Experimental hints of lepton flavor non-universality in the decays of b-hadrons are an exciting sign of possible new physics beyond the Standard Model. Results from multiple experiments indicate that electrons, muons, and tau leptons may not be different only because of their masses. I will review the experimental situation of these “b-anomalies”, including recent developments and prospects...
This talk will review the role of the CKM matrix in governing meson-antimeson oscillations and CP violation in the Standard Model. Recent measurements of B_s oscillations and decays by LHCb, CMS, and ATLAS will be discussed in this context, as will be measurements of CP violation in B_d and B_u decays. The direct measurements of the CKM angle gamma (from decays produced by tree-level...
Flavor physics is addressing two complementary questions. First, what is the origin of the hierarchical flavor structure of the Standard Model quarks and leptons? Second, are there sources of flavor and CP violation beyond the Standard Model? I will discuss recent theoretical developments in this area, focusing mainly on the so-called "B-anomalies" -- persistent hints for the violation of...
HEP is funded essentially entirely with public funds. Since there are many organizations that wish to receive federal funds, it is imperative that the HEP community raise its visibility among the general public. However, outreach to the public has long been neglected by the HEP community. In this talk, I will discuss the importance of outreach. I will also describe some of the methods that...
Many have observed for organizations there is evidence to support the belief that their cultures are their destinies. During the summer of 2020, the DELTA-PHY initiative was launched in an effort for the APS to deliberate upon and if needed move to transform its culture. It does this by asking three key questions: (a.) What are the values of the APS? (b.) Aside from producing world-class...
Some of the open questions in fundamental physics can be addressed by looking at the distribution of matter in the Universe as a function of scale and time (or redshift). We can study the nature of dark energy, causing the accelerated expansion of the Universe. We can measure the sum of the neutrino masses, and potentially determine their hierarchy. We can test the standard model at energies...
The DAMIC experiment at SNOLAB uses thick, fully-depleted, scientific grade charge-coupled devices (CCDs) to search for the interactions between proposed dark matter particles in the galactic halo and the ordinary silicon atoms in the detector. DAMIC CCDs operate with an extremely low instrumental noise and dark current, making them particularly sensitive to ionization signals expected from...
In this talk, we will introduce a technique to train neural networks into being good event variables, which are useful to an analysis over a range of values for the unknown parameters of a model.
We will use our technique to learn event variables for several common event topologies studied in colliders. We will demonstrate that the networks trained using our technique can mimic powerful,...
GAMBIT (the Global and Modular Beyond-the-standard-model Inference Tool) is a flexible and extensible framework that can be used to undertake global fits of essentially any BSM theory to relevant experimental data sets. Currently included in code are results from collider searches for new physics, cosmology, neutrino experiments, astrophysical and terrestrial dark matter searches, and...
Experimentally probing the charm-Yukawa coupling in the LHC experiments
is important, but very challenging due to an enormous QCD background. We study a new channel that can be used to search for the Higgs decay $H\to c\bar c$, using the vector boson fusion (VBF) mechanism with an associated photon. In addition to suppressing the QCD background, the photon gives an effective trigger handle....
Measurements of Higgs boson production cross sections are carried out in the diphoton decay channel using 139 $fb^{-1}$ of $pp$ collision data at $\sqrt{s}=$13 TeV collected by the ATLAS experiment. Cross-sections for gluon fusion, weak vector boson fusion, associated production with a $W$ or $Z$ boson, and top quark associated production processes are reported. An upper limit of eight times...
A Left-Right Symmetric Model which utilizes VLFs to generate fermion masses via a universal see-saw mechanism is studied. In this talk, I will present the latest results of our analysis on the flavor observables constraining the model. Cabibbo anomaly can be easily resolved in this model, thereby predicting the mass of vector-like quarks. Further, I will discuss the possibility of explaining...
ProtoDUNE-SP and ProtoDUNE-DP DUNE's large scale single-phase and dual-phase prototypes of DUNEs far detector modules, operated at CERN Neutrino Platform. ProtoDUNE-SP has finished its Phase-1 running in 2020 and has successfully collected test beam and cosmic ray data. In this talk, I will discuss the first results on ProtoDUNE-SP Phase-1's physics performance and ProtoDUNE-DPs design and progress.
The CMS electromagnetic calorimeter (ECAL) of the Compact Muon Solenoid (CMS) is a high granularity lead tungstate crystal calorimeter operating at the CERN Large Hadron Collider. The ECAL is designed to achieve excellent energy resolution which is crucial for studies of Higgs boson decays with electromagnetic particles in the final state, as well as for searches for new physics involving...
It has long been known that the coarse-grained approximation to the black hole density of states can be computed using classical Euclidean gravity. In this talk I will present evidence for another entry in the dictionary between Euclidean gravity and black hole physics, namely that Euclidean wormholes describe a coarse-grained approximation to the energy level statistics of black hole...
The precision measurements of the properties of the Higgs boson are among the principal goals of the LHC Run-2 program. This talk reports on the measurements of the fiducial and differential Higgs boson production cross sections via Vector Boson Fusion with a muon, an electron, and two neutrinos from the decay of W bosons, along with the presence of two energetic jets in the final state. The...
SuperCDMS deploys cryogenic germanium and silicon detectors which are sensitive in both the athermal phonon and ionization channels to search for dark matter. In order to observe such a small potential signal, all background sources need to be well understood and then mitigated.
Low-background shielding was designed such that the environmental background is negligible compared to the...
The Dark Energy Spectroscopic Instrument (DESI) has embarked on an ambitious survey to explore the nature of dark energy with spectroscopic measurements of 35 million galaxies and quasars in just five years. DESI will determine precise redshifts and employ the Baryon Acoustic Oscillation method to measure distances from the local universe to beyond 11 billion light years, as well as employ...
The CMS electromagnetic calorimeter (ECAL) is a high resolution crystal calorimeter operating at the CERN LHC. The on-detector readout electronics digitizes the signals and provides information on the deposited energy in the ECAL to the hardware-based Level-1 trigger system. The L1 trigger system receives information from different CMS subdetectors at 40 MHz, the proton bunch collision rate,...
We investigate the prospects of discovering the top quark decay into
a charm quark and a Higgs boson ($t \to c h^0$) in top quark pair
production at the CERN Large Hadron Collider (LHC).
A general two Higgs doublet model is adopted to study flavor changing
neutral Higgs (FCNH) interactions.
We perform a parton level analysis as well as Monte Carlo simulations
using \textsc{Pythia}~8 and...
Large liquid argon time projection chambers (LAr TPCs) at SBN and DUNE will provide an unprecedented amount of information about GeV-scale neutrino interactions. By taking advantage of the excellent tracking and calorimetric performance of LAr TPCs, we present a novel method for estimating the neutrino energy in neutral current interactions that significantly improves upon conventional methods...
A search is presented for chargino pair-production and chargino-neutralino production, where the almost mass-degenerate chargino and neutralino each decay via $R$-Parity-violating couplings to a boson ($W/Z/H$) and a charged lepton or neutrino. This analysis searches for a trilepton invariant mass resonance in data corresponding to an integrated luminosity of 139 fb$^{-1}$ recorded in...
The measurements at the Large Hadron Collider(LHC), so far, have established Higgs Yukawa couplings to Fermions are close to the Standard Model(SM) expectation for the 3rd Fermion generation. However, the rather ad hoc assumption of universal Yukawa coupling for other Fermion generations has a little experimental constraint. This is very challenging to probe due to small branching fractions,...
The discovery of a Higgs boson with mass near 125 GeV in 2012 marked one of the most important milestones in particle physics. The low mass of this Higgs boson with diverging loop corrections adds motivation to look for new physics Beyond the Standard Model (BSM). Several BSM theories introduced new heavy quark partners, called vector-like quarks (VLQ), with mass at the TeV scale. In...
Automated tools for the computation of amplitudes and cross sections have become the backbone of phenomenological studies beyond the standard model. We present the latest developments in MadDM, a calculator of dark matter observables based on MadGraph5_aMC@NLO. The new version enables the fully automated computation of loop-induced annihilation processes, relevant for indirect detection of...
To perform theoretical calculations and comparisons with collider data, it must first be corrected for various detector effects, namely noise processes, detector acceptance, detector distortions, and detector efficiency; this process is called “unfolding” in high energy physics (or “deconvolution” elsewhere). While most unfolding procedures are carried out over only one or two binned...
We will discuss constructions of string-inspired higher-derivative non-local extension of particle theory which is explicitly ghost-free. Showing quantum loop calculations in the weak perturbation limit we explore the implications on the hierarchy problem and vacuum instability problem in Higgs theory. Then we will discuss the abelian and non-abelian model-building in infinite derivative QFT...
Vector-like quarks (VLQ) are predicted in many extensions to the Standard Model (SM), especially those aimed at solving the hierarchy problem. Their vector-like nature allows them to extend the SM while still being compatible with electroweak sector measurements. In many models, VLQs decay to a SM boson and to a third-generation quark. Pair production of VLQ provides a model-independent method...
The Dark Energy Spectroscopic Instrument (DESI) started its main survey. Over 5 years, it will measure the spectra and redshifts of about 35 millions galaxies and quasars over 14,000 square degrees. This 3D map will be used to reconstruct the expansion history of the universe up to z=3.5, and measure the growth rate of structure in the redshift range 0.7-1.6 with unequaled precision. The start...
The WIMP proposed here yields the observed abundance of dark matter, and is consistent with the current limits from direct detection, indirect detection, and collider experiments, if its mass is $\sim 72$ GeV/$c^2$. It is also consistent with analyses of the gamma rays observed by Fermi-LAT from the Galactic center (and other sources), and of the antiprotons observed by AMS-02, in which the...
We examine the problem of unfolding in particle physics, or de-corrupting observed distributions to estimate underlying truth distributions, through the lens of Empirical Bayes and deep generative modeling. The resulting method, Neural Empirical Bayes (NEB), can unfold continuous multi-dimensional distributions, in contrast to traditional approaches that treat unfolding as a discrete linear...
We derive an expression for the one-loop determinant of the massive vector field in the Anti-de Sitter black brane geometry with large dimension limit. We utilize the Denef, Hartnoll and Sachdev method, which constructs the one-loop determinant from the quasinormal modes of the field. The large dimension limit decouples the equations of motion for different field components, and also selects a...
The dimuon decay of the Higgs boson is the most promising process for probing the Yukawa couplings to the second generation fermions at the Large Hadron Collider (LHC). We present a search for this important process using the data corresponding to an integrated luminosity of 139 fb$^{-1}$ collected with the ATLAS detector in $pp$ collisions at $\sqrt{s} = 13 \mathrm{TeV}$ at the LHC. Events...
A search for production of the supersymmetric partners of the top quark, top squarks, is presented. The search is based on proton-proton collision events containing multiple jets, no leptons, and large transverse momentum imbalance. The data were collected with the CMS detector at the CERN LHC at a center-of-mass energy of 13 TeV, and correspond to an integrated luminosity of 137 fb-1. The...
The Deep Underground Neutrino Experiment (DUNE) is an upcoming long-baseline neutrino experiment which will study neutrino oscillations. Neutrino oscillations will detected at the DUNE far detector 1300 km away from the start of the beam at Fermilab. The DUNE near detector (ND) will be located on-site at Fermilab, and will be used to provide an initial characterization of the neutrino beam, as...
The Large Hadron Collider (LHC) is a “top quark factory”. It allows for precise measurements of several top quark properties. In addition to this, for the first time ever it is now possible to measure rare processes involving top quarks. Associated production of top and anti-top quarks along with the Higgs boson or with electro-weak gauge bosons like W or Z has been observed at the LHC....
Variable Importance is a variable ranking framework that uses machine learning methods, such as neural networks, to construct a quantitative metric for characterizing a variable's discriminatory power in binary classification problems. The Variable Importance framework is presented in the context of the CMS search for the rare Standard Model process of three top quark production to the single...
We present the status of our all-hadronic analysis in search of pair-produced Vector-Like Quarks (VLQs) using the Boosted Event Shape Tagger (BEST) with the CMS detector using 137 $fb^{-1}$ of $\sqrt{s} = 13$ TeV proton-proton collisions at the LHC. VLQs are motivated by models which predict compositeness of the scalar Higgs boson, and which avoid increasing constraints from Higgs...
We present the theoretical case along with some early measurements with diamond test chips that demonstrate the viability of TES on diamond as a potential platform for direct detection of sub-GeV dark matter.
Diamond targets can be sensitive to both nuclear and electron recoils from dark matter scattering in the MeV and above mass range, as well as to absorption processes of dark matter with...
Following the discovery of the Higg's boson in 2012 by both the ATLAS and CMS experiments, a wealth of papers have been published concerning measurements or observations of the Higgs' decay modes. However, the most dominant decay mode, $H \rightarrow b\bar{b}$, proved to be an elusive and challenging search due to the low signal-to-background environment, and a diverse range of backgrounds...
As the search for physics beyond the Standard Model widens, 'model-agnostic' searches, which do not assume any particular model of new physics, are increasing in importance. One promising model-agnostic search strategy is Classification Without Labels (CWoLa), in which a classifier is trained to distinguish events in a signal region from similar events in a sideband region, thereby learning...
To address the challenges of providing high performance calorimetry and other types of instrumentation in future experiments under high luminosity and difficult radiation and pileup conditions, R&D is being conducted on promising optical-based technologies that can inform the design of future detectors, with emphasis on ultra-compactness, excellent energy resolution and spatial resolution, and...
Generic arguments lead to the idea of a minimal length scale in quantum gravity. An observational signal of such a minimal length scale is that photons would exhibit dispersion. In 2009, the observation of a short gamma ray burst seemed to push the minimal length scale to distances smaller than the Planck length. This poses a challenge for minimal length models. Here we propose a modification...
We present a search for the standard model four top quark (tttt) production in the single-lepton final state. We analyze the proton-proton collision data collected by the CMS experiment at center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.8 $fb^{-1}$ in 2016, 41.5 $fb^{-1}$ in 2017 and 59.97 $fb^{-1}$ in 2018. The single lepton final state features a high jet...
The Higgs Boson is expected to decay to bb approximately 58% of the time. Despite the large branching fraction, due to the large background from Standard Model events with b-jets, measuring this decay has been less precise than other, less frequent, decays. Measuring H(bb) in the vector boson fusion production mode has historically been insensitive, but developments in the background estimates...
With several recent anomalies observed that are in tension with the Standard Model, and with no clear roadmap to the source of new physics, this is an exciting time to explore for new particles at the LHC. Supersymmetry (SUSY) is an elegant solution to many of the Standard Model mysteries, and SUSY models with electroweakly produced sparticles are particularly interesting as possible...
In order to achieve a precise measurement of the leptonic CP violation phase, Deep Underground Neutrino Experiment (DUNE) will employ four 10 kt scale far detector modules and a near detector complex.
In the near detector complex, a System for on-Axis Neutrino Detection (SAND) is located downstream of a liquid-argon TPC (LAr) and a high pressure gaseous-argon TPC (GAr). SAND consists of an...
If dark matter interacts too feebly with ordinary matter, it was not able to thermalize with the bath in the early universe. Such Feebly Interacting Massive Particles (FIMPs) would therefore be produced via the freeze-in mechanism. Testing FIMPs is a challenging task, given the smallness of their couplings. In this talk, I will discuss our recent proposal of a $Z’$ portal where freeze-in can...
Excursion is a tool to efficiently estimate level sets of
computationally expensive black box functions using Active Learning.
Excursion uses a Gaussian Process Regression as a surrogate model for
the black box function. It queries the target function (black box) iteratively in order to increase the available information regarding the desired level sets. We implement Excursion using...
Dark, chiral fermions carrying lepton flavor quantum numbers are natural candidates for freeze-in. Small couplings with the Standard Model fermions of the order of lepton Yukawas are ‘automatic’ in the limit of Minimal Flavor Violation. In the absence of total lepton number violating interactions, particles with certain representations under the flavor group remain absolutely stable. For...
The quantization of Einsteins's general relativity leads to a nonrenormalizable quantum field theory. However, the potential harm of nonrenormalizability, can be overcome in the effective field theory (EFT) framework, where there is an unambiguous way to define a well behaved and reliable quantum theory of gravitation, if only we agree to restrict ourselves to low energies compared to the...
We discuss heavy-flavor production in modern global QCD analyses to determine the structure of the proton. We discuss new factorization schemes in presence of heavy quarks in proton-proton collisions, as well as the impact of the latest charm and bottom production at HERA and top-quark pair production at the LHC on recent PDF analyses from CTEQ.
ABSTRACT:
HeRALD, the Helium Roton Apparatus for Light Dark Matter, will use a superfluid 4He target to probe the sub-GeV dark matter parameter space. The HeRALD design is sensitive to all signal channels produced by nuclear recoils in superfluid helium: singlet and triplet excimers, as well as phonon-like excitations of the superfluid medium. Excimers are detected via calorimetry with...
In this talk I will present results of the simulation of electroweak Higgs boson production at the CERN LHC using the Herwig 7 general purpose event generator using one-loop matrix elements via the interface to HJets. The main result will be the simulation of next-to-leading order merging of Higgs boson plus 2 and 3 jets with a dipole parton shower. Additionally, I will comment on...
The XENON collaboration has recently published results lowering the energy threshold to search for nuclear recoils produced by solar $^8$B neutrinos using a $0.6$ tonne-year exposure with the XENON1T detector. Due to the low energy threshold, a number of novel techniques are required to reduce the consequent increase in backgrounds. No significant $^8$B neutrino-like excess is found after...
In many models that address the naturalness problem, top-quark partners are often postulated in order to cure the issue related to the quadratic corrections of the mass of the Higgs boson. In this work, we study alternative modes for the production of top- and bottom-quark partners ($T$ and $B$), $pp\rightarrow B$ and $pp\rightarrow T\bar{t}$, via a chromo-magnetic moment coupling. We adopt...
The ever-growing interest into high-energy production of the Higgs boson, motivated by an enhanced sensitivity to New Physics scenarios, pushes the development of experimental techniques for the reconstruction of boosted decay products from the Higgs-boson hadronic decays.
This talk will discuss recent studies of inclusive Higgs-boson production with sizable transverse momentum decaying to a...
Minimal Supersymmetric Standard Model (MSSM) is one of the most well-motivated and well-studied scenarios for going beyond the Standard Model (SM). Apart from solving the hierarchy problem, one of the primary motivations is the presence of a suitable dark matter (DM) candidate, namely the lightest neutralino, in the particle spectrum of SUSY. Measurement of DM relic density of the universe by...
A challenge in large LArTPCs is efficient photon collection for low energy, MeV-scale, deposits. Past studies have demonstrated that augmenting traditional ionization-based calorimetry with information from the scintillation signals can greatly improve the precision of measurements of energy deposited. We propose the use of photosensitive dopants to efficiently convert the scintillation...
Absorption of dark matter (DM) allows direct detection experiments to probe a broad range of DM candidates with masses much smaller than kinematically allowed via scattering. It has been known for some time that for vector and pseudoscalar DM the absorption rate can be related to the target's optical properties, i.e. the conductivity/dielectric. However this is not the case for scalar DM,...
The recently updated measurement of the muon anomalous magnetic moment strengthens the motivations for new particles beyond the Standard Model. We discuss two well-motivated 2HDM scenarios with vectorlike leptons as well as the Standard Model extended with vectorlike lepton doublets and singlets as possible explanations for the anomalous measurement. In these models we find that, with...
The top quark pair production cross-section is measured in proton-proton and lead-lead collisions at a center-of-mass energy of 5.02 TeV. The data, collected in 2017 and 2018 by the CMS experiment at the LHC, correspond to a proton-equivalent integrated luminosity of 304 and 78 pb$^{-1}$, respectively. The measurements are performed using events with one electron and one muon of opposite sign,...
The “muon-to-electron conversion” (Mu2e) experiment at Fermilab will search for the Charged Lepton Flavour Violating neutrino-less coherent conversion of a muon into an electron in the field of an aluminum nucleus. The observation of this process would be the unambiguous evidence of physics beyond the Standard Model. Mu2e detectors comprise a straw-tracker, an electromagnetic calorimeter and...
Data Quality Monitoring (DQM) is an important process of collecting high quality data for physics analysis. Currently, the workflow of DQM is manpower intensive to scrutinize and certify hundreds of histograms. Identifying good quality and reliable data is necessary to make accurate predictions, simulations, therefore anomalies in the detector must be timely identified to minimize data loss....
A search for supersymmetry involving the pair production of gluions decaying via stop quarks into the lightest neutralino $\tilde{\chi}^{0}_{1}$ is reported. It uses LHC $pp$ collision data at $\sqrt{s}\ =\ 13\ TeV$ with an integrated luminosity of $139fb^{-1}$ collected with the ATLAS detector in 2015-2018. The search is performed in events containing large missing transverse momentum and...
A search for the Standard Model Higgs boson produced in association with a high-energy photon is performed using ${132}$ ${fb^{-1}}$ of $pp$ collision data at $\sqrt{s}={13}$ TeV collected with the ATLAS detector at the Large Hadron Collider. The vector boson fusion production mode of the Higgs boson is particularly powerful for studying the $H(\rightarrow b \bar{b})\gamma$ final state because...
With the standard model working well in describing the collider data, the focus is now on determining the standard model parameters as well as for any hint of deviation. In particular, the determination of the couplings of the Higgs boson with itself and with other particles of the model is important to better understand the electroweak symmetry breaking sector of the model. In this
letter,...
We present a phenomenological investigation of color-octet
scalars (sgluons) in supersymmetric models with Dirac gaugino masses that feature an explicitly broken $R$ symmetry ($R$-broken models). We have constructed such models by augmenting minimal $R$-symmetric models with a set of supersymmetric and softly supersymmetry-breaking operators that explicitly break $R$ symmetry. We have found...
The upgrade of the Mu2e experiment at Fermilab, Mu2e-II, is proposed to improve the expected Mu2e sensitivity. Mu2e-II will search for the neutrinoless conversion of a muon into an electron in the field of an Al nucleus, with a sensitivity up to few 10$^{-18}$.
As for Mu2e, the tracker system for the Mu2e-II will be responsible for precisely measuring the momentum of the conversion electron...
NOvA is a long-baseline neutrino oscillations experiment designed to precisely measure the neutrino oscillation parameters. We do this by directing a beam of predominantly muon neutrinos from Fermilab towards northern Minnesota to measure the rate of electron-neutrino appearance. The experiment consists of two functionally equivalent detectors each located 14.6 mrad off the central axis of...
Application of machine learning methods in high energy physics has received tremendous success in recent years with rapidly growing use cases. A key aspect in improving the performance of a given machine learning model has been the optimization of its hyperparameters which is usually computationally expensive. A framework has been developed to provide a high-level interface for automatic...
In this talk, we correct previous work on magnetic charge plus a photon mass. We show that contrary to previous claims this system has a very simple, closed form solution which is the Dirac string potential multiplied by a exponential decaying part. Interesting features of this solution are discussed namely: (i) the Dirac string becomes a real feature of the solution; (ii) the breaking of...
Current measurements of Standard-Model parameters suggest that the electroweak vacuum is metastable. This metastability has important cosmological implications because large fluctuations in the Higgs field could trigger vacuum decay in the early universe. For the false vacuum to survive, interactions which stabilize the Higgs during inflation---e.g., inflaton-Higgs interactions or non-minimal...
There is a significant gap between the inclusive measurement of the $B \rightarrow X_{c} l \nu$ branching fraction and the sum of the measurements of the exclusive $B \rightarrow X_{c} l \nu$ channels. The dominant contributions $B \rightarrow D^{*} l \nu$ and $B \rightarrow D l \nu$ are precisely known but the branching fractions of $B \rightarrow D^{**} l \nu$ have higher uncertainties....
A search for resonant Higgs boson pair production in the four b-jet final state is conducted. The analysis uses 36 fb$^{-1}$ of pp collision data at $\sqrt{s}$ = 13 TeV collected with the ATLAS detector. The analysis is divided into two regimes, targeting Higgs boson decays which are reconstructed as pairs of b-tagged small-radius jets or as single large-radius jets associated with b-tagged...
The cold dark matter (CDM) candidate with weakly interacting massive
particles can successfully explain the observed dark matter relic
density in cosmic scale and the large-scale structure of the Universe.
However, a number of observations at the satellite galaxy scale seem
to be inconsistent with CDM simulation.
This is known as the small-scale problem of CDM.
In recent years, it has...
The Higgs boson could provide the key to discover new physics at the Large Hadron Collider. We investigate novel decays of the Standard Model (SM) Higgs boson into leptophobic gauge bosons which can be light in agreement with all experimental constraints. We study the associated production of the SM Higgs and the leptophobic gauge boson that could be crucial to test the existence of a...
The $\eta$ and $\eta'$ mesons are almost unique in the particle universe since they are Goldstone boson and the dynamics of their decay are strongly constrained. The integrated eta meson samples collected in earlier experiments have been about ~$10^9$ events, dominated by the WASA at Cosy experiment, limiting considerably the search for such rare decays. A new experiment, REDTOP, is being...
The XENONnT experiment has made great commissioning strides in the last year. Operating at the INFN Gran Sasso National Laboratory in Italy, XENONnT has substantially improved upon its predecessor, XENON1T, which to date is the most sensitive direct-detection dark-matter experiment for spin-independent WIMPs above 6 GeV/c^{2}. As part of its multi-pronged physics program, XENONnT aims to reach...
The intelligent Data Delivery Service (iDDS) has been developed to cope with the huge increase of computing and storage resource usage in the coming Large Hadron Collider (LHC) data taking. It has been designed to intelligently orchestrate workflow and data management systems, decoupling data pre-processing, delivery, and main processing in various workflows. It is an experiment-agnostic...
The searches for permanent Electric Dipole Moments (EDMs) of elementary particles constitute one of the most powerful tools to probe physics beyond the Standard Model (SM). The existence of EDM can provide an explanation of the dominance of matter over antimatter in the universe which still is considered as one of the most puzzling questions in physics.
The JEDI Collaboration is...
We explore the implications of supersymmetric grand unified theories about the muon anomalous magnetic moment (muon g-2). The discrepancy between the Standard Model (SM) prediction and the experiments in muon g-2 can be resolved by the contributions from the supersymmetric particles, and the fundamental parameter space of the muon g-2 resolution typically favors light sleptons (<~ 800 GeV),...
We explore the implications of $g_\mu-2$ new result to five models based on the $SU(3)_C×SU(3)_L×U(1)_N$ gauge symmetry and put our conclusions into perspective with LHC bounds. We show that previous conclusions found in the context of such models change if there are more than one heavy particle running in the loop. Moreover, having in mind the projected precision aimed by the $g_\mu-2$...
I will present the Sejong Suite, an extensive collection of state-of-the-art high-resolution cosmological hydrodynamical simulations spanning a variety of cosmological and astrophysical parameters, primarily developed for modeling the Lyman-Alpha forest and the high-redshift cosmic web. Adopting a particle-based implementation, we follow the evolution of gas, dark matter (cold and warm),...
The Inner Tracker is an all-silicon detector that will replace ATLAS’ inner tracking layers for the High Luminosity LHC. SLAC National Accelerator Laboratory is responsible for the loading and integration of the pixel layers closest to the LHC Beamline, the Inner System. We’ll mount the silicon pixel detectors on their mechanical supports, then connect the loaded mechanical supports (“loaded...
The Scintillating Bubble Chamber (SBC) is a rapidly developing new technology for 0.7 - 7 GeV nuclear recoil detection. Demonstrations in liquid xenon at the few-gram scale have confirmed that this technique combines the event-by-event energy resolution of a liquid-noble scintillation detector with the world-leading electron-recoil discrimination capability of the bubble chamber, and in fact...
Quantum field theories generally contain small quantum excitations around a true vacuum that we call particles and large classical structures called solitons that interpolate between different degenerate vacua. Often the solitons have a topological character and are then also known as topological defects of which kinks, domain walls, strings, and magnetic monopoles are all examples. After a...
We report the first search of CP violation using T-odd triple product asymmetries and the most precise branching fraction measurement for the singly Cabibbo suppressed decay $D^{0}\rightarrow K_{s}^{0} K_{s}^{0} \pi^{+} \pi^{-}$. These results will be obtained using $922\,{\rm fb}^{-1}$ data sample that was collected with the Belle detector at the KEKB asymmetric energy $e^+ e^-$ collider. The...
We present a search for non-resonant di-Higgs production in the $HH\rightarrow b\bar{b}\gamma\gamma$ decay channel. The measurement uses 139 $\mathrm{fb}^{-1}$ of pp collisions recorded by the ATLAS experiment at a center-of-mass energy of 13 TeV. Selected events are separated into multiple regions, targeting both the Standard Model (SM) signal and Beyond Standard Model (BSM) signals with...
NOvA is a long-baseline neutrino experiment optimized to observe the oscillation of muon neutrinos to electron neutrinos. It uses a high purity muon neutrino beam produced at Fermilab with central energy of approximately 1.8 GeV. NOvA consists of a near detector located 1 km downstream of the neutrino production target at Fermilab and a far detector located 810 km away in Ash River, Minnesota....
Clockwork models can explain the flavor hierarchies in the Standard Model quark and lepton spectrum. We construct supersymmetric versions of such flavor clockwork models. The zero modes of the clockwork are identified with the fermions and sfermions of the Minimal Supersymmetric Standard Model. In addition to generating a hierarchical fermion spectrum, ...
In a particle theory model whose most readily discovered new particle is the $\sim 1$TeV bilepton resonance in same-sign leptons, currently being sought at CERN's LHC, there exist three quarks ${\cal D, S, T}$ which will be bound by QCD into baryons and mesons. We consider the decays of these additional baryons and mesons whose detailed experimental study will be beyond the reach of the 14...
Dark matter self-interactions have been proposed as a solution to various astrophysical small-scale structure anomalies. We explore the scenario in which dark matter self-interacts through a continuum of low-mass states. This happens if dark matter couples to a strongly-coupled nearly-conformal hidden sector. This type of theory is holographically described by brane-localized dark matter...
The Scintillating Bubble Chamber (SBC) Collaboration is constructing a 10-kg liquid argon bubble chamber with scintillation readout. The goal for this new technology is to achieve a nuclear recoil detection threshold as low as 100 eV with near complete discrimination against electron recoil events. Following initial characterization in a near-surface site at Fermilab, an underground deployment...
We study flavor–conserving M1 radiative decays of heavy flavor bottom baryons in the framework of Effective Mass Scheme (EMS) within the quark model. The intent of the EMS lies in the fact that the masses of the quarks inside the baryon are modified as a consequence of one-gluon exchange interaction with the spectator quarks and it treats all the quarks at the same footing. The baryon mass can...
After the Higgs Boson, with a mass of 125 GeV, was discovered in 2012, studies of single Higgs boson production have largely confirmed that this particle has similar properties to the Higgs boson predicted by the Standard Model (SM). However, it is clear that physics beyond the SM is required to explain many observed phenomena in nature, and there remains the possibility that the Higgs Boson...
The REDTOP experiment aims at collecting more than $10^{13}$ $\eta$/yr and $10^{11}$ $\eta'$/yr for studying rare meson decays.
Such large statistics provide the base for the investigation of several discrete symmetries, and the search for particles beyond the Standard Model.
The physics program and the ongoing sensitivity studies will be discussed during the presentation.
A method to construct the asymptotic eigenstates of two-dimensional adjoint QCD in all parton sectors is described. It is used to explain known properties of the spectrum of QCD$_{2A}$, as well as the basis of a numerical approach to tackle the full theory. First results in a discrete approximation and a continuous formulation are presented. Prospects to uncover the true single-particle...
NOvA (NuMI Off-Axis ve Appearance) is a long-baseline oscillation neutrino experiment composed by two functional identical detectors, a 300 ton Near Detector and a 14 kton Far Detector separated by 809 km and placed 14 mrad off-axis to the NuMI neutrino beam created at Fermilab. This configuration enables NOvA's rich neutrino physics program, which includes measuring neutrino mixing...
The inner tracking detector of the ATLAS experiment at CERN is currently preparing for an upgrade to operate in the high Luminosity LHC, scheduled to start in 2027. A complete replacement of the existing Inner Detector of ATLAS is required to cope with the expected radiation damage. The all-silicon Inner Tracker (ITk) design under construction composes a mixture of Pixel and Strips layers. At...
The axion is a well-motivated candidate for the inflaton, as the radiative corrections that spoil many single-field models are avoided by virtue of its shift symmetry. However, axions generically couple to gauge sectors. As the axion rolls through its potential, this coupling can result in the production of a co-evolving thermal bath, a situation known as "warm inflation." Inflationary...
We present measurements of the branching fractions and $CP$ asymmetries for $D_s^{+} \rightarrow K^{+} \eta $, $D_s^{+} \rightarrow K^{+} \pi^0 $, and $D_s^{+} \rightarrow \pi^{+} \eta $ decays, and the branching fraction for $D_s^{+} \rightarrow \pi^{+} \pi^0$ based on the full data sample collected by the Belle detector at the KEKB $e^+e^-$ asymmetric-energy collider. No evidence for $CP$...
NOvA is a long-baseline neutrino experiment based at Fermilab that studies neutrino oscillation parameters via electron neutrino appearance and muon neutrino disappearance. In these measurements, we compare the Far Detector data to a predicted energy spectrum constrained by the Near Detector (ND) data. The ND data is simulated using GENIE, with the neutrino cross section model adjusted to...
The Upstream Tracker (UT) is a silicon tracking sub-detector currently under construction that will sit just upstream of LHCb's dipole magnets during Run III of the LHC. It improves on the previous tracker in several ways, including enabling LHCb's new 40 MHz fully-software trigger, and comprises 968 silicon sensors mounted in four planes together with their requisite readout electronics and...
Though collider searches are constraining supersymmetric parameter space, generic model independent bounds on sneutrinos remain very low. We calculate new model independent lower bounds on general supersymmetric scenarios with sneutrino LSP and NLSPs. By recasting ATLAS LHC exotic searches in mono boson channels, we place an upper bound on the cross section on...
The Gamma Factory is a proposal to back-scatter laser photons off a beam of partially-stripped ions at the LHC, producing a beam of $\sim 10$ MeV to $1$ GeV photons with intensities of $10^{16}$ to $10^{18}~\text{s}^{-1}$. This implies $\sim 10^{23}$ to $10^{25}$ photons on target per year, many orders of magnitude greater than existing accelerator light sources and also far greater than all...
Recently, there has been great interest in beyond-the-Standard Model (BSM) physics involving new low-mass matter and mediator particles. One such model, $U(1)_{T3R}$, proposes a new U(1) gauge symmetry under which only right-handed fermions of the standard model are charged, as well as the addition of new vector-like fermions (e.g., $\chi_t$) and a new dark scalar particle ($\phi$) whose...
I will discuss dark matter production mechanism based on decays of a messenger WIMP-like state into a pair of dark matter particles that are self-interacting via exchange of a light, stable mediator. A natural by-product of this mechanism is a possibility of a late time transition to subdominant dark radiation component which increases the present-day Hubble rate. Simple realization of the...
Precision measurements of Higgs boson couplings to SM particles is a central task at the LHC today and for the future HL-LHC. Due to the $\sim$ O(nb) $t\bar{t}$ cross section and large Yukawa coupling, measurements of the interaction of the Higgs with top quarks is particularly compelling. The $t\bar{t}HH$ signal can be used to probe this coupling and also provides a direct measurement of...
The detection of low mass dark matter is under development with the advancement of experiment techniques. The superfluid helium-4 detector covers an extensive detection range from DM mass keV to GeV among the setups. I will present a complete theoretical framework for all processes within the superfluid to fill in the missing theory for sub-GeV DM detection. First, we use effective field...
Non-topological solitons like Q-balls and Q-shells are fascinating field theory objects. They may also relate to what lies beyond the standard model such as, for instance, as a macroscopic dark matter candidate. I describe recent improvements in the analytic understanding of these objects, leading to accurate descriptions of their essential characteristics, like size, charge, and mass. I also...
Scenarios in which right-handed light Standard Model fermions couple to a new gauge group, $U(1)_{T3R}$ can naturally generate a sub-GeV dark matter candidate. But such models necessarily have large couplings to the Standard Model, generally yielding tight experimental constraints. We show that the contributions to $g_\mu-2$ from the dark photon and dark Higgs largely cancel out in the narrow...
We present two distinct models which rely on 1st order phase transitions in a dark sector. The first is a minimal model for baryogenesis which employs a new dark SU(2) gauge group with two doublet Higgs bosons, two lepton doublets, and two singlets. The singlets act as a neutrino portal that transfers the generated baryon asymmetry to the Standard Model. The model predicts extra relativistic...
We introduce CaloFlow, a fast detector simulation framework based on normalizing flows. For the first time, we demonstrate that normalizing flows can reproduce many-channel calorimeter showers with extremely high fidelity, providing a fresh alternative to computationally expensive GEANT4 simulations, as well as other state-of-the-art fast simulation frameworks based on GANs and VAEs. Besides...
NOvA is a long-baseline neutrino oscillation experiment, designed to make precision neutrino oscillation measurements using $\nu_\mu$ disappearance and $\nu_e$ appearance. It consists of two functionally equivalent detectors and utilizes the Fermilab NuMI neutrino beam. NOvA uses a convolutional neural network for particle identification of $\nu_e$ events in each detector. As part of the...
The Large Hadron Collider (LHC) will soon undergo an upgrade, referred to as the High-Luminosity LHC (HL-LHC), which will increase the instantaneous luminosity beyond the LHC's design value. The ATLAS experiment is upgrading the innermost portion of the detector to the ITk pixel detector to accommodate the increase in luminosity. The RD53 collaboration was formed to develop the ASIC read out...
In this work we study the collider phenomenology of color-octet scalars (sgluons) in minimal supersymmetric models endowed with a global continuous R symmetry. We systematically catalog the significant decay channels of scalar and pseudoscalar sgluons and identify novel features that are natural in these models. These include decays in nonstandard diboson channels, such as to a gluon and a...
A measurement of the $B_S^0\rightarrow J/\psi\phi$ decay parameters using $80~\mathrm{fb}^{-1}$ of integrated luminosity collected with the ATLAS detector from $13~\mathrm{TeV}$ proton-proton collisions at the LHC is presented. The measured parameters include the CP-violating phase $\phi_S$, the width difference $\Delta\Gamma_S$ between the $B_S^0$ meson mass eigenstates and the average...
A search for Higgs boson pair production in bbll+MET final state with the ATLAS experiment will be presented. The analysis uses the full Run~2 data-set (139fb−1) collected at the LHC in pp collisions at √s=13TeV. Di-Higgs boson production from the SM tri-Higgs-boson interaction and from BSM resonant decays are investigated with a final state containing two jets (one or two tagged as b-jets)...
A search is presented for new physics beyond the standard model, including versions of Supersymmetry characterized by R-parity Violating (RPV) and Stealth SUSY. The result of this search is in events with two top quarks, no extra transverse momentum, and many light flavor jets as a final state of the top squark. The Run2 data used were collected with the CMS detector at the LHC in 2016 to...
Recent theoretical calculations have shown that it is possible to
attempt the direct detection of dark matter in the laboratory through
its gravitational interaction alone. This is particularly relevant
around the well-motivated Planck mass scale (22 micro-g or $10^{19}$ GeV).
The Windchime collaboration is working on arrays of mechanical
accelerometers with quantum-enhanced readout to...
In Run 3 of the LHC (2022-2024), the Level-1 trigger system of the ATLAS experiment will introduce three feature extractors (FEX): eFEX for electron/photon, jFEX for jets/MET, and gFEX for global quantities. The increased calorimeter granularity is useful for all physics channels that deposit energy in the calorimeter, from high-bandwidth items like electrons to MET (missing transverse...
Many analyses in ATLAS rely on the identification of jets containing $b$-hadrons ($b$-jets) with high efficiency while rejecting more than 99% of non-$b$-jets. Identification algorithms, called $b$-taggers, exploit $b$-hadron properties such as their long lifetime, their high mass, and high decay multiplicity. Recently developed ATLAS $b$-taggers using neural networks are expected to...
Naturalness suggests that the masses of the lightest electroweak gauginos (electroweakinos) are near the electroweak scale and, as a result, are within the scope of current LHC searches. However, LHC searches have not yet provided evidence of any supersymmetric (SUSY) particles. While exclusion limits for SUSY particles have been commonly reported assuming a simplified model where the...
In a well-motivated class of beyond the Standard Model scenarios, dark matter interacts mainly with neutrinos of the SM via a neutrinophilic mediator. This scenario can leave a striking signature in neutrino detectors -- the mono-neutrino signature. In this process, invisible particles (either dark matter or the mediators) can be radiated off neutrinos when they undergo charged-current weak...
A non-Abelian $SU(2)_X$ gauge extension of the Standard Model is considered under which leptons carry non-trivial charge. Gauge anomaly cancellation requires additional vectorlike fermions, which along with neutral vector bosons that play the role of Dark Matter correct the muon and the electron anomalous magnetic moments as preferred by experiments. When Collider bounds, electroweak precision...
Higgs boson pair production (HH) is one of the more interesting processes to study at the LHC, as it allows us to probe Higgs Boson self-coupling and associated parameters of the Higgs potential, as well as search for physics beyond the standard model. The $b\bar{b}\tau\tau$ final state is one of the most sensitive channels for HH studies due to an appreciable branching ratio, and a relatively...
We put forth a technique to generate images of particle trajectories (particularly electrons and protons) in a liquid argon time projection chamber (LArTPC). LArTPCs are a type of particle physics detector used by several current and future experiments focused on studies of the neutrino. We implement a quantized variational autoencoder and an autoregressive model which produces images...
The NOvA experiment uses a convolutional neural network (CNN) that analyzes topological features to determine neutrino flavor. Alternative approaches to flavor identification using machine learning are being investigated with the goal of developing a network trained with both event-level and particle-level images in addition to reconstructed physical variables while maintaining the performance...
The Dark Energy Survey has observed large scale structure data in 5000 sq. deg in sky. This effort was done in collaboration with hundreds of scientists culminating in the more accurate and precise constraints to date on the cosmology of the late-time Universe.
In this talk, I discuss the methodology and measurements in the third year of the Dark Energy Survey. I review the results from the...
Twenty years ago, in an experiment at Brookhaven National Laboratory, physicists detected what seemed to be a discrepancy between measurements of the muon’s magnetic moment and theoretical calculations of what that measurement should be, raising the tantalizing possibility of physical particles or forces as yet undiscovered. The Fermilab team has just announced that their precise measurement...
The Deep Underground Neutrino Experiment (DUNE) is a next-generation long-baseline neutrino experiment. Its main physics goals are the precise measurement of the neutrino oscillation parameters, in particular the violation of the charge-parity symmetry and the neutrino mass hierarchy. DUNE consists of a Far Detector (FD) complex with four multi-kiloton liquid argon detectors, and a Near...
Ultralight axions (ULA), whose masses can lie in a wide range of values and can be even smaller than $10^{−28}$ eV, are generically predicted in UV theories such as string theory. In the cosmological context, the early Universe may have gotten filled with a network of ultralight axion (ULA) cosmic strings which, depending upon the mass of the axion, can survive till very late times. If the ULA...
We present measurements of CMS jet energy scale (JES) and resolutions, based on a data sample
collected in proton-proton collisions at a center-of-mass energy of 13 TeV. The corrections,
extracted from data and simulated events using the combination of several channels and methods,
account successively for the effects of pileup, simulated jet response, and residual JES eta and
pT...
The Axion Dark Matter Experiment (ADMX) is an experiment that searches for axions as dark matter with a resonant cavity in a strong magnetic field. In previous operations, ADMX achieved DFSZ sensitivity between 2.66-3.31 micro eV with yocto Watt level background using a quantum amplifier and dilution refrigerator. The latest operation has searched between 3.3 to 4.2 micro eV between October...
We present a search for dark matter candidates produced in association with a Higgs boson using data collected from $pp$ collision at $\sqrt{s}=13$ TeV with the ATLAS detector that corresponds to an integrated luminosity of 139 $fb^{-1}$. This search targets events that contain a large missing transverse momentum and a Higgs boson reconstructed either as two $b$-tagged small-radius jets or as...
Most searches for new physics at the Large Hadron Collider assume that a new particle produced in pp-collisions decays almost immediately or is non-interacting and escapes the detector. However, a variety of new physics models predict particles that decay inside the detector at a discernible distance from the interaction point. Such long-lived particles would create spectacular signatures that...
Many physics models beyond the Standard Model predict heavy new particles preferentially decaying to at least one top quark. Three searches for a heavy resonance decaying into at least one top quark in pp collision at a center-of-mass energy of 13 TeV at the LHC will be presented in the talk. These searches include: The search for a heavy resonance decaying to a top quark and a W boson in the...
The generation of the neutrino mass is an essential observation from the neutrino oscillation experiments. This indicates a major revision of the Standard Model which initiated with the massless neutrinos. A possible interesting scenario is the seesaw mechanism where SM gauge singlet Right Handed Neutrinos are introduced. Another interesting aspect is the extension of the SM with SU$(2)_𝐿$...
Athena is the software framework used in the ATLAS experiment throughout the data processing path, from the software trigger system through offline event reconstruction to physics analysis. The shift from high-power single-core CPUs to multi-core systems in the computing market means that the throughput capabilities of the framework have become limited by the available memory per process. For...
The challenging experimental environment at the High Luminosity LHC (HL-LHC) will require replacement of the existing endcap calorimeters of the CMS experiment. In their place, the new HGCAL detector will offer a radiation hard, high granularity calorimeter which meets the challenge and offers improved abilities for physics object reconstruction. We review the design and current status of the...
The constituents of dark matter are still unknown, and the viable possibilities span a very large mass range. Specific scenarios for the origin of dark matter sharpen the focus on a narrower range of masses: the natural scenario where dark matter originates from thermal contact with familiar matter in the early Universe requires the DM mass to lie within about an MeV to 100 TeV. Considerable...
We propose a model-independent framework to classify and study neutrino mass models and their phenomenology. The idea is to introduce one particle beyond the Standard Model which couples to leptons and carries lepton number together with an operator which violates lepton number by two units and contains this particle. This allows to study processes which do not violate lepton number, while...
The ongoing pandemic has exacerbated the isolation of people with disabilities, due to the loss of physical access to habilitation personnel and facilities. However, the elimination of business travel in favor of virtual meetings has simplified the participation of physically disabled scientists in the intellectual life of the particle physics community. In view of the imminent restart of...
A direct measurement of the Higgs self coupling is very crucial to understand the nature of electroweak symmetry breaking. This requires an observation of production of Higgs boson pair, which suffers from very low event rate even at the current LHC run. In our work, we study the prospects of observing the Higgs pair production at the high luminosity run of the 14 TeV LHC (HL-LHC) and also...
The ongoing CMS analysis on the measurement of the full spin density production matrix, which includes multi-differential measurements of variables sensitive to the top quark spin correlation, polarization and related angular observables, is presented. Events containing two leptons, two b-jets and additional jets, as well as missing transverse momentum produced in proton-proton collisions at a...
We present a novel implementation of classification using boosted decision trees (BDT) on field programmable gate arrays (FPGA). Two example problems are presented, in the separation of electrons vs. photons and in the selection of vector boson fusion-produced Higgs bosons vs. the rejection of the multijet processes. The firmware implementation of binary classification requiring 100 training...
A search for neutral long-lived particles decaying into displaced jets in the ATLAS hadronic calorimeter in $pp$ collisions at $\sqrt{s} = 13 \textrm{ TeV}$ during 2016 with data corresponding to $10.8 \textrm{ fb}^{-1}$ or $33.0 \textrm{ fb}^{-1}$ of integrated luminosity (depending on the trigger) is preserved in RECAST and thereafter used to constrain three new physics models not studied in...
Many beyond the Standard Model (BSM) theories suggest the existence of multiple fundamental scalar fields and associated Higgs bosons, with the standard model Higgs boson being the lightest and most easily discovered. The dimension-4 interactions between a theorized generic heavy Higgs boson and Standard Model (SM) particles have already been explored in all major Higgs boson production...
A search for dijet resonances in events with identified leptons has been performed using full Run 2 data collected in 𝑝𝑝 collisions at √s=13 TeV by the ATLAS detector, corresponding to an integrated luminosity of 139 𝑓𝑏−1. The dijet invariant-mass ($m_{jj}$) distribution from events with at least one isolated electron or muon was probed in the range of $0.22 < m_{jj} < 6.3$ TeV. The analysis...
The HL-LHC upgrade of the CMS experiment includes a replacement of the endcap calorimeters with the new HGCAL High-Granularity Calorimeter. Development of radiation-hard 8" silicon sensors is an important part of the upgrade project. We will review the status of the sensor development, including radiation tests, and describe the plans towards the full sensor production.
I will describe two precision experiments searching for ultralight axion-like dark matter. The SHAFT experiment uses ferromagnetic toroidal magnets, and is sensitive to the electromagnetic coupling in the 12 peV to 12 neV mass range. The CASPEr-e experiment is based on precision magnetic resonance, and is sensitive to the EDM and the gradient couplings in the 162-166 neV mass range. These two...
New theoretical developments have motivated “hidden sector” dark matter with mass below the proton mass. The Light Dark Matter Experiment (LDMX) will use an electron beam to produce dark matter in fixed-target collisions. A low current, high repetition rate (37.2MHz) electron beam extracted from SLAC’s LCLS-II will provide LDMX with sufficient luminosity to explore many dark matter candidates....
The ATLAS Collaboration has developed a variety of printables for education and outreach activities. We present two ATLAS Coloring Books, the ATLAS Fact Sheets, the ATLAS Physics Cheat Sheets, and ATLAS Activity Sheets. These materials are intended to cover key topics of the work done by the ATLAS Collaboration and the physics behind the experiment for a broad audience of all ages and levels...
We present our recent NNLO calculation of t-channel single-top-quark production and decay that resolves a disagreement between two previous calculations whose size at the inclusive level was comparable to the NNLO correction itself, and was even larger differentially. Moving beyond those comparisons, we have included b-quark tagging to allow for comparison with experiment, and added the...
Charged Higgs bosons produced either in top-quark decays or in association with a top-quark, subsequently decaying via $H^{\pm} \to \tau^{\pm}\nu_{\tau}$, are searched for in $36.1 \mathrm{fb^{-1}}$ of proton-proton collision data at $\sqrt{s}=13$ TeV recorded with the ATLAS detector. Depending on whether the associated top-quark decays hadronically or leptonically, the search targets...
Many theories beyond the Standard Model predict new phenomena, such as $Z'$ and vector-like quarks, in final states containing bottom- or top-quarks. It is challenging to reconstruct and identify the decay products and model the major backgrounds. Nevertheless, such final states offer great potential to reduce the Standard Model backgrounds due to their characteristic decay signature. The...
SPT-3G is the third survey receiver operating on the South Pole Telescope dedicated to high-resolution observations of the cosmic microwave background (CMB). Sensitive measurements of the temperature and polarization anisotropies of the CMB provide a powerful dataset for constraining the fundamental physics of the early universe, including models of inflation and the neutrino sector....
New physics beyond the Standard Model (SM) could be responsible for the presence of Dark Matter in the Universe. A hidden, or "dark", sector interacting with SM particles via new force carriers is a natural scenario to explain the features of Dark Matter. In the last decade, growing interest has been dedicated to the search for dark sectors with force carriers in the MeV-GeV mass range. A well...
We consider the generation of neutrino masses via a singly-charged scalar singlet. Under general assumptions we identify two distinct structures for the neutrino mass matrix which are realised in several well-known radiative models. Either structure implies a constraint for the antisymmetric Yukawa coupling of the singly-charged scalar singlet to two left-handed lepton doublets, irrespective...
The HGCAL endcap calorimeter of the CMS experiment at HL-LHC will include a hadronic compartment that is based partly on the SiPM-on-tile concept. Building a performant SiPM-on-tile system involves the development and testing of rad-hard scintillators and SiPMs to meet the challenges of the HL-LHC experimental environment. We will review the design of the SiPM-on-tile part of the calorimeter,...
Triggering long-lived particles (LLPs) at the first stage of the trigger system is very crucial in LLP searches to ensure that we do not miss them at the very beginning. The future High Luminosity runs of the Large Hadron Collider will have an increased number of pile-up events per bunch crossing. There will be major upgrades in hardware, firmware and software sides, like tracking at level-1...
In this talk we will discuss the production of three Higgs bosons in the LHC and at a proton-proton collider running at a centre-of-mass energy of 100 TeV. We will argue that the seemingly challenging 6-botton jets final state is a very good candidate to investigate triple Higgs production within and beyond the SM in proton-proton colliders. In particular we will consider three different...
One of the assumptions of simplified models is that there are a few new particles and interactions accessible at the LHC and all other new particles are heavy and decoupled. The effective field theory (EFT) method provides a consistent method to test this assumption. Simplified models can be augmented with higher order operators involving the new particles accessible at the LHC. Any UV...
T2K is a long-baseline accelerator neutrino oscillation experiment which has precisely measured neutrino oscillation parameters and hinted at a significant matter-antimatter asymmetry in the lepton sector. In view of the upcoming program of upgrades of the beam intensity, a novel plastic-scintillator detector for the T2K near detector upgrade, called SuperFGD, is proposed aiming to reduce the...
We created an extremely successful planetarium show called: Phantom of the Universe - The Hunt for Dark Matter, which has been seen in more than 600 planetariums in 67 countries and 42 US states. It has been translated into 22 languages. We were motivated in part by envisioning several scenes that could only work in a planetarium. Our target audiences were the public and students. We found...
This talk introduces and shows the simulated performance of an FPGA-based technique to improve fast track finding in the ATLAS trigger. A fast track trigger is being developed in ATLAS for the High Luminosity upgrade of the Large Hadron Collider (HL-LHC), the goal of which is to provide the high-level trigger with full-scan tracking at 100 kHz in the high pile-up conditions of the HL-LHC....
The search for long-lived particles (LLP) at the LHC can be improved with timing information. If the visible decay products of the LLP form jets, the arrival time is not well-defined. In this talk, I will discuss possible definitions and how they are affected by the kinematics of the underlying parton-level event.
In a seesaw scenario, GUT and family symmetry can severely constrain the structure of the Dirac and Majorana mass matrices of neutrinos. We will discuss an interesting case where these matrices are related in such a way that definite predictions for light neutrino masses are achieved without specifying the seesaw scale. This opens up the possibility to consider both high- and low-scale...
A simultaneous measurement of the three components of the top-quark and top-antiquark polarization vectors in $t$-channel single-top-quark production is presented. Due to the large mass of the top quark, the $t\rightarrow Wb$ decay occurs before hadronization, giving one access to its polarization through the angular distribution of the decay products. The analysis we present uses an...
Cosmological observations indicate that our universe contains dark matter (DM), yet we have no measurements of its microscopic properties. Whereas the gravitational interaction of DM is well understood, its interaction with the Standard Model is not. Direct detection experiments, the current standard, search for nuclear recoil interactions and have low-mass sensitivities down to ~1 GeV. A path...
Four top-quark production, a rare process in the Standard Model (SM) with a cross-section around 12 fb, is one of the heaviest final states produced at the LHC, and it is naturally sensitive to physics beyond the Standard Model (BSM). A data excess is observed with twice of the expectation. A follow-up analysis is the search for Heavy (pseudo)Higgs boson A/H produced in association with a...
This talk presents a search for a new resonance $W^\prime$ decaying into a $W$ boson and a $125~\text{GeV}$ Higgs boson $H$ in the ${\ell^{\pm}{\nu}b\bar{b}}$ final states, where $\ell = e,~\mu,~\mathrm{or}~\tau$, using $pp$ collision data at 13 TeV corresponding to an integrated luminosity of 139 fb$^{-1}$ collected by the ATLAS detector at LHC. The search considers the one-lepton channel,...
Line-intensity mapping (LIM) of millimeter-wavelength tracers is a promising new technique for mapping cosmic structure at redshifts beyond the reach of galaxy surveys. I will describe the design and science motivation for the South Pole Telescope Summertime Line Intensity Mapper (SPT-SLIM), which seeks to demonstrate the use of on-chip spectrometers based on microwave kinetic inductance...
Detection and understanding of dark matter is one of the major unsolved problems of modern particle physics and cosmology. Several theories of fundamental physics predict bosonic dark matter candidates that can modify Maxwell’s equations resulting in additional photon emission from conducting surfaces. One of these promising dark matter candidates is known as the axion, which could be detected...
The high collision energy and luminosity of the LHC allow studying jets and hadronically-decaying tau leptons at extreme energies with the ATLAS detector. These signatures lead to topologies with charged particles, which are reconstructed as tracks with the ATLAS inner detector, at an angular separation smaller than the size of a charge cluster in the ATLAS pixel detector, forming merged pixel...
The QCD axion represents a well-motivated new physics candidate capable of explaining dark matter and the absence of the neutron electric dipole moment. If realized after the breaking of a Peccei-Quinn symmetry after the end of inflation, the late-time number density of axions is jointly determined by radiation of axions from topological defects known as strings and from the dynamics of the...
An Effective Field Theory (EFT) re-interpretation of the differential measurement of Vector Boson Fusion Higgs production and decay to two W bosons will be reported. The analysis used the full Run-2 data in 2015--2018 of $pp$ collisions at $\sqrt{s}$=13 TeV with the ATLAS detector at the LHC, which correspond to an integrated luminosity of 139 fb$^{−1}$. Events with an electron and a muon from...
Weakly coupled light new physics is a well motivated lamppost often referred to as a dark sector. At low masses and weak couplings, dark sector particles are generically long-lived. In this talk I will describe how neutrino-portals to a dark sector can be efficiently probed by looking for the decay of heavy neutral leptons that are produced via the upscattering of solar neutrinos within the...
A novel particle detector design is proposed utilizing a modified bandgap reference circuit. The output of the circuit is calibrated to be proportional to the work function of gallium nitride, which provides a reference voltage that is independent of temperature variations, supply variations and loading. It is hypothesized that particle interactions with the detector cause temporal...
Simulating Particle Detection (SPD) stream is a research program within UMD's FIRE, a gen-ed sequential course-based undergraduate research experience program. SPD introduces undergraduate students to experimental high energy particle physics. It concentrates on computing, data analysis and visualization, specifically using simulations of the upgrade calorimeters (HGCAL) of the CMS experiment...
In the inflationary paradigm, a background of primordial gravitational waves is predicted to be produced. These perturbations would leave a unique signature in the curl component of the cosmic microwave background (CMB) polarization (B-modes). A detection of B-modes spectrum power at degree angular scale would constrain the intensity of the tensor perturbations generated during inflation ....
A search for a new heavy boson $W^{\prime}$ in proton-proton collisions at $\sqrt{s}$ = 13 TeV is presented. The search focuses on the decay of the $W^{\prime}$ to a top quark and a bottom quark, using the full Run 2 dataset collected with the ATLAS detector at the LHC with an integrated luminosity of 139 $\text{fb}^{−1}$. The talk will give an overview of the analysis, which includes the...
Many extensions of the Standard Model include the addition of charged Higgs bosons. The two-Higgs doublet model (2HDM) is one such extension that predicts the presence of charged Higgs bosons. The 2HDM predicts three neutral Higgs bosons along with a positive and negative charged pair of Higgs bosons. In this talk, we present a search for these charged Higgs bosons decaying into a top and...
The existence of dark matter is ubiquitous in cosmological data, yet numerous particle detectors have been thoroughly looking for it without any success. For strongly interacting dark matter, the bounds from these experiments are actually irrelevant; as dark matter enters the atmosphere, it scatters and slows down, such that it has a much lower velocity than the detector threshold when it...
Searches for physics beyond the Standard Model (SM) at collider experiments—mostly focused on prompt signatures with high momentum and high missing transverse energy—have thus far produced no definitive evidence for such phenomena. But what if they have been looking in the wrong places? Just as long-lived particles exist in the SM, beyond the SM physics may too feature such particles. Here, a...
The existence of dark matter is widely accepted, with a well motivated theo-retical candidate being a class of particles known as WIMPs (weakly interacting massive particles), which appear in the spectra of many extensions to the stan-dard model.
We explore a particular WIMP-like model in which fermionic dark matter weakly couples to the muon/tau sectors of the standard model through a new...
The ATLAS missing transverse momentum trigger is susceptible to the impact of multiple proton-proton interactions (pileup) in the same event. To mitigate the impact of pileup, sophisticated subtraction schemes are utilized. During the Run 2 data-taking (2015-2018), these methods focused only on information from the calorimeter due to the limited time available for the algorithms to utilize...
We report on the development of a track finding algorithm for the Fermilab Muon g-2 Experiment’s straw tracker using advanced Deep Learning techniques. Taking inspiration from original studies by the HEP.TrkX project, our algorithm relies on a Recurrent Neural Network with bi-directional LSTM layers to build and evaluate track candidates. The model achieves good performance on a 2D...
A search is presented for a light pseudoscalar Higgs boson (a) using data collected by the CMS experiment at LHC, at the center-of-mass of energy of 13 TeV. The study looks into the decay Higgs boson (H) via the H→aa→μμττ channel. The Higgs boson can be both standard-model-like (125 GeV) or heavier. The pseudoscalar mass falls within the range ma ϵ[2mτ,mH/2]. The large mass difference between...
A search for electroweak production of charginos and neutralinos at the Large Hadron Collider was conducted in 139 fb$^{-1}$ of proton-proton collision data collected at a center of mass energy of $\sqrt{s} = 13$ TeV with the ATLAS detector. This search utilizes fully hadronic final states with missing transverse momentum to identify signal events with a pair of charginos or neutralinos that...
Rare decays of the Higgs boson are promising laboratories to search for physics beyond the standard model (BSM). Such BSM physics might alter Yukawa couplings to lighter quarks and add loop diagrams, possibly resulting in higher decay rates than predicted by the standard model. For the first time in four-lepton final states, decays of the Higgs boson into a $ZJ/\psi$ or $Z\psi(2S)$ final...
Since 1984 the Italian groups of the Istituto Nazionale di Fisica Nucleare (INFN) and Italian Universities, collaborating with the DOE laboratory of Fermilab (US) have been running a two-month summer training program for Italian university students. While in the first year the program involved only four physics students of the University of Pisa, in the following years it was extended to...
Observations of dark matter structure at the smallest scales can tell us about physical processes taking place in the dark sector at very early times. Here, we point out that the presence of light degrees of freedom coupling to dark matter in the early Universe introduces a localized feature in the halo mass function. This leads to a mass function that is distinct in shape than either warm...
Studies of CP violation and anomalous couplings of the Higgs boson to vector bosons and fermions are presented. The data were acquired by the CMS experiment at the LHC and correspond to an integrated luminosity of 137 fb−1 at a proton-proton collision energy of 13 TeV. The kinematic effects in the Higgs boson's four-lepton decay H → 4ℓ and its production in association with two jets, a vector...
The Mu2e experiment at Fermilab will search for the charged-lepton flavor-violating process of a neutrinoless muon-to-electron conversion in the presence of a nucleus. The sensitivity goal of the experiment is four orders of magnitude below the current strongest limits on this process. This requires all backgrounds to sum to fewer than one event over the lifetime of the experiment. One major...
The Large Hadron Collider at CERN is upgrading to a High Luminosity version that will increase the instantaneous luminosity to 5x10^(34) cm^(-2)s^(-1). This substantial increase in rate means that the current experiments will need to be modified in order to cope with the increased rates. The Compact Muon Solenoid (CMS) detector is installing a new muon station consisting of 144 Gas Electron...
PROSPECT is a reactor antineutrino experiment designed to search for short-baseline sterile neutrino oscillations and to perform a precise measurement of the U-235 reactor antineutrino spectrum. The PROSPECT detector collected data at the High Flux Isotope Reactor (HFIR) at the Oak Ridge National Laboratory, with the ~4-ton volume covering a baseline range of 7-9m. To operate in this...
The Mu2e experiment, currently under construction at Fermilab, will search for charged lepton flavor violation (CLFV) in the form of coherent neutrinoless conversion of muons to electrons in the presence of an atomic nucleus. In order to reach its projected single-event sensitivity of $3 \times 10 ^{−17}$, Mu2e will need to create the most intense muon beam ever developed, with $10^{10}$...
We present a minimal UV complete framework to embed inflation and dark matter by extending the standard model with a singlet real scalar field (the inflaton) and a singlet fermonic field acting as dark matter. The inflaton features the most general renormalizable polynomial up to quartic order, which is flat due to the existence of a perturbed inflection-point, comfortably fitting CMB...
One of the key sub-detectors of the CMS experiment, located at the CERN Large Hadron collider, is the electromagnetic calorimeter (ECAL). This homogeneous calorimeter is designed to detect electrons and photons with energies from as low as 500 MeV up to 1 TeV. The ECAL is a homogeneous calorimeter consisting of ~76,000 scintillating crystals arranged around the collision point in an 8m long...
We present a search for a low mass dark photon below 1 MeV which is radiated from a muon in proton-proton collisions at a center-of-mass energy of 13 TeV. A low mass dark photon has no available decay channel to standard model particles, and is hence stable. We assume that a dark photon directly interacts with detector materials through bremsstrahlung, and its small kinetic mixing, in which...
Do neutrinos have sizable self-interactions? This fundamental question, whose answer directly affects future precise astrophysical and cosmological observations, is notoriously difficult to answer with laboratory experiments. For the last years, neutrino telescopes have been identified as unique tools to explore neutrino self-interactions. The actual discovery of astrophysical neutrinos and...
The Standard Model of particle physics is in remarkable agreement with most experimental data so far. However, a lot of questions remain unanswered, such as the origin of neutrino masses or the need for extra sources of CP violation. Possible solutions rest on scalar sector extensions, popular beyond-the-Standard-Model scenarios, in which the addition of scalar triplets is an attractive...
Axion couplings to photons could induce photon-axion conversion in the presence of magnetic fields in the Universe. This conversion could impact various cosmic distance measurements, such as luminosity distances to type Ia supernovae and angular distances to galaxy clusters, in different ways. In this paper we consider different combinations of the most up-to-date distance measurements to...
The ICARUS detector will search for LSND like neutrino oscillations exposed at shallow depth to the FNAL BNB beam in the context of the SBN program. In the approved FNAL SBN experiment the impact of cosmic rays is mitigated by a $4\pi$ Cosmic Ray Tagger (CRT) detector encapsulating the TPCs inside the pit and by a ~3 m concrete overburden both for the near and the far detectors. Cosmic...
Dwarf galaxies are relatively pristine objects for testing dark matter microphysics due to weak baryonic feedback in them. We use a particular class of dwarfs which are gas-rich to probe DM interactions with ordinary matter. We require the rate of heat exchange between DM and gas to not exceed the low radiative cooling rate of the gas. This gives strong constraints on popular DM models: our...
A modest extension of the Standard Model by two additional Higgs doublets - the Higgs Troika Model - can provide a well-motivated scenario for successful baryogenesis if neutrinos are Dirac fermions. Adapting the ``Spontaneous Flavor Violation'' framework, we consider a version of the Troika model where light quarks have significant couplings to the new multi-TeV Higgs states. Resonant...
Calibrating the pion energy response is a core component of reconstruction in the ATLAS calorimeter. Deep learning techniques have shown the best energy resolution for a wide range of particle momenta [1]; to further improve the pion energy resolution, a Mixture Density Network (MDN) based deep learning algorithm is explored. In addition to estimating the energy, the MDN also estimates the...
The cosmic-ray-veto detector (CRV) for the Mu2e experiment consists of four layers of plastic scintillating counters read out by silicon photo-multipliers (SiPM) through wavelength-shifting fibers. This presentation reports the testing procedure and light properties of wavelength-shifting fibers with a diameter of 1.8 mm that were purchased to improve the CRV efficiency in certain critical...
The Mu2e experiment being constructed at Fermilab will search for indications of Charged Lepton Flavor Violation by measuring 105-MeV electrons emitted in conversions of negative muons into electrons in the nuclear field without emission of neutrinos. Mu2e-II is a proposed upgrade to the baseline Mu2e experiment to extend the reach by an order of magnitude. To enhance charged-pion...
The Precision Reactor Oscillation and Spectrum Experiment (PROSPECT) is an above-ground antineutrino experiment at short baselines located at the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL). The PROSPECT detector comprises 4-tons of Li-6 doped liquid scintillator (6LiLS) divided into an 11x14 array of optically separated segments. This experiment's physics goals...
The quest for lepton-flavor-violating processes at the LHC represents one of the key searches for new physics beyond the Standard Model (SM). We present a search for Higgs boson decays into a tau lepton and either an electron or a muon. The analysis uses data from proton-proton collisions at the LHC at $\sqrt{s}= 13$ TeV, collected by the ATLAS detector and corresponding to an integrated...
The CMS muon system plays an important role in the discovery of new physics like the Higgs boson and new particles. The next phase of the LHC is planned to increase luminosity to improve the discovery power. The high luminosity LHC (HL-LHC) will be a harsh environment of pp collisions and will require high-performance muon trigger and muon track reconstruction, especially in the endcap region....
Originally, the Large Hadron Collider (LHC) was designed to complete the Standard Model (SM) of particle physics, and while great progress has been made in validating the SM, it still leaves unexplained phenomena. Because of this, it is useful to implement the search for Beyond the Standard Model (BSM) physics. The high luminosity upgrade to the LHC (HL-LHC) can improve current searches for...
Quantum machine learning could possibly become a valuable alternative to classical machine learning for applications in High Energy Physics by offering computational speed-ups. In this study, we employ a support vector machine with a quantum kernel estimator (QSVM-Kernel method) to a recent LHC flagship physics analysis: $\mathrm{t\overline{t}}$H (Higgs boson production in association with a...
Indirect detection experiments typically measure the flux of annihilating dark matter (DM) particles propagating freely through galactic halos. We consider a new scenario where celestial bodies "focus" DM annihilation events, increasing the efficiency of halo annihilation. In this setup, DM is first captured by celestial bodies, such as neutron stars or brown dwarfs, and then annihilates...
The Daya Bay and PROSPECT experiments have made world-leading measurements of the $^{235}$U antineutrino fission spectra using liquid scintillator detectors located at nuclear reactors. The Daya Bay experiment has deconvolved a $^{235}$U spectrum from $\sim$3.5 million detected antineutrinos generated from power reactors with an isotopic mixture of fuels, and PROSPECT has detected $\sim$50,000...
As an unsupervised machine learning strategy, optimal transport (OT) has been applied to jet physics for the computation of distance between collider events. Here we generalize the Energy Mover’s Distance to include both the balanced Wasserstein-2 (W2) distance and the unbalanced Hellinger-Kantorovich (HK) distance. Whereas the W2 distance only allows for mass to be transported, the HK...
We explore the new physics reach for the off-shell Higgs boson measurement in the $pp \rightarrow 𝐻^∗ \rightarrow 𝑍(ℓ^+ℓ^−)𝑍(𝜈\bar{𝜈})$ channel at the high-luminosity LHC. The new physics sensitivity is parametrized in terms of the Higgs boson width, effective field theory framework, and a non-local Higgs-top coupling form factor. Adopting Machine-learning techniques, we demonstrate that the...
The Heavy Photon Search experiment searches for electro-produced dark photons using an electron beam provided by CEBAF at the Thomas Jefferson National Accelerator Facility. HPS looks for dark photons through two distinct methods – a resonance search in the e+e invariant mass distribution above the large QED background for large dark photon-SM particles couplings, and a displaced vertex search...
Self-interaction among the neutrinos in the early Universe has been proposed as a solution to the Hubble tension, a discrepancy between the measured values of the Hubble constant from CMB and low-redshift data. However, flavor-universal neutrino self-interaction is highly constrained by BBN and several laboratory experiments such as, tau and K-meson decay, double-neutrino beta decay etc. In...
The Supernova Early Warning System (SNEWS) is a public alert system that provides a warning to astronomers about the observation of neutrinos from a Galactic supernova. These events are extremely rare, so it will be crucial to gather all the physics possible from the next event. SNEWS has been operating as a simple coincidence between neutrino experiments from all around the world for more...
At the high luminosity Large Hadron Collider (LHC), the instantaneous luminosity will be up to $5-7.5 \times 10^{34} cm^{-2} s^{-1}$. This necessitates the upgrade of the muon spectrometer of the ATLAS detector. The Small Wheel, the innermost station of muon end-cap system, will be replaced by the 'New Small Wheel (NSW)'. For the high luminosity runs, the new system is required to improve...
The PROSPECT and STEREO experiments recently reported modern measurements of the $^{235}$U antineutrino energy spectra from highly-enriched uranium (HEU) research reactors using liquid scintillator based detectors. At HEU reactors, 99% of the antineutrino flux comes from $^{235}$U, providing a direct measure of the energy spectrum and antineutrino flux from a single isotope. STEREO and...
We revisit the solution to the $(g-2)_\mu$ puzzle based on a kinetically mixed dark photon. Despite this scenario being excluded in minimal models with fully visible and fully invisible dark photon decays, we show that semi-visible scenarios are still allowed by explicitly re-evaluating constraints from B-factories and fixed-target experiments. Such a solution points to dark photons with...
The top-quark Yukawa coupling $y_t$ is the strongest interaction of the Higgs boson in the Standard Model (SM) with $y_t \sim 1$. Due to its magnitude, it plays a central role in Higgs phenomenology in the SM and would be most sensitive to physics beyond the Standard Model. The top Yukawa can be directly measured at the LHC via top pair production in association with a Higgs boson...
The Mu2e experiment aims to measure the neutrinoless, muon-to-electron conversion process in the field of a nucleus with a single event sensitivity of $2.8×10^{-17}$. The Mu2e tracker utilizes an array of straw tube panels in a solenoidal magnetic field to track the conversion electrons and measure their momenta. Using pre-production panels, tracker operation and diagnosis schemes were...
Clustering of charged particle tracks along the beam axis is the first step in reconstructing the positions of proton-proton (p-p) collisions at Large Hadron Collider (LHC) experiments. In this talk, we formulate this problem for a 2048 qubit D-Wave quantum computer that works by quantum annealing. We showcase the performance of the quantum annealer on artificial events generated from p-p...
A search for a light pseudoscalar (a) in the composite Higgs model is performed in the gluon-gluon fusion production channel with decay to di-tau. The lightness of a makes it such that the most promising topology is that of a boosted di-tau topology, where a is created with significant momentum transverse to the LHC beam line before decaying into a pair of taus. Preliminary...
Macroscopic dark matter is almost unconstrained over a wide ``asteroid-like'' mass range, where it could scatter on baryonic matter with geometric cross section. We show that when such an object travels through a star, it produces shock waves which reach the stellar surface, leading to a distinctive transient optical, UV and X-ray emission. This signature can be searched for on a variety of...
The next generation of neutrino telescopes, including Baikal-GVD, KM3NeT, P-ONE, TAMBO, and IceCube-Gen2, will be able to determine the flavor of high-energy astrophysical neutrinos with 10% uncertainties. With the aid of future neutrino oscillation experiments --- in particular JUNO, DUNE, and Hyper-Kamiokande --- the regions of flavor composition at Earth that are allowed by neutrino...
Deep learning techniques have gained tremendous attention from researchers in many fields, including particle physics. However such techniques typically do not capture model uncertainty. Bayesian models offer a solid framework to quantify the uncertainty, but they normally come with a high computational cost. A recent paper develops a new theoretical framework casting dropout in Neural...
Axion-like particles (ALPs) provide a promising direction in the search for new physics, while a wide range of models incorporate ALPs. We point out that neutrino and dark matter experiments, such as DUNE, CCM, possess competitive sensitivity to ALP signals. High-intensity proton beams can not only produce copious amounts of neutrinos, but also cascade photons that are created from charged...
In this talk, we explore the collider phenomenology of the charged Higgs boson in the context of a Beyond Standard Model scenario with extended gauge and scalar sector. Because of the intricate pattern of symmetry breaking, the charged Higgs can simultaneously decay via heavy gauge boson mediated channels ($W^{'}Z/ WZ^{'}$) along with the traditional SM decay modes. Our goal here is to...
A framework is presented to extract and understand decision-making information from a deep neural network classifier of jet substructure tagging techniques. The general method studied is to provide expert variables that augment inputs (“eXpert AUGmented” variables, or XAUG variables), then apply layerwise relevance propagation (LRP) to networks that have been provided XAUG variables and those...
The capture of Dark Matter in Neutron Stars has garnered considerable interest in recent years. This interest is driven by the prospect that the energy deposited by dark matter scattering can heat these objects to infra-red temperatures, which may soon be within reach of observations. In order to obtain reliable results from these searches, proper incorporation of the physics of Neutron stars...
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 include the $t\bar{t}$ spin-correlations, with mass minimization strategies to reconstruct the $t\bar{t}$ rest frame...
The Precision Reactor Oscillation and Spectrum Experiment, PROSPECT, at the High Flux Isotope Reactor at ORNL has made word-leading measurements of reactor antineutrinos at short baselines. PROSPECT provides some of the best limits on eV-scale sterile neutrinos, has made a precision measurement of the reactor antineutrino spectrum of $^{235}$U from a highly-enriched uranium reactor, and has...
Many particle physics experiments utilise a pull term method to perform fits to data, in which systematic uncertainties are treated as nuisance parameters that reweight the predicted spectrum. However, this approach scales poorly in fit complexity as the number of systematic uncertainties increases. Conversely, one can utilise a Gaussian multivariate technique, in which systematic...
The Mu2e experiment will search for Beyond-the-Standard-Model, Charged Lepton Flavor Violation (CLFV) in the neutrinoless muon-to-electron conversion process $\mu^- + \text{Al}\rightarrow e^- + \text{Al}$. The number of muons stopped and captured by the aluminum Stopping Target is measured by the Stopping Target Monitor (STM) using muon atomic capture x-rays and muon nuclear capture...
ATLAS is preparing for the HL-LHC upgrade, where integrated and instantaneous
luminosity will reach unprecedented values. For this, an all-silicon Inner
Tracker (ITk) is under development with a pixel detector surrounded by a strip
detector. The strip system consists of 4 barrel layers and 6 endcap disks.
Prototyping has been completed successfully, and pre-production is about to...
I will discuss the implications of self-interacting dark-sectors with light degrees of freedom and mass thresholds on early universe physics. Such models exhibit a relative increase in the energy density of the dark sector when the temperature crosses a mass threshold. Of special interest are models with mass thresholds below $\mathcal{O}({\rm MeV})$. In this region of parameter space, the...
I discuss the scenario where the SM scalar sector is enhanced by two real scalar singlets. This model features 3 CP even neutral states that mix and allow for interesting decay chains, e.g. an asymmetric h3-> h1 h2 process with non-degenerate masses or h2-> h1 h1 processes with non SM-like masses. I will present several benchmark planes within this model which lead to interesting novel...
I will describe how to use the 21-cm line of hydrogen to learn about the nature of dark matter in the early universe. I will begin with an overview of the 21-cm signal during cosmic dawn and reionization, and give a brief update of the 2021 status of both theory and measurements. Then, I will show how to use the depth of the signal as a thermometer to learn about anomalous cooling or heating...
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...
In this talk, I will propose the use of the Earth as a transducer for ultralight dark-matter detection. In particular I will point out a novel signal of kinetically mixed dark-photon dark matter: a monochromatic oscillating magnetic field generated at the surface of the Earth. Similar to the signal in a laboratory experiment in a shielded box (or cavity), this signal arises because the lower...
As the LHC prepares to enter its third run, analyses are increasingly focused on a drive for precision physics. One of the great tools for precision physics in this field is that of unfolding. This talk describes the development and usage of RooUnfold, RooFitUnfold, and RooUnfoldML in particle physics. Together they form a complete series of statistical software packages for the treatment...
n this talk I will highlight recent results from the CMS and ATLAS Collaborations. Additionally, an overview will be given of the status of the two detectors during the LHC shutdown and the preparations for the upcoming data-taking period.
In recent years, Machine Learning (ML) and Artificial Intelligence (AI) methods have become ubiquitous in High Energy Physics research. Though initial implementations of ML for HEP focused mainly on supervised learning for classification problems like jet tagging or event selection, HEP researchers are increasingly employing cutting edge techniques for a wide range of applications and even...
LHC provides one of the most potent and comprehensive physics tests in the TeV realm and is on its course to realize its full potential with upgrades. Beyond the vast class of successful searches, many new and exciting opportunities are emerging. In this talk, I will highlight several new angles and directions at the LHC, such as precision physics and exotic signatures, to motivate us for the...
The holographic principle tells us that quantum theories of gravity behave like lower dimensional theories without gravity. We will review lessons learned from applying this principle in the context of gauge/gravity duality and black hole thermodynamics, show how it has guided recent efforts to recast scattering amplitudes in terms of a conformal field theory living on the celestial sphere,...
We study the simplest viable dark matter model with an additional neutral real singlet scalar, including a vectorlike singlet and doublet fermions. We find a considerable enhancement in the allowed region of the scalar dark matter parameter spaces in the presence of these fermions. This model could also accommodate tiny neutrino masses and mixing at one loop-level through the radiative seesaw...
We consider an explicit effective field theory example based on the Bousso-Polchinski framework with a large number N of hidden sectors contributing to supersymmetry breaking. Each contribution comes from four form quantized fluxes, multiplied by random couplings. The soft terms in the observable sector in this case become random variables, with mean values and standard deviations which are...
The Mu2e Experiment at Fermilab is looking for neutrino-less conversion of a muon to an electron. The experiment requires an extremely efficient Cosmic Ray Veto (CRV) to detect cosmic muons and ignore them so they cannot be confused with a successful direct conversion. Similarly, noise generated by neutrons and gamma rays from muon beam production/transportation can challenge the operation of...
The cross sections of the Z boson production in association with at least two b jets as a function of various kinematic variables are measured in pp collisions at $\sqrt{s} = 13$ TeV using 137 fb$^{−1}$ of data collected by the CMS experiment at LHC. The Z boson decays to electrons or muons are considered with leading (sub-leading) lepton transverse momentum $p_{T} >$ 35 (25) GeV and...
Triple gauge boson production is an important class of processes at the LHC. It allows measurements to test the quartic gauge couplings in the Standard Model and constrain the non-standard gauge couplings in the Standard Model effective field theory (SMEFT). We perform the computations of the NLO EW and QCD corrections to $W^{+}Z\gamma$ production with leptonic decays in SM at the LHC. The...
The MIP Timing Detector (MTD) is a new sub-detector planned for the Compact Muon Solenoid (CMS) experiment at CERN, aimed at maintaining the excellent particle identification and reconstruction efficiency of the CMS detector during the High Luminosity LHC (HL-LHC) era. The MTD will provide new and unique capabilities to CMS by measuring the time-of-arrival of minimum ionizing particles with a...
Gravitational-wave (GW) detections are rapidly increasing in number, enabling precise statistical analyses of the population of compact binaries. In this talk I will show how these population analyses cannot only serve to constrain the astrophysical formation channels, but also to learn about cosmology. The three key observables are the number of events as a function of luminosity distance,...
The DUNE physics program primarily focuses on signals in the GeV energy range. In recent years, DUNE's potential as a low-energy experiment has been fruitfully explored, specifically regarding its sensitivity to signals as low as 5-10 MeV such as those associated with supernova burst and solar neutrinos. In this presentation I discuss the requirements and modifications that could extend DUNE's...
T2K (Tokai to Kamioka) is a Japan based long-baseline neutrino oscillation experiment designed to measure (anti-)neutrino flavor oscillations. A neutrino beam peaked around 0.6 GeV is produced in Tokai and directed toward the water Cherenkov detector Super-Kamiokande, which is located 295 km away. A complex of near detectors is located at 280 m and is used to constrain the flux and...
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 also has a rich phenomenology at different energy scales. We explore the underlying connections between...
The Deep Underground Neutrino Experiment (DUNE) is an international project for precision neutrino physics. DUNE will consist of two detector complexes exposed to the world’s most intense neutrino beam. The Near Detector complex will sample the beam near the neutrino production target, at Fermilab. The Far Detector, comprised of four LArTPC modules each with 17-kton LAr mass, will be located...
The Compact Muon Solenoid (CMS) detector at the CERN Large Hadron Collider (LHC) is undergoing an extensive Phase II upgrade program to prepare for the challenging conditions of the High-Luminosity LHC (HL-LHC). A new timing detector in CMS will measure minimum ionizing particles (MIPs) with a time resolution of ~30-40 ps and hermetic coverage up to a pseudo-rapidity of |η|=3. The Endcap...
Precision measurements and searches for new phenomena in the Higgs sector are among the most important goals in particle physics. Experiments at the Future Circular Colliders (FCC) are ideal to study these questions. Electron-positron collisions (FCC-ee) up to an energy of 365 GeV provide the ultimate precision with studies of Higgs boson couplings, mass, total width, and CP parameters, as...
In the Standard Model, we cannot obtain the mechanism how to derive the left-handed neutrino masses. Our strategy to solve it is to exploit the Seesaw Mechanism. To get the right-handed Majorana neutrino masses for the Seesaw Mechanism, we utilized and studied the D-brane instanton effect with magnetized orbifold models on torus. Many models can be constructed by changing the magnetic fluxes....
A search is presented for new particles in proton-proton collisions at $\sqrt{s}$ = 13 TeV at the LHC, using events with energetic jets and large missing transverse momentum. The analysis is based on a data sample corresponding to an integrated luminosity of 101 $\mathrm{fb}^{-1}$, collected in 2017–2018 with the CMS detector. Separate categories are defined for events with narrow jets from...
Cosmic string network generically appears in many natural extensions of particle SM. And cosmic strings are one-dimension topological defects which can be formed in grand unified theory scale phase transitions in the early universe and are also predicted to form in the context of string theory. The main mechanism for a network of Nambu-Goto cosmic strings to lose energy is through the...
The Mu2e experiment is designed to search for New Physics in an extremely rare process of muon to electron neutrino-less conversion. The Mu2e sensitivity to New Physics heavily relies on suppressing all the background sources to a fraction on event. The dominant background at Mu2e originates from cosmic ray (CR) muons that interact or decay in the detector solenoid and produce a signal-like...
Although being very successful, the Standard Models (SM) of particle physics, fails to explain some observations and also puzzles. In particular, neutrino data can’t be accommodated within the SM. Also, the origin of observed hierarchies between charged fermion masses and CKM matrix elements remain unexplained within the SM.
We consider simple extension by non-anomalous U(1) flavor...
The R-parity violating decays of Wino charginos, Wino neutralinos and Bino Neutralinos LSPs are
analyzed within the context of the B − L MSSM “heterotic standard model”. These LSPs correspond
to statistically determined initial soft supersymmetry breaking parameters which, when evolved using
the renormalization group equations, lead to an effective theory satisfying all phenomenological...
Measurements of the production rate of Z bosons in association with heavy quarks provide sensitive tests of perturbative quantum chromodynamics (pQCD) predictions, which are made at next-to-leading-order (NLO) accuracy using either a 4-flavor number scheme (4FNS) or 5-flavor number scheme (5FNS). In the 4FNS, b-quarks are not present in the parton distribution functions (PDFs) and only appear...
We study a model which generates Majorana neutrino masses at tree-level via low-energy effective operator with mass-dimension-9. The introduction of such a higher dimensional operator brings down the lepton number violating mass scale to TeV making such model potentially testable at present or near future colliders. This model possesses several new $SU(2)_L$ fermionic multiplets, in...
The Mu2e experiment at Fermilab seeks to observe the ultra-rare conversion of a muon to an electron in a nuclear field, which produces a monoenergetic electron with an energy close to the muon rest mass. This process violates charged lepton flavor number conservation in the Standard Model, and is a clear signal for New Physics if observed. Mu2e’s most dangerous source of background is...
The strongly coupled heterotic M-theory vacuum for both the observable and
hidden sectors of the B − L MSSM theory is reviewed, including a discussion of
the “bundle” constraints that both the observable sector SU(4) vector bundle
and the hidden sector bundle induced from a single line bundle must satisfy.
Gaugino condensation is then introduced within this context, and the hidden
sector...
Parity solutions to the strong CP problem are a compelling alternative to approaches based on Peccei-Quinn symmetry, particularly given the expected violation of global symmetries in a theory of quantum gravity. The most natural of these solutions break parity at a low scale, giving rise to a host of experimentally accessible signals. In this talk, we give an overview of this class of...
At the EIC, semi-inclusive production of hadrons and jets in deep-inelastic scattering (DIS) are crucial processes to obtaining information about the polarized TMD PDFs of the proton. Notably, recently it was proposed that in DIS the coupling of the proton PDFs and the T-odd part of the TMD jet function in semi-inclusive jet production can provide important information on the proton PDFs, such...
We report on new results and simulations from the Askaryan Calorimeter Experiment (ACE) which uses the coherent microwave Cherenkov emission from high energy particle showers in dielectric-loaded waveguides as calorimetric timing layers with ~1 ps resolution. Above ACE's energy threshold, a single 5 cm thick (1.4 $X_0$) layer of ACE waveguides would provide ~1 ps timing resolution, 3D spatial...
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...
After the triumph of discovering the Higgs boson at the CERN Large Hadron Collider, people are getting increasingly interested in studying the Higgs properties in detail and searching for the physics beyond the Standard Model (SM). A multi-TeV lepton collider provides a clean experimental environment for both the Higgs precision measurements and the discovery of new particles. In high-energy...
The visible content of the Universe is made up of baryons and almost without of anti-baryons, so it requires a baryogenesis mechanism to generate the baryon asymmetry and it is widely believed that successful baryogenesis requires extending the Standard Model. There are strong evidence of invisible contents, Dark Matter (DM) in the universe in astrophysical observations, such as rotational...
T2K (Tokai to Kamioka) is a long-baseline neutrino oscillation experiment situated in Japan with a baseline of 295 km and a neutrino beam of energy peaked at 600 MeV. The experiment can record data using either a mainly neutrino or mainly anti-neutrino beam, allowing to study the difference between the oscillations of neutrinos and anti-neutrinos. In T2K, one powerful method to test the...
Pair production of dark photons is predicted from models of supersymmetry. When both dark photons decay into muon pairs, a trigger selection with three muons can be highly efficient for GeV-scale dark photons. We report the results of a simulation study of the CMS detector for p-p collisions at 14 GeV with average pile-up (interactions per bunch crossing) of 200. In this study, the dark...
The Mu2e experiment will search for neutrinoless, coherent conversion of a muon into an electron in the presence of an aluminum nucleus. This conversion process is an example of charged lepton flavor violation (CLFV), which has never been observed experimentally. Mu2e is designed to accurately detect the 105 MeV/c conversion electron (CE) momentum in a uniform 1 T magnetic field. We...
We have analyzed new contributions to the muon anomalous magnetic moment in a class of models that generates a naturally large transition magnetic moment for the neutrino (needed to explain the XENON1T electron recoil excess). These models are based on an approximate $SU(2)_H$ symmetry that suppresses the neutrino mass while allowing for a large neutrino transition magnetic moment. We have...
Supermassive black hole binary mergers generate a stochastic gravitational wave background detectable by pulsar timing arrays. While the amplitude of this background is subject to significant uncertainties, the frequency dependence is a robust prediction of general relativity. We show that the effects of new forces beyond the Standard Model can modify this prediction and introduce unique...
FASER (ForwArd Search ExpeRiment) fills the axial blindspot of other, radially arranged LHC experiments. It is installed 480 meters from the ATLAS interaction point, along the collision axis. FASER will search for dark matter and other new, long-lived particles that may be hidden in the collimated reaction products exiting ATLAS. FASER comprises: a magnetic spectrometer built with ATLAS...
Since the first positive measurement of the Λ-hyperon global spin polarization in heavy-ion collisions by STAR in 2017, the understanding of the nature of this phenomenon is one of the most intriguing challenges for the community. As relativistic fluid dynamics celebrates multiple successes in describing collective dynamics of the QCD matter in such reactions, the natural question arises...
Neutrinos offer a variety of insights into Standard Model physics that are not yet understood, including flavor oscillations and the neutrino mass ordering. One instrument being used to study neutrinos is the IceCube South Pole Neutrino Observatory, a cubic kilometer-scale Cherenkov detector over 1.5 km below the South Pole. An extension, the IceCube-Upgrade, is currently under development and...
The recently proposed MUonE experiment at CERN aims at providing a novel determination of the leading order hadronic contribution to the muon anomalous magnetic moment through the study of elastic muon-electron scattering at relatively small momentum transfer. The anticipated accuracy of the order of 10ppm requires high-precision predictions, including all the relevant radiative corrections....
We revisit a discussion of one possible way to search for lepton flavor violation (LFV), muonium-antimuonium oscillations. This process violates muon lepton number by two units and could be sensitive to the types of beyond the standard model physics that are not probed by other types of LFV processes. Using techniques of effective field theory, we calculate the mass and width differences of...
The general U$(1)_𝑋$ extension of the Standard Model (SM) is a well motivated scenario which has a plenty of new physics options. Such a model is anomaly free which requires to add three generations of the SM singlet right-handed neutrinos (RHNs) which naturally generates the light neutrino masses by the seesaw mechanism.This offers interesting phenomenological aspects in the model. In...
The T2K long-baseline neutrino oscillation experiment has measured a first indication of leptonic CP violation. Reducing the systematic uncertainty on predicted events at the far site is an urgent priority for the collaboration. In 2022, the T2K near detector will be upgraded to reduce systematic uncertainties to enable higher precision measurements of neutrino oscillation phenomena. The...
The use of precision timing to measure time-of-flight or to distinguish events from the same bunch crossing in collider detectors has become a common feature of many modern experiments. Currently achieving a precision of 30 picoseconds is seen as an attainable goal. To move to a precision close to one picosecond will require further advances in our time measurement technology. One central...
We study electroweak phase transition and resultant GWs of a CP conserving 2HDM with a softly broken $Z_2$ symmetry. We analysed the parameter space of both type I and type II 2hdm without relying on any decoupling limit. We observe $M_{H^\pm} \approx M_H$ or $M_{H^\pm} \approx M_A$ favours SFOEWPT in 2HDM. In addition to di-Higgs production, scalar to fermion decay channel is also important...
In certain extensions of the Standard Model(SM), the interactions between the new scalars and the SM Higgs can cause the electroweak(EW) symmetry to remain broken at temperatures well above the electroweak scale. Fermionic-induced EW symmetry non-restoration (EWSNR) effect has also been studied in the context of effective field theories, where EWSNR is linked to some non-renormalizable...
This talk presents a model of the electron-like excess observed by the MiniBooNE experiment comprised of oscillations involving a new mass state, $\nu_4$, at $\mathcal{O}(1)$ eV and a high mass state, $\mathcal{N}$, at $\mathcal{O}(100)$ MeV that decays to $\nu+\gamma$ via a dipole interaction.
Short baseline oscillation data sets (omitting MiniBooNE appearance data) are used to predict the...
The Mu2e experiment at Fermilab will search for charged lepton flavor violation (CLFV) via muon to electron conversion, with a goal of improving the previous upper limit by four orders of magnitude and reaching unprecedented single-event sensitivities. The signal of CLFV conversion is a ~105 MeV electron, which is detected using a high-precision straw tracker. Protons produced by muon capture...
Lepton-flavor violating transitions provide excellent tools to probe physics beyond the Standard Model (BSM). Processes such as radiative muon decays or muon conversion on nuclei probe a variety of different operators. We point out that Rayleigh operators that contribute to muon conversion can also be probed in a much simple environment of e+e- collisions. We report on the computation of short...
Long-baseline neutrino oscillation experiments such as T2K (Tokai-to-Kamioka) and DUNE ( Deep Underground Neutrino Experiment) rely on models of neutrino interaction on nuclei. A major systematic uncertainty in the model of neutrino interaction comes from the blindness of the detector to the neutrino-induced neutrons in the final state. The 3D-projection scintillator tracker, which consists of...
In recent years, deep learning has played an emerging role in event reconstruction for neutrino experiments using liquid argon TPCs (LArTPCs), a high-precision particle imaging technology. Several algorithms have been developed to infer the 3D location of charge depositions in the detector. Furthermore, the development of 2D pixel-readouts naturally provides 3D positions. Therefore, there is a...
We present a search for dark matter production in events with missing transverse momentum and a Higgs boson decaying to a photon pair using 139 fb$^{-1}$ of $pp$ collisions recorded by the ATLAS experiment at a center-of-mass energy of 13 TeV. The search considers three simplified dark matter models which include either vector or pseudo-scalar mediators and predict final states with a pair of...
Building upon the most recent CT18 global fit, we present a new calculation of the photon content of proton based on an application of the LUXqed formalism. In this work, we explore two principal variations of the LUXqed ansatz. In one approach in which we designate CT18lux, the photon PDF is calculated directly using the LUXqed formula for all scales, $Q$. In an alternative realization,...
One major puzzle in particle physics is the replicated lepton families. There appears to be a ‘family symmetry’ which prevents charged lepton flavor violating (CLFV) processes. If a continuous global lepton family symmetry exists, it leads to associated Goldstone bosons, ‘familons’, through spontaneous symmetry breaking. The familon can acquire mass if this symmetry is also explicitly...
We show that assuming flavour violation in the first two generations
of sfermions in the decoupling limit leads to interesting consequences for proton decay. Assuming the decoupling sfermions lie within 30 TeV, for the decay mode $p \to e^+ \pi^0$, which has sensitivity beyond that of DUNE and Hyper K is brought within the reach of those experiments. The most of the decay modes which is $p...
We show that one of the simplest extensions of the Standard Model, the addition of a second Higgs doublet, when combined with a dark sector singlet scalar, allows us to: i) explain the long-standing anomalies in the Liquid Scintillator Neutrino Detector (LSND) and MiniBooNE (MB) while maintaining compatibility with the null result from KARMEN, ii) obtain, in the process, a portal to the dark...
In high energy physics, Machine Learning (ML) has been applied to a broad range of problems: from jet tagging to particle identification, from the separation of signal over background, to fast simulation of event data, to to name a few. In this presentation, ML algorithms and techniques are explored to form lepton pairs (di-leptons) in a dark fermionic model.
In this model, the final-state...
The possibility that tiny violations of Lorentz invariance may occur in nature and be detectable with existing technology has been intensely pursued for over two decades. Despite there being no indication for Lorentz violation, many potential signatures, particularly in the QCD and electroweak sectors, remain critically unexamined. Recent theoretical work on Lorentz violation grounded in...
Some new physics extensions of the Standard Model predict that the 125 GeV Higgs boson can be a portal to invisible dark matter candidates through its decay. Direct searches for Higgs boson decay to invisible particles are a convenient way to explore this scenario. I present the results of a search for invisible decays of the Higgs boson produced through the vector boson fusion channel (+low...
The muon campus program at Fermilab includes the Mu2e experiment that will search for a charged-lepton flavor violating processes where a negative muon converts into an electron in the field of an aluminum nucleus, improving by four orders of magnitude the search sensitivity reached so far.
Mu2e’s Trigger and Data Acquisition System (TDAQ) uses {\it otsdaq} as its solution. Developed at...
A common assumption about the early universe is that it underwent an electroweak phase transition (EWPT). Though the standard model (SM) is able to restore the electroweak symmetry through a smooth cross over PT, we require a strongly first-order PT to ensure electroweak baryogenesis, requiring us to look at new physics beyond the SM. The simplest case to extend the SM is to add a real singlet...
The long-baseline neutrino oscillation experiments depend on detailed models of neutrino interactions on nuclei. However, these models constitute an important source of systematic uncertainty partly due to the missing information of the final state neutrons in the detectors to date. As such, neutron information is desired in the near detectors of upcoming long-baseline neutrino experiments....
What happens when we collide light at the highest laboratory energies? LHC beams source energetic photons that can collide to create new particles. Recently, ATLAS reported the landmark observation of photon-induced W boson pairs in the electron–muon channel using 139 fb$^{−1}$ of $\sqrt{s}$ = 13 TeV proton–proton collision data. A hallmark of photon fusion production is the forward scattering...
Neutrino oscillations in matter provide a unique probe of new physics. Leveraging the advent of neutrino appearance data from NOvA and T2K in recent years, we investigate the presence of CP-violating neutrino non-standard interactions in the oscillation data. We first show how to very simply approximate the expected NSI parameters to resolve differences between two long-baseline appearance...
We investigate the effects of producing dark matter by Hawking evaporation of primordial black holes (PBHs) in scenarios that may have a second well-motivated dark matter production mechanism, such as freeze-out, freeze-in, or gravitational production. We show that the interplay between PBHs and the alternative sources of dark matter can give rise to model-independent modifications to the...
The ATLAS experiment is currently preparing for an upgrade of the inner tracking detector for High-Luminosity Large Hadron Collider (LHC) operation, scheduled to start in 2027. The new detector, known as the Inner Tracker or ITk, employs an all-silicon design with five inner Pixel layers and four outer Strip layers. The staves are the building blocks of the ITk Strip barrel layers. Each stave...
Any measurably large elementary particle electric dipole moment (EDM) would constitute physics beyond the standard model. Based on frozen spin polarized beam control technology developed at the COSY laboratory in Juelich, Germany, a conceptual design is presented for a storage ring (PTR) capable of measuring proton (p) and deuteron (d) EDMs. Superimposed electric and magnetic bending make...
The MicroBooNE detector has an active mass of 85 tons of liquid argon and is located along the Booster Neutrino Beam (BNB) at Fermilab. It has a rich physics program including the search for a low-energy excess observed at MiniBooNE and measurements of neutrino-Argon interaction cross sections. In this talk, we present a procedure, using the Wiener-SVD unfolding method, to extract the nominal...
Detectors based on Chemical Vapor Deposition (CVD) diamond have been used
successfully in beam conditions monitors in the highest radiation areas of
the LHC. Future experiments at CERN will accumulate an order of magnitude
larger fluence. As a result, an enormous effort is underway to identify
detector materials that can operate after fluences of 10^{16}/cm^2 and
10^{17}/cm^2.
Diamond...
The construction of a mathematically rigorous relativistic quantum theory has so far remained elusive. Within the 'axiomatic quantum field theory in curved spacetime' research program it has been acknowledged that such a theory needs to be compatible with the general-relativistic conception of a spacetime. That is, one may not rely on the symmetries of Minkowski spacetime in formulating the...
The talk presents a search for a new leptophilic vector boson Z' decaying into the four-muon final state using the data collected by ATLAS detector in the year 2015-2018. A moderate excess of 4𝜇 events with a 𝜇+𝜇− pair is the experimental signature for this study. The gauge boson Z' is predicted by the highly motivated gauged 𝐿𝜇−𝐿𝜏 model, which is the simplest extension of the Standard Model...
Rare nuclear isotope accelerator facilities require high-intensity proton beams to produce different types of nuclear isotopes more copiously. Such requirements provide an excellent opportunity to search for dark-sector particles such as axion-like particles(ALPs). This presentation will introduce an experimental proposal called DAMSA (Dump-produced Aboriginal Matter Searches at Accelerator)...
We investigate Hawking evaporation of a population of primordial black holes (PBHs) as a novel mechanism to populate a dark sector which consists of self-interacting scalar dark matter with pure gravitational coupling to the visible sector. We demonstrate that depending on initial abundance of PBHs and the dark matter mass, the dark sector can reach chemical equilibrium with a temperature...
I’ll discuss precision calculations of dark radiation in the form of gravitons coming from Hawking evaporation of spinning primordial black holes (PBHs) in the early Universe. This calculation incorporates a careful treatment of extended spin distributions of a population of PBHs, the PBH reheating temperature, and the number of relativistic degrees of freedom. Results are compared to...
We will present our recent effort in computing the dynamics of binary black hole systems at the 3rd post-Minkowskian order. Our approach is based on the numerical unitarity method for the computation of multi-loop scattering amplitudes for massive particles in Einstein-Hilbert Gravity.
As nuclear and particle physics facilities move to higher intensities, the
detectors used there must be more radiation tolerant. Diamond is in use at
many facilities due to its inherent radiation tolerance and ease of use. We
will present radiation tolerance measurements of the highest quality
poly-crystalline Chemical Vapor Deposition (pCVD) diamond material for
irradiations from a range...
In collider experiments, very light new particles are produced in the far-forward direction with small angle relative to the beam axis. The ForwArd Search ExpeRiment (FASER) is aptly located 480 m downstream from the ATLAS interaction point where background is minimal. The FASERnu emulsion detector, positioned just upstream of FASER, will detect collider-produced neutrinos for the very first...
The AlCap experiment is an experiment conducted at PSI (Switzerland) that studies products of muon capture on aluminum, titanium. These materials are candidates for stopping targets in the next-generation of charged lepton flavor violation experiments, namely Mu2e at Fermilab and COMET at J-PARC, which will search for the neutrinoless conversion of muons to electrons in the nuclear fields....
Charged-current quasielastic scattering is the signal process in modern neutrino oscillation experiments. It also serves as the main tool for the reconstruction of the incoming neutrino energy. Exploiting effective field theory, we factorize neutrino-nucleon quasielastic cross sections into soft, collinear, and hard contributions. We evaluate soft and collinear functions from QED and provide a...
Data acquisition (DAQ) tests of the RD53a single chip cards (SCC) using Yet Another Rapid Readout (YARR), Front-End Link eXchange (FELIX) and Reconfigurable Cluster Element (RCE) readout systems are performed. Test stand for the DAQ tests of RD53a SCC was assembled at the SLAC National Accelerator Laboratory. YARR is the system developed for readout of up to 4 SCC or one quad module. It is...
With the discovery of the Higgs boson in 2012 by the CMS and ATLAS experiments, searches for new heavy particles (such as vector-like quarks) have ensued in hope of solving the hierarchy problem. In this talk, I will be discussing the search for the X5/3, a strongly interacting fermionic partner of the top quark with charge +5/3. Left-handed and right-handed coupling of the X5/3 to W bosons...
The search for the electroweak VBS production of a VW pair plus two jets in the semi-leptonic final state is presented. The full CMS dataset (137.1 fb-1) for the LHC Run II of proton-proton collisions at a center-of-mass energy of 13 TeV is analyzed. In the final state, we expect two well-separated jets with a high invariant mass, one lepton from the W boson decay, and the decay products of...
Everything in the Universe has its own structure; every structure is in harmony with the others; solar system, Milky Way, black holes, other systems of star around, etc. Also, electron which is one of the main subatomic particles is no exception. We could find electron in two different states: ground or exited state. Regardless of how it gets excited, we realize that it wants to return to the...
Rare nuclear isotope accelerator facilities provide high-flux proton beams to produce a large number of rare nuclear isotopes. The high-intensity nature of their beams enables investigating dark-sector particles including axion-like particles (ALPs). In this talk, we will discuss detection prospects of ALP, using its coupling to Standard Model photons, in DAMSA (Dump-produced Aboriginal Matter...
Identifying $𝑊𝑊^{(\ast)}\rightarrow\ell\nu qq$ from heavy particle decays at the LHC is an important but challenging problem due to overlapping lepton and jet signatures. We have developed a deep learning-based $𝑊𝑊^{(\ast)}$ tagger which learns from simulated calorimeter features to identify boosted $𝑊𝑊^{(\ast)}$ decays to semileptonic final states from $t\bar{t}$ and di-jet backgrounds in...
The High Luminosity upgrade of Large Hadron Collider (HL-LHC) will increase
the LHC Luminosity by an order of magnitude increasing with it the density
of particles on the detector by an order of magnitude. For protecting the
inner detectors of experiments and for monitoring the delivered luminosity,
a radiation hard beam monitor is being developed. For ATLAS we are developing
a set of...
Clifford algebra is the math language of quantum mechanics, known to most physicists in the matrix representations of Pauli and Dirac. Less familiar (but far more intuitive) is the original geometric intent of Clifford, the algebra of interactions of fundamental geometric objects - point, line, plane, and volume elements. In geometric representation, the 3D vacuum wavefunction is comprised of...
The AlCap experiment has measured the emission rate and energy spectra of protons, deuterons, tritons and alpha particles associated with the nuclear capture of muons stopped in Al, Si, and Ti at PSI. These measurements quantify an important nuclear physics hit background to the Mu2e and COMET experiments, which will search for charged lepton flavor violation at an unprecedented level of...
Primordial black holes (PBHs), possibly formed via gravitational collapse of large density perturbations in the very early universe, are one of the earliest proposed and viable dark matter (DM) candidates. Recent studies indicate that PBHs can make up a large or even entire fraction of the present day DM density for a wide range of masses. Ultralight
PBHs in the mass range of 10^{15} -...
The T2K experiment is a long base-line neutrino oscillation experiment which is designed to measure $\nu_\mu$ disappearance and $\nu_e$ appearance from the $\nu_\mu$ beam produced from a 30 GeV proton beam at J-PARC(Japan Proton Accelerator Research Complex). It consists of the J-PARC accelerator, a near detector complex (ND280) and a far detector (Super-Kamiokande). In order to achieve more...
GRAMS (Gamma-Ray and AntiMatter Survey) is a next-generation proposed balloon/satellite mission that will be the first to target both MeV gamma-ray observations and antimatter-based indirect dark matter searches with a LArTPC (Liquid Argon Time Projection Chamber) detector. Astrophysical observations at MeV energies have been poorly explored and long-neglected. With a cost-effective,...
The total decay width of the Higgs has not yet been constrained precisely, which allows for up to 11% of the branching fraction to be from beyond the standard model decays, so the Higgs Decay represents one possible way for Dark Matter(DM) searches. This talk will discuss the search for invisibly decaying Higgs boson or DM particles produced in association with a Z boson that decays into an...
Lorentz violation has been a popular topic in recent year in the search for experimental signals beyond known physics. We build the general Lorentz-violating terms in the context of effective field theory and analyze measurements in different gravity potentials, comparisons of gravitational accelerations, interferometer experiments, and studies of neutron gravitational bound states to extract...
A new silicon-strip charged-particle tracking detector (ITk strips) is a major component of the future upgrade of the ATLAS experiment for the high-luminosity LHC. The Autonomous Monitoring and Control (AMAC) chip is an application-specific integrated circuit designed to monitor voltages, currents and temperatures on each ITk module, and to control power to the front-end electronics. The ASIC...
We study inelastic neutrino-nucleus scattering. Primarily we target $^{40}Ar, ^{133}Cs$, and $^{127}I$ nuclei. Nuclear shell model provides clear understanding of nuclei. In practice we use Bigstick, which is based on nuclear shell model, to generate the numerical results of the nuclear structure. We also include spin-independent and spin-dependent neutrino-nucleus currents based on chiral...
The search for new physics at the energy frontier has a strong model-based foundation, with well-motivated theories informing the phase space that is subsequently investigated in data. This strategy has been effective for decades in establishing the Standard Model, culminating in the 2012 discovery of the Higgs boson with the Large Hadron Collider (LHC). Recent developments in machine learning...
The Drell-Yan process is studied in the framework of TMD factorization in the Sudakov region $s\gg Q^2\gg q_\perp^2$
corresponding to recent LHC experiments with $Q^2$ of order of mass of Z-boson and transverse momentum
of DY pair $\sim$ few tens GeV. The DY hadronic tensors are expressed in terms of quark and quark-gluon TMDs
with ${1\over Q^2}$ and ${1\over N_c^2}$ accuracy.
It is...
The LIGO/Virgo collaboration is making astonishing discoveries at a fantastic pace, including a heavy binary black hole merger with component masses in the “black hole mass gap,” which cannot be explained by standard stellar structure theory. In this talk, I will discuss how new light particles that couple to the Standard Model can act as an additional source of energy loss in the cores of...
All experimental data is consistent with massless neutrinos. There exist possibilities other than rest mass differences to explain oscillation. The two-component photon wavefunction is comprised of electric and magnetic flux quanta, coupled by Maxwell's equations. In the basic photon-electron interaction of QED, opposing phase shifts of the electron's inductive and capacitive impedances...
MicroBooNE is an 85-ton active mass liquid argon time projection chamber (LArTPC) at Fermilab. Its excellent calorimetry and resolution (both spatial and energy), along with its exposure to two neutrino beamlines make it a powerful detector not just for neutrino physics, but also for Beyond the Standard Model (BSM) physics and astroparticle physics. The experiment has competitive sensitivity...
Future operation of the LHC and HL-LHC will record a higher number of proton-proton collisions and therefore yield larger data rates and sample sizes. This will further stress real-time triggering systems and offline event reconstruction. Therefore, heterogenous computing systems utilizing both CPU and GPU hardware are being developed at CMS to deal with these tasks. Specifically, the precise...
The extended excess towards the Galactic Center (GC) in gamma rays inferred from Fermi-LAT observations has been interpreted as being due to dark matter (DM) annihilation. In a recent paper my collaborators and I performed a new likelihood analyses of the GC and showed that when including templates for the stellar galactic and nuclear bulges, the GC shows no significant detection of a DM...
The Accelerator Neutrino Neutron Interaction Experiment (ANNIE) experiment is a 26-ton gadolinium-loaded water Cherenkov detector located on the Booster Neutrino Beam at Fermilab. The experiment has a two-fold motivation: to perform a physics measurement and to advance new detector technologies. The measurement of final state neutron multiplicity from neutrino interactions in water as a...
A new silicon strip charged particle detector (ITk strips) is a major component of the future upgrade of the ATLAS experiment for the high luminosity LHC. The Autonomous Monitoring and Control (AMAC) chip is an application specific integrated circuit designed to monitor voltages and currents on each ITk module, and to control power to the front-end readout electronics. To guarantee the...
The LIGO-Virgo Collaboration has so far detected around 90 black holes, some of which have masses larger than what were expected from the collapse of stars. The mass distribution of LIGO-Virgo black holes appears to have a peak at ∼ $30M_\odot$ and two tails on the ends. By assuming that they all have a primordial origin, we analyze the GWTC-1 (O1&O2) and GWTC-2 (O3a) datasets by performing...
We propose that the dynamics of a scalar $\phi$ of mass $O(10)$ MeV, weakly coupled to the Higgs, can give rise to a first order electroweak phase transition. Vacuum stability close to the weak scale requires a suppressed (maybe vanishing) top Yukawa coupling before the transition, rising to the Standard Model (SM) value later. All SM flavor could appear similarly, after the electroweak phase...
Reconstruction of charged particle trajectories (tracks) in the tracking detector surrounding the interaction region is a key component of the event reconstruction in the ATLAS experiment at the Large Hadron Collider.
The ATLAS Inner Detector (ID) records up to 1500 individual signals (hits) per proton-proton collision, and between 20 and 60 collisions happen simultaneously at each bunch...
The Deep Underground Neutrino Experiment (DUNE) is a long baseline neutrino experiment using liquid argon detectors to study neutrino oscillations, proton decay, and other phenomena. The single-phase ProtoDUNE detector is a prototype of the DUNE far detector and is located in a charged particle test beam at CERN. It is critical to have accurate momentum estimation of charged particles for...
We explore the theoretical constraints on the observable parameters of neutrino mixing on predictions for the leptonic Dirac CP-violating phase within a class of theoretical models that include a single source of CP violation due to charged lepton corrections. As a means to enforce unitarity of the lepton mixing matrix, we assume specific ansatzes for the probability distributions of the...
We present a search for the lepton-flavor-violating decays $B^0→\tau^\pm\ell^\mp$, where $\ell= (e,\,\mu)$, using the full data sample of $772×10^6$ $B\overline B$ pairs recorded by the Belle detector at the KEKB asymmetric-energy $e^+e^−$ collider. We use events in which one $B$ meson is fully reconstructed in a hadronic decay mode. The $\tau^\pm$ lepton is reconstructed indirectly using the...
Two-Higgs-Doublet model with an additional scalar (2HDM+a) belongs to a generic class of mediator-based dark matter models which have garnered considerable theoretical and experimental interest over the past few years.
This presentation talks about the the constraints on this model using 13 TeV collision data collected by the ATLAS detector at the LHC , with multiple analyses and combination...
Sophisticated machine learning techniques have promising potential in search for physics beyond Standard Model in Large Hadron Collider (LHC). Convolutional neural networks (CNN) can provide powerful tools for differentiating between patterns of calorimeter energy deposits by prompt particles of Standard Model and displaced particles coming from decay of long-lived particles predicted in...
The Cherenkov Telescope Array (CTA) is the next-generation ground-based observatory for very-high-energy (VHE, E>100 GeV) gamma-rays. It will consist of more than 100 imaging atmospheric Cherenkov telescopes (IACTs) divided between two arrays in the Northern and the Southern hemispheres. Featuring telescopes with different sizes, it will provide coverage of the whole sky over a wide energy...
The Hybrid Controller Chip (HCC) is an application specific integrated circuit designed as part of the silicon strip detector for the ATLAS Inner Tracker (ITk), which will be installed as part of the High Luminosity LHC upgrade program. A prototype of the HCC was produced and tested in 2018 and 2019, and the production version is currently being prepared. The HCC must read out clustered hit...
An exercise using the value 2.5549x10^59, which is a value that is equal to the equations G/lp^2 and 2Pic^3/h, and that substitutes this value for the Gravitational Constant G in the derived Planck units was performed. The new values were then placed into a matrix chart that compares the newly derived values, dimensions, and magnitudes for both equations as they are used within each derived...
The measurement of the production of a $W$ boson with a $c$ quark (termed ''$W + c$ analysis'') is studied with the ATLAS detector using the full Run 2 dataset of $pp$ collisions at $\sqrt{s} = 13 \; \mathrm{TeV}$. This measurement is crucial in obtaining increasingly precise values of the $s$ and $\bar{s}$ parton distribution function (PDF) of the proton, as well as studying the physics of...
The discovery of diffuse sub-PeV gamma-rays by the Tibet ASγ collaboration promises to revolutionize our understanding of the high-energy astrophysical universe. It has been shown that this data broadly agrees with prior theoretical expectations. In this talk, We will discuss the impact of this discovery on a well-motivated new physics scenario: PeV-scale decaying dark matter (DM). Considering...
The ATLAS detector was designed to detect prompt particles from the LHC. A pair of long-lived particles, as part of a new Hidden Sector added to the Standard Model, would lead to challenging reconstruction and differentiating from background in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector. The two main backgrounds to a search for such long-lived particles are QCD multijet and...
We explore the implications of recent nucleon axial form factor lattice calculations for neutrino scattering experiments.
The Hybrid Controller Chip (HCC) is an application specific integrated circuit that's part of the front-end electronics for the new ATLAS Inner Tracker Strip detector, which will be installed as part of the High Luminosity LHC upgrade program. A prototype of the HCC was produced and tested in 2018 and 2019, and the production version is currently being prepared. The HCC must read out clustered...
The THDMa is a new physics model that extends the scalar sector of the Standard Model by an additional doublet as well as a pseudoscalar singlet and allows for mixing between all possible scalar states. In the gauge eigenbasis, the additional pseudoscalar serves as a portal to the dark sector, with a priori any dark matter spin states. The option where dark matter is fermionic is currently one...
A rate of 60 or more inelastic collisions per beam crossing was observed during LHC Run 2 and even higher vertex density, or pile-up, is expected in Run 3 and Run 4. Efficient and precise reconstruction of the primary vertex in proton-proton collision is essential for determining the full kinematic properties of the hard-scatter event and of soft interactions. Increasing instantaneous...
The monitored drift tube (MDT) chambers are the main component of the precision tracking system in the ATLAS muon spectrometer, capable of measuring the sagitta of muon tracks to an accuracy of 60 μm, which corresponds to a momentum accuracy of about 10% at pT=1 TeV. To cope with large amount of data and high event rate at HL-LHC, the present MDT readout electronics will be replaced and the...
The data set provided by the Large Hadron Collider, with an integrated luminosity of 139.0 fb$^{-1}$ at a center-of-mass energy of $\sqrt{s}=13$ TeV, opens a window to search for new physics beyond the Standard Model (BSM). Searches for a resonance in the dijet mass spectrum are powerful probes of many BSM theories. For particles decaying into light-flavor quarks, inclusive searches provide...
The Deep Underground Neutrino Experiment (DUNE) is a next-generation long-baseline neutrino experiment. Its main physics goals are the precise measurement of the neutrino oscillation parameters, in particular the violation of the charge-parity symmetry and the neutrino mass hierarchy. DUNE consists of a Far Detector (FD) complex with four multi-kiloton liquid argon detectors, and a Near...
The increasing number of high-performance computing centers around the globe is providing physicists and other researchers access to heterogeneous systems -- comprising multiple central processing units and graphics processing units per node -- with various platforms. However, it is more often than not the case that domain scientists have limited resources such that writing multiple...
Don't accept this abstract.
Do not schedule this abstract.
Next generation neutrino experiments will push the limits in our understanding of astroparticle physics in the neutrino sector to energies orders of magnitude higher than the current state-of-the-art high-energy neutrino experiment, IceCube. These experiments will use neutrinos to tell us about the most extreme environments in the universe, while simultaneously leveraging these extreme...
