Bulletin of the American Physical Society
88th Annual Meeting of the Southeastern Section of the APS
Volume 66, Number 16
Thursday–Saturday, November 18–20, 2021; University Center Club, Florida State University, Tallahassee, Florida
Session O03: Flavor Physics and Precision Tests of the Standard Model |
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Chair: Romulus Godang, University of South Alabama Room: Stadium |
Friday, November 19, 2021 4:30PM - 5:00PM |
O03.00001: An Introduction to the Mu2e Experiment and Preparation Status in the Year 2021 Invited Speaker: Charles Jenkins The Mu2e Experiment will search for Charged Lepton Flavor Violation (CLFV) in the process of a coherent neutrinoless mu- N -\textgreater e- N transition. This process is allowed under the Standard Model in the presence of neutrino mixing; albeit, at unobservable rates (branching ratio below 10$^{-50})$. The sensitivity of the Mu2e experiment is a factor of 10$^{4}$ improvement over the current limit. This search both compliments and extends current searches for muon to electron$+$gamma at MEG and new physics searches at the LHC. Another interesting process that~Mu2e~will search for is the neutrionless conversion of stopped negative muons into positrons: mu- N -\textgreater e$+$ N'.~ This process violates both lepton flavor and lepton number (LNV) and would provide proof that neutrinos are Majorana particles. A description of the Mu2e Experiment and an update on this experiment's preparation status in the year 2021 will be presented. [Preview Abstract] |
Friday, November 19, 2021 5:00PM - 5:12PM |
O03.00002: Measuring Neutron Beta Decay Correlations with the Nab Experiment Joshua Hamblen The Nab experiment aims to make precise measurements of unpolarized free neutron beta decay, specifically the electron-neutrino correlation parameter, a, to a precision of $\delta a/a \leq 10^{-3}$ and the Fierz interference term, b, to $\delta b \approx 3 \times 10^{-3}$. The results will test the unitarity of the CKM matrix as well as offer a glimpse into possible physics beyond the Standard Model. The experiment features a long asymmetric electromagnetic spectrometer that directs the decay products to silicon pixel detectors that will measure the electron energy and proton momentum. These are used to reconstruct the electron-neutrino angle to determine 'a' and the electron energy spectrum, which is used to determine 'b'. The Nab apparatus is currently being commissioned at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source at ORNL. I will present an overview of the experiment as well as a status update. [Preview Abstract] |
Friday, November 19, 2021 5:12PM - 5:24PM |
O03.00003: Searches for New Physics Contributions in the Form of a Charged Higgs Boson Romulus Godang Using a full BABAR data sample of 426/fb, we present the measurements of the ratio R(D(*)) $=$ BR (B to D(*) tau nu) / BR (B to D(*) ell nu) where ell is either electron or muon. We measure R(D) $=$ 0.440 $\backslash $pm 0.058 $\backslash $pm 0.042 and R(D*) $=$ 0.332 $\backslash $pm 0.024 $\backslash $pm 0.018. These ratios exceed the Standard Model predictions by 2.0 sigma and 2.7 sigma, respectively. The results disagree with the Standard Model predictions at the level of 3.4 sigma. These ratios are sensitive to new physics contributions in the form of a charged Higgs boson. [Preview Abstract] |
Friday, November 19, 2021 5:24PM - 5:36PM |
O03.00004: Probing the B-Meson Anomalies Using ttbar+Z' Processes and Machine Learning Elijah Sheridan We perform a feasibility study to search for $Z'$ particles by probing their production in association with boosted top quarks at the LHC. In particular, we focus on the $Z' \to b\overline{b}$ decay mode and a semileptonic, semihadronic final state. Motivated by the lepton non-universality suggested by recent experimental findings in $b$ physics and muon $g - 2$ studies, we focus on a $Z'$ which couples strongest to the third generation fermions, substantiating our selected signal process. Assuming proton-proton collisions at $\sqrt{s} = 13$ TeV, we present the total $pp \to t\overline{t}Z'$ production cross sections and relevant kinematic distributions as a function of $m_{Z'}$ and the coupling product $g_{t\overline{t}Z'}g_{b\overline{b}Z'}$. We employ contemporary machine learning binary classification models---in particular, decision trees with gradient boosting---to discriminate between our signal and Standard Model backgrounds, resulting in increased discriminating power and a $5\sigma$ discovery reach that exceeds existing $m_{Z'}$ limits. [Preview Abstract] |
Friday, November 19, 2021 5:36PM - 5:48PM |
O03.00005: ~~Measurement of the Xi\textunderscore c$+$ Lifetime with Belle II Simulations Paul Gebeline, Jake Bennett We present a measurement of the lifetime of the Xi\textunderscore c baryon using simulated data from the Belle II experiment, based at the SuperKEKB electron-positron collider in Tsukuba, Japan. Multiple Xi\textunderscore c decay modes are investigated to explore the feasibility of lifetime measurements of this type at Belle II. After verifying the results on simulation, this study will be applied to Belle II data. [Preview Abstract] |
Friday, November 19, 2021 5:48PM - 6:00PM |
O03.00006: A novel efficient four-dimensional foam and its application in computational particle modeling Elia Dmitrieff A problem of finding space partitioning into cells of equal volume with the least area of surface between them was established by Lord Kelvin\footnote{Lord Kelvin (Sir William Thomson). Phil. Mag. \textbf{24}, 151 (1887)} in 1887 in a framework of the ether theory. The problem still has the proven\footnote{Hales, Thomas C. Discrete Comput. Geom. \textbf{25}, 1 (2001)} solution just for 2D space, that is a regular hexagon tiling. Original Kelvin conjecture in 3D, that is the bitruncated cubic honeycomb, got the counterexample\footnote{Weaire D., Phelan R. Phil. Mag. Lett. \textbf{69}, 2 (1994).} in 1993. We propose the candidate solution for the Kelvin problem in 4D that appears more simple and more efficient than the best known 3D solution. It is a regular foam of uniform 26-cell polytopes. Its properties allow us to consider it as a prospective basic spacetime computational model possessing CPT symmetry. Some anti-structure defects of this tessellation could be mapped to known SM fundamental particles manifesting correct quantum numbers\footnote{Dmitrieff E.G. Proc. 21th Workshop “What comes beyond the SMs”(2018)}. We discuss arguments in favor of generalizing the original problem to be any-dimensional, and existing of the only solution of it, namely one we proposed. [Preview Abstract] |
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