Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session EE01: V: Beyond Standard Model Physics |
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Sponsoring Units: DPF Chair: Tanvi Wamorkar, Argonne National Laboratory Room: Virtual Room 1 |
Monday, April 24, 2023 1:00PM - 1:12PM |
EE01.00001: Searches for new resonant phenomena in final states with two top quarks using the ATLAS detector Alex J Schuy, Elham E Khoda, Shih-Chieh Hsu Many theories beyond the Standard Model predict new phenomena, such as Z′ and vector-like quarks, in final states containing 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. This presentation will summarize the recent results of top-antitop resonance searches where the top quarks decay into a lepton and jets using the full Run-2 (139 fb-1) proton-proton collision data collected at a center-of-mass energy of √s=13 TeV with the ATLAS detector. This talk will also highlight the latest improvements gained by using a new strategy to remove the overlap between an electron and a jet. The results are interpreted using models with a heavy Z’ boson of narrow width, Kaluza-Klein gluon, and Kaluza-Klein Graviton with a large width. |
Monday, April 24, 2023 1:12PM - 1:24PM |
EE01.00002: Unification of forces in Spin(11,1) Andrew J. S. Hamilton, Tyler McMaken Spin(10), the covering group of SO(10), is a well-known promising grand unified group. Each of the 25 = 32 spinors in a fermion multiplet of Spin(10) is actually a chiral (massless) Weyl spinor, with 2 complex components, so each fermion multiplet contains 26 = 64 complex components. Weyl spinors transform under the Lorentz group Spin(3,1). It is natural to ask whether Spin(10) and Spin(3,1) might combine into a common spin group, which given that the spinor representation must have 64 components, and there must be a timelike dimension, must be the group Spin(11,1) of rotations in 11+1 spacetime dimensions. The proposed unification satisfies the Coleman-Mandula theorem, because the standard-model and Dirac algebras prove to be commuting subalgebras of the Spin(11,1) Clifford algebra. There is a unique minimal symmetry-breaking chain from Spin(11,1) to the standard model, and a unique associated minimal scalar Higgs sector that happens to match the vector gauge sector, a 66-component field in the adjoint representation. The Spin(11,1) model is highly predictive, and can and should be subjected to the battery of tests applied to other beyond-standard-model models. |
Monday, April 24, 2023 1:24PM - 1:36PM |
EE01.00003: Open source event generation for BSM scenarios Julia Y Book, Carlos A Arguelles, Leander Fischer Heavy Neutral Leptons (HNLs) are sterile neutrinos posited as an explanation for light neutrino masses. IceCube is uniquely capable of searching for an HNL in the hundreds of MeV to single GeV range by looking for atmospheric tau neutrinos upscattering to HNLs in the detector. The HNLs produced in IceCube would decay quickly, leading to Cherenkov radiation in both production and decay separated by a few meters, producing a “double cascade” signature in the detector.A simulation based on the most up-to-date calculations of HNL decay modes and cross-sections, is required to understand the hundreds of MeV to single GeV parameter space for an HNL search. This talk presents the capabilities of a new HNL simulation, compatible with the open-source MC generator LeptonInjector and useful for simulating a wide range of HNL scenarios.
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Monday, April 24, 2023 1:36PM - 1:48PM |
EE01.00004: Measurement of $t\bar{t}t\bar{t}$ Production Cross Section and Search for New Physics using the Multilepton Final State in Proton-Proton Collisions at $\sqrt{s}$= 13 TeV with the ATLAS Detector Meng-Ju Tsai
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Monday, April 24, 2023 1:48PM - 2:00PM |
EE01.00005: Exploring Heavy Neutral Leptons with Transition Magnetic Moments at Neutrino Experiments Nicholas W Kamp Heavy neutral leptons (HNLs) are additional electroweak-singlet fermions with masses significantly above the mass scale of the Standard Model neutrinos. They show up frequently in extensions of the Standard Model, including the seesaw mechanism—an elegant solution to the small observed masses of SM neutrinos. HNLs with masses in the MeV to GeV regime are the subject of many current and planned experimental searches. In this talk, we focus on HNLs with a transition magnetic moment coupling to active neutrinos, hereafter referred to as "neutrissimos". In this talk, we explore an explanation of the $4.8sigma$ MiniBooNE anomaly based on neutrissimo decay to a single photon. Specifically, we evaluate the consistency of such a model with the energy and angular distributions of the MiniBooNE excess. We also derive world-leading constraints on neutrissimos using MINERvA elastic scattering data. The implications of this result with regard to the neutrissimo-based explanation of the MiniBooNE anomaly are discussed. Finally, we examine the sensitivity of upcoming neutrino experiments to neutrissimos, with a particular emphasis on the Coherent CAPTAIN-Mills (CCM) experiment at the Los Alamos Neutron Science Center (LANSCE). CCM uses a light-based liquid argon detector to search for the interactions of neutrinos and potential dark sector particles produced when 800 MeV protons from the LANSCE accelerator collide with the tungsten target at the Lujan facility. Neutrissimos can also be produced in large abundance in such an environment—thus, CCM will be able to set world-leading constraints on neutrissimos using data collected from its ongoing three-year run. |
Monday, April 24, 2023 2:00PM - 2:12PM |
EE01.00006: Search for Dark Matter produced in association with a dark Higgs boson decaying to two b-quarks using full Run-2 datasets recorded with the ATLAS detector Qimin Jiang A hypothetical dark Higgs boson was proposed in a dark matter (DM) model to explain the origin of mass in the dark sector as well as to open up a new annihilation channel relaxing the DM relic density constraint from cosmological observation. The search focusing on Majorana DM produced with a low mass dark Higgs boson decaying to two b quarks is performed using the 139 fb-1 of proton-proton collision data collected with ATLAS detector at √s =13 TeV. |
Monday, April 24, 2023 2:12PM - 2:24PM |
EE01.00007: Investigating the Decay of Long-Lived Particles in Hidden Valley Models with CMS Samantha Contreras This project aims to complete a feasibility study of the use of muon detector shower objects combined with displaced tracks for the detection of Hidden Valley dark showers. To do this, an algorithm needs to be designed to define the muon detector shower and the displaced track (dark shower object). The Hidden Valley dark shower model simulation samples will be used to measure detection efficiency to obtain a rough estimation of search sensitivity. The simulated samples of LLPs with different lifetimes are studied by analyzing decay particle showers in the Cathode Strip Chamber (CSC), the Drift Tube (DT), and the Tracker in the Compact Muon Solenoid (CMS). |
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