Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session X08: Beyond the Standard Model Physics IIRecordings Available
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Sponsoring Units: DPF Chair: Yang Ma, University of Pittsburgh Room: Juilliard |
Tuesday, April 12, 2022 10:45AM - 10:57AM |
X08.00001: Reinterpretation of CMS search for LLPs using endcap muon detectors Christina Wang, Andrea Mitridate, Michele Papucci We present a recast and sensitivity projection in different benchmark models of a recent result from CMS (https://arxiv.org/abs/2107.04838) that uses the endcap muon detectors as sampling calorimeter to identify displaced showers produced by decays of long-lived particles (LLPs). The exceptional shielding provided by the steel return-yoke interleaved between the CMS muon detector stations drastically reduces the SM background that limits other existing searches. We present a new dedicated Delphes module for fast detector response simulation of the muon detector showers and the recast of the novel CMS search to low mas LLP models using the new Delphes module. We also discuss the complementarity of the CMS search to dedicated LLP proposed and existing experiments. |
Tuesday, April 12, 2022 10:57AM - 11:09AM |
X08.00002: Search for neutral long-lived particles decaying into displaced jets in the ATLAS calorimeter Mason Proffitt New long-lived particles are a feature of many extensions to the Standard Model and may elude searches for promptly decaying particles. An analysis of data collected in pp collisions at √s = 13 TeV with the ATLAS detector at the Large Hadron Collider is described, focusing on identifying signatures of jets produced by long-lived particles decaying to Standard Model fermions within the ATLAS calorimeter system. The analysis considers benchmark hidden sector models of neutral long-lived scalars with masses between 5 GeV and 475 GeV produced by decays of heavy mediators with masses between 60 GeV and 1000 GeV. Models of stealth supersymmetry, Higgs-portal baryogenesis, and dark photons are also considered. The results of this analysis are presented using the full Run 2 (2015-2018) data set, corresponding to an integrated luminosity of 139 fb−1. |
Tuesday, April 12, 2022 11:09AM - 11:21AM |
X08.00003: Dark Matter and Beyond the Standard Model Searches with theMajorana Demonstrator Jose M Lopez, Clint Wiseman, In Wook Kim The Majorana Demonstrator experiment is an array of p-type, point-contact (PPC) Ge detectors searching for neutrinoless double-beta decay in Ge-76 operating in a low background shield at the Sanford Underground Research Facility. Additional searches beyond the Standard Model are enabled by the Majorana Demonstrator at low and high energy. The low energy program has pursued several exotic keV-scale physics searches in the 1-100 keV range, including lightly ionizing particles, bosonic dark matter (axionlike and dark photon), and solar axions. Currently, data cleaning analysis techniques have been finalized and the full low energy dataset has been unblinded, providing 38.4 kg-yr of exposure from enriched Ge-76 ultra-low background detectors. The finalized data cleaning and substantially larger exposure allows competitive improvements and new results of physics beyond the Standard Model. This talk presents improved limits on the bosonic dark matter, solar axion, and other physics topics such as electron decay. In addition, new searches for physics beyond the Standard Model are reported, including the first experimental limits on detection of fermionic dark matter and leading limits on spontaneous radiation from wavefunction collapse for certain models. |
Tuesday, April 12, 2022 11:21AM - 11:33AM |
X08.00004: MicroBooNE's Beyond the Standard Model and Astroparticle Capabilities and Results Ivan Lepetic MicroBooNE is an 85-ton active mass liquid argon time projection chamber (LArTPC) at Fermilab. It has excellent calorimetric, spatial and energy resolution and is exposed to two neutrino beamlines, which make it a powerful detector not just for neutrino physics, but also for Beyond the Standard Model (BSM) and astroparticle physics. The experiment has competitive sensitivity to heavy neutral leptons possibly present in the leptonic decay modes of kaons, and also to scalar bosons that could be produced in kaon decays in association with pions. In addition, MicroBooNE serves as a platform for prototyping searches for rare events in the future Deep Underground Neutrino Experiment (DUNE). This talk will explore the capabilities of LArTPCs for BSM physics and astroparticle physics and highlight some recent results from MicroBooNE. |
Tuesday, April 12, 2022 11:33AM - 11:45AM |
X08.00005: Constraints on the Yukawa couplings of a light scalar mixing with the Higgs from decays to pseudoscalars Patrick Blackstone, Jaume Tarrús Castellà, Emilie Passemar
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Tuesday, April 12, 2022 11:45AM - 11:57AM |
X08.00006: Progress Towards a Search for the Higgs Portal Scalar at ICARUS Gray Putnam The ICARUS experiment consists of a Liquid Argon Time Projection Chamber (LArTPC) detector at Fermilab in operation as a part of the Short Baseline Neutrino (SBN) Program. The ICARUS detector sits at the intersection of two neutrino beams: the Booster Neutrino Beam (BNB), which will enable SBN's primary eV-scale sterile neutrino search, and the higher-energy Neutrinos at the Main Injector beam (NuMI). The large intensities of these beams necessary for neutrino physics also enable searches for many Beyond Standard Model Physics models. One such model is the Higgs Portal: a scalar inherits couplings to Standard Model particles through a small mixing with the SM Higgs. This scalar could in principle comprise part of a larger dark sector. At SBN, the scalar would be produced primarily in Kaon decays at the NuMI beam, from which a fraction of them would then travel to the ICARUS detector and decay. A search for the di-muon decay of this scalar in ICARUS will be able to set new limits on this model in the couple hundreds of MeV mass range. I will discuss progress towards an event selection for the di-muon decay of the Higgs Portal Scalar, including methods for rejecting the neutrino background. I will also show a first look at data in the ICARUS detector related to this analysis. |
Tuesday, April 12, 2022 11:57AM - 12:09PM |
X08.00007: Search for a low mass dark photon radiated from a muon Yao Yao A search for dark photons with mass below 1 MeV, radiated from a final state muon, is presented using proton-proton collision data collected with the CMS detector in 2018, 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 virtual pair-production. Its small kinetic mixing with the Standard Model photon allows a dark photon to penetrate the CMS electromagnetic calorimeter and deposit energy in the hadronic calorimeter. The search is performed by looking for events whose final state is composed of two muons and a photon-like shower in hadronic Calorimeter. Preliminary studies about distinguishing the signal from the standard model backgrounds will be presented. |
Tuesday, April 12, 2022 12:09PM - 12:21PM |
X08.00008: Search for Dark Photons Decaying to Lepton Jets: Prospects for CMS with HL-LHC Peter J Dong, Andy Tang Production of dark photons with GeV-scale mass is predicted from models of supersymmetry and coupling of Higgs bosons to the dark sector. A distinctive signature is the presence of highly collimated jets of oppositely charged muons or electrons. We report the results of a simulation study of the CMS detector for p-p collisions at 14 TeV with average pile-up (interactions per bunch crossing) of 200. The efficiencies for detection of promptly produced dark photons and major Standard Model backgrounds are determined, and an event selection is developed that enhances the sensitivity of the search. The expected upper limit on the cross section is estimated and interpreted in terms of the kinetic mixing parameter. |
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