transitions.pdf

DM II

Conveners: Christina Gao, Christina Gao

72 The Phonon Background from Gamma Rays in Sub-GeV Dark Matter Detectors

Direct detection experiments looking for a scattering signal have gained sensitivity to dark matter as light as ~MeV. A promising strategy for lowering the threshold to the keV-scale is to look for meV-scale phonons in solid-state targets. Such experiments will however be subject to backgrounds from high-energy photons. Radioactive contaminants can emit gamma rays that can scatter in the target to create meV-scale phonons that could mimic the dark matter signal. In this talk, I will present the computation of this background in typical target materials, using a realistic representation of the high-energy photon background. I will also show the comparison of the background rates with the expected signal rates from dark matter. In the end, I will show that the detector-veto is not enough to completely suppress this background, calling for an additional active-veto.

Speaker: Mukul Sholapurkar

Mukul_Pheno22.pdf

73 Looking for ultraheavy dark matter in geological quartz

The non-observation of the simplest dark matter candidates has motivated searches for a wider range of alternatives. One possibility is self-interactions within the dark sector causing dark matter to clump into heavy composite states. Their corresponding low number density poses a challenge for existing direct detection experiments due to the highly suppressed event rate. In this talk, I discuss the opportunity to use geologically old quartz samples as large-exposure detectors for such ultraheavy dark matter (UHDM). Since UHDM has a large cross section with the standard model, it would leave a long, straight damage track as it passes through and scatters with matter. This is a distinctive and compelling signature for our search. The advantage of our strategy is twofold: the age of the quartz compensates for the low UHDM number density, and the characteristic geometry of the damage track serves as a high-fidelity background rejection tool.

Speaker: Anubhav Mathur (Johns Hopkins University)

Slides.pdf

74 Dark Matter Searches with Integrated Optics

Integrated optical chips containing large numbers of optical micro-resonators provide a powerful method to search for axion and hidden photon dark matter in the mass range 0.1 meV to 5 eV. Such chips have a large effective detector volume with high-finesse photon resonances at the visible and near-IR wavelengths associated with these dark matter masses. Further, they readily allow the use of established optical techniques to kinematically favor dark matter-photon interactions. I will describe a series of such dark matter searches, employing large numbers of microring cavities either in background EM fields or pumped with optical photons, which are sensitive to significant unconstrained parameter space.

Speaker: Ryan Janish (Fermilab)

2022-05-pheno-janish.pdf

75 Inelastic Dipole Dark Matter at FASER

Inelastically coupled dark matter has the well-known advantage of evading direct detection bounds, given a sufficient mass splitting $\Delta$ between 2 dark states, $\chi_1, \chi_0$. One of the simplest couplings one can add to the standard model (with no additional dark states) are the non-renormalizable dipole operators, where $\chi_0,\chi_1$ inelastically couple to the SM photon. This minimal model gives the interesting monophoton decay signature of $\chi_1\rightarrow\chi_0 \gamma$. Furthermore, relic abundance can be achieved via freeze out through t(s)-channel (co-)annihilation. In this talk, I discuss this model, bounds constraining the coupling and mass splittings at existing experiments, and demonstrate FASER's ability to rule out unprobed regions of interesting parameter space.

Speaker: Max Fieg

Pheno 2022_Fieg_final.pdf

76 DarkQuest - Searching for light dark matter at Fermilab's proton fixed-target experiment

Accelerator-based dark matter searches provide a unique opportunity to expand the sensitivity to the sub-GeV mass regime. In this region, there are existing opportunities to search for dark sector signatures, mediators, and the dark matter itself, that are unconstrained. DarkQuest is a proton fixed-target experiment that would use a high-intensity beam of 120 GeV protons to produce dark sector mediators. These mediators will interact feebly with the SM and decay into visible states with displaced lepton, photon, and hadron signals. DarkQuest will exploit the short baseline and compact spectrometer of the current beam dump experiment at Fermilab, SpinQuest, to search for these decays. Since it builds on the existing accelerator and detector infrastructure, it offers a powerful yet low-cost experimental initiative that can be realized on a short timescale. In this talk, we will discuss the current detector design, proposed upgrades, and recent studies on the signal topology and detector acceptance.

Speaker: Yongbin Feng (Fermi National Accelerator Lab. (US))

DQ_Pheno_May9th.pdf

77 New Directions in Direct Detection: Towards the Mesoscale

As the age of WIMP-scale dark matter (DM) draws to a close thanks to the ever-increasing sensitivity of direct detection experiments, the majority of DM parameter space outside of the weak scale remains to be explored. Sub-GeV DM can excite electronic transitions in a variety of molecular and nano-scale systems which have sub-eV scale thresholds. Quantum dots are nanocrystals of semiconducting material whose band-edge electronic properties are determined by their characteristic size. I will discuss the importance of molecular and mesoscopic systems as new directions in the direct detection of dark matter focusing on the use of quantum dots as detector targets. I will show that QDs present a particularly interesting target with inherently low-background signals and low-cost scalability.

Speaker: Carlos Blanco

78 Maximizing Direct Detection with HYPER Dark Matter

We estimate the maximum direct detection cross section for sub-GeV dark matter scattering off nucleons. For dark matter masses in the range of $10 \text{ keV} − 100 \text{ MeV}$, cross sections greater than $10^{−36} - 10^{−30} \text{ cm}^2$ seem implausible. We introduce a dark matter candidate which realizes this maximum cross section: HighlY interactive ParticlE Relics (HYPERs). After HYPERs freeze-in, a dark sector phase transition decreases the mass of the mediator which connects HYPERs to the visible sector. This increases the HYPER's direct detection cross section, but in such a way as to leave the HYPER's abundance unaffected and avoid conflict with measurements of Big Bang Nucleosynthesis and the Cosmic Microwave Background. HYPERs present a benchmark for direct detection experiments in a parameter space with few known dark matter models.

Speaker: Robert McGehee

R McGehee - Maximizing Direct Detection with HYPER DM.pdf

79 Probing Invisible Vector Meson Decays with NA64 and LDMX

Electron beam fixed target experiments such as NA64 and LDMX use missing energy-momentum to detect the production of dark matter and other long-lived states. The most studied production mechanism is dark Bremsstrahlung through a vector mediator. In this talk, we introduce a complementary source of missing energy-momentum signals: Bremsstrahlung photons can convert to hard vector mesons in exclusive photoproduction processes, which then decay to dark matter or other invisible particles, such as neutrinos. We find that existing NA64 data can improve the leading constraints on invisible light vector meson decays, while a future run of LDMX could improve them by up to $5$ orders of magnitude. For the examples of a dark photon and a $U(1)_B$ gauge boson mediator, accounting for meson decays substantially enhances these experiments' sensitivity, especially to thermal relic dark matter of mass above $0.1$ GeV.

Speaker: Kevin Zhou (Stanford University)

Slides.pdf

DM V

Convener: Zhen Liu (University of Minnesota (US))

80 Super-Resonant Dark Matter

In this paper we present Super-Resonant Dark Matter (SRDM), a model of self-interacting dark matter (SIDM) based on the low energy effective theory of supersymmetric QCD. A novel feature of the model is that an s-channel resonance is generated in the non-relativistic limit via a mass ratio fixed by flavor symmetry. One loop corrections shift the mass ratio off resonance and allow SRDM to accommodate small scale anomalies seen in dark matter halos. Fitting to dark matter halo observations also picks out a precise dark matter mass range (mDM ∼ 4−8 MeV) and self interaction coupling; something which is not achieved for many SIDM models with resonant self interactions. The SRDM model can account for all of the dark matter in the universe if it is produced via the freeze-in mechanism with a U(1)D massive dark photon acting as the mediator between the dark sector and the Standard Model (SM). The ease of detection of the dark matter depends on the U(1)D gauge coupling, which in turn determines the annihilation of charged dark matter to neutral dark matter.

Speaker: Andrew Gomes (Cornell University (US))

Pheno20220509.pdf

81 Dark Freeze-out Cogenesis

We propose a new mechanism where a multi-component dark sector generates the observed dark matter abundance and baryon asymmetry and thus addresses the coincidence between the two. The thermal freeze-out of dark matter annihilating into meta-stable dark partners sets the dark matter relic abundance while providing the out-of-equilibrium condition for baryogenesis. The meta-stable state triggers baryon asymmetry production by its decay well after the freeze-out and potentially induces a period of early matter domination before its decay. The dark matter and baryon abundances are related through number conservation within the dark sector (cogenesis). The ``coincidence" is a natural outcome with GeV- to TeV-scale symmetric dark matter and the dark sector's interactions with the Standard Model quarks. We present a UV-complete model and explore its phenomenological predictions, including dark matter direct detection signals, LHC signatures of new massive particles with color charges and long-lived particles with displaced vertices, dark matter-induced nucleon conversions, (exotic) dark matter indirect detection signals, and effects on the cosmological matter power spectrum. As a side result, we provide a novel analytical treatment for dark sector freeze-out, which may prove useful in the study of related scenarios.

Speaker: Michael Shamma (TRIUMF)

DarkFO_Cogenesis.pdf

82 Twin Quark Dark Matter from Cogenesis

A novel dark matter candidate is proposed, arising from spontaneously breaking of the twin color group in the fraternal twin Higgs scenario. A matter/antimatter asymmetry is co-generated in both sectors from the sources of the twin color breaking. A quark that is singlet under the residual twin color group decay into a colorless twin quark and twin lepton, which are consisted of asymmetric dark matter, and provides an additional portal between the visible and twin sectors. This type of dark matter is decaying or kinematically stable, depending on a simple mass relation between the two components. We present current constraints and possible signatures of this model in future experiments as well as the connections between signals in the context of the naturalness, dark matter, and matter/antimatter puzzles.

Speaker: Taewook Youn (University of Texas at Austin)

TY_pheno.pdf

83 Asymmetric Dark Matter May Not Be Light

It is often said that asymmetric dark matter is light compared to typical weakly interacting massive particles. Here we point out a simple scheme with a neutrino portal and $\mathcal{O}(60 \text{ GeV})$ asymmetric dark matter which may be ``added'' to any standard \bs{electroweak} baryogenesis scenario. The dark sector contains a copy of the Standard Model gauge group, as well as (at least) one matter family, Higgs, and right-handed neutrino. After baryogenesis, some lepton asymmetry is transferred to the dark sector through the neutrino portal where dark sphalerons convert it into a dark baryon asymmetry. Dark hadrons form asymmetric dark matter and may be directly detected due to the vector portal. Surprisingly, even dark anti-neutrons may be directly detected if they have a sizeable electric dipole moment. The dark photons visibly decay at current and future experiments which probe complementary parameter space to dark matter direct detection searches. Exotic Higgs decays are excellent signals at future $e^+ e^-$ Higgs factories.

Speaker: Bethany Suter (UC Berkeley)

Asymmetric Dark Matter May Not Be Light.pdf

84 Thermal misalignment of Ultra light Dark Matter

We extend the thermal misalignment paradigm explored previously by my co-authors to include bosonic(Higgs) like degree of freedom in the thermal bath and explore how this will result in a thermally misalignment production of Ultra light dark matter scenarios.

Speaker: Mudit Rai

Thermal misalignment.pdf

85 Conformal Freeze-In and the Dark Photon

We consider a scenario where the SM hypercharge field strength mixes with a rank-2 antisymmetric CFT operator. This mixing enables a freeze-in process in the early universe. At low-energies, the CFT confines; providing a dark sector described by dark "hadrons" which couples to the SM via a kinetically-mixed dark photon.

I will discuss why such a scenario is worth considering, the parameter space that produces the observed dark matter relic density, and the phenomenological constraints on such a model.

Speaker: Wen Han Chiu

Pheno.pdf

86 A Dark Matter WIMP That Can Be Detected and Definitively Identified with Currently Planned Experiments

We have proposed a dark matter candidate which is consistent with all current experiments, and observable in the near or foreseeable future through a wide variety of direct, indirect, and collider detection experiments [1,2]. This particle is unique in that it has (i) precisely defined couplings and (ii) a well-defined mass of about 72 GeV/c$^2$, providing specific cross-sections and other experimental signatures as targets for clean experimental tests. It has not yet been detected because it has no interactions other than second-order gauge couplings, to $W$ and $Z$ bosons. However, these weak couplings are still sufficient to enable observation by direct detection experiments which should be fully functional within the next few years, including XENONnT, LZ, and PandaX. The cross-section for collider detection at LHC energies is small -- roughly 1 femtobarn -- but observation may ultimately be achievable at the high-luminosity LHC, and should certainly be within reach of the even more powerful colliders now being planned. It is possible that the present dark matter candidate has already been observed via indirect detection: Several analyses of gamma rays from the Galactic center, observed by Fermi-LAT, and of antiprotons, observed by AMS-02, have shown consistency with the interpretation that these result from annihilation of dark matter particles having approximately the same mass and annihilation cross-section as the present candidate. Finally, there is consistency with the observations of Planck, which have ruled out many possible candidates with larger masses. The present theory also requires supersymmetry at some energy scale [3], and the lightest supersymmetric particle (as a subdominant component) can stably coexist with the present dark matter candidate.

[1] Reagan Thornberry, Maxwell Throm, Gabriel Frohaug, John Killough, Dylan Blend, Michael Erickson, Brian Sun, Brett Bays, and Roland E. Allen. “Experimental signatures of a new dark matter WIMP”, EPL (Europhysics Letters) 134, 49001 (2021), arXiv:2104.11715 [hep-ph].
[2] Caden LaFontaine, Bailey Tallman, Spencer Ellis, Trevor Croteau, Brandon Torres, Sabrina Hernandez, Diego Cristancho Guerrero, Jessica Jaksik, Drue Lubanski, and Roland E. Allen, “A Dark Matter WIMP That Can Be Detected and Definitively Identified with Currently Planned Experiments”, Universe 7, 270 (2021), arXiv:2107.14390 [hep-ph].
[3] Roland E. Allen, “Predictions of a fundamental statistical picture”, arXiv:1101.0586 [hep-th].

Speaker: Roland Allen

Allen-PHENO-2022.pdf

87 Primordial Black Hole Dark Matter in the Context of Extra Dimensions

The addition of spatial dimensions compactified to submillimeter scales serves as an elegant solution to the hierarchy problem. As a consequence of such large extra dimensions, is the possibility of producing primordial black holes (PBHs) from high-energy collisions in the early universe, leading to a novel source of dark matter. While four-dimensional PBHs have been extensively studied, they have received little attention in the context of extra dimensions. We derive the full cosmological history including creation and evolution of these PBHs, adapting and extending previous analyses of four-dimensional PBHs. We combine constraints from Big Bang Nucleosynthesis, the Cosmic Microwave Background, the Cosmic X-ray Background, and galactic centre gamma-rays. In addition to finding strong constraints on a large portion of available parameter space, we find that in the case of two extra dimensions, asteroid-mass (~ $10^{20}$ g) black holes could be created in the early universe and survive until today, potentially comprising the entirety of the observed dark matter abundance.

Speaker: Avi Friedlander (Queen's University)

PHENO 2022.pdf

Neutrinos I

Convener: Shirley Li (Fermilab)

88 Probing light Dirac neutrino portal Dark Matter via CMB observations

We propose a light Dirac neutrino portal dark matter (DM) scenario by minimally extending the particle content of the standard model (SM) with three right handed neutrinos ($\nu_R$), a Dirac fermion DM candidate ($\psi$) and a complex scalar ($\phi$), all of which are singlets under the SM gauge group. An additional $Z_4$ symmetry has been introduced for the stability of DM candidate $\psi$ and also ensuring the Dirac nature of light neutrinos at the same time. Depending upon the strength of couplings involving these particles, one can have either thermal or non-thermal production of DM. Since the same interaction produces DM as well as relativistic $\nu_R$ leading to enhanced effective relativistic degrees of freedom $N_{\rm eff}$, the DM parameter space gets tightly constrained by Planck 2018 data. The next generation CMB experiments like CMB-S4, SPT-3G etc. will have the required sensitivities to probe most of the parameter space of this minimal scenario, which other experiments like direct detection are not much sensitive to.

Speaker: Dr Debasish Borah (Indian Institute of Technology Guwahati)

PHENO_dborah.pdf

89 Exploring Strange Origin of Dirac Neutrino Masses at Hadron Colliders

We consider the possibility that Dirac neutrino masses may be a manifestation of chiral symmetry breaking via non-perturbative QCD dynamics. Due to the key role of light quarks in this mechanism, this can naturally lead to signals that are accessible to hadron colliders. Bounds from charged meson decays imply that the strange quark condensate leads to the dominant effect. We propose a model with an extra Higgs doublet at the TeV scale with significant coupling to strange quarks and leptons, leading to Dirac neutrino mass generation. Current data on $D-\bar{D}$ mixing places constraints on the allowed parameter space of the model, with a 100 TeV $pp$ collider being capable of either discovering or excluding much of it.

Speaker: Dr Matthew Sullivan (Brookhaven National Laboratory)

strangenu.pdf

90 Dimuons in Neutrino Telescopes: New Predictions and First Search in IceCube

Neutrino telescopes allow powerful probes of high-energy astrophysics and particle physics. Their power is increased when they can isolate different event classes, e.g., by flavor, though that is not the only possibility. Here we focus on a new event class for neutrino telescopes: dimuons, two energetic muons from one neutrino interaction. We make new theoretical and observational contributions. For the theoretical part, we calculate dimuon production cross sections and detection prospects via deep-inelastic scattering (DIS; where we greatly improve upon prior work) and W-boson production (WBP; where we present first results). We show that IceCube should have ≃400 dimuons (≃8 from WBP) in its current data and that IceCube-Gen2, with a higher threshold but a larger exposure, could detect ≃1200 dimuons (≃30 from WBP) in 10 years. These dimuons are almost all produced by atmospheric neutrinos. For the observational part, we perform a simple but conservative analysis of IceCube public data, finding 19 candidate dimuon events. Subsequent to our paper appearing, visual inspection of these events by the IceCube Collaboration reveals that they are not real dimuons, but instead arise from an internal reconstruction error that identifies some single muons crossing the dust layer as two separate muons. To help IceCube and the broader community with future dimuon searches, we include the updated full details of our analysis. Together, these theoretical and observational contributions help open a valuable new direction for neutrino telescopes, one especially important for probing high-energy QCD and new physics.

Speaker: Bei Zhou (Johns Hopkins University)

20220509 Pheno, dimu, (Bei Zhou).pdf

91 Neutrinos from the LHC: Neutral Current Measurements and Electromagnetic Properties at the FPF

The significant neutrino flux at high rapidity (far forward direction) at the LHC has so far gone unstudied and wasted. The proposed Forward Physics Facility (FPF) aims to redress this by having dedicated detectors to study neutrinos at TeV energies. In this talk I will present some phenomenological studies in this direction. i) Charged current neutrino interactions have been extensively studied in the context of various experiments. The presence of a charged lepton in the final state allows for easy identification of candidate signal events and incoming beam energy reconstruction. Neutral current neutrino interactions on the other hand have a neutrino in the final state making signal vs background differentiation, and energy reconstruction much more difficult. We present a technique using machine learning tools to overcome these difficulties and constrain NC cross-section in 100 GeV - a few TeV range. We can convert this sensitivity to limits on neutrino NSI. ii) The electromagnetic properties of neutrinos (magnetic moments, milli-charge, charge radius) have attracted significant interest recently. We make use of the enhanced neutrino flux expected in the HL-LHC era along with the sophisticated detectors at the FPF to constrain these properties. If a new sterile state exists that couple to SM neutrino via the photon through a dipole portal, then it will also leave a signature in these detectors via up-scattering. This allows us to constrain the magnetic dipole moment interaction between SM neutrinos and this new sterile state.

Speaker: Roshan Mammen Abraham (Oklahoma State University)

roshan_pheno2022.pdf

92 Towards probing the diffuse supernova neutrino background in all flavors

To fully understand the whole core-collapse supernova population, it is essential to observe neutrinos from multiple supernovae events - the diffuse supernova neutrino background (DSNB). The Super-Kamiokande (SK) detector achieved the most stringent upper limit on the electron antineutrino component of the DSNB. This limit is only a factor of 2-3 above most of the theoretical predictions. In addition, SK is now enriched with gadolinium which will help to reduce backgrounds for the DSNB search and most probably lead to the detection within the near future. The electron neutrino component of the DSNB has a ten times weaker upper limit than the electron antineutrino component. The limit may change into observation with the upcoming Deep Underground Neutrino Experiment (DUNE). But capturing the complete picture of the core-collapse supernova landscape and investigating new astrophysics or physics requires probing DSNB in all flavors. The upper limits on the non-electron component of the DSNB (muon and tau neutrinos and antineutrinos) are ~ a thousand times weaker than the theoretical predictions. In this talk, I will present how the large-scale direct dark matter detectors can help significantly tighten the upper limits on the non-electron component of DSNB. In addition, I will talk about plausible beyond the Standard Model scenarios, which could alter the non-electron neutrino emission from the core-collapse supernovae.

Speaker: Anna M. Suliga (UC Berkeley and U. of Wisconsin)

Suliga.pdf

Towards Probing the Diffuse Supernova Neutrino Background in All Flavors

93 Chiral gauge theories connecting Dark matter and neutrinos

We carry out a systematic investigation for minimal scotogenic models based
on a dark $U(1)_D$ gauge symmetry, in which the neutrino masses are induced at the one-loop level and include a chiral dark matter(DM) candidate. Moreover, we assume this $U(1)_D$ gauge symmetry is broken by only one Higgs singlet scalar that also generates masses to all dark fermions. The stability of the DM candidate is ensured by a residual symmetry of $U(1)_D$ symmetry. We study a complete theory with chiral $U(1)_D$ with various possible dark matter scenarios and explore the associated DM phenomenology for these feasible cases (scalar DM (singlet-doublet mixture), Majorana/Dirac DM) consistent with the current experimental bounds.

Speaker: Shreyashi Chakdar

Pheno22_chakdar.pptx

94 From Zero to Hero... to Zero? 0νββ-decay, energy frontier probes, and the origin of matter

Lepton number violation (LNV) is a very attractive research topic for theoretical and experimental physicists due to its implications beyond the Standard Model. It provides feasible theoretical explanations to several open questions in particle physics (e.g., the origin of neutrino mass) and has a rich phenomenology at different energy scales. We explore the underlying connections between neutrinoless double 𝛽−decay (0𝜈𝛽𝛽) experiments, hadron colliders, and cosmology observations. In the context of simplified models, we show that future collider and 0𝜈𝛽𝛽 experimental results may complement each other.

Speaker: Sebastian Urrutia-Quiroga (University of Massachusetts Amherst)

Pheno2022_suq_lnv.pdf

TeV-scale Lepton Number Violation: Connecting Leptogenesis, Neutrinoless Double Beta Decay, and Colliders

95 Probing the neutrinophilic Z' at the DUNE near detector

Hidden U(1) symmetries in the right-handed neutrino ($\nu_R$) sector are theoretically well-motivated and would give rise to an inherently dark gauge boson which we refer to as the $\nu_R$-philic Z'. An important feature of this Z' is that its couplings to neutrinos are generally much larger than its couplings to charged leptons and quarks, providing a particularly interesting scenario for future neutrino experiments such as DUNE to probe. In this talk, I'll discuss two approaches to probe this Z' at DUNE near detectors via (i) searching for Z' decay signals and (ii) precision measurement of elastic neutrino-electron (ν-e) scattering. I will show that the former will have sensitivity comparable to or better than previous beam dump experiments while the latter will improve current limits substantially for large neutrino couplings.

Speaker: Garv Chauhan (UCLouvain)

Chauhan_PHENO22.pdf

QCD&EW I

Convener: John Allison

96 Systematics of U-spin Amplitude Sum Rules

The main challenge in probing weak interactions comes from non-perturbative QCD effects. In our work we use U-spin symmetry, an approximate $SU(2)$ symmetry of the QCD Lagrangian under unitary rotation of down and strange quarks, to derive algebraic relations between decay amplitudes when exact calculations are not possible. Such relations between amplitudes are called U-spin sum rules. We systematically study U-spin sum rules and find a rich mathematical structure that underlines them. We prove several general properties and show the universality of sum rules. The understanding that we gain from our analysis allows us to derive sum rules to any order of symmetry breaking without explicitly calculating the Clebsch-Gordan coefficient tables as is done in the standard approach to U-spin sum rules. We do this via constructing a multi-dimensional lattice where each node represents an amplitude. The sum rules are read off the lattice. The multidimensional lattice is reduced to a simple diagrammatic approach for many practical cases that we consider. We provide several examples that demonstrate how to apply our general results to systems that can be probed experimentally.

Speaker: Margarita Gavrilova (Cornell)

Systematics of U-spin Amplitude sum rules.pdf

97 Higher-Order Electroweak Contributions to Indirect CP Violation

The parameter $\epsilon_K$ is an important measure of the imbalance between matter and antimatter in the neutral kaon ($K^0$ and $\bar{K}^0$) system. In particular, $\epsilon_K$ provides a highly sensitive probe of new physics and plays a critical role in the global fit of the Cabibbo-Kobayashi-Maskawa matrix. As one of the first discovered sources of $CP$ violation, it has been extensively measured in experiment to per-mil precision. The theoretical calculation of $\epsilon_K$, however, has historically been plagued by large perturbative errors arising from charm-quark corrections. These errors were larger than the expected magnitude of higher-order electroweak corrections in perturbation theory, rendering these contributions irrelevant. Recently, it was discovered that a simple re-parameterization of the effective Hamiltonian drastically reduces perturbative errors, making these higher-order electroweak calculations worth-while. We present the next-to-leading-logarithm electroweak contributions to $\epsilon_K$.

Speaker: Zachary Polonsky (University of Cincinnati)

zp_pheno22.pdf

98 Electroweak Higgs Boson Production with Precision

In this talk I will present results of the simulation of electroweak Higgs boson production using both NLO multi-jet merging and NLO matching frameworks provided by the general purpose event generator Herwig 7 using the matrix element providers HJets and VBFNLO for the full one-loop corrections and the approximate one-loop corrections.

Speaker: Terrance Figy (Wichita State University)

Pheno2022-TFigy.pdf

Pheno2022-TFigy.pptx

99 Optimal Transport for Jet Physics

Optimal Transport (OT) has been applied to jet physics in defining a notion of the distance between collider events. Here we generalize the Energy Mover’s Distance to a larger space of OT distances, including both the balanced 2-Wasserstein (W2) distance and the unbalanced Hellinger-Kantorovich (HK) distances. Whereas the W2 distance only allows for mass transportation, the HK distances allow mass to be transported, created and destroyed, thereby naturally incorporating the total pT difference of the jets. Both distances possess a Riemannian structure that lends itself to efficient linearization. We develop the particle linearized unbalanced Optimal Transport (pluOT) framework for collider events based on the linearized W2 and HK distances and demonstrate their respective efficacy in boosted jet tagging. This provides a flexible and computationally efficient framework of OT coupled with simple machine learning methods ideally suited for collider physics applications.

Speaker: Ms Tianji Cai (University of California, Santa Barbara)

Optimal Transport for Jet Physics

Pheno2022 Talk.pdf

100 Precise predictions for massive charm production with a W boson

In my talk I would like to cover our recent phenomenology study
of massive charm production in association with a W boson with NLO
accuracy in QCD at the hadron level. By matching our NLO calculation
to parton shower programs using the POWHEG matching method we were
able to create predictions at the hadron level directly comparable to
experiments. At the LHC this process is extensively studied by both
ATLAS and CMS at 7 and 13 TeV. Our results were compared to experimental
data. The talk would cover the detailed comparison of data to
predictions with emphasis on the associated charm-pair production
with a W boson which also gives a non-vanishing contribution to the yields.

Speaker: Adam Kardos

kardos.pdf

101 On the interference of ggH and cc̄H Higgs production mechanisms and the determination of charm Yukawa coupling at the LHC

Higgs boson production in association with a charm-quark jet proceeds through two different mechanisms – one that involves the charm Yukawa coupling and the other one that involves direct Higgs coupling to gluons. The interference of the two contributions requires a helicity flip and, therefore, cannot be computed with massless charm quarks. In this talk, I will discuss how the NLO QCD corrections to this interference can be computed starting from charm-gluon collisions with massive charm quarks and then taking, carefully, the massless limit. I will discuss how one can resum large logarithms of the charm mass from initial states collinear emissions. Then, I will mention that the necessity of a helicity flip implies unconventional behavior of the QCD cross sections in singular limits. Finally, some results will be presented.

Speaker: Jérémie Quarroz (KIT)

beamer.pdf

102 Searches for new phenomena in final states with 3rd generation quarks using the ATLAS detector

Many theories beyond the Standard Model predict new phenomena, such as heavy vectors or scalar, vector-like quarks, and leptoquarks in final states containing bottom or top quarks. Such final states offer great potential to reduce the Standard Model background, although with significant challenges in reconstructing and identifying the decay products and modelling the remaining background. The recent 13 TeV pp results, along with the associated improvements in identification techniques, will be reported.

Speaker: Paul Philipp Gadow (Deutsches Elektronen-Synchrotron (DE))

PHENO2022-Gadow-ATLAS-3rdGen.pdf

103 Higgs boson decay to $J/\psi$ via $c$-quark fragmentation

With the discovery of the Higgs boson at the CERN Large Hadron Collider (LHC), the particle spectrum of the Standard Model (SM) is complete. The next target at the energy frontier will be to study the Higgs properties and to search for the next scale beyond the SM. Experimentally, the $H\to c \bar{c}$ channel would be extremely difficult to dig out because of both the weak Yukawa coupling and the daunting SM di-jet background. We propose to test the charm-quark Yukawa coupling at the LHC and future hadron colliders with the Higgs boson decay to $J/\psi$ via the charm-quark fragmentation. Using the non-relativistic quantum chromodynamics (NRQCD), we study the Higgs decay channel $ H \to c \ \bar{c} + J/\psi $(or $ \eta_c $), where both the color-singlet and color-octet contributions are considered. Our result opens another door to improve determinations at the LHC of the Higgs Yukawa couplings: the final state from this decay mode is quite distinctive with $J/\psi\to e^+e^-,\, \mu^+\mu^-$ and the branching fraction is logarithmically enhanced by the charm-quark fragmentation mechanism.

Speaker: Yang Ma (University of Pittsburgh)

Pheno2022.pdf

Theory I

Convener: Rudrajit Banerjee (University of Pittsburgh)

104 Cosmological Collider Physics using Primordial Clocks and Clicks

Signatures of the heavy particles produced on-shell during the inflationary era can be imprinted on cosmological correlation functions, thereby offering a unique opportunity to probe particle spectra at energy scales far beyond the energies achievable with any conceivable terrestrial collider. These heavy particle signatures, however, are generally Boltzmann-suppressed, limiting the potential reach of such new physics searches. We show that features in the inflationary landscape can play a major role in extending the energy reach of the program of cosmological collider physics. In a generic framework, we demonstrate that classical features excite unsuppressed quantum modes of heavy fields which leave observational signatures in primordial non-Gaussianities.

Speaker: Reza Ebadi

20220509 CCCP Ebadi.pdf

105 Missing Scalars at the Cosmological Collider

Light scalar fields typically develop spatially varying backgrounds during inflation. Very often they do not directly affect the density perturbations, but interact with other fields that do leave nontrivial signals in primordial perturbations. In this sense they become "missing scalars" at the cosmological collider. We study potentially observable signals of these missing scalars, focusing on a special example where a missing scalar distorts the usual oscillatory features in the squeezed bispectrum. The distortion is also a useful signal distinguishing the de Sitter background induced thermal mass from a constant intrinsic mass.

Speaker: Qianshu Lu

Qianshu_LU.pdf

106 Asymmetric Reheating by Primordial Black Holes

We investigate Hawking evaporation of a population of primordial black holes (PBHs) prior to
Big Bang Nucleosynthesis (BBN) as a mechanism to achieve asymmetric reheating of two sectors
coupled solely by gravity. While the visible sector is reheated by the inflaton or a modulus, the dark
sector is reheated by PBHs. Compared to inflationary or modular reheating of both sectors, there
are two advantages: (i) inflaton or moduli mediated operators that can subsequently thermalize the
dark sector with the visible sector are not relevant to the asymmetric reheating process; (ii) the
mass and abundance of the PBHs provide parametric control of the thermal history of the dark
sector, and in particular the ratio of the temperatures of the two sectors. Asymmetric reheating
with PBHs turns out to have a particularly rich dark sector phenomenology, which we explore using
a single self-interacting real scalar field in the dark sector as a template

Speaker: Barmak Shams Es Haghi (University of Utah)

Pheno2022-Barmak.pdf

107 Kaluza-Klein Portal Matter

In models of thermal dark matter with MeV-GeV masses, a common simplified construction relies on a U(1) dark sector (and corresponding dark photon of MeV-GeV mass) which kinetically mixes with the Standard Model (SM) hypercharge to serve as a mediator to achieve the observed relic abundance. This kinetic mixing will arise at one-loop order if the theory includes so-called "portal matter"-- heavy particles charged under both the dark gauge group and the SM hypercharge. It has been previously argued that if the portal matter is assumed to be fermionic, then phenomenological and theoretical concerns suggest that these portal matter fields will be vector-like copies of SM particles, albeit with additional charge under the dark gauge group, and should have a delicate cancellation of charges such that the resulting kinetic mixing is both finite and calculable. In this talk, we shall argue that extra dimensions present a natural framework in which to realize phenomenologically and theoretically satisfactory fermionic portal matter-- if the dark U(1) gauge group is embedded in a larger Lie group that is broken by boundary conditions on the branes, then portal matter will naturally arise as massive Kaluza-Klein states if SM fermions are embedded in dark multiplets in the bulk. To demonstrate, we present a semi-realistic toy model with a single TeV-scale flat extra dimension, discussing the collider phenomenology of this setup and how the inclusion of a portal matter sector would alter the familiar phenomenological constraints on such 5D theories.

Speaker: GEORGE WOJCIK

George_Wojcik_Pheno_2022.pdf

108 Flavored gauge-mediated supersymmetry breaking models with discrete non-Abelian symmetries

We investigate flavored gauge mediation models in which the Higgs and messenger doublets are embedded in multiplets of the discrete non-Abelian symmetry S3. In these theories, the S3 symmetry correlates the flavor structure of the quark and lepton Yukawa couplings with the structure of the messenger Yukawa couplings that contribute to the soft supersymmetry breaking mass parameters. We provide a systematic exploration of possible scenarios within this framework that can accommodate hierarchical quark and charged lepton masses, and examine the resulting phenomenological implications in each case. We find a heavier spectrum for the superpartner masses compared to flavored gauge mediation models controlled by Abelian symmetries, which can be directly traced back to the need in our scenarios for two vectorlike pairs of messenger fields for viable electroweak symmetry breaking.

Speaker: SHU TIAN EU

pheno2022_Shu Tian Eu.pdf

109 Towards an All-Orders Flavor Formalism in the (geo)SM(EFT) and Beyond

I will present novel model- and basis-independent formulae for calculating fermionic mass, mixing and CP-violation parameters given arbitrary 3x3 complex Yukawa couplings of the fundamental Lagrangian. The formalism is applicable to any construction whose Yukawas transform under certain global U(3) flavor symmetries, including the Standard Model (SM), numerous popular SM extensions and, as I will show, the geometric SM Effective Field Theory (geoSMEFT), which is a novel formulation of the SMEFT valid at all orders in the characteristic EFT expansion parameter v/Lambda. This merger of invariant theory and geoSMEFT technologies therefore allows for compact all-orders expressions for quark masses, CKM mixing angles and the Dirac phase. After showing off the applicability of the formulae, including the rapid derivation of renormalization group equations that are themselves valid at all orders in v/Lambda, I will discuss its future phenomenological and theoretical extensions, most notably in the neutrino flavor sector.

Speaker: Jim Talbert

GeoFLAV_Pheno22_JT.pdf

110 Acausality in Superfluid Dark Matter and MOND-like Theories

There has been much interest in novel models of dark matter that exhibit interesting behavior on galactic scales. A primary motivation is the observed Baryonic Tully-Fisher Relation in which the mass of galaxies increases as the quartic power of rotation speed. This scaling is not obviously accounted for by standard cold dark matter. This has prompted the development of dark matter models that exhibit some form of so-called MONDian phenomenology to account for this galactic scaling, while also recovering the success of cold dark matter on large scales. A beautiful example of this are the so-called superfluid dark matter models, in which a complex bosonic field undergoes spontaneous symmetry breaking on galactic scales, entering a superfluid phase with a 3/2 kinetic scaling in the low energy effective theory, that mediates a long-ranged MONDian force. In this work we examine the causality and locality properties of these and other related models. We show that the Lorentz invariant completions of the superfluid models exhibit high energy perturbations that violate global hyperbolicity of the equations of motion in the MOND regime and can be superluminal in other parts of phase space. We also examine a range of alternate models, finding that they also exhibit forms of non-locality.

Speaker: Neil Shah

Neil_Shah_Pheno_2021_Acausal_Superfluid_DM_Talk___05_08_22.pdf

Tuesday, 10 May

Breakfast

Plenary Tuesday Early

Convener: AMARJIT Soni

111 Physical Review Journals

Speaker: Joshua Sayre (APS)

JSayre_Pheno2022.pdf

Pheno2022.pdf

112 Flavor physics: current status and future goals, an experimentalist perspective

Speaker: Marina Artuso (Syracuse University (US))

ArtusoPheno2022.pdf

113 Heavy flavor physics

Speaker: Gil Paz

Paz_Pheno_2022_No_page_breaks.pdf

Paz_Pheno_2022.pdf

114 New development on Baryogenesis

Speaker: Yanou Cui (University of California, Riverside)

PHENO2022_BGnew.pdf

Symposium photo and Coffee Break

Plenary Tuesday Late

Conveners: Kaladi Babu (Oklahoma State University), Kaladi Babu

115 Physics with neutrino experiments

Speaker: Xiao Luo (Univ. of California Santa Barbara (US))

Physics in neutrino experiments.pdf

116 Nu physics: Theory and practice

Speaker: Peter Denton (Brookhaven National Laboratory)

Pheno_Denton.pdf

117 Adventures in perturbation theory

Speaker: Jacob Bourjaily (Penn State University)

pheno_22_bourjaily.pdf

Lunch

BSM III

Convener: Walter Tangarife (Loyola University Chicago)

118 Quantum analysis of the minimal realistic SO(10) model

The minimal renormalizable realization of $SO(10)$ model is an intriguing candidate for realistic extension of the Standard model. As the $SO(10)$ symmetry breaking is caused by the adjoint representation, the dominant GUT-scale-influencing gravitational effects are suppressed allowing for significantly improved proton lifetime calculations.
We present results of the thorough model’s parameter space analysis including one-loop quantum effects required in the physically relevant scenarios. We show that the model is consistent only in a narrow region of the parameter space supporting breaking chains with $SU(3)_c \times SU(2)_L \times SU(2)_R \times U(1)_{B-L}$ or $SU(4)_C \times SU(2)_L \times U(1)_R$ intermediate symmetry with the preference for the latter one.
This analysis also involved discussion of perturbativity constraints employing one-loop corrections to the scalar masses and one-loop beta functions of dimensionless scalar couplings.

Speaker: Katerina Jarkovska

JarkovskaPheno2022.pdf

119 Composite quarks and leptons with low-scale SO(10) unification

We propose a chiral gauge theory in which the Standard Model (SM) quarks and leptons are composite fields. The theory is based on an $SU(15)$ gauge symmetry that confines the preons and predicts exactly 3 generations of SM fermions. Certain vectorlike quarks and leptons are also formed, and may be within the reach of the LHC. We discuss the running of the SM gauge couplings to 3-loop order, showing that the SM gauge groups may unify under $SO(10)$, which is needed in order to regain asymptotic freedom. We study proton decay and show that the dominant operators lead to novel signatures that can be searched for at DUNE and other future experiments.

Speaker: Benoit Assi

Pheno 2022 - Benoit Assi.pdf

120 Observable proton decay in Flipped SU(5)

We explore proton decay in a class of realistic supersymmetric flipped $SU(5)$ models supplemented by a $U(1)_R$ symmetry which plays an essential role in implementing hybrid inflation. Two distinct neutrino mass models, based on inverse seesaw and type I seesaw, are identified, with the latter arising from the breaking of $U(1)_R$ by nonrenormalizable superpotential terms. Depending on the neutrino mass model an appropriate set of intermediate scale color triplets from the Higgs superfields play a key role in proton decay channels that include $p^+ \rightarrow (e^{+},\mu^+)\, \pi^0$, $p^+ \rightarrow ( e^+,\mu^{+})\, K^0 $, $p^+ \rightarrow \overline{\nu}\, \pi^{+}$, and $p^+ \rightarrow \overline{\nu}\, K^+ $. We identify regions of the parameter space that yield proton lifetime estimates which are testable at Hyper-Kamiokande and other next generation experiments. We discuss how gauge coupling unification in the presence of intermediate scale particles is realized, and a Z_4 symmetry is utilized to show how such intermediate scales can arise in flipped SU(5). Finally, we compare our predictions for proton decay with previous work based on SU(5) and flipped SU(5).

Speaker: Ms Maria Mehmood (Quaid-i-Azam University, Islamabad, Pakistan)

Observable Proton decay in flipped su(5).pdf

121 Semisimple extensions of the Standard Model

You are probably aware that the Standard Model can fit into su(5), so(10) and Pati-Salam. But did you know it can also fit into: su(4)+sp(4)+su(5)+su(2)+su(2). Probably not. Should you care? Also probably not. But what if I said, that without adding additional fermions (except 3 RHN), then there are only 340 semi-simple algebras the SM can actually fit into. This talk will tell the story behind the finding of these algebras. The talk is based on the papers: arXiv:2104.14555 and arXiv:2201.07245.

Speaker: Joseph Tooby-Smith

Pheno_2022.pdf

122 Learning the composition of Ultra-High Energy Cosmic Rays

We use use statistical inference to derive the mass composition of Pierre Auger Open Data at different energies. We simulate showers for all elements between proton and iron and use them to train a set of classifiers, each one trained to distinguish set of primaries by their 𝑋𝑚𝑎𝑥 distributions. By unfolding this data, we can obtain the most probable mass composition distribution for each energy bin. Moreover, we use timing information to correlate data from ground detectors to 𝑋𝑚𝑎𝑥 , which allows us to extract the mass composition from non-hybrid showers. We show the results using four different high energy hadronic model inputs for our simulations.

Speaker: Michele Tammaro

Pheno22_Tammaro.pdf

123 Simulation and Indirect Detection of Dark Glueball Showers

Parton showers are part and parcel of particle phenomenology, but what in the case of a confining dark sector with no light quarks below the confinement scale? Then the only available hadronic states are ‘glueballs’, composite gluon states. To date, there have been very few quantitative studies of dark shower signatures with glueball final states, despite the fact they commonly appear in motivated BSM theories such as neutral naturalness, and are prominent LLP candidates. This is due to the fact that commonly used hadronisation models, such as the Lund model, are no longer valid. We found that significant progress can be made despite the non-perturbative uncertainties. In this talk I will outline a method of simulating the formation of glueballs from a perturbative gluon shower, and how we handle the hadronisation process. This simulation has allowed us to study a variety of dark glueball phenomena quantitatively for the first time, including the indirect detection of DM annihilating into dark glueballs that then decay into the SM. Additionally, since the glueball decays depend on a range of operators, information on the UV completion of the sector may be able to be determined from multimessenger analysis of a potential signal. The $\texttt{GlueShower}$ simulation code is additionally publicly available for use by the BSM community.

Speaker: Caleb Gemmell (University of Toronto)

gemmell_pheno_final_v2.pdf

124 Simple, Interpretable Anomaly Detectors

Anomaly detection with autoencoders is a popular method to search for new physics in a model-agnostic manner.
In this talk, we try to understand these "black boxes" by designing mimickers with a small number of energy flow polynomials as inputs.
These mimickers perform comparably to the autoencoder when ordering background events, but also match the anomaly detection capabilities of the autoencoder across a variety of signal events.
Thus, this approach allows one to create simple, interpretable anomaly detectors.

Speaker: Layne Bradshaw

bradshaw_pheno_2022.pdf

125 FCNC in Concurrent Dark Photon & Dark Z Models

In this work we consider FCNC constraints on concurrent dark vector boson models simulatneously from B and K decays. Both the dark photon and the dark Z generate FCNC processes through loops due to kinetic mixing with the SM photon and Z boson respectively. Previously, the FCNC amplitudes with the dark photon and dark Z decays were calculated without the dipole term in the amplitude. Also, bounds on the gauge coupling and mixing parameter have only been obtained for either the dark photon case or the dark Z case. In our analysis, we perform a robust fit to the parameters of the most general dark vector model with light gauge bosons from the available data on meson decays. In the mass range of interest, the dark photon/Z can decay to neutrinos, charged leptons as well as light hadrons including several hadronic resonances which cannot be treated perturbatively. Very recently, the decay widths of such light vector bosons were calculated using the vector dominance model of chiral perturbation theory and fitting to the e+e− cross-sections from several experiments. We incorporate these results in our calculations to improve the analysis. We show constraints on the parameter space by considering both long distance and short distance NP.

Speaker: Lopamudra Mukherjee (University of Mississippi)

Pheno22_Lopa.pdf

Cosmology III

Convener: Jae Hyeok Chang (JHU/UMD)

126 Primordial clocks in stochastic gravitational wave anisotropies

Sudden onset of classical oscillations of a heavy field during inflation leaves a characteristic scale-invariance-breaking oscillatory feature in the power spectrum of primordial fluctuations. The presence of such features provides a unique opportunity to detect the dynamics of heavy fields during inflation. While such features are constrained to be small in adiabatic perturbations, we show that it may not be the case for isocurvature perturbations in multi-field inflationary scenarios. I will demonstrate a possibility of observing large primordial features in the anisotropies of stochastic gravitational wave (GW) background originating from a first-order phase transition in a hidden sector. I will show that the signal can be observably large in the GW map while being completely hidden in the standard adiabatic perturbations such as those of the Cosmic Microwave Background.

Speaker: Arushi Bodas

Pheno22-ArushiBodas.pdf

127 CMB Distortions from an Axion-Dark Photon-Photon Interaction

The Cosmic Microwave Background (CMB) spectrum matches that of a perfect blackbody with very high precision. Therefore, any model that distorts this spectrum is highly constrained. Motivated by certain dark sector models, we consider distortions caused by an axion-dark photon-photon coupling. In an axion dark matter background, this coupling converts CMB photons into invisible dark photons. We present the details of this distortion and the constraints on the axion-dark photon-photon coupling that result from it.

Speaker: Clayton Ristow (University of Maryland)

Pheno2022PDFVersion.pdf

Pheno2022PDFVersion.pptx

128 Stellar Remnants in the Presence of a Light Scalar

We study how a Yukawa coupling of the Standard Model fermion to a light scalar affects the stellar structure of cold stellar remnants such as neutron stars. For a broad scalar mass range, the equation-of-state and stellar structure depends only the effective coupling $g_{\rm eff}=g_f m_f / m_\phi$, where $g_f$ is the Yukawa coupling, $m_f$ the fermion mass and $m_\phi$ the scalar mass. If the effective coupling $g_{\rm eff}$ is larger than O(1), the Yukawa coupled matter exhibits various anomalous behaviors including hydrodynamic instability, negative pressure, distinct phases (soft and hard) of matter with sharp phase boundaries between them and with vacuum. These anomalies can lead to stars exhibiting an unusual mass-radius relation compared to that predicted by Oppenheimer-Volkoff model. To the extent that these anomalies have not and/or will not be observed limits the size of the new Yukawa coupling.

Speaker: Christina Gao

pheno22_gao_ns.pdf

129 Constraining Single Field Inflation with the SKA

The SKA allows to map the distribution of neutral hydrogen in the
Universe over a vast redshift range. The three-dimensional 21cm power
spectrum found through this map can be used to perform precision tests
not only for several astrophysical phenomena but also for early Universe
cosmology. Even considering only a small redshift range it allows to
significantly improve current constraints on the Hubble slow-roll
parameters when combined with the CMB anisotropies measurement of
Planck.

Speaker: Mr Lennart Röver (Institut für Theoretische Physik, Universität Heidelberg )

SKA_HSR_Pheno22.pdf

130 Astrometric weak lensing constraints on dark matter substructure with Gaia EDR3

In this work, we present updated results on an ongoing dark matter search using astrometric weak gravitational lensing. Following the analysis in Mondino et al. (2020), results are reported on a dark matter search using proper motions on stars in the Magellanic Clouds from Gaia's most recent data release. Additionally, we assess our method on star-star lensing, and introduce a parallax template method to aid in the dark matter search. Finally, we provide preliminary sensitivity estimates for an acceleration-based search for compact dark matter structures.

Speaker: Andreas Tsantilas (New York University)

tsantilas_pheno2022.pdf

131 What can we learn from the low-frequency spectrum of causal gravitational waves?

In the future, Stochastic Gravitational Wave Background can be measured by LISA. If the signal turns out to be produced by a causality-limited process such as a first-order phase transition, then the shape of its low-frequency spectrum would be independent of the details of the production mechanism. The slope of this low-frequency tail would encode information about the equation of state and the free streaming content of the universe at early times.

In this talk, we will show that future experiments such as LISA and DECIGO would be able to access this information and give us an unprecedented insight into the physics at temperatures $10^5-10^{10}$ GeV.

Speaker: Dawid Brzeminski (University of Maryland - College Park)

PHENO 2022-BRZEMINSKI .pdf

132 Stasis in an Expanding Universe: A Recipe for Stable Mixed-Component Cosmological Eras

One signature of an expanding universe is the time-variation of the cosmological abundances of its different components. For example, a radiation-dominated universe inevitably gives way to a matter-dominated universe, and critical moments such as matter-radiation equality are fleeting. In this talk, we point out that this lore is not always correct, and that it is possible to obtain a form of “stasis” in which the relative cosmological abundances $\Omega_i$ of the different components remain unchanged over extended cosmological epochs, even as the universe expands. Moreover, we demonstrate that such situations are not fine-tuned, but are actually global attractors within certain cosmological frameworks, with the universe naturally evolving towards such long-lasting periods of stasis for a wide variety of initial conditions. The existence of this kind of stasis therefore gives rise to a host of new theoretical possibilities across the entire cosmological timeline, ranging from potential implications for primordial density perturbations, dark-matter production, and structure formation all the way to early reheating, early matter-dominated eras, and even the age of the universe.

Speaker: Fei Huang (ITP CAS and UC Irvine)

Fei Huang PHENO 2022.pdf

133 Banks-Zaks Cosmology and Dark Energy

A limiting temperature of a species can cause the Universe to asymptote to it yielding a de-Sitter (dS) phase due to macroscopic emergent behavior. The limiting temperature is generic for theories slightly shifted from their conformal point. We demonstrate such behavior in the example of unparticles/Banks-Zaks theory. The unparticles behave like radiation at high energies reducing the Hubble tension and a cosmological constant at low energies yielding a model that follows closely ΛCDM model but due to collective phenomenon. It is technically natural and avoids the no-dS conjecture. The model is free of the coincidence and initial conditions problems, scalar fields, and modified gravity. One of the major predictions is a connection between the equation of state of Dark Energy $w$, and the number of relativistic degrees of freedom at decoupling $N_{eff}$. We fit the model to existing supernovae data and derive constraints on the cosmological parameters.

Speaker: Ido Ben-Dayan

pheno 2022 symposium.pdf

DM III

Convener: Ian Lewis (The University of Kansas)

134 Impact of UV photons from Dark Matter Annihilation on Cosmological Recombination and First Galaxies

If dark matter annihilates into high-energy Standard Model particles, the remnants of these final states can be discovered, for example by GeV-scale secondary photons from the galactic center. It is much more difficult to discover a scenario where dark matter annihilates into very low- energy photons. This may occur in the case where the annihilation produces a cascade of hidden- sector states that subsequently mix into visible photons. We study the impact of ultraviolet photons from dark matter annihilation on cosmological history. These photons may (1) alter the recombination history by exciting/ionizing atomic hydrogen, and (2) affect star formation by dissociating the molecular hydrogen coolants in the first star-forming galaxies. We use Planck data to constrain the cosmological history of a benchmark dark matter annihilation model and present new opportunities for early-universe probes of hidden sectors.

Speaker: Yash Aggarwal

DarkMatterUV.pdf

DarkMatterUV.pdf

135 A graph representation for the distribution of dark matter halos

Dark matter halos, produced during cosmic structure formation, organize themselves under gravity in an expanding background. We show that some novel features of their distributions can be understood in the framework of network theory by using a preferential attachment mechanism. For the subhalos sitting inside their least massive hosts, we create links based on their spatial extensions and construct a tree-like graph for each host halo. We use public state-of-the-art cosmological simulations to show that the degree distributions of these graphs are power-law with an index close to minus two. We show that the linear accretion rate in minor mergers corresponds to an asymptotic regime of linear preferential attachment, based on which we construct a simple network model that gives rise to the same power exponent. With the effects of major mergers and tidal evolution incorporated, our model can be used to efficiently generate the subhalo abundance and the hierarchical structure of subhalo distribution using a graph representation. These generated graphs give rise to similar graph metrics to the ones constructed from cosmological simulations. The topological and structural information encoded in the graph metrics can be exploited to quantify the recent accretion history of a halo or to probe some novel scale-dependent non-gravitational dynamics.

Speaker: Daneng Yang (Department of Physics, University of California, Riverside)

Daneng_Yang_pheno2022.pdf

136 Beyond the Free-Streaming Scale: The Detailed Shape of the Dark-Matter Velocity Distribution and its Impact on Cosmic Structure

In scenarios in which multiple production channels contribute the overall dark-matter abundance, the primordial dark-matter velocity distribution can exhibit a highly non-trivial shape involving multiple, well-separated peaks and can receive significant support across a broad range of scales. The effect of free-streaming in such scenarios can give rise to patterns of cosmic structure which drastically differ from those obtained in scenarios with narrow, unimodal dark-matter velocity distributions --- even scenarios with the same nominal free-streaming scale. In this talk, I discuss how the detailed shape of the dark-matter velocity distribution beyond the free-streaming scale impacts structure formation in both the linear and non-linear regimes. I examine the implications for the Lyman-alpha forest, for the halo-mass function, and for observables such as subhalo and cluster-number counts.

Speaker: Brooks Thomas

Pheno-2022-brooks-thomas-dm-velocity.pdf

137 Dark Solar Wind

We study the solar emission of light dark sector particles that self-interact strongly enough to self-thermalize. The resulting dark fluid accelerates under its own thermal pressure and attains highly relativistic bulk velocities in the solar system. Compared to the ordinary free-streaming scenario, the local dark outflow has a much higher number density and correspondingly a much lower average energy per particle. We show how this generic phenomenon arises in a dark sector comprised of millicharged particles strongly self-interacting via a dark photon. The dark plasma wind emerging in this model has novel yet predictive signatures that can be probed in upcoming experiments. This opens up a new pathway for probing light dark sector particles and is a first step toward exploring more general dark fluid outflows originating from other astrophysical systems.

Speaker: Erwin Tanin (Johns Hopkins University)

pheno2022_tanin.pdf

138 Neutrino point source searches for dark matter spikes

Any dark matter spikes surrounding black holes in our Galaxy are sites of significant dark matter annihilation, leading to a potentially detectable neutrino signal. In this paper we examine $10-10^5 M_\odot$ black holes associated with dark matter spikes that formed in early minihalos and still exist in our Milky Way Galaxy today, in light of neutrino data from the ANTARES and IceCube detectors. In various regions of the sky, we determine the minimum distance away from the solar system that a dark matter spike must be in order to have not been detected as a neutrino point source for a variety of representative dark matter annihilation channels. Given these constraints on the distribution of dark matter spikes in the Galaxy, we place significant limits on the formation of the first generation of stars in early minihalos---stronger than previous limits from gamma-ray searches in Fermi Gamma-Ray Space Telescope data. The larger black holes considered in this paper may arise as the remnants of Dark Stars after the dark matter fuel is exhausted; thus neutrino observations may be used to constrain the properties of Dark Stars. The limits are particularly strong for heavier WIMPs. For WIMP masses $\sim 5 \,$TeV, we show that $< 10 \%$ of minihalos can host first stars that collapse into BHs larger than $10^3 M_\odot$.

Speaker: Dr Patrick Stengel (SISSA)

nuSpikes_Pheno_Stengel.pdf

139 Re-analysis of 3.5 keV line

I describe a reanalysis of data sets that have previously been found to harbor evidence for an unidentified X-ray line at 3.5 keV in order to quantify the robustness of earlier results that found significant evidence for a new X-ray line at this energy. The 3.5 keV line is intriguing in part because of possible connections to dark matter. We analyze observations from the XMM-Newton and Chandra telescopes. We investigate the robustness of the evidence for the 3.5 keV line to variations in the analysis framework and also to numerical error in the chi-square minimization process. For example, we consider narrowing the energy band for the analysis in order to minimize mismodeling effects. The results of our analyses indicate that many of the original 3.5 keV studies (i) did not have fully converged statistical analyses, and (ii) were subject to large systematic uncertainties from background mismodeling. Accounting for these issues we find no statistically significant evidence for a 3.5 keV line in any X-ray data set.

Speaker: Yujin Park

Pheno2022.pdf

140 Free-streaming and Coupled Dark Radiation Isocurvature Perturbations: Constraints and Application to the Hubble Tension

Dark radiation (DR) appears as a new physics candidate in various scenarios beyond the Standard Model. While it is often assumed that perturbations in DR are adiabatic, they can easily have an isocurvature component if more than one field was present during inflation, and whose decay products did not all thermalize with each other. In this talk, I will discuss the constraints on both uncorrelated and correlated DR density isocurvature perturbations from the full Planck 2018 data alone, and also in combination with other cosmological data sets. Our work on free-streaming DR (FDR) updates and generalizes the existing bound on neutrino density isocurvature perturbations by including a varying number of relativistic degrees of freedom. In the case of coupled DR (CDR) isocurvature, we derive the first bound. I will also discuss that for isocurvature IC, FDR gives rise to larger CMB anisotropies compared to CDR -- contrary to the adiabatic case. More generally, we find that a blue-tilt of DR isocurvature spectrum is preferred from the cosmological data. This gives rise to a larger value of the Hubble constant $H_0$ compared to the standard $\Lambda$CDM+$\Delta N_{\rm eff}$ cosmology with adiabatic spectra and relaxes the Hubble tension.

Speaker: Subhajit Ghosh (University of Notre Dame)

SG-PHENO-May-2022.pdf

141 Post-Recombination Spectral Distortions from Dark Matter Energy Injection

Dark matter interactions with Standard Model particles can inject energy at early times, altering the standard evolution of the early universe. In particular, this energy injection can perturb the spectrum of the cosmic microwave background (CMB) away from that of a perfect blackbody. For this study, I will discuss recent work to update the DarkHistory code package to more carefully track interactions among low energy electrons, hydrogen atoms, and radiation, in order to accurately compute the evolution of the CMB spectral distortion in the presence of Dark Matter energy injection. I will show results for the contribution to the spectral distortions from redshifts z < 3000 for arbitrary energy injection scenarios.

Speaker: Ms Wenzer Qin (MIT)

2022-05-Pheno.pdf

Flavor II

Convener: Bhupal Dev (Washington University in St. Louis)

142 muon g-2 and BSM physics

Speaker: Radovan Dermisek

Dermisek-Pheno-May_10_2022-Radovan.pdf

143 $S_3$ 3HDM and Flavor Constraints

We investigate the scalar potential with soft breaking terms and flavor part of a general $S_3$-symmetric three-Higgs-doublet model. By assuming that the quarks, leptons and Higgs fields belong to irreducible representation of the permutation group $S_3$ and CP violation, parameter space that can reproduce quark masses, lepton masses, CKM matrix, PMNS matrix is obtained, which also satisfies the potential stability constraints, unitarity constraints, FCNC constraints and EDM constraints.

Speaker: Shiyuan Xu

Shiyuan_Pheno.pdf

144 Search for New Physics in B Decays

B decays form an ideal playground for indirect effects of new physics beyond the Standard Model (SM). At present there are several examples where experimental results deviate from the SM predictions. If these anomalies persist, new avenues will be necessary to pinpoint the nature of new physics. I will discuss a couple of B-decay channels, hadronic and semileptonic, where progress has been made toward identifying whether experimental anomalies could be due to new physics. I will make the case for simultaneous measurements of multiple observables as the way to determine the true nature of new physics.

Speaker: Prof. Bhubanjyoti Bhattacharya (Lawrence Technological University)

Pheno_2022.pdf

145 Resonances in $\bar\nu_e-e^-$ scattering at FASER$\nu$ and Forward Physics Facility

I will discuss the resonant production and detection of charged mesons in existing and near-future neutrino scattering experiments with $E_\nu \lesssim 1$ TeV, characteristic of high-energy atmospheric neutrinos or collider-sourced neutrino beams.
The most promising candidate is the reaction $\bar{\nu}_e e^-\rightarrow \rho^-\rightarrow \pi^- \pi^0$. I will discuss detection prospects at FASER$\nu$, the LHC's forward physics facility with nuclear emulsion (FASER$\nu$2) and liquid argon detectors (FLArE) and estimate the number
of expected resonance-mediated events in the existing data set of IceCube. In particular, dozens of events are predicted at the forward physics facility.
I will also outline possible detection strategies for the different experimental environments by identifying cuts with order one signal efficiency that
could potentially suppress backgrounds at FASER$\nu$, yielding a signal-to-background ratio larger than 1. Antineutrino-induced $s$-channel meson resonances
are yet unobserved Standard Model scattering processes which offer a realistic target for near-term experiments.

Speaker: Vedran Brdar (MPIK Heidelberg)

Vedran.pdf

146 Recent results from Belle II

The Belle II experiment at the SuperKEKB energy-asymmetric $e^+ e^-$ collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is $6\times 10^{35}$ cm$^{-2}$s$^{-1}$ and the Belle II experiment aims to ultimately record 50 ab$^{-1}$ of data, a factor of 50 more than its predecessor. With this data set, Belle II will be able to measure the Cabibbo-Kobayashi-Maskawa (CKM) matrix, the matrix elements and their phases, with unprecedented precision and explore flavor physics with $B$ and charmed mesons, and $\tau$ leptons. Belle II has also a unique capability to search for low mass dark matter and low mass mediators. We also expect exciting results in quarkonium physics with Belle II. In this presentation, we will review the latest results from Belle II.

Speaker: Lucia Kapitánová

Lucia_Kapitanova_PHENO-2022.pdf

147 Heavy QCD Axion at Belle II

The QCD axion is a well-motivated addition to the standard model to solve the strong $CP$ problem. If the axion acquires mass dominantly from a hidden sector, it can be as heavy as $O(1)$ GeV, and the decay constant can be as low as $O(100)$ GeV without running into the axion quality problem. We propose new search strategies for such heavy QCD axions at the Belle II experiment, where the axions are expected to be produced via $B\to K a$. We find that a subsequent decay $a\to 3\pi$ with a displaced vertex leads to a unique signal with essentially no background, and that a dedicated search can explore the range $O(1$-$10)$ TeV of decay-constant values. We also show that $a\to \gamma\gamma$ can cover a significant portion of currently unexplored region of $150 < m_a < 500$ MeV.

Speaker: Vazha Loladze (Department of Physics, Florida State University)

pheno22_vazha_loladze.pdf

148 Explaining lepton-flavor non-universality and self-interacting dark matter with $L_\mu-L_\tau$

Experimental hints for lepton-flavor universality violation in the muon's magnetic moment as well as neutral- and charged-current $B$-meson decays require Standard-Model extensions by particles such as leptoquarks that generically lead to unacceptably fast rates of charged lepton flavor violation and proton decay. We propose a model based on a gauged $U(1)_{L_\mu-L_\tau}$ that eliminates all these unwanted decays by symmetry rather than finetuning and efficiently explains $(g-2)_\mu$, $R_{K^{(*)}}$, $R_{D^{(*)}}$, and neutrino masses. The $U(1)_{L_\mu-L_\tau}$ furthermore acts as a stabilizing symmetry for dark matter and the light $Z'$ gauge boson mediates velocity-dependent dark-matter self-interactions that resolve the small-scale structure problems. Lastly, even the Hubble tension can be ameliorated via the light $Z'$ contribution to the relativistic degrees of freedom.

Speaker: Anil Thapa (University of Virginia)

Pheno22.pdf

Higgs II

Convener: Irene Zoi (Fermi National Accelerator Lab. (US))

149 Higgs Precision at a 125 GeV Muon Collider

The $s$-channel resonant production of the Higgs boson at a 125 GeV muon collider enables a unique way to determine the Higgs properties. However, a clear picture of the achievable Higgs precision has not yet been established. We perform a phenomenological study of the Higgs measurements at such resonant muon collider Higgs factory and present a systematic, detailed, and consistent extraction of Higgs precision measurements. Many new aspects about the lineshape scan, including the scaling with luminosity, optimal scan range, minimal scan steps, correlations with exclusive measurement, effective cross-section modeling, etc., are quantitatively studied in this work. All major exclusive Higgs channels are simulated and analyzed with Standard Model background, detection efficiencies, acceptance, angular distributions, and cross-channel correlations. Global analyses of the Higgs couplings are performed in the $\kappa$ framework and the effective-field-theory one. The results suggest that the 125 GeV muon-collider Higgs factory provides significant improvement to the Higgs coupling reach of the HL-LHC and provides independent and distinct Higgs precision information concerning future $e^+e^-$ colliders. We report results for both $5~$fb$^{-1}$ and $20~$fb$^{-1}$ integrated luminosity. These results provide comprehensive and quantitative physics understandings helpful in planning for the muon collider roadmap and global high-energy physics programs.

Speaker: Zhen Liu

MuCHiggs_Pheno2022_ZhenLiu.pdf

150 Constraining anomalous Higgs boson couplings to virtual photons.

We present a study of Higgs boson production in vector boson fusion and in association with a vector boson and its decay to two vector bosons, with a focus on the treatment of virtual loops and virtual photons. Our analysis is performed with the JHU generator framework, and the results are expressed in terms of an effective field theory. New features of this study include a proposal on how to handle singularities involving Higgs boson decays to light fermions via photons, calculation of the partial Higgs boson width in the presence of anomalous couplings to photons, and phenomenological observations regarding the special role of intermediate photons in analysis of LHC data in the effective field theory framework. Some of these features are illustrated with projections for experimental measurements with the full LHC and HL-LHC datasets.

Speaker: Jeffrey Davis (Johns Hopkins University (US))

Pheno_2022 .pdf

151 High precision Higgs physics at high energy muon colliders

We present results for the achievable sensitivity to Higgs properties via single Higgs production at future muon colliders. All relevant decay channels for on-shell Higgs production are analysed including physics backgrounds using fast simulation for a comprehensive picture of the expected precision. We additionally show results where we include some effects of the muon collider specific Beam Induced Background motivated by full simulation studies.

Speaker: Matthew Forslund (Stony Brook University)

MForslund-Pheno22.pdf

152 Higgs to two spin-zero particles with a 4b final state in vector boson fusion plus a photon

Some supersymmetric extensions to the standard model such as the two-Higgs doublet model (2HDM) predict the decay of the Higgs boson to two pseudoscalar particles (H-->aa), each of which may decay into low-pT bottom quarks. We conduct a sensitivity study with simulated events for the H-->aa-->4b decay, in which the SM Higgs is produced by Vector Boson Fusion with an associated photon (VBF+photon).

Speaker: Mr Stephen Roche (University of Pittsburgh (US))

pheno-talk-roche.pdf

153 Probing the nature of electroweak symmetry breaking with Higgs boson pair-production at ATLAS

In the Standard Model, the ground state of the Higgs field is not found at zero but instead corresponds to one of the degenerate solutions minimising the Higgs potential. In turn, this spontaneous electroweak symmetry breaking provides a mechanism for the mass generation of nearly all fundamental particles. The Standard Model makes a definite prediction for the Higgs boson self-coupling and thereby the shape of the Higgs potential. Experimentally, both can be probed through the production of Higgs boson pairs (HH), a rare process that presently receives a lot of attention at the LHC. In this talk, the latest HH searches by the ATLAS experiment are reported, with emphasis on the results obtained with the full LHC Run 2 dataset at 13 TeV. In the case of non-resonant HH searches, results are interpreted both in terms of sensitivity to the Standard Model and as limits on the Higgs boson self-coupling. Extrapolations of recent HH results towards the High Luminosity LHC upgrade are also discussed. Search results on new resonances decaying into pairs of Higgs bosons are also reported.

Speaker: Iza Veliscek (University of Oxford (GB))

Iza Veliscek-Pheno 2022-10thMay.pdf

154 Searches for additional Higgs bosons in ATLAS

The discovery of the Higgs boson with the mass of about 125 GeV completed the particle content predicted by the Standard Model. Even though this model is well established and consistent with many measurements, it is not capable to solely explain some observations. Many extensions of the Standard Model addressing such shortcomings introduce additional Higgs-like bosons which can be either neutral or charged. The current status of searches for additional low- and high-mass Higgs bosons based on the full LHC Run 2 dataset of the ATLAS experiment at 13 TeV are presented.

Speaker: Luis Pascual Dominguez (Tel Aviv University (IL))

pheno2022Draft.pdf

phenoAudiomp.mp3

155 Measurements of the CP structure of Higgs-boson couplings with the ATLAS detector

Studies of the CP properties of the Higgs boson in various production modes and decay channels are presented. Limits on the mixing of CP-even and CP-odd Higgs states are set by exploiting the properties of diverse final states.

Speaker: Christian Grefe (University of Bonn (DE))

2022-05-09_Pheno22_Grefe.pdf

156 Higgs Differential and STXS cross-sections in CMS

The talk will detail recent differential measurements of Higgs boson production, including both fiducial and STXS measurements, with bb, tautau, gamma gamma, ZZ and WW decay modes, by the CMS collaboration. Focus will be put on analyses exploiting the full statistical power of LHCs Run 2

Speaker: Roberto Seidita (Universita e INFN, Firenze (IT))

Higgs Differential and STXS cross sections in CMS.pdf

QCD&EW II

Convener: Dorival Gonçalves (Oklahoma State University)

157 W boson mass prediction in the Standard Model: the MSbar way

The recent W boson mass measurement by CDF disagrees with the Standard Model prediction, which can be obtained in several ways. I will discuss the W boson mass result obtained using the MSbar scheme, including a recent calculation of the 3-loop QCD correction.

Speaker: Stephen Martin

spmartin.pdf

158 Electroweak bosons as partons of the muon

In this short talk we revisit the treatment of weak gauge bosons as constituents of high-energy leptons. In particular, using a new, public implementation of (polarized) W/Z parton distribution functions in the Monte Carlo event generator MadGraph5_aMC@NLO, we report the size of universal, i.e., process independent, corrections that spoil the accuracy of a scattering/factorization formula for multi-TeV muon colliders. Guided by this insight, we give an outlook for polarized EW boson scattering at many TeVs.

arXiv link: https://arxiv.org/abs/2111.02442

Speaker: Richard Ruiz (Institute of Nuclear Physics (IFJ) PAN)

rruiz_Pheno22_MuEWA.pdf

159 Measurement of Z boson production in association with jets at ATLAS

Measurements of W/Z-boson production in association with jets are an important test of perturbative QCD prediction and also yield information about the parton distribution functions of the proton. This talk will present recent Z+jets results focusing on extreme phase-spaces with high pT jets as well as high pT heavy-flavour jets. The data are presented differentially and compared to next-to-leading order QCD calculations and to theoretical predictions provided by various Monte Carlo event generators.

Speaker: Pierre-Hugues Beauchemin (Tufts University (US))

Pheno2022_Beauchemin.pdf

160 Highlights of the ATLAS top quark precision measurements

The large top quark samples in top quark pair and single top production have yielded measurements of the production cross section of unprecedented precision and in new kinematic regimes. They have also enabled new measurements of top quark properties that were previously inaccessible. In this contribution the highlights of the ATLAS top quark precision program are presented. ATLAS presents in particular new measurements of the production cross section and production asymmetry of highly boosted top quark pairs and of the top quark polarization in t-channel single top production.

Speaker: Pavol Bartos (Comenius University (SK))

bartos_pheno2022_contribution.pdf

161 Global Analysis of Electroweak Data

In this talk, I will review the most recent global analysis of electroweak data in the Standard Model as obtained in the HEPfit framework (arXiv:2112.07274). Moreover, I will discuss the impact of the recent measurements of the top-quark mass (CMS collaboration) and of the W-boson mass (CDF collaboration) on the fit of electroweak data in the Standard Model and beyond with a particular emphasis on constraining new physics models with oblique corrections and the dimension-six Standard Model Effective Field Theory.

Speaker: Angelica Goncalves Dos Santos

AngelicaGoncalves-Pheno22.pdf

162 Mass and width of unstable particles

We show that the mass and width of an unstable particle are precisely defined by the pole in the complex energy plane, $\mu = m - (i/2)\Gamma$, by using the the defining relationship between the width and the lifetime, $\Gamma = 1/\tau$. We find that the physical $Z$ boson mass lies 26 MeV below its quoted value, while the physical $W$ boson mass lies 20 MeV below.

Speaker: Scott Willenbrock (University of Illinois at Urbana-Champaign)

Mass and Width PHENO22.pdf

163 Experimentally distinguishable origin for electroweak symmetry breaking

We consider a classically conformal $U(1)$ extension of the Standard Model (SM).
The $U(1)$ symmetry is radiatively broken by the Coleman-Weinberg mechanism, after which the $U(1)$ Higgs field $\phi$ drives electroweak symmetry breaking through a mixed quartic coupling with the SM Higgs doublet with coupling constant $\lambda_{mix}$.
We calculate the Higgs triple couplings in this system and find a suppression of the coupling $g_{h_{1} h_{2} h_{2}}$ when compared to the naively expected value $g_{h_{1} h_{2} h_{2}} \sim \lambda_{mix} v_{h}$ ($v_{h} = 246$ GeV), likely due to the unique nature of the classically conformal potential.
We consider experimental signals for such conformal structure via the anomalous Higgs boson decay $h \rightarrow \phi \phi$ and anomalous SM Higgs boson couplings.
Such specific conformal structure would allow for a sizeable anomalous SM Higgs boson coupling alongside a heavily suppressed $h \rightarrow \phi \phi$ decay mode, which can be tested by future $e^{+}e^{-}$ linear colliders.

Speaker: Victor Baules

VBaules_CW_talk_slides.pdf

Tools II

Convener: Yiming Zhong (University of Chicago)

164 Classifying Anomalies THrough Outer Density Estimation

Despite countless searches at the Large Hadron Collider (LHC), new physics remains elusive. The majority of these searches are highly model specific, requiring both background and signal simulation. In recent years, many anomaly detection methods have been proposed that use machine learning to enhance resonance searches without specifying a particular signal hypothesis. In this talk, I will present CATHODE (Classifying Anomalies THrough Outer Density Estimation), a novel model agnostic anomaly detection method built on the combination of neural density estimation and classification. I will show that it significantly outperforms all previous approaches aiming to enhance bump hunt searches, and that it achieves the best possible performance on the well-studied LHC Olympics R&D dataset. CATHODE represents a major step forward in the field of anomaly detection for high energy physics and will significantly enhance the breadth and sensitivity of searches at the LHC and beyond.

Speaker: Anna Hallin

Anna Hallin CATHODE Pittsburgh May 2022.pdf

165 I - Machine-Learning quantum entanglement with top quark pair production at the LHC

The top quark spin information is highly correlated with the final state lepton polarization, making the dileptonic $t\bar{t}$ events good candidates to study quantum entanglement at the LHC. The $t\bar{t}$ momentum reconstruction is a key ingredient to accurately assessing such measurements. I will be comparing the strengths and weaknesses of different top-quark momentum reconstruction methods, including machine learning and analytic approaches.

Speaker: Zhongtian Dong

Pheno22.pdf

166 II - Machine-Learning quantum entanglement with top quark pair production at the LHC

We present the projections to probe quantum entanglement in top pair events at the LHC. We discuss a necessary and sufficient condition to define entanglement for the $t\bar t$ events, focusing on the dileptonic final state. This study scrutinizes the performance of different reconstruction algorithms, including some machine learning-based methods, in searching for entanglement. We show that $t\bar{t}$ momentum reconstruction is a crucial ingredient to accurately assess such measurement.

Speaker: Alberto Navarro

Presentation_pheno2022.pdf

167 MADderHAT: Weighting the Model-Agnostic Dark Halo Analysis Tool

MADHAT (Model-Agnostic Dark Halo Analysis Tool) is a computational tool that processes data from Fermi Gamma-ray Space Telescope observations of dwarf galaxies and dwarf-like objects. MADHAT calculates the probability that some number of photons from each target object could be coming from non-standard astrophysics, including dark matter, and produces bounds on dark matter properties, such as the annihilation cross section and the decay rate. Unlike the majority of similar analyses, the bulk of MADHAT's analysis is model-independent. That is, MADHAT can be used to constrain the number of dark-matter-produced photons coming from a set of dwarf galaxies for any model of dark matter particle physics or astrophysics, including models of the more exotic variety. MADHAT version 1.0 weights all photons equally, irrespective of the sky region from which they come. Here, I report on progress implementing photon weights based on the dark matter and background expectations for each target object, which will improve sensitivity to dark matter models.

Speaker: Mr Zachary Carter (University of Utah)

Carter_Za_PHENO_Presentation.pdf

168 Machine learning the Higgs-top CP Measurement

We explore the direct Higgs-top CP structure via the $pp \to t\bar{t}h$ channel with machine learning techniques, considering the clean $h \to \gamma\gamma$ final state at the high luminosity LHC~(HL-LHC). We show that a combination of a comprehensive set of observables, that includes the $t\bar{t}$ spin-correlations, with mass minimization strategies to reconstruct the $t\bar{t}$ rest frame provides large CP-sensitivity.

Speaker: Rahool Kumar Barman (Oklahoma State University)

Higgs-top_CP_Pheno22.pdf

169 Jet SIFT-ing: A Scale Invariant Jet Clustering Algorithm for the Substructure Era

We describe a new jet clustering algorithm (SIFT: Scale-Invariant Filter Tree) that does not impose a fixed cone size or associated scale on the event. This construction maintains excellent object discrimination for very collimated partonic systems, tracks accrued mass, and asymptotically recovers favorable behaviors of both the standard KT and anti-KT algorithms. It is intrinsically suitable (without secondary declustering) for the tagging of highly boosted objects, and applicable to the study of jet substructure. Additionally, it is resilient to pileup, via a concurrent filter on soft wide-angle radiation applied within the primary clustering phase. Flexible termination conditions facilitate clustering to a fixed number of objects or identification of the "natural" object count. Linearithmic performance can be achieved through a new neighbor-finding framework based on the KDTree data structure that is compatible with higher-dimensional measures and "sociophobic" coordinates. Clustering histories are visualized in time with video simulation (we have movies!).

Speaker: Prof. Joel Walker (Sam Houston State University)

Jet_Movies_Walker_Pheno_22.zip

Jet-SIFTing_Boost_PHENO_22.pptx

170 Jet tagging with deep sets of subjets

We introduce a minimal and complete basis of subjets for machine learning-based jet tagging. The momenta, relative angles, and masses of the identified subjets are taken as input to a neural network. By adjusting the subjet radius, we can control the sensitivity to nonperturbative physics. We construct permutation invariant neural networks, Jet Flow Networks (JFN), which take as input the momenta and angles of the subjets. The basis introduced here is ideally suited to (i) systematically explore differences between a complete and overcomplete basis of observables that are taken as input to a machine learning architecture, and (ii) to quantify the information content of jets at the boundary of perturbative and nonperturbative physics. We demonstrate these aspects for quark vs. gluon and proton-proton vs. heavy-ion jets. The subjet basis introduced here exhibits a close connection to observables that are tractable in perturbative QCD, and we foresee applications for searches of physics beyond the Standard Model.

Speaker: Mr Dimitrios Athanasakos (YITP, Stony Brook)

Pheno 22-9.pdf

BSM IV

Convener: Wei Xue (University of Florida (US))

171 BSM interpretations of B-Physics and muon (g-2) anomalies

There are at present two significant (over 3 sigma) B-anomalies and also over 4-sigma muon (g-2) anomalies. Chances of at least one of these surviving the of time is very high. Consequently we are led to examine possible
signature for BSM interpretations. In this talk I will survey these and make a subjective case for one of these and offer clear and spectacular experimental
this at LHC and at future colliders.

Speaker: AMARJIT Soni

final version for Pheno 2022.pdf

172 Probing B-Anomalies via Dimuon Tails at a Future Collider

In this talk we investigate the sensitivity of future proton-proton colliders to a contact interaction of the form $1/\Lambda^2 (\bar b_L \gamma_\mu s_L)(\bar \mu_L \gamma^\mu \mu_L)$ as indicated by the long-standing rare $B$-decay anomalies. We include NLO QCD and electroweak effects and employ an optimized binning scheme, and carefully validate our background calculation against ATLAS and CMS data.We find that the FCC-hh with $40$ ab$^{-1}$ of luminosity is able to exclude scales $\Lambda$ up to 26 TeV at $95 \%$ CL, and discover $\Lambda$ up to 20 TeV. While this is not quite enough to exclude or discover the current best-fit value of $39$ TeV, this can in principle be achieved with more luminosity and/or higher energy, as we study quantitatively. Our analysis is conservative in that it assumes only a $\bar b s \mu \mu $ contact interaction.

Speaker: Sandra Kvedaraite

Future Collider Talk.pdf

Future Collider Talk.pdf

173 Probing BSM Physics in $B\to D^{*+}\ell^- \bar{\nu}$ Using Monte Carlo Simulation

Several experimental measurements of $b$-decays have suggested the presence of physics beyond the Standard Model (BSM). One set of such measurements are the decay modes $B\to D^{*+}\ell^- \bar{\nu}$ with $\ell = e, \mu,$ and $\tau$. A recent analysis of 2019 Belle data found $\Delta A_{FB} = A_{FB}(B\to D^{*} \mu\nu) - A_{FB} (B\to D^{*} e \nu)$ to be $4.1\sigma$ away from the SM prediction. Improved simulation and analysis tools are needed in order to more effectively probe these new physics (NP) possibilities. We have developed a Monte-Carlo event generator tool based on the EVTGEN framework to simulate NP signatures in $B\to D^{*+}\ell^- \bar{\nu}$, which arise due to the interference between the SM and NP amplitudes. We have also simulated several example NP scenarios which are able to explain the $\Delta A_{FB}$ anomaly, while remaining consistent with experimental constraints. We also show that $\Delta$-type observables allow for definite signals of NP by removing most QCD uncertainties from the form factors, and introduce several correlated observables that allow for more sensitivity to NP.

Speaker: Mr Quinn Campagna (University of Mississippi)

Pheno Presentation.pdf

174 New physics signature in the decays of B-meson to missing particles

Semileptonic flavor changing neutral current transitions with a pair of neutrinos in the final state are very accurately determined in the standard model. The most recent Belle II result on $B\to K \nu \bar\nu$ uses an innovative inclusive tagging technique; this together with previous BaBar and Belle results indicates a possible enhancement in the branching fraction of $B\to K \nu \bar\nu$ . We have explored the possibilities of such an enhancement as a signal of new physics within several scenarios such as leptoquark and generic Z′ models, which can also explain some of the other tensions observed in neutral as well as charged current B-decays.

Speaker: Rusa Mandal (Siegen University)

Pheno22_Rusa.pdf

175 Searches for BSM physics using challenging and long-lived signatures with the ATLAS detector

Various theories beyond the Standard Model predict new, long-lived particles with unique signatures which are difficult to reconstruct and for which estimating the background rates is also a challenge. Signatures from displaced and/or delayed decays anywhere from the inner detector to the muon spectrometer, as well as those of new particles with fractional or multiple values of the charge of the electron or high mass stable charged particles are all examples of experimentally demanding signatures. The talk will focus on the most recent results using 13 TeV pp collision data collected by the ATLAS detector.

Speaker: Mason Proffitt (University of Washington (US))

Mason Proffitt - Pheno 2022 v4.pdf

176 Searches for rare top quark production and decay processes with the ATLAS experiment

Run 2 of the LHC has witnessed the observation of many rare top quark production processes predicted by the Standard Model and has boosted searches for flavour- changing-neutral-current interactions of the top quark, that are heavily suppressed in the SM. In this contribution the highlights are shown of searches by the ATLAS experiment for rare processes involving top quarks. Results are presented for several associated top quark production processes of top quarks with Standard Model gauge bosons. The recent observation of associated production of a single top quark with a photon completes the list of processes and adds sensitivity to the EW couplings of the top quark. ATLAS furthermore reports strong evidence for the four-top-production process. Finally, results are presented of searches for flavour-changing-neutral-current processes involving top quarks. Searches in the full run 2 data set have been performed for tqg, tqgamma, tqZ and tqH interactions, with bounds exceeding previous limits by large factors.

Speaker: Jiri Hejbal (Czech Academy of Sciences (CZ))

Hejbal_Pheno2022.pdf

177 Searches for supersymmetry in hadronic final states with the CMS experiment

The latest results of searches for supersymmetry in hadronic final states with the CMS experiment will be presented. The analyses are based on the full dataset of proton-proton collisions collected during the Run 2 of the LHC at a center-of-mass energy of 13 TeV.

Speaker: Vinay Hegde (Texas Tech University (US))

Pheno2022_HadronicSUSYatCMS.pdf

178 Search for heavy BSM particles coupling to third generation quarks at CMS

We present results from searches for resonances with enhanced couplings to third generation quarks, based on proton-proton collision data at a centre-of-mass energy of 13 TeV recorded by CMS. The signatures include single and pair production of vector-like quarks and heavy resonances decaying to third generation quarks. A wide range of final states, from multi-leptonic to entirely hadronic is covered. Jet substructure techniques are employed to identify highly-boosted heavy SM particles in their hadronic decay modes.

Speaker: Ia Iashvili (The State University of New York SUNY (US))

Pheno22_Iashvili_final.pdf

Cosmology IV

Convener: Vedran Brdar

179 Gravitational Waves from an Inflation Triggered First-Order Phase Transition

Large excursion of the inflaton field can trigger interesting dynamics. One important example is a first-order phase transition in a spectator sector which couples to the inflaton. Gravitational waves (GWs) from such a first-order phase transition during inflation, an example of an instantaneous source, have an oscillatory feature. In this work, we show that this feature is generic for a source in an era of accelerated expansion. We also demonstrate that the shape of the GW signal contains information about the evolution of the early universe following the phase transition. In particular, the slope of the infrared part of the GW spectrum is sensitive to the evolution of the Hubble parameter when the GW modes reenter the horizon after inflation. The slope of the profile of the intermediate oscillatory part and the ultraviolet part of the GW spectrum depend on the evolution of the Hubble parameter when the modes exit horizon during the inflation and when they reenter the horizon during the reheating. The ultraviolet spectrum also depends on the details of the dynamics of the phase transition. We consider the GW signal in several models of evolution during and after inflation, and compare them with the minimal scenario of quasi-de Sitter inflation followed by radiation domination after a fast reheating, and demonstrate that the shape of the GW can be used to distinguish them. In this way, the GW signal considered in this paper offers a powerful probe to the dynamics of the early universe which is otherwise difficult to explore directly through CMB, large scale structure, big bang nucleosynthesis (BBN), and other well-studied cosmological observables.

Speaker: Kunfeng Lyu (University of Minnesota)

GWfromPT-Inflation.pdf

180 Cosmological Measurements of Light but Massive Relics

Cosmological data provide a powerful tool in the search for physics beyond the Standard Model (SM). An interesting target are light relics, new degrees of freedom which decoupled from the Standard Model while relativistic. Nearly massless relics contribute to the radiation energy budget, and are commonly searched through variations in the effective number Neff of neutrino species. Additionally, relics with masses on the eV scale (meV-10 eV) become non-relativistic before today, and thus behave as matter instead of radiation. This leaves an imprint in the clustering of the large-scale structure of the universe, as light relics have important streaming motions, mirroring the case of massive neutrinos. Here we forecast how well current and upcoming cosmological surveys can probe light massive relics (LiMRs). We consider minimal extensions to the SM by both fermionic and bosonic relic degrees of freedom. By combining current and upcoming cosmic-microwave-background and large-scale-structure surveys, we forecast the significance at which each LiMR, with different masses and temperatures, can be detected.

Speaker: Nicholas DePorzio

2022.05.10_PHENO.pdf

181 Constraints on Self-interacting Radiations with Cosmological Data

Self-interacting radiations are generic consequences of many BSM models. I present a comprehensive study of cosmological constraints on self-interacting light relics using cosmic microwave background and baryon acoustic oscillation data. In this talk, I will describe how to implement self-interacting radiation in the Boltzmann hierarchy and show results for different types of relics and interactions.

Speaker: Jae Hyeok Chang (JHU/UMD)

Slides_Chang.pdf

182 High-pT muons in cosmic-ray air showers

The composition of high-energy cosmic rays is a long-standing puzzle in astrophysics. One obstacle to understanding the composition is the significant theoretical uncertainties in predicting high-energy cosmic-ray air showers, which is difficult to improve because most air shower observables are sensitive to the details of the collinear region. To combat this problem, IceCube has measured high-pT muons from cosmic ray air showers by identifying muons far away from the shower core, which largely depend on perturbative QCD and therefore suffer from smaller theoretical uncertainties. I will discuss our theoretical predictions of high-pT muons in air showers and the robustness of this observable.

Speaker: Shirley Li (Fermilab)

muon_highpT_Li.pdf

183 Correlating Gravitational Wave and Gamma-ray Signals from Primordial Black Holes

Primordial black holes are produced in the early Universe by large curvature perturbations and can explain the dark matter abundance within current constraints. During their creation, gravitational waves are produced that could be measured by future gravitational wave detectors. These black holes will also produce a visible electromagnetic signature through Hawking radiation that may similarly be detectable in future gamma-ray detectors. Through the observation of both signals, precise measurement of the primordial curvature perturbations can be made.

Speaker: Steven Clark (Brown University)

Pheno_2022_Steven_Clark.pdf

184 A Step in Understanding the Hubble Tension

As cosmological data have improved, tensions have arisen. One such tension is the difference between the locally measured Hubble constant $H_0$ and the value inferred from the cosmic microwave background (CMB). Interacting radiation has been suggested as a solution, but studies show that conventional models are precluded by high-ℓ CMB polarization data. It seems at least plausible that a solution may be provided by related models that distinguish between high- and low-ℓ multipoles. When interactions of strongly-coupled radiation are mediated by a force-carrier that becomes non-relativistic, the dark radiation undergoes a "step" in which its relative energy density increases as the mediator deposits its entropy into the lighter species. If this transition occurs while CMB-observable modes are inside the horizon, high- and low-ℓ peaks are impacted differently, corresponding to modes that enter the horizon before or after the step. These dynamics are naturally packaged into the simplest supersymmetric theory, the Wess-Zumino model, with the mass of the scalar mediator near the eV-scale. We investigate the cosmological signatures of such "Wess-Zumino Dark Radiation" (WZDR) and find that it provides an improved fit to the CMB alone, favoring larger values of $H_0$. Utilizing a standardized set of measures, we compare to other models and find that WZDR is among the most successful at addressing the $H_0$ tension.

Speaker: Melissa Joseph

Pheno2022_Melissa.pdf

185 Neff constraint on portal interaction with hidden sectors

Measurement of the effective number of neutrino species, $N_{\rm eff}$, by future cosmic microwave background (CMB) experiments is expected to be sensitive enough to rule out new relativistic particles that were in equilibrium with the Standard model (SM) plasma, if the measured $N_{\rm eff}$ value is consistent with the SM value of 3.044. Consequently, the interaction between the new relativistic particles and SM particles will then be strongly constrained. For a given confidence interval around the SM $N_{\rm eff}$ value, we show a straightforward way to compute the $N_{\rm eff}$ constraints on renormalizeable portal interactions between the new relativistic particles and the SM particles. These $N_{\rm eff}$ constraints can be orders of magnitude larger than collider constraints for future CMB measurements. We demonstrate our result on a model with gauged $B-L$ symmetry with right-handed neutrinos and a model with millicharged particles and dark photon as examples. We also show that CMB-S4 $N_{\rm eff}$ measurements have the potential to rule out extended millicharged particle models that resolve the EDGES 21 cm anomaly. Finally, we find that $N_{\rm eff}$ constraints on renormalizeable portal couplings remain largely unchanged even if the new relativistic particles are part of a larger hidden sector.

Speaker: Pranjal Ralegankar

Neff constraints.pdf

DM IV

Conveners: Brooks Thomas (Colorado College), Brooks Thomas

186 A theory of dark pions

We present a complete model of a dark QCD sector with light dark pions, broadly motivated by hidden naturalness arguments. The dark quarks couple to the Standard Model via irrelevant $Z$- and Higgs-portal operators, which encode the low-energy effects of TeV-scale fermions interacting through Yukawa couplings with the Higgs field. The dark pions, depending on their $CP$ properties, behave as either composite axion-like particles (ALPs) mixing with the $Z$ or scalars mixing with the Higgs. The dark pion lifetimes fall naturally in the most interesting region for present and proposed searches for long-lived particles, at the LHC and beyond. This is demonstrated by studying in detail three benchmark scenarios for the symmetries and structure of the theory. Within a coherent framework, we analyze and compare the GeV-scale signatures of flavor-changing meson decays to dark pions, the weak-scale decays of $Z$ and Higgs bosons to hidden hadrons, and the TeV-scale signals of the ultraviolet theory. New constraints are derived from $B$ decays at CMS and from $Z$-initiated dark showers at LHCb, focusing on the displaced dimuon signature. We also emphasize the strong potential sensitivity of ATLAS and CMS to dark shower signals with large multiplicities and long lifetimes of the dark pions. As a key part of our phenomenological study, we perform a new data-driven calculation of the decays of a light ALP to exclusive hadronic Standard Model final states. The results are provided in a general form, applicable to any model with arbitrary flavor-diagonal couplings of the ALP to fermions.

Speaker: LINGFENG LI (Brown U.)

Dark_Pions_Pheno2022.pdf

187 The Darkest Matters: Model-Independent Constraints on Dark Matter and Cosmic Neutrinos

In this talk, we use planetary and asteroid data to set new model-independent constraints on dark matter and cosmic neutrinos. See https://arxiv.org/abs/2107.04038 and https://arxiv.org/abs/2112.07674 for related previous works.

Speaker: Yu-Dai Tsai (University of California, Irvine)

Planetary_Quantum_DM_Tsai.pdf

188 Sterile neutrino dark matter, self-interactions, and supernovae

In this talk, we explore the consequences of neutrino self-interactions for the production of sterile neutrino dark matter.  We present how neutrino self-interactions allow keV sterile neutrinos to make up all the dark matter while safely evading all current experimental bounds. In addition, we revisit and update the constraints that supernova neutrino observations impose on the mass scale and coupling of the new interactions.

Speaker: Walter Tangarife (Loyola University Chicago)

Tangarife_SterileNeutrino_Pheno22.pdf

189 First Laboratory Bounds on Ultralight Dark Photon Dark Matter from Precision Atomic Spectroscopy

Ultralight bosonic dark matter has come under increasing scrutiny as a dark matter candidate that can resolve numerous puzzles in astronomical observation. We demonstrate that high-precision measurements of time variation in the frequency ratios of atomic transitions achieves leading sensitivity to ultralight vector portal dark matter. These bounds are the first laboratory-based bounds on this class of dark matter models. We propose further measurements that could enhance sensitivity to ultralight dark photons.

Speaker: Dr Amit Bhoonah (Colorado State University)

Pheno2022.pdf

190 Large N Composite Dark Matter through the Magnetic Dipole Interaction

Fermionic dark matter could arise from a strongly interacting dark sector. Dark quarks are bound into neutral composite dark baryons, which can be probed by direct detection experiments through a magnetic dipole interaction. We consider theories where the strong interaction consists of $N_{c}$ colors, where $N_{c}$ is odd and large, and place bounds on the parameter space of the theory using direct detection and cosmological constraints.

Speaker: Chester Mantel

Chester Mantel Pheno2022.pdf

191 Polarized solitons in higher-spin dark matter

Apart from the Standard Model, our Universe could be host to a diverse set of degrees of freedom (dark sector). The dark sector could comprise of various bosonic fields with possible self interactions alongside gravity, containing macroscopic/astrophysical bound states known as solitons. Depending upon the spin nature of the field, these solitons can even carry huge amounts of intrinsic spin polarization!, leading to interesting phenomenology. In this talk, I will discuss such solitons arising in spin-1 and higher fields, including Yang-Mills theories in the Higgs phase. For masses in the fuzzy dark matter regime, such ‘spinning’ solitons may form the cores of dark matter halos, with halos in general being distinguishable from their scalar counterparts. Time permitting, I will also present a possible thermal production scenario of spin-1 fields (with or without self interactions) that can constitute all of the observed DM.

Speaker: Mudit Jain

Mudit.Jain.Presentation.Pheno2022.pdf

192 Cosmological Dark Photon Oscillations in Non-Minimal Dark Sectors

As many of us know, the cosmic microwave background has a black-body spectrum. This is confirmed by COBE-FIRAS data three decades ago with exact measurement and tiny error bars.

However, the existence of new physics, such as the photon-dark photon oscillation with non-zero kinetic mixing, will distort the black body spectrum. Based on this character, and the fact that the deviation of CMB from the black body spectrum is highly constrained, we can give strict constraints on the new physics, for example, the dark photon parameter space.

In our work, we extend the discussion to the non-minimal dark sector and strongly constrain the millicharged particles(MCPs) parameter space. We will also discuss how the existence of MCPs will change the FIRAS bound of the minimal dark photon model.

Speaker: Mr Xucheng Gan (New York University)

Pheno2022_Pre.pdf

DM VI

Convener: Debasish Borah (Indian Institute of Technology Guwahati)

193 Secondary Tau Neutrino Probes of Heavy Dark Matter Decays

Dark matter particles can be gravitationally trapped by celestial bodies, motivating searches for localized annihilation or decay. We compute the secondary tau neutrino spectrum at the surface from decays within the Earth and examine the reach of the IceCube high-energy starting event (HESE) sample in the dark matter model parameter space, using numerical simulations along with updated modelling of dark matter capture and thermalization. We find that the parameter space probed by IceCube searches would require dark matter cross-sections in tension with existing direct-detection bounds.

Speaker: Jeffrey Hyde

Hyde_Pheno2022.pdf

194 The Migdal Effect in the Hydrogen Molecular Ion

The Migdal effect, which describes electronic transitions after nuclear scattering, has been proposed as a mechanism for direct detection of light dark matter. The Migdal effect can be understood as a first order departure from the Born-Oppenheimer approximation of factorization of electrons and nuclei, and thus molecules are an especially interesting system to study this effect. I will present calculations of the Migdal effect in the simplest molecular system, the hydrogen molecular ion ($H_2^+$), with the goal of understanding how this effect generalizes to more complicated molecules. I will describe two qualitatively different contributions to the Migdal effect, one of which is a straightforward generalization of the atomic Migdal effect but the other of which is unique to molecules. Our results suggest the interesting possibility of observing large daily modulation from dark matter-nuclear scattering in molecular systems.

Speaker: Ian Harris

H2__Slides_Harris.pdf

195 Measuring the Migdal Effect with Neutrons

The Migdal Effect, in which an electron is ejected in a dark matter-nucleus scattering event, provides a powerful probe of sub-GeV dark matter. However, this effect has not yet been experimentally observed and calibrated. We have carefully analyzed the kinematics of neutron-induced Migdal scattering events and propose a detection concept for the Migdal effect that utilizes the standard backing-array techniques used in calibrating low-energy nuclear recoil ionization yields in direct-detection experiments. We analyze the detection potential of Xe and Si. Our calculations serve as an important step in a broader “Migdal program” that will lead to an improved understanding, both theoretical and experimental, of this powerful tool for probing sub-GeV dark matter

Speaker: Duncan Adams (C.N. Yang Institute of Theoretical Physics)

Pheno 2022-3.pdf

196 Non-perturbative effects in a simplified t-channel dark matter model

The existence of a dark matter model with a rich dark sector could be the reason why WIMP dark matter has evaded its detection so far. For example, colored co-annihilation naturally leads to the prediction of heavier dark matter masses. Importantly, in such a scenario the Sommerfeld effect and bound state formation must be considered in order to accurately predict relic abundance. We use the widely studied t-channel simplified model with a colored mediator to demonstrate the importance of considering these non-perturbative effects and discuss its impact on constraints on the paramater space of the model from the LHC and direct detection experiments.

Speaker: Kirtimaan Ajaykant Mohan

Pheno_2022_Kirtimaan_Mohan.pdf

197 Bound state effects on dark matter coannihilation - pushing the boundaries of t-channel mediator models

Bound-state formation effects can have a large impact on the dynamics of dark matter freeze-out in the early Universe, in particular, for colored coannihilators. We present a general formalism to include an arbitrary number of excitations of bound states in terms of an effective annihilation cross section. For a coannihilator in the fundamental representation of SU(3)c, we discuss radiative bound-state formation, decay, and electromagnetic transition rates among them. We then assess the impact of bound states within a model with Majorana dark matter and a colored scalar t-channel mediator. We consider the regime of coannihilation as well as conversion-driven freeze-out (or coscattering), where the relic abundance is set by the freeze-out of conversion processes. We find that the latter region is considerably enhanced due to bound-state effects with far-reaching implications for search strategies at the upcoming LHC runs.

Speaker: Jan Heisig (Université catholique de Louvain (UCL))

Heisig_Pheno.pdf

198 Higgsino Dark Matter Theory and its Experimental Probes

We examine a particularly compelling class of supersymmetric models with Higgsino-like thermal dark matter. In particular, this class of models has a split in energy scales between the Standard Model particles and the supersymmetric scalar masses motivated by the mass of the Higgs boson and by existing experimental bounds. While having very few input parameters, many of the supersymmetry breaking parameters are either described explicitly or through mediation of a conformal anomaly. We explore this space in terms of direct and indirect detection, along with electron electric dipole moment experiments, and show the available parameter space is almost entirely accessible to next generation experiments.

Speaker: Benjamin Sheff

Pheno22_presentation.pdf

Neutrinos II

Convener: Anna M. Suliga (UC Berkeley and U. of Wisconsin)

199 A New Idea for Relic Neutrino Detection

The detection of the cosmic neutrino background (CvB) is an outstanding problem in particle physics and cosmology. We propose a new way to detect CvB via resonant scattering against cosmogenic GZK neutrinos, which leads to an attenuation of the GZK neutrino flux. However, to have any observable effect, we need significant CvB overdensity along the line-of-sight. This might be feasible in certain astrophysical environments and/or if neutrinos have a large self-interaction.

Speaker: Dr Bhupal Dev (Washington University in St. Louis)

dev_pheno22.pdf

200 Dirac neutrinos and Neff

We perform a model-independent study of various possibility of Dirac neutrinos that its right-handed component may lead to contributions to the effective number of relativistic neutrino species $N_{eff}$. We obtained constrains on these interactions by using the current and future limits on $N_{eff}$ from CMB experiments.

Speaker: Xuheng Luo

xuheng.pdf

201 Inelastic neutrino-nucleus and dark matter-nucleus scattering

We study inelastic neutrino-nucleus and dark matter(DM)-nucleus scattering using Ar-40 Cs-133, and I-127 nuclei. In particular we use BIGSTICK, a nuclear shell model code, to obtain the structure of the nuclei. We then calculate the inelastic scattering cross section based on two formalism, multipole analysis and Gamow-Teller transition. It concludes that Gamow-Teller operator dominates over multipole operators. For dark matter we consider a vector boson couple to nucleon and dark matter. We also estimate the event rates for the experiments such as CCM and COHERENT.

Speaker: Wei-Chih Huang

Phenon_2022.pdf

202 Naturally light Dirac neutrinos from left-right symmetric models

I shall describe how naturally light Dirac neutrinos arise in a class of left-right symmetric theories which also solve the strong CP problem. The flavor structure of these theories will be shown to be consistent with neutrino oscillation data. Future tests of these models will be outlined.

Speaker: Kaladi Babu

Pheno_22.pdf

203 Probing non-standard neutrino interactions with low energy neutrino-electron elastic scattering in reactor experiments

Reactor experiments provide an excellent platform to investigate the atomic ionization effects induced by the unexplored neutrino interaction channels. Including the atomic effects in our calculations, we study the neutrino-electron scattering by reactor anti-neutrinos in low-energy electron recoil detectors such as Si/Ge in light of neutrino non-standard interactions with leptons. We find that the atomic and crystal effects in Si/Ge yield a sizable suppression to the neutrino-electron scattering rate when compared to the free-electron approximation. We present our sensitivity results for the light vector and scalar mediator case. The explanation of the excess in the recent Xenon1T result can also be investigated at the reactor experiments since the reactors have a similar energy flux profile to solar neutrinos with characteristic neutrino energies <1 MeV.

Speaker: Ankur Verma

Pheno2022_Ankur.pdf

204 Type III seesaw with R-parity violation in light of mW (CDF)

Motivated by the recently reported measurement of the W boson mass MW=80.4335±0.0094 GeV by the CDF collaboration, we propose a type III extension of the minimal supersymmetric standard model (MSSM) which also includes an R-parity violating term. Without taking potential SUSY radiative corrections into account, we show that the CDF measurement of MW and the LEP measurement of the ρ parameter can be simultaneously accommodated at the 2σ level. A long-lived gravitino in a few GeV mass range is a unique viable dark matter candidate in this framework.

Speaker: Nobuchika Okada

Okada_Short_PHENO_2022.pdf

205 On Perturbative Completions to the Neutrino Option Resolution of the Electroweak Hierarchy Problem

I will show how the global symmetries manifest in the Type-I seesaw model can be understood to prohibit (natural) perturbative scale generation in its Majorana mass matrix, and therefore severely limit the types of ultraviolet (UV) completions that may be conceived of for the Neutrino Option (NO) resolution to the Electroweak Hierarchy Problem (Brivio & Trott 2017). After a brief review of the basics of the NO, its phenomenology, and the global symmetries present in its Lagrangian, I will systematically demonstrate how they conspire to generate no-go limitations in the simplest instances. I will also show that perturbative scenarios with enhanced BSM field content also face significant symmetry-driven constraints, before concluding with speculative comments on non-perturbative UV-completion alternative(s), and (potentially) also naturalness comments relevant to constructions involving light sterile neutrinos.

Speaker: Jim Talbert

NeutrinoNoGo_Pheno22_JT.pdf

QCD&EW III

Convener: Ciaran Williams (SUNY Buffalo)

206 W Mass at CDF II

Speaker: Joey Huston (Michigan State University (US))

huston_pheno22_Wmass.pdf

207 A theoretical overview on the W-Mass measurement

Speaker: Joshua Isaacson

M_W__A_Theory_Overview__Pheno_.pdf

pheno_M_W_review.pdf

208 Electroweak Restoration at the LHC and Beyond: The Vh Channel

The LHC is exploring electroweak (EW) physics at the scale EW symmetry is broken. As the LHC and new high energy colliders push our understanding of the Standard Model to ever-higher energies, it will be possible to probe not only the breaking of but also the restoration of EW symmetry. We propose to observe EW restoration in double EW boson production via the convergence of the Goldstone boson equivalence theorem. This convergence is most easily measured in the vector boson plus Higgs production, Vh, which is dominated by the longitudinal polarizations. We define EW restoration by carefully taking the limit of zero Higgs vacuum expectation value (vev). We demonstrate that the 14 TeV HL-LHC can confirm that this ratio converges to one to 40% precision while at the 27 TeV HE-LHC the precision will be 6%. We also investigate statistical tests to quantify the convergence at high energies. Our analysis provides a roadmap for how to stress test the Goldstone boson equivalence theorem and our understanding of spontaneously broken symmetries, in addition to confirming the restoration of EW symmetry.

Speaker: Ian Lewis (The University of Kansas)

IL_Pheno_2022.pdf

209 Searches for strong production of supersymmetric particles with the ATLAS detector

Supersymmetry (SUSY) provides elegant solutions to several problems in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. Naturalness arguments for weak-scale supersymmetry favour supersymmetric partners of the gluons and third generation quarks with masses light enough to be produced at the LHC. This talk will present the latest results of searches conducted by the ATLAS experiment which target gluino and squark production, including stop and sbottom, in a variety of decay modes. It covers both R-parity conserving models that predict dark matter candidates and R-parity violating models that typically lead to high-multiplicity final states without large missing transverse momentum.

Speaker: Bertrand Martin Dit Latour (University of Bergen (NO))

Martin_ATLAS_SusyStrong.pdf

210 Searches for electroweak production of supersymmetric particles with the ATLAS detector

The direct production of electroweak SUSY particles, including sleptons, charginos, and neutralinos, is a particularly interesting area with connections to dark matter and the naturalness of the Higgs mass. The small production cross sections lead to difficult searches, despite relatively clean final states. This talk will highlight the most recent results of searches performed by the ATLAS experiment for supersymmetric particles produced via electroweak processes, including analyses targeting small mass splittings between SUSY particles. Models are targeted in both R-parity conserving as well as R-parity violating scenarios.

Speaker: Eric Ballabene (Università degli Studi e INFN Milano (IT))

EWK-SUSY-EricBallabene.pdf

211 Multiboson measurements at CMS

Measurements of processes involving multiboson final states constitute a precision test of the Standard Model. Moreover, discrepancies between theoretical predictions and experimental measurements could hint to new physics through the presence of anomalous gauge couplings. These processes are also dominant backgrounds for Higgs boson measurements, and searches for new particles with diboson final states. The most relevant CMS measurements at 13 TeV will be presented.

Speaker: Saptaparna Bhattacharya (Northwestern University (US))

Pheno2022.pdf

212 Measurements of V+jets production in CMS

The study of the associated production of vector bosons and jets constitutes an excellent environment to check numerous QCD predictions. Total and differential cross sections of vector bosons produced in association with jets have been studied at CMS. Differential distributions as a function of a broad range of kinematical observables are measured and compared with theoretical predictions. These processes play an important role in understanding QCD calculations, and they constitute an important source of background for Higgs boson production measurements, and searches for new particles.

Speaker: Duong Hai Nguyen (The State University of New York SUNY (US))

VplusJet_pheno22_v2_Duong_Nguyen.pdf

213 Probing the $\mathcal{O}(1/\Lambda^4)$ effects on Drell-Yan process at the LHC

We study the $\mathcal{O}(1/\Lambda^4)$ effects on Drell-Yan process within the framework of the Standard Model Effective Field Theory (SMEFT). By analysing the high energy behavior of the cross sections as functions of SMEFT expansion parameters $\{s,v^2\}/\Lambda^4$, we select operators with dominating contribution to the cross sections at higher scale. The dependence of the cross section on a large operator basis is then vastly reduced. We survey the sensitivity of different operators toward higher scales. We perform fits to the LHC data, as well as HL-LHC pseudo-data. We then discuss the impact of dimension-8 effects to the bounds on dimension-6 Wilson coefficients. The inclusion of both dimension-6 squared terms and dimension-8 terms has significant effects on the fits.

Speaker: Dr Yingsheng Huang (Northwestern University & Argonne National Laboratory)

DY-pheno.pdf

Theory II

Conveners: Seth Koren, Seth Koren

214 Holographic dilaton action: the a-term

Spontaneously broken conformal sectors are ubiquitous in model-building. Despite this, little is understood about the Lagrangian for the dilaton, the Goldstone boson of broken scale invariance. We investigate the higher-derivative terms in the dilaton action, focusing on the unique four-derivative term allowed by symmetry. This term is closely related to the famous a-theorem, and we argue it can actually be calculated in a holographic realization of spontaneously broken scale invariance. We also discuss implications for model building and dilaton phenomenology.

Speaker: Ameen Ismail

AI_pheno.pdf

215 U(1) Holography and a Continuum Dark Photon

We consider an Abelian gauge field in $(d+1)$-dimensional anti-de Sitter space (AdS). The gauge symmetry is Higgsed by a bulk scalar with symmetry breaking triggered from an ultraviolet brane that regulates the AdS boundary. We show that the bulk mass of the Higgs field controls whether the $d$-dimensional spectrum of the gauge field is a continuum, gapped continuum, or a discretuum. When the Higgs field has no bulk mass, the dual conformal field theory (CFT) has a non-conserved $U(1)$ current whose anomalous dimension is proportional to the square of the Higgs vacuum expectation value. Studying the theory around this point, we introduce a WKB approximation to compute the gauge field boundary action and find that the anomalous dimension of the $U(1)$ current runs logarithmically with energy.

As an application, we present a holographic model of a continuum dark photon in AdS$_5$. The mixing with the visible photon is computed exactly via dressing. We present a method for extrapolating existing dark photon bounds to a continuum dark photon.

Speaker: Ian Chaffey

Pheno_2022_Continuum_Dark_Photon_v4.pdf

216 A New Horizon in the Randall-Sundrum Phase Transition

Randall-Sundrum models are an attractive, extra-dimensional geometric solution to the hierarchy problem. Stabilization of these geometries is important to obtain relevant low-energy phenomenology. This also provides dynamics for early universe cosmology via motion of branes through a Radion potential. Although much is known about the dynamics close to the global minimum of the Radion potential, the configurations far away from the minimum are hard to study. In our work, we map out the stationary points of the Radion potential, considering an inflationary geometric ansatz, and provide a consistent dynamical picture of the early universe that serves to interpolate between the above stationary points, and remark on the nature of the Phase transition between them

Speaker: Bharath Sambasivam

BSambasivam-Pheno22.pdf

217 The spatial Functional Renormalization Group and Hadamard states on cosmological spacetimes

In this talk I will introduce a novel "spatial" variant of the Functional Renormalization Group (FRG) on Lorentzian signature globally hyperbolic spacetimes. The adaptation of the FRG technique (typically studied on Euclidean signature manifolds) to Lorentzian signature spacetimes features several new conceptual aspects, in particular that such a FRG must inevitably be quantum-state dependent and that it should be based on a Hadamard state. In this talk I will discuss a concrete implementation for scalar quantum fields on spatially flat Friedmann-Lemaitre spacetime, highlighting the universality of the renormalization group (RG) flow in the ultraviolet stemming from the Hadamard property, as well as the state-dependence of the flow in the infrared.

Speaker: Rudrajit Banerjee (University of Pittsburgh)

RB_Pheno2022.pdf

218 Simulating 3+1 Dimension Schwinger Pair Production with Quantum Computers

Real-time quantum simulation of quantum field theory beyond one spatial dimension is always challenging due to limited resources and the imperfect control of noises in the noisy intermediate-scale quantum era. In this work, we develop a novel algorithm and experimentally study the Schwinger effect in (3+1)D. The resource reduction is achieved by introducing several techniques, including background field method, dimension reduction, parity symmetry, etc. Our algorithm is tested on an IBM quantum computer with 5 qubits, where the observed pair production rate is consistent with the theoretical prediction within experimental errors. Our method paves the way towards exploring quantum simulation of other field theory questions beyond one spatial dimension.

Speaker: Bin Xu

BinXU_pheno.pdf

219 Generalized partial waves and bottom-up EFT

I will present the technique of constructing the generalized partial waves and the corresponding local operators. It implies the selection rules at loop level amplitudes. We can also formulate a bottom-up investigation of the tree-level UV origins of effective operators, which is helpful to phenomenological searches for heavy particle resonances.

Speaker: Minglei Xiao

j-basis.pdf

Wednesday, 11 May

Breakfast

Plenary Wednesday Early

Convener: Jure Zupan (University of Cincinnati)

220 New approaches to dark matter direct detection

Speaker: Yonatan Kahn (University of Illinois at Urbana-Champaign)

New Approaches to DM.pdf

221 Physics at the Forward Physics Facility

Speaker: Felix Kling (DESY)

22-05-11-FPF@Pheno.pdf

222 Gravitational waves and particle physics

Gravitational-wave (GW) detections have recently attracted much attention as the goal of many proposed future experiments. Focusing on the cosmological origins of GWs, such as inflation, phase transitions, and topological defects in the early universe, we will discuss GWs as possible probes of New Physics beyond the Standard Model.

Speaker: Nobuchika Okada

NobuOkada_PHENO_Plenary_2022.pdf

Coffee break

Plenary Wednesday Late

Convener: Stephen Martin

223 Conformal collider physics meets the LHC

Speaker: Ian James Moult (Massachusetts Inst. of Technology (US))

IanMoult_pheno_2022.pdf

224 New physics at colliders

Speaker: Michael Spannowsky (IPPP Durham)

Pheno_Spannowsky.pdf

225 Perspectives in particle physics

Speaker: David Kaplan

PHENO2022-David.pdf

PHENO2022.key