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Particle Physics on the Plains 2022
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2001 Malott Hall (University of Kansas)
2001 Malott Hall
University of Kansas
Department of Physics & Astronomy
University of Kansas
Lawrence, KS
Description
Update March 25, 2022: The timetable of talks is now public.
Particle Physics on the Plains will be held on April 2-3, 2022, 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.
The format will be a hybrid. However, talks are preferred to be in person unless an accommodation is made or there are extenuating circumstances. Accommodations are are on a case-by-case basis and can be made by contacting the organizers.
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.
March 1, 2022 There are funds available to help support lodging for students and postdocs who give talks. TTo be eligible for these funds students/postdocs must register and submit a talk abstract by 11:59 pm CDT March 1, 2022. 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.
March 4, 2022 Deadline for hotel reservation under our group rate at the Hampton Inn. Information can be found on the lodging page.
March 24, 2022 March 27, 2022 Registration closes at midnight CDT.
Confirmed Invited Speakers: Tao Han (University of Pittsburgh) and Tim Bolton (Kansas State University) have agreed to attend on Saturday and give a talks at Particle Physics on the Plains this year. Tim Bolton will give a neutrino experiment overview.
Masks are strongly encouraged. Information about COVID-19 regulations at KU can be found here: https://protect.ku.edu/
Lunch on Saturday and coffee breaks will be provided during the conference.
Driving directions on Google maps from the hotel to campus can be found on the lodging 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, 2018, 2019
Organizers: KC Kong, Ian Lewis (chair), Samuel Lane, Douglas McKay, John Ralston, Yajuan Zheng
Contact
Participants
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1
Conference Chair Announcements 2001 Malott Hall
2001 Malott Hall
University of Kansas
Department of Physics & Astronomy University of Kansas Lawrence, KS -
Session 1 2001 Malott Hall
2001 Malott Hall
University of Kansas
Department of Physics & Astronomy University of Kansas Lawrence, KSConvener: Francesc Ferrer (Washington University in St Louis)-
2
Natural SUSY emergent from the landscape
In string theory with flux compactifications, anthropic selection for structure formation
from a discretuum of vacuum energy values provides at present our only understanding of
the tiny yet positive value of the cosmological constant. We apply similar reasoning to a
toy model of the multiverse restricted to vacua with the MSSM as the low energy effective
theory. Here, one expects a statistical selection favoring large soft SUSY breaking terms
leading to a derived value of the weak scale in each pocket universe (with appropriate
electroweak symmetry breaking) which differs from the weak scale as measured in our
universe. In contrast, the SUSY preserving µ parameter is selected uniformly on a log
scale as is consistent with the distribution of SM fermion masses: this favors smaller values
of µ. An anthropic selection of the weak scale to within a factor of a few of our measured
value– in order to produce complex nuclei as we know them (atomic principle)– provides
statistical predictions for Higgs and sparticle masses in accord with LHC measurements.
The statistical selection then more often leads to (radiatively-driven) natural SUSY models
over the Standard Model or finely-tuned SUSY models such as mSUGRA/CMSSM, split,
mini-split, spread, high scale or PeV SUSY. The predicted Higgs and superparticle spectra
might be testable at HL-LHC via higgsino pair production but is certainly testable at
higher energy hadron colliders with √s ∼ 30 − 100 TeV.Speaker: Mohammed Salam -
3
muon g-2 and the B-physics anomalies in RPV supersymmetry and the discovery prospect at LHC
In R-parity violating supersymmetric scenario, assuming the third-generation superpartners to be the lightest (calling the scenario RPV3), we show that there are some benchmark scenarios in which $R_{D^{(∗)}}$, $R_{K^{(∗)}}$ and $(g−2)_μ$ anomalies can be addressed and also can be detected at 14 TeV LHC or future hadron colliders.
Speaker: Fang Xu -
4
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 for a first-order EWPTs (FOEPT) to occur.
Starting with the most general higgs+singlet lagrangian, we fixed four of its coupling constants as functions of the three quartics, the singlet and higg’s mass and vacuum expectation value, whose range of values had more experimental motivation than the former. We ran a Monte-Carlo scan over these five free parameters, requiring a FOEPT and a PT strength of $\frac{v_c}{T_c} > 1.3$. These points were then passed through the FindBounce package to calculate the nucleation temperature. The resulting parameter space was studied, most notably, we observed the ratio of the triple higgs coupling to the SM value $\left(\kappa = \lambda_3/\lambda_3^{SM}\right)$ take on values between 0.86 and 2.2. 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 $pp\rightarrow hh$ versus $\lambda_3$.
Speaker: Anthony Hooper - 5
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2
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10:35
Coffee Break 2001 Malott Hall
2001 Malott Hall
University of Kansas
Department of Physics & Astronomy University of Kansas Lawrence, KS -
Session 2 2001 Malott Hall
2001 Malott Hall
University of Kansas
Department of Physics & Astronomy University of Kansas Lawrence, KSConvener: Andrew Ivanov (Kansas State University (US))-
6
Welcome from Vice Chancellor For Research Simon Atkinson
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7
CP-Violating Top Yukawa Coupling at the Multi-TeV Muon Collider (Part I)
The collisions of muons, as fundamental particles, offer a relatively clean environment compared to that of hadrons. At the same time, with a mass of over 200 times of an electron/positron, muons enable a combination of high center-of-mass energy with a clean collision environment that is not achieved yet by the current running colliders. Thus, the proposed Muon Collider has explicitly stood out of interest. We present our current results on the investigation of the top-quark and Higgs-boson coupling, which is not well constrained according to the most updated experiments, at a future Muon Collider. In this presentation, we talk about the pros \& cons of Muon Colliders and the analysis of the signals, $tth$, $tth\nu\nu$, and $tbh\mu\nu$, with various energies in both the Standard Model and CP-Violation Model.
Speaker: Yanzhe Zhang -
8
CP-Violating Top Yukawa Coupling at the Multi-TeV Muon Collider Part II
CP-Violation was first discovered in the weak interaction in the 1960s. Since its discovery, efforts have been made to find new sources of CP-Violation to account for matter anti-matter asymmetry. This project proposes a search for CP-Violation in the top Yukawa interaction through high energy muon collisions. Signal processes include $tth$, $tth\nu\nu$, and $tbh\mu\nu$ decaying semi-leptonically. We present cross-section dependence of signal processes with varying CP-phase, $\alpha$, at different center of momentum energies. We show luminosity required for $5\sigma$ discovery and give results to achieve $2\sigma$ exclusion given the Standard Model case, $\alpha$ = 0, at 1 TeV, 10TeV, and 30TeV at a muon collider.
Speaker: Morgan Cassidy (University of Washington (US)) -
9
Searching for new physics in the Higgs-top coupling at high scales and in $t\overline{t}Z$ production using angular moments
The top-quark Yukawa coupling $y_t$ is the strongest interaction of the Higgs boson in the Standard Model (SM) with $y_t \sim 1$ 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, $t\bar{t}h$. We study new physics effects for the Higgs-top coupling at high scales, using jet substructure techniques. We present the high-luminosity LHC sensitivity to new physics parametrized in the EFT framework and through a general Higgs-top form factor. We also study the $t\bar t Z$ process, where the angular moments for the $Z$-boson can be used as analyzers for the underlying production dynamics. Again working in the EFT framework up to dimension-six, we show the sensitivity to new physics, assuming $3~\text{ab}^{-1}$ of data at the 14 TeV LHC.
Speaker: Roshan Mammen Abraham (Oklahoma State University) -
10
Higgs Boson Production in Association of Three Jets via Gluon Fusion
In this talk, I will discuss finite top and bottom quark mass effects in the computation of scattering cross-sections for the production of Higgs Boson in association of three jets at Hadron Colliders such as the CERN Large Hadron Collider. I will, also, present predictions for the production a CP-violating Higgs.
Speaker: Terrance Figy (Wichita State University)
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6
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12:40
Lunch 3005 Malott
3005 Malott
University of Kansas
Department of Physics & Astronomy University of Kansas Lawrence, KS -
Session 3 2001 Malott Hall
2001 Malott Hall
University of Kansas
Department of Physics & Astronomy University of Kansas Lawrence, KSConvener: Prof. Doug McKay (University of Kansas)-
11
Neutrino Experiment Overview
TBD
Speaker: Timothy Alan Bolton (Kansas State University (US)) -
12
Probing Neutrino Mass Models at Neutrino Telescopes
The detection of ultra-high energy (UHE) neutrinos by the IceCube neutrino telescope has ushered in a new era of neutrino astrophysics. We will discuss how the IceCube data can as well be used as an effective probe of neutrino mass models. In particular, we will show that the mediators of some well-motivated radiative neutrino mass models can give rise to Glashow-like resonance features in the UHE event spectrum that could potentially be observed at IceCube and/or its high-energy upgrade IceCube-Gen2. The same mediators can also give rise to observable non-standard neutrino interactions (NSI), which is currently being probed by the long-baseline neutrino experiments, and we show that the UHE neutrinos provide a complementary probe of NSI. Finally, we will also discuss an interesting possibility of producing such resonances by incoming sterile neutrino components in the case where neutrinos are pseudo-Dirac particles.
Speaker: Bhupal Dev (Washington University in St. Louis) -
13
Neutrino masses and magnetic moments of electron and muon in the Zee Model
In this work, we explore parameter space in the Zee Model to resolve the long-standing tension of the electron and muon anomalous magnetic moment (AMM). We propose two minimal flavor structures that can explain these anomalies while fitting the neutrino oscillation data. To be comprehensive, we examine the constraints from the electric dipole moment (EDM) and find a region of parameter space that gives a sizable contribution to muon EDM while simultaneously giving corrections to muon AMM. The model is consistent with constraints from colliders, electroweak precision data, and lepton flavor violation.
Speaker: Ritu Dcruz (Oklahoma State University) -
14
Muon Mass-Magnetic Moment Conundrum
Recent precise measurement of muon anomalous magnetic moment by the Fermilab experiment reaffirm the Brookhaven measurement and point towards physics beyond the Standard Model. Such a new physics interpretation of muon $g-2$ anomaly typically leads to large corrections to the muon mass. In this work, we study the constraints imposed by these muon mass corrections on the scale of new physics interpretation of muon $g-2$ anomaly.
Speaker: Vishnu Padmanabhan Kovilakam
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11
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16:00
Coffee Break 2001 Malott Hall
2001 Malott Hall
University of Kansas
Department of Physics & Astronomy University of Kansas Lawrence, KS -
Session 4 2001 Malott Hall
2001 Malott Hall
University of Kansas
Department of Physics & Astronomy University of Kansas Lawrence, KSConvener: Dorival Gonçalves (Oklahoma State University)-
15
Electroweak phase transition in the 2HDM: collider and gravitational wave complementarity
The knowledge of the Higgs potential is crucial for understanding the origin of mass and thermal history of our universe. We show how collider measurements and observations of stochastic gravitational wave signals can complement each other to explore the multiform scalar potential in the 2HDM. Accounting for theoretical and current experimental constraints, we analyze the key ingredients in the shape of the Higgs potential triggering the transmutation in phase transition, from the smooth cross-over to the strong first-order phase transition ($\xi_c>1$), focusing on the barrier formation and the upliftment of the true vacuum. In particular, we observe that $\xi_c>1$ regime is favored for lower scalar masses, rendering strong extra motivation for collider searches. We contrast the dominant collider signals at the HL-LHC with observable gravitational wave signals at LISA. We obtain that the HL-LHC will be able to cover a vast range of the $\xi_c>1$ parameter space, with scalar decays to heavy fermions $(H,A,H^\pm\to tt, tb)$ being the most promising smoking gun signature of strong first-order electroweak phase transition in the 2HDM.
Speaker: AJAY Kaladharan -
16
Complex Singlet Benchmarks for Future Collider Scenarios
Introducing simplified models with new particles/symmetries is one of the simplest solutions to the questions unanswered by the Standard Model of particles physics. We explore the phenomenology of adding a complex scalar singlet to the Standard Model without imposing any additional symmetries. This extension is particularly interesting since the model has three scalar mass eigenstates. This allows the production of discalar resonances between two different mass states. Additionally, the model can produce decay chains with several scalar resonances and other unique collider signatures. We study several benchmark scenarios that highlight the importance of various thresholds and display the rich phenomenology of the complex singlet model. We consider constraints such as narrow width, boundedness, perturbative unitarity, Higgs fits, and direct searches.
Speaker: Samuel Lane -
17
3HDM under $S_3$ Symmetry and Flavor Constraints
We investigate the scalar potential with soft breaking terms and flavor part of a general $S_3$-symmetric three-Higgs-doublet model. By assuming that the quarks, leptons and Higgs fields belong to irreducible representation of the permutation group $S_3$ and CP violation, parameter space that can reproduce quark masses, lepton masses, CKM matrix, PMNS matrix is obtained, which also satisfies the potential stability constraints, unitarity constraints, FCNC constraints and EDM constraints.
Speaker: Shiyuan Xu
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15
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1
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Session 5 2001 Malott Hall
2001 Malott Hall
University of Kansas
Department of Physics & Astronomy University of Kansas Lawrence, KSConvener: Terrance Figy (Wichita State University)-
18
Constraining SMEFT operators $\mathcal{O}_{tZ}$ and $\mathcal{O}_{tW}$ via searches in $tZj$ and $t\bar{t}Z$ channels with Machine Learning
We explore the projected sensitivity for Standard Model Effective Field Theory (SMEFT) coefficients $\mathcal{C}_{tZ}$ and $\mathcal{C}_{tW}$ via associated single top production $ pp \to tZj$ and top pair production $pp \to t\bar{t}Z$ channels with machine learning techniques, at the high luminosity LHC (HL-LHC). Implications from new physics modifications in relevant background processes are also included. We identify the subset of observables that are most relevant towards constraining $\mathcal{C}_{tZ}$ and $\mathcal{C}_{tW}$. Differential measurements in $pp \to t\bar{t}Z$ and $pp \to tZj$ channels have only recently begun and are expected to become more accessible at the upcoming runs of the LHC. We show that complementing cross-section measurements with kinematic information can boost the sensitivity for $\mathcal{C}_{tZ}$ and $\mathcal{C}_{tW}$ at the HL-LHC.
Speaker: Rahool Kumar Barman (Oklahoma State University) -
19
Toponium at the LHC
Measurements of the di-leptonic top-antitop events at the LHC unraveled some excesses. We examine the possibility that those excesses can be consequences of non-perturbative enhancement of the production cross section near the t-tbar threshold. While sub-dominant in terms of total rates, so-far neglected toponium effects yield the additional production of di-leptonic systems with small invariant mass and small azimuthal angle separation. This could contribute to the above-mentioned deviations from the Standard Model simulation, which accounts only for perturbative corrections. We propose a method to discover toponium in present and future data, and our results should pave the way to further experimental and phenomenological studies on toponium.
Speaker: Ya-Juan Zheng -
20
NLO Multijet Merging for Higgs Production
The discovery of the Higgs boson in 2012 by ATLAS and CMS Collaborations opens a new era to particle physics, making processes involving Higgs production interesting and essential in many ways. For the first time, we have presented complete results at NLO prediction for electroweak Higgs production merged with dipole shower by unitarized merging algorithm framework in Herwig 7 and compared to NLO plus parton shower (NLOPS) matched calculations. This talk is based on the paper arXiv:2109.03730.
Speaker: Mr Tinghua Chen (Wichita State University) -
21
Probing the Thermal History of our Universe with Collider and Gravitational Wave experiments
TBD
Speaker: Dorival Gonçalves (Oklahoma State University)
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18
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10:30
Coffee Break 2001 Malott Hall
2001 Malott Hall
University of Kansas
Department of Physics & Astronomy University of Kansas Lawrence, KS -
Session 6 2001 Malott Hall
2001 Malott Hall
University of Kansas
Department of Physics & Astronomy University of Kansas Lawrence, KSConvener: Bhupal Dev (Washington University in St. Louis)-
22
Gegenschein signal from an inhomogeneous axion dark matter distribution
A flux of photons (from e.g. supernova remnants) with a frequency equivalent to one-half of the axion mass, can induce the decay of nonrelativistic axion dark matter into two photons. Half of the photons produced in the decays generate a potentially detectable 'gegenschein' radio signal traveling in the opposite direction. We take into account that, in addition to a smooth halo distribution, a fraction of the axionic dark matter might be in the form of compact objects known as axion stars. We discuss how, as a result, the gegenschein signal might be enhanced.
Speaker: Takuya Okawa -
23
Comparison of SUSY spectra generators for natural SUSY and string landscape predictions
Models of natural supersymmetry give rise to a weak scale mweak ∼ mW,Z,h ∼ 100 GeV
without any (implausible) finetuning of independent contributions to the weak scale. These models, which exhibit radiatively driven naturalness (RNS), are expected to arise from statistical analysis of the string landscape wherein large soft terms are favored, but subject to a not-too-large value of the derived weak scale in each pocket universe of the greater multiverse. The string landscape picture then predicts, using the Isajet SUSY spectra generator Isasugra, a statistical peak at mh ∼ 125 GeV with sparticles generally beyond current LHC search limits. In this paper, we investigate how well these conclusions hold up using other popular spectra generators: SOFTSUSY, SPHENO and SUSPECT (SSS). We built a computer code DEW4SLHA which operates on SUSY Les Houches Accord files to calculate the associated electroweak naturalness measure ∆EW. The SSS generators tend to yield a Higgs mass peak ∼ 125 − 127 GeV with a superparticle mass spectra rather similar to that generated by Isasugra. In an Appendix, we include loop corrections to ∆EW in a more standard notation.Speaker: Dakotah Martinez (University of Oklahoma) -
24
Detectable Gravitational Wave from Classically Scale Invariant theories and asymmetry scale
I would be discussing on the exciting possibility of detecting signals coming from classically scale invariant models. Along with that I would be commenting on plausible Dark Matter candidates in such models as well. And at the end I will comment also on the possibility on constraining the scale of particular Leptogenesis model.
Speaker: Arnab Dasgupta (PITT-PACC)
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22
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25
Concluding Remarks 2001 Malott Hall
2001 Malott Hall
University of Kansas
Department of Physics & Astronomy University of Kansas Lawrence, KS
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