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 M10: Collider Physics III |
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Sponsoring Units: DPF Chair: Todd Adams, Florida State University Room: Marquette I - 2nd Floor |
Monday, April 17, 2023 10:45AM - 10:57AM |
M10.00001: A new frontier for Magnetic Monopoles searches - LHC Pb-Pb collisions via Schwinger Mechanism Aditya Upreti The Schwinger mechanism predicts the production of an electron-positron pair through the decay of an extremely strong electric field. Magnetic Monopoles (MMs) - if they exist - would be produced in sufficiently strong magnetic fields via the electromagnetic dual of this process. The 2018 lead ion collisions at the LHC produced the strongest magnetic fields in the known Universe. The MoEDAL detectors – Magnetic Monopole trappers (MMTs) and Nuclear Track Detectors (NTDs) were exposed to 0.235 nb-1 of Pb-Pb collisions with 5.02 TeV center-of-mass energy per collision. The analysis excluded the presence of MMs with Dirac charges 1gD ≤ g ≤ 3gD and masses up to 75 GeV/c2 at 95% confidence level. Uniquely, the MM production rate can be calculated by semi-classical methods without the use of perturbative calculation. This search, thus, provides the first reliable lower mass bound for finite-size magnetic monopoles from a collider search while significantly extending previous bounds. Additionally, the CMS Run-1 Beryllium beam pipe is currently being analyzed for Schwinger-produced Monopoles. This talk would describe the results thus far and the ongoing searches to expand the sensitivity of MoEDAL detectors to higher magnetic charges. |
Monday, April 17, 2023 10:57AM - 11:09AM |
M10.00002: Muon Collider Sensitivity to Anomalous Quartic Gauge Couplings CONNOR H WAITS, Brad Abbott, Aram Apyan, Bianca Azartash-Namin, Veena Balakrishnan, Jeffrey W Berryhill, Shih-Chieh Hsu, Sergo Jindariani, Mayuri Kawale, Elham E Khoda, Ryan Parson, Alexander Schuy, Michael G Strauss, John Stupak A muon collider has one primary advantage over the Large Hadron Collider (LHC) regarding sensitivity to anomalous quartic gauge couplings (aQGCs); it effectively serves as a gauge boson collider due to collinear divergences which serves to increase the rate of these rare interactions. We study the sensitivity of a muon collider to dimension-8 operators affecting the WWZγ, WWZZ, and WWγγ vertices. The μ+ μ- W+ W- final state in the vector boson scattering topology is analyzed and expected limits on the energy of new physics are set for 6, 10, and 30 TeV center of mass colliding energies. Expected limits set at all center of mass points are stronger than corresponding limits observed at the LHC by the CMS collaboration at 13 TeV. |
Monday, April 17, 2023 11:09AM - 11:21AM |
M10.00003: Pions and Kaons May be Vector Particles with Spin 0 Walton A Perkins Theoretically, there is a niche for vector particles to have spin zero [1]. Evidence that pions and kaons carry directional information was observed in many experiments during the 1950's and 1960's. These results can be explained if the pion and kaon are a very simple type of vector particle with spin zero. For the neutral pion to be a vector particle and decay into two photons, the two photons must be in a vector state that is asymmetric under the interchange of the two photons. This is possible if the photon is a composite particle. It has been shown [2] that most properties of a composite photon are the same or very similar to those of an elementary photon. We will discuss two 1950's type experiments that can determine if the pion is a vector particle. |
Monday, April 17, 2023 11:21AM - 11:33AM |
M10.00004: Cross section measurement for the production of ZZ → llvv with the ATLAS detector Chuanshun Wei This talk presents a measurement of ZZ production with the ATLAS detector at the Large Hadron Collider. The measurement is carried out focusing on the final state with one Z boson decaying to two charged leptons and the other Z boson decaying to two neutrinos, using data collected during the Run-2 period in pp collisions at √s = 13 TeV, corresponding to an integrated luminosity of 139 fb−1. The inclusive and differential cross-sections for the production of the ZZ → llvv channel are measured. A multivariable analysis is performed to optimize the background rejection for the measurement. |
Monday, April 17, 2023 11:33AM - 11:45AM |
M10.00005: Measurement of the production of a W boson in association with a charmed hadron in pp collisions at √s = 13 TeV with the ATLAS detector Gregory J Ottino The associated production of a W boson with a single charm quark is studied using 140 fb−1 of pp collision data at √s = 13 TeV collected with the ATLAS detector at the Large Hadron Collider. The charm quark is tagged by the presence of a charmed hadron, reconstructed with a secondary vertex fit, and the W boson is reconstructed with the decay to either an electron or a muon and missing transverse energy present in the event. The charm mesons reconstructed are D+ → K−π+π+ and D+∗ → D0π+ → (K−π+)π+ (including the charge conjugate decays) in the fiducial regions where pT (e, μ) > 30 GeV, |η(e, μ)| < 2.5, pT (D+(∗)) > 8 GeV, and |η(D+(∗))| < 2.2. The integrated and normalized differential cross-sections as a function of the pseudorapidity of the lepton from the W boson decay and of the transverse momentum of the charm hadron are extracted from the data using a profiled likelihood fit. These results are compared to the predictions of next-to-leading-order quantum chromodynamics calculations obtained using up-to-date parton distribution function parameterizations. Additionally, the cross-section ratio of charm to anti-charm production cross-sections is studied to probe the s– ¯s quark asymmetry. This analysis gives insight into parton distribution functions and whether an asymmetric s- ¯s sea, in the Bjorken-x region x ∼ 0.1, is supported by the result. |
Monday, April 17, 2023 11:45AM - 11:57AM |
M10.00006: Physics Potential of a Muon-Ion Collider at the TeV Scale Osvaldo Miguel Colin, Darin E Acosta, Wei Li, Yijie Wang, Prathik Boyella The development of muon accelerator and storage ring technology at the TeV scale provides enormous scientific potential not only for a mu+mu- collider, but also for deep inelastic scattering in a completely new regime when a TeV muon beam is brought into collision with a high-energy hadron beam. For example, if the approved Electron-Ion Collider at BNL were eventually upgraded with a TeV muon beam replacing its low energy electron ring, a $Q^2$ reach of up to $10^6$ GeV$^2$ is accessible and a parton momentum fraction $x$ down to $1.0 imes 10^{-5}$ can be probed. We argue that such a Muon-Ion collider provides a natural first science case for the development of high-energy muon accelerator technology. In this talk we summarize the science case for a muon-ion collider, which includes precision structure function, QCD, and electroweak measurements, standard model particle production and coupling measurements including the Higgs boson, and searches for beyond standard model physics in second-generation fermion couplings such as Z-prime and leptoquark production. |
Monday, April 17, 2023 11:57AM - 12:09PM |
M10.00007: Search for dark photons decaying to lepton jets: Prospects for CMS Run III Jesus Fileto Production of dark photons with GeV-scale mass is predicted in many dark sector models. A distinctive signature is the presence of two pairs of oppositely charged leptons (muons only, in this study) where the angle between the leptons in a pair is small but detectable. We report the results of preliminary studies for the sensitivity of the CMS experiment during Run III. The efficiencies for detection of promptly produced dark photons and major Standard Model backgrounds are determined. 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 several production mechanisms. |
Monday, April 17, 2023 12:09PM - 12:21PM |
M10.00008: Multi-track Displaced Vertices at B-Factories Albany Blackburn, Brian Shuve We propose a program of inclusive, multi-track displaced vertex searches at B-factories, which are expected to be low background and sensitive to a wide variety of hidden sector models. Multi-particle hidden sectors often include long-lived particles (LLPs) which result from approximate symmetries. We use an effective field theory framework to classify the decays of GeV-scale LLPs, finding that, generically, LLPs can decay to more than two charged particles. This allows us to investigate the sensitivity of searches for different numbers of displaced vertices per event and track requirements per displaced vertex for several LLP-production modes, including dark photons and dark Higgs bosons. We show that our proposed program of inclusive searches offers sensitivity to a large range of hidden sector models that are otherwise unconstrained by current or planned searches. |
Monday, April 17, 2023 12:21PM - 12:33PM |
M10.00009: Probing Heavy Neutral Leptons at Muon Collider Peiran Li, Zhen Liu, Kunfeng Lyu The smallness of neutrino mass is a puzzle of particle physics, and a broad class of solutions can be best tested by seeking the partners of SM light neutrinos. These neutrino partners, dubbed as heavy neutral leptons (HNL), mix with SM neutrinos. The future high-energy muon colliders, which combine high energy and low background, could play a critical role in our searches for HNL. |
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