Particle Physics on the Plains​ 2019

12 Oct 2019, 08:15 → 13 Oct 2019, 23:10 US/Central

2048 Mallot Hall (University of Kansas)

Ian Lewis (The University of Kansas)

If you have not secured lodging, please do so ASAP.  There are two other events happening at the University of Kansas the same weekend:  NASA Eyes KU NASA’s 60th anniversary Symposium and the 2019 GPRM-AAG Annual Meeting.  This may make lodging more difficult.

 

Particle Physics on the Plains will be held on October 12-13, 2019, at the University of Kansas. The workshop facilitates a discussion about the latest results in particle phenomenology and theory among  particle theorists in the region.

Talks are intended to be mostly student/postdoc talks.  If there is room in the schedule, we will add faculty talks.  Nevertheless, this is an excellent opportunity for faculty to keep up on research in the region and gather for lengthy discussions.

September 8, 2019  There are funds available to help support lodging for students and postdocs who give talks. To be eligible for these funds students/postdocs must register and submit a talk abstract by 11:59 pm CDT September 8, 2019.  Preference will be given to regional theoretical particle physics students/postdocs.  However, provided funds are available, we will support the lodging of additional students/postdocs.  Further details are on the registration and lodging pages.

September 11, 2019  Deadline for hotel reservation under our group rate at the DoubleTree.  Information can be found on the lodging page.

September 28, 2019 Registration closes at midnight CDT.

Invited Guest Speaker:  Tim Tait (UC-Irvine) Tim has had to cancel.

 

Talks will be held in 2048 Malott Hall.  The main entrance of Malott Hall is on the Northern side with multiple doors.  This entrance is on the second floor.

Lunch on Saturday, coffee breaks, and a simple breakfast of bagels on Saturday and Sunday will be provided during the workshop.

Driving directions on Google maps from the hotel to campus can be found on the lodging page.

Walking directions on Google maps from the parking lots to the main Northern entrance of Malott Hall can be found on the parking and maps page.

This workshop is supported in part by the Research Excellence Initiative of the College of Liberal Arts and Sciences at the University of Kansas, US-DOE, and the University of Kansas Department of Physics & Astronomy.

Previous year's website:  2017  and  2018

Organizers: Li Huang, Jeong Han Kim, KC Kong, Ian Lewis (chair), Douglas McKay, John Ralston, Yajuan Zheng

Saturday 12 October

Registration/Bagels

Welcome: Associate Dean for Science Research Joy Ward and Ian Lewis

1 Welcome: Associate Dean for Science Research Joy Ward and Ian Lewis

Speakers: Ian Lewis (The University of Kansas), Prof. Joy Ward

Pic_resolution1.pdf

Welcome.pdf

Phase Transitions/Models

Convener: Kuver Sinha (University of Oklahoma)

2 Strong First-Order Electroweak Phase Transitions in the Standard Model with a Singlet Extension

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 field, which allows first-order EWPTs (FOEPT) to occur.

Starting with the most general higgs+singlet lagrangian, we then fixed four of its coupling constants as functions of parameters whose range of values had more experimental motivation. Then by requiring a FOEPT and performing a Monte-Carlo scan over five free parameters, we were able to study the parameter space in this allowed region. Most notably, we observed the triple higgs coupling ($\lambda_3$) take on values between 1.2 and 2.5. The possible values of $\lambda_3$ could serve as motivation for future collider experiments to improve sensitivity in this range when looking at the cross sections of pp—>hh versus $\lambda_3$.

Speaker: Anthony Hooper (University of Nebraska-Lincoln)

FOEPT_in_the_SM_with_a_Singlet_Extension.A.Hooper.pdfversion.pdf

FOEPT_in_the_SM_with_a_Singlet_Extension.A.Hooper.pptx

3 Collider and Gravitational Wave Complementarity in Exploring the Singlet Extension of the Standard Model

We present a dedicated complementarity study of gravitational wave and collider measurements of the simplest extension of the Higgs sector: the singlet scalar augmented Standard Model. We study the following issues: (i) the electroweak phase transition patterns admitted by the model, and the proportion of parameter space for each pattern; (ii) the regions of parameter space that give detectable gravitational waves at future space-based detectors; and (iii) the current and future collider measurements of di-Higgs production, as well as searches for a heavy weak diboson resonance, and how these searches interplay with regions of parameter space that exhibit strong gravitational wave signals. We carefully investigate the behavior of the normalized energy released during the phase transition as a function of the model parameters, address subtle issues pertaining to the bubble wall velocity, and provide a description of different fluid velocity profiles. On the collider side, we identify the subset of points that are most promising in terms of di-Higgs and weak diboson production studies while also giving detectable signals at LISA, setting the stage for future benchmark points that can be used by both communities.

Speaker: Dan Vagie

PPP-2019.pdf

4 Electroweak Symmetry Non-restoration in Models with New Fermions

In this talk, I am going to explore the possibility that electroweak phase transition may never occur in the early universe. It is known that the symmetries of some scalar models are not restored at high temperature, or some symmetries that are unbroken at low temperature becomes broken at higher temperature. These phenomena are known as Symmetry Non-restoration (SNR) and Inverse Symmetry Breaking (ISB) respectively. In this talk, I will identify the models with new fermions that has unstored electroweak symmetry at high temperature, and discuss their phenomenological signatures in cosmology and neutrino experiments.

Speaker: Yu Hang Ng (University of Nebraska-Lincoln)

EWSNR_TR.pdf

5 Naturalness versus stringy naturalness (with implications for collider and dark matter searches)

The notion of stringy naturalness– that an observable O2 is more natural than O1 if
more (phenomenologically acceptable) vacua solutions lead to O2 rather than O1– is
examined within the context of the Standard Model (SM) and various SUSY extensions:
CMSSM/mSUGRA, high-scale SUSY and radiatively-driven natural SUSY (RNS). Rather
general arguments from string theory suggest a (possibly mild) statistical draw towards
vacua with large soft SUSY breaking terms. These vacua must be tempered by an anthropic veto of non-standard vacua or vacua with too large a value of the weak scale
mweak. We argue that the SM, the CMSSM and various high-scale SUSY models are all
expected to be relatively rare occurances within the string theory landscape of vacua. In
contrast, models with TeV-scale soft terms but with mweak ∼ 100 GeV and consequent
light higgsinos (SUSY with radiatively-driven naturalness) should be much more common
on the landscape. These latter models have a statistical preference for mh ' 125 GeV
and strongly interacting sparticles beyond current LHC reach. Thus, while conventional
naturalness favors sparticles close to the weak scale, stringy naturalness favors sparticles
so heavy that electroweak symmetry is barely broken and one is living dangerously close to
vacua with charge-or-color breaking minima, no electroweak breaking or pocket universe
weak scale values too far from our measured value. Expectations for how landscape SUSY
would manifest itself at collider and dark matter search experiments are then modified
compared to usual notions.

Speaker: Shadman Salam

KU_conference_talk_final_3.pdf

6 Anomaly mediated SUSY breaking model retrofitted for naturalness

Anomaly-mediated supersymmetry breaking (AMSB) models seem to have become increasingly implausible due to 1. difficulty in generating a Higgs mass $m_h$ $\sim$ 125 GeV, 2. typically unnatural superparticle spectra characterized by a large superpotential mu term and 3. the possibility of a wino-like lightest SUSY particle (LSP) as dark matter now seems to be excluded. In the present paper we propose some minor modifications to the paradigm model which solve these three issues. Instead of adding a universal bulk scalar mass to avoid tachyonic sleptons, we add distinct Higgs and matter scalar soft masses which then allow for light higgsinos. To gain accord with the measured Higgs mass, we also include a bulk trilinear soft term. The ensuing natural generalized AMSB (nAMSB) model then has a set of light higgsinos with mass nearby the weak scale $m(W,Z,h)$ $\sim$ 100 GeV as required by naturalness while the winos populate the several hundred GeV range and gluinos and squarks occupy the multi-TeV range. For LHC searches, the wino pair production followed by decay to same-sign diboson signature channel offers excellent prospects for discovery at high luminosity LHC along with higgsino pair production leading to soft dileptons plus jet(s)+MET. A linear $e^+e^-$ collider operating above higgsino pair production threshold should be able to distinguish the AMSB gaugino spectra from unified or mirage unified scenarios. Dark matter is expected to occur as a higgsino-like WIMP plus axion admixture.

Speaker: Dibyashree Sengupta (University of Oklahoma)

namsb_sengupta.pdf

Coffee

LHC

Convener: Peisi Huang (University of Nebraska-Lincoln)

7 Searching for Dark Photons with Maverick Top Partners

In this talk, we present a model using an up-type vector like quark (VLQ) charged under an additional U(1) gauge symmetry, whose gauge boson is a dark photon and which is broken via a new dark Higgs mechanism. While this model achieves a rich decay phenomenology, it also demonstrates two important features. First, traditional searches for Vector-Like Quarks (VLQs) rely on the decay into Standard Model electroweak bosons W, Z, or Higgs. However, in this model these traditional decays are significantly supressed, while new maverick decays of the VLQ into dark photons or a dark Higgs, dominate. This shows the need to develop searches for other novel signatures of VLQs. Second, dark photon production through the decay of the VLQ is independent of the small mixing parameter epsilon but instead depends on QCD gauge structure. This scenario provides a robust framework to search for a light dark sector via searches for heavy colored particles at the LHC. Furthermore with the rich phenomenology of dark photon decays, it provides a chance to explore prompt decays, displaced vertices, and long lived particles.

Speaker: Samuel Lane (University of Kansas)

VLT+DarkPhotons_Lane.pdf

8 Charming top decays with flavor changing Higgs boson and $\tau\tau$ at LHC

We study the prospect of discovering a rare $t \to c h^0$ decay in the top pair production channel at LHC. We follow a general two Higgs doublet model framework to investigate this signature, with Higgs decaying into $\tau \tau$ and another top decaying hadronically to a b quark and two light jets. We search for the following final states $b j j \ell^+ \ell^- + MET$ and $b j j \ell^{\pm} \tau_h + MET$, where $\tau_h$ refers to jets coming from $\tau$ decay. We present our Monte Carlo analysis using Delphes. We use boosted decision trees for discrimination at current and Future HL-LHC and HE-LHC.

Speaker: Rishabh Jain (University Of Oklahoma)

Rishabh_PPP_2019 .pdf

9 Next generation kinematic variables for signal discovery and measurement in colliders

High energy physics data, even at the parton level, is high dimensional. Analyzing the distribution of collider events in the full phase-space comes with several challenges--insufficient computational resources to scan the full phase-space, insufficient data to populate it, difficulty in validating monte carlo in the full phase-space, etc.

One way to address the curse of dimensionality is to reduce it. At the parton level, this is typically done by constructing kinematic event variables. But this dimensionality reduction is accompanied by information loss, so it becomes important to construct "good" event variables that capture the main features of the phase-space distribution and minimize information loss.

Construction of good event variables is a challenging task for event topologies with missing particles in the final state. In this talk we'll look at a new class of kinematic event "variables" that can produce mass bumps even for event topologies with missing particles. And in the process, we'll introduce a brand new way of visualizing and representing high dimensional data, which can open up a world of possibilities for new data analysis techniques.

Speaker: Prasanth Shyamsundar (University of Florida)

Presentation.pdf

10 A Projective Phase Space Generator for Vector Boson Plus Jet Production

In this talk I will present results obtained using the previously developed projective phase space generator for the calculation of the vector boson plus one jet at next-to-leading order in QCD. I will comment on the scalability of the projective phase space generator and further directions of the research.

Speaker: Terrance Figy (Wichita State University)

ParticlePhysicsOnThePlains_TMFigy_2019.pdf

ParticlePhysicsOnThePlains_TMFigy_2019.pptx

Lunch

Boxed lunches will be provided.

Dark Matter/BAU

Convener: Ahmed Ismail

11 PASSAT: Particle Accelerator helioScopes for Slim Axion-like-particle deTection

I discuss a novel method to search for axion-like particles (ALPs) at particle accelerator experiments. ALPs produced at the target subsequently enter a region with a magnetic ?field, where they are converted to photons that are then detected. Dubbed Particle Accelerator helioScopes for Slim Axion-like-particle deTection (PASSAT), this proposal uses the principle of the axion helioscope but replaces ALPs produced in the Sun with those produced in a target material. Since the search relies on ALP-photon conversions, PASSAT probes light (slim) ALPs that are otherwise inaccessible to laboratory-based experiments which rely on ALP decay, and complements astrophysical probes that are more model-dependent. I discuss how the idea of PASSAT is realized, taking NOMAD, CAST, and BabyIAXO experiments.

Speaker: Doojin Kim (University of Arizona (US))

Presentation_PPP_DoojinKim.pdf

Presentation_PPP_DoojinKim.pptx

12 Exotic(Dark) Compact Object Searches with Extreme Mass Ratio Inspirals

Exotic compact objects such as primordial black holes, boson star, etc., are theoretically predicted to exist and can make interesting dark matter candidates,
yet with no definitive observational evidence for their existence. This talk will
discuss a new method of using gravitational waves from the extreme mass ratio inspiral, formed by an ECO and a supermassive black hole in the center of each galaxy as a probe of the ECOs. The corresponding gravitational waves can be detected by future space-based interferometer gravitational wave detectors and
the mass of the ECO can be determined very precisely. Aside from gravitational wave signals, possible electromagnetic counterparts for some ECOs, like boson stars, will be discussed.

Speaker: Huaike Guo (University of Oklahoma)

Huaike.pdf

13 New approaches to explore dark matter and baryogenesis

Motivated by the absence of dark matter signals in dark matter direct search and new physics at LHC, we study new approaches to explore dark matter and baryogenesis
by SKA-like experiments and LISA-like experiments.

Speaker: Dr Fa Peng Huang (Washington University in St. Louis)

fphuang_12oct2019.pdf

14 Higgs Troika for Baryon Asymmetry

In order to explain the baryon asymmetry of the Universe, we extend the
Standard Model with two additional Higgs doublets with small vacuum expectation values and masses around the TeV scale. These additional Higgs fields introduce new sources of CP violation through complex Yukawa couplings with Standard Model fermions. We propose a flavor model where Yukawa couplings are $\mathcal{O}(1)$ or less for quarks and charged leptons. This model leads to high energy signals such as observable deviations in the 125 GeV Higgs decay into muons and taus and production of heavy scalars as well as low energy signals such as the electron EDM or $\mu\rightarrow e\gamma$.

Speaker: Matthew Sullivan (University of Kansas)

HiggsTroika.pdf

Coffee

Higgs

Convener: Dorival Gonçalves (University of Pittsburgh)

15 Comparative Study of VBF Higgs Production at the HE-LHC and HL-LHC

Since the discovery of the Higgs boson, particle physics community has explored the measurements of its properties, making processes involving Higgs production interesting and important in many different ways. The High-Luminosity Large Hadron Collider (HL-LHC) project aims to increase luminosity by a factor of 10 beyond the LHC’s design value after 2025. The High Energy Large Hadron Collider (HE-LHC) are designed for centre-of-mass energy at 27 TeV. In this talk I will discuss the prospects of studying vector boson fusion Higgs production at the HL-LHC and the HE-LHC respectively. In particular, the differential distributions of Higgs boson production for a set of typical analysis cuts has been investigated.

Speaker: Tinghua Chen (Wichita State University)

Tchen_particle_physics_on_the_Plain_2019.pdf

16 The Di-Higgs Photography with Deep Neural Networks

We search for a hint of new physics concealed in the structure of the Standard Model (SM) via double Higgs production. Focusing on a relatively overlooked bbWW* final state, we portray the full final state by treating a detector as a camera, and the streams of jets and leptons as images. We adopt various deep neural networks (DNN), which efficiently exploit the correlations among the images, to disentangle the SM Di-Higgs images of anomalous Higgs self-coupling from the SM backgrounds. The proposed method has a potential to improve the precise measurement of the Higgs self-coupling, and has a wide applicability to disentangle the higher dimensional operators in the effective field theories (EFT).

Speaker: Jeong Han Kim (University of Kansas)

Jeong_Han_Kim_2019.pdf

17 Non-resonant Higgs Production in Scalar Extended Model at the LHC

We investigate the collider signature of the real singlet extension of the standard model.
A definitive correlation exists between the strength of the phase transition and the trilinear coupling of the Higgs to two singlet-like scalars, and hence between the phase transition and non-resonant scalar pair production involving the singlet at colliders.
We study the prospects for observing these processes at the high luminosity LHC, focusing particularly on the associated production of singlet and the SM Higgs.

Speaker: Haider Alhazmi

PPP_Haider.pdf

18 Exotic Offshell Higgs Decay

We consider the Higgs exotic decay $h\rightarrow\eta \eta$ with $\eta$ a very narrow BSM pseudo-scalar and its constrain in high luminosity LHC. This $\eta$ couples to fermions by loop induce process so its major decay products are gauge bosons.

Speaker: Huang Li (University of Kansas)

LiHuang.pdf

19 Probing the top Yukawa coupling at the LHC via associated production of single top and Higgs

The conjoined production at the LHC of single top and Higgs boson via t-channel weak boson exchange is ideal to probe the top-quark Yukawa coupling, due to a delicate cancellation between the amplitudes with the htt and the hWW couplings. We find that the top quark is produced with 100% polarization in the leading order, and its quantum state is determined by the spin-vector direction in the t-quark rest frame. We relate the spin direction to the four-momenta of the top, Higgs and a jet in the helicity amplitude framework. We identify a polarization asymmetry that is sensitive to CP violation, even after partial integration over the forward jet momentum. This CP violating asymmetry may be observed at the LHC via the component of the top-quark polarization that is perpendicular to the th scattering plane.

Speaker: Ya-Juan Zheng

1012plain_zheng.pdf

NASA Eyes - KU NASA’s 60th anniversary Symposium - Public Engagement Section

Sunday 13 October

Registration/Bagels

Flavor

Convener: Kaladi Babu (Oklahoma State University)

20 New Fermions and the One-Loop Effective Action

Recently, there has been a growing interest in developing functional methods for calculating the Wilson coefficients of dimension-6 operators arising from integrating out heavy new fields at one loop. In this talk, we discuss the particularities of this method when applied to Vector-Like Fermions (VLFs), and illustrate it for a simple VLF model.

Speaker: Andrei Angelescu (University of Nebraska-Lincoln)

angelescu_plains2019.pdf

21 Distinguishing Lepton Flavor Violating Signals from Neutral and Doubly-Charged Scalars at Future Lepton Colliders

Many new physics scenarios beyond the Standard Model (SM) often
necessitate the existence of new neutral and/or doubly-charged scalar fields,
which might couple to the SM charged leptons in a flavor violating way,
while evading all existing constraints. At future lepton colliders like CLIC
the neutral and doubly-charged scalar might induce the lepton flavor
violating (LFV) signals with the same final states like e+ e- mu+ mu- and e+
e+ mu- mu-. However, the kinetic distributions of charged leptons such as
the invariant masses m_{e+ mu+} and m_{e+ mu-} can be used to
distinguish clearly the neutral and doubly-charged scalar mediated
processes.

Speaker: Fang Xu

PPP2019 - Fang Xu.pdf

22 Probing a Light Leptonic Scalar at the LHC

If a light neutral beyond standard model scalar $\phi$ couples exclusively to the active neutrinos, then the dominant production channel of such a light neutral scalar at the LHC is through the fusion of two same-sign $W$ bosons. As $\phi$ decays only into neutrinos, the production of $\phi$ at LHC induces the signal of same-sign dilepton plus two forward jets plus missing transverse energy. The proposed final state allows us to probe a large range of $m_\phi$ up to ~200 GeV where there is currently no direct LHC limit. The $\phi$ couplings $\lambda_{ee,\, e\mu,\, \mu\mu}$ to neutrinos can be probed respectively up to 0.75, 0.71 and 0.71 at the high-luminosity LHC, and the direct measurements of the $\phi$ couplings at the high-energy colliders are largely complementary to the low-energy limits.

Speaker: Dr Yongchao Zhang

light_scalar_PPP2019.pdf

23 Flavor Physics in Left-Right Symmetric Model

I will present the results of our analysis on flavor physics in Left-Right Symmetric Model which utilize vector-like fermions to generate quark and lepton masses via universal see-saw mechanism. A parity symmetric version is studied. New contributions to meson mixing and lepton universality violation will be presented. The possibilities of explaining B-anomalies in this context will also be explored.

Speaker: Ritu Dcruz

U-LRSM.pdf

Coffee

Neutrinos

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

24 General Treatment of Reflection of Spherical Electromagnetic Waves from the Spherical, Uneven Antarctic Surface and its Implications for the Mystery Events detected by ANITA detector.

The NASA sponsored balloon-borne ANITA detector operating in Antarctica is designed to detect ultra high energy cosmic rays (UHECR) with energies exceeding 1 EeV ($10^{18}$ eV) by collecting the radio pulse generated through the interaction of the primary particle with Earth’s atmosphere. The radio pulse is detected after reflection from the Antarctic ice surface. For calibration and measurement of surface reflectivity, the balloon-borne HiCal radio-frequency (RF) transmitter is used. Here we are interested in determining the mean value of reflection coefficient over the range of frequencies which are of interest in HiCal observations.

In this talk, I will discuss a general formalism that we have developed to treat reflection of spherical electromagnetic waves from a spherical surface. Our main objective is interpretation of radio wave signals produced by cosmic ray interactions with Earth’s atmosphere which are observed by the Antarctica based ANITA detector after reflection off the ice surface. The incident wave is decomposed into plane waves and each plane wave is reflected off the surface using the standard Fresnel formalism. For each plane wave the reflected wave is assumed to be locally a plane wave. This is a very reasonable assumption and there are no uncontrolled approximations in our treatment of the reflection phenomenon. The surface roughness effects are also included by using a simple model. We apply our formalism to the radiation produced by the balloon-borne HiCal radio-frequency (RF) transmitter. The final results for the reflected power are found to be in good agreement with data for all elevation angles. We also study the properties of reflected radio pulses in order to study their phase relationship with direct pulses. We find that for some roughness models the pulse shape can be some what distorted and may be misidentified as a direct pulse. The effect of various surface roughness models on the pulse shape will also be discussed. In this talk, I will also explain that our proposed roughness model, suitable for actual Antarctic surface topography is able to provide an explanation for the observed mystery events by ANITA.

Speaker: Paramita Dasgupta (PhD student at Indian Institute of Technology Kanpur)

PPP2019_paramita.odp

PPP2019_paramita.pdf

PPP2019_paramita.pdf

25 Constraining Scalar Non-Standard Interactions

Non-Standard Interactions (NSI) of neutrinos with matter are important to understand, as they could significantly alter the standard 3-neutrino oscillation paradigm. While vector NSI contribute as a change in the matter potential for the propagating neutrinos, scalar NSI show up as a correction to the neutrino mass matrix. In this talk, we will discuss the field-theoretic origin of scalar NSI as an effect at finite density. We will also discuss various terrestrial and space-based experimental constraints on the scalar NSI parameter space.

Speaker: Garv Chauhan (Washington University in St. Louis)

Presentation_PPP_19 (1).pdf

26 Non-Standard Interactions in Radiative Neutrino Mass Models

Models of radiative Majorana neutrino masses require new scalars and/or fermions to induce lepton number violating interactions. We show that these new particles also generate observable neutrino nonstandard interactions (NSI) with the matter. We classify radiative models as type-I or II, with type-I models containing at least one Standard Model (SM) particle inside the loop diagram generating neutrino mass, and type-II models having no SM particle inside the loop. While type-II radiative models do not generate NSI at tree-level, popular models which fall under the type-I category are shown, somewhat surprisingly, to generate observable NSI at tree-level, while being consistent with direct and indirect constraints from colliders, electroweak precision data and charged lepton flavor violation (cLFV). We survey such models where neutrino masses arise at one, two and three loops. The most stringent constraints on the diagonal NSI are found to come from neutrino oscillation and scattering experiments, while the off-diagonal NSI are mostly constrained by low-energy processes, such as atomic parity violation and cLFV.

Speaker: anil thapa (Oklahoma State University)

NSI_PPP.pdf

27 Zee-Burst: A New Probe of Neutrino Non-Standard Interactions at IceCube

We propose a new way to probe non-standard interactions (NSI) of neutrinos with matter using the ultra-high energy (UHE) neutrino data at current and future neutrino telescopes. We consider the Zee model of radiative neutrino mass generation as a prototype, which allows two charged scalars -- one $SU(2)_L$-doublet and one a singlet, both being leptophilic, to be as light as 100 GeV, thereby inducing potentially observable NSI with electrons. We show that these light charged Zee-scalars could give rise to a Glashow-like resonance feature in the UHE neutrino event spectrum at the IceCube neutrino observatory and can probe a sizable fraction of the allowed NSI parameter space in the near future.

Speaker: Mr Yicong Sui (Department of Physics and McDonnell Center for the Space Sciences, Washington University, St. Louis)

presentation_for_PPP-expanded.pdf

28 Minimal Dirac Neutrino Mass Models from Generic One-loop and Two-loop Topologies

We carry out a systematic investigation of the minimal Dirac neutrino mass models emerging from generic one-loop and two-loop topologies that arise from $d=5$ effective operator with a singlet scalar, $\sigma$. To ensure that the tree-level Dirac mass, as well as Majorana mass terms at all order are absent for the neutrinos, we work in the framework where the Standard Model is supplemented by the well motivated $U(1)_{B-L}$ gauge symmetry. At one-loop level, we analyze six possible topologies, out of which two of them have the potential to generate Dirac neutrino masses. Adopting a systematic approach to select minimal models, we construct $18$ viable one-loop Dirac neutrino mass models. By repeating a similar methodical procedure at two-loop, we have worked out $22$ minimal candidates. Among these 40 economical models, majority of the models proposed in this work are new. In our search we have also included the scenarios where the particles in the loop carry charges under color.

Speaker: Mr Vishnu Padmanabhan Kovilakam (OKLAHOMA STATE UNIVERSITY)

VPK_Talk_kansas_final.pdf

VPK_Talk_kansas_final.pdf

VPK_Talk_kansas_final.pptx

29 Concluding Remarks

Speaker: K.C. Kong (University of Kansas)

PPP2019.pdf