Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session Z10: Beyond the Standard Model Physics IIIRecordings Available
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Sponsoring Units: DPF Chair: Gordon Watts, University of Washington Room: Lyceum |
Tuesday, April 12, 2022 3:45PM - 3:57PM |
Z10.00001: Search for magnetic monopoles produced via the Schwinger mechanism in LHC Pb-Pb collisions Aditya Upreti Schwinger predicted the production of an electron-positron pair via the decay of strong electric fields. If magnetic monopoles (MMs) exist, they would be produced in sufficiently strong magnetic fields via the electromagnetic dual of the Schwinger mechanism. Unlike the previously studied MM production processes, the rate can be calculated by the semi-classical methods without using the perturbative calculation. The finite MM size and monopole-photon coupling increase the MM production rate. The 2018 Pb-Pb collisions at the LHC produced the strongest magnetic fields in the known Universe. The MoEDAL experiment searched for MMs in the LHC Run-2, where, its MM trapping detectors were exposed to 0.235 $nb^{-1}$ of Pb-Pb collisions with 5.02 TeV center-of-mass energy per collision. MMs with Dirac charges 1$g_D$ $\leq$ $g$ $\leq$ 3$g_D$ and masses up to 75 GeV/c$^2$ were excluded by the analysis at the 95\% confidence level. This provides the first lower mass limit for finite-size magnetic monopoles from a collider search and significantly extends previous mass bounds. This talk would describe the results from this study and provide an outlook of future searches that would expand the sensitivity of MoEDAL detectors to higher magnetic charges. |
Tuesday, April 12, 2022 3:57PM - 4:09PM |
Z10.00002: Search for the pair production of vector-like quarks in the Wq+X final state with the full Run 2 ATLAS dataset Evan R Van De Wall Vector-like quarks (VLQ) are predicted in many extensions to the Standard Model (SM) as their vector-like nature allows them to extend the SM while still being compatible with electroweak sector measurements. Pair production of VLQ provides a model-independent method of searching due to the QCD production of the particles. While most searches have focused on VLQs that decay to an SM boson and a third-generation quark, decays to light quarks have been largely overlooked. This talk presents the expected results of a search for pair production of vector-like down quarks that decay into a leptonically decaying SM W boson and a light quark, with the other VLQ decaying to a hadronically decay boson and a light quark. The analysis uses boosted boson identification and data-driven correction of the dominant W+jets background prediction to improve sensitivity. Further, this analysis extends the sensitivity of previous analysis done in Run 1 by increasing the collision energy and the statistics by including the full Run 2 ATLAS dataset with an integrated luminosity of 139 fb-1. |
Tuesday, April 12, 2022 4:09PM - 4:21PM |
Z10.00003: A Multiple Final State Search for Pair-Produced Bottom-Type Vector-Like Quarks in CMS Run 2 Data Noah Paladino We describe the extension of previous searches for the production of a pair of bottom-type vector-like quarks (VLQs) to include semileptonic channels and an increased sensitivity to fully hadronic channels in data gathered by the CMS detector during the 13 TeV runs in 2016, 2017, and 2018 of the LHC at CERN. We study hypothesized events where each VLQ decays to a bottom quark and a Higgs/Z boson or to a top quark and a W boson. We consider the cases where each boson decays into two quarks, which are typically resolved as two jets but can be resolved as one jet when the boson has a high transverse momentum. In the case of the VLQ decay to tW, we consider events where the top quark is resolved as either one, two, or three jets. For decays of the VLQ pair to bHbZ and bZbZ we consider decays of the Z boson to two leptons of the same flavor and opposite charge. Using a χ2 metric based on the reconstructed masses of the Higgs/Z/W bosons and top quark, and on jet-level b-quark tagging, significantly reduces background from Standard Model processes. We present the updated exclusion limits set from the combination of the fully-hadronic and dileptonic analyses run over 137 fb-1 of integrated luminosity data collected by the CMS detector during Run II. |
Tuesday, April 12, 2022 4:21PM - 4:33PM |
Z10.00004: Search for a Doubly Charged Higgs Boson Decaying to Muons or Electrons: Prospects for CMS with HL-LHC Peter J Dong, Zoie Sloneker A variety of exotic models predict a doubly charged Higgs-like particle that can be pair-produced in hadronic interactions via a Drell-Yan-like mechanism. The H++ and H-- have TeV-scale mass and can each decay to a pair of like-sign leptons (muons or electrons in this study), providing a distinctive event signature. 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 the signal and major Standard Model backgrounds are determined and an event selection is developed that enhances the sensitivity of the search. We present an estimate of the expected lower limit on the mass of the doubly charged Higgs. |
Tuesday, April 12, 2022 4:33PM - 4:45PM |
Z10.00005: Third Quantization of the Electromagnetic Field James D Franson Each mode j of the electromagnetic field is mathematically equivalent to a harmonic oscillator containing a single hypothetical particle whose excited states correspond to the presence of photons. In quantum optics, the so-called quadrature operator is defined by xj=(aj+aj†)/√2, where aj and aj† are the usual raising and lowering operators. This allows the definition of a wave function ψj(xj) for the hypothetical particle in quadrature space. Here we consider an approach in which the wave function is further quantized to produce a field operator. Since the electromagnetic field is already second-quantized, this corresponds to an additional or third quantization. This approach was originally introduced as a useful computational technique in quantum optics, but it also allows an interesting generalization of quantum optics and quantum electrodynamics that is analogous to symmetry breaking in elementary particle theory. The generalized theory is based on a single parameter γ that is analogous to a mixing angle, such as the Cabibbo angle or the Weinberg angle. The predictions of the generalized theory can be tested using a proposed photon scattering experiment. The preliminary results of such an experiment will be described. |
Tuesday, April 12, 2022 4:45PM - 4:57PM |
Z10.00006: Electron Mass and State Energy Levels Resulting from Photon-Photon Interaction DT Froedge This is a new perspective on fields and forces based on the Feynman action path view of quantum mechanics. Although the probable paths are well known and have real effects, overlooked has been the probability that the particles are actually on these paths and have effects. Presented here is the showing that the effect of these photons is responsible for both electric and gravitational energy potentials. |
Tuesday, April 12, 2022 4:57PM - 5:09PM |
Z10.00007: Mechanisms for Radion Stabilization with Bulk Fields Robert D Clemenson The Randall-Sundrum model has been a great source of interest to theorists and phenomenologists for over two decades, both for its novel solution to the hierarchy problem, and its phenomenological consequences. The modulus field associated with the warped extra dimension of this model requires stabilization. A number of mechanisms have been considered in this effort; from the classic approach of Goldberger and Wise (hep-ph/9907447), to Casimir forces due to bulk matter & gauge fields (hep-th/0212227), to a TeV confining bulk gauge field (hep-th/1910.07546). In practice, each of these mechanisms will contribute simultaneously. |
Tuesday, April 12, 2022 5:09PM - 5:21PM |
Z10.00008: Updated Limits on Leptophilic Effective WIMPS Jeffrey P Hutchinson We analyze the limits from the ATLAS 139 fb-1 search for charginos and sleptons with two leptons and missing energy in the context of minimal extensions to the standard model with thermal relic dark matter called Leptophilic Effective WIMPs. These models contain a singlet dark matter particle and a lepton “partners” with renormalizable cubic couplings between dark matter, the lepton partners, and leptons. Within this framework, we consider four models where the dark matter is a real scalar boson, complex scalar boson, Majorana fermion, or Dirac fermion. |
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