Bulletin of the American Physical Society
84th Annual Meeting of the APS Southeastern Section
Volume 62, Number 13
Thursday–Saturday, November 16–18, 2017; Milledgeville, Georgia
Session F2: Particle Physics II |
Hide Abstracts |
Chair: Dr. Romulus Godang, University of South Alabama Room: MSU Building University Banquet Room B |
Friday, November 17, 2017 11:00AM - 11:12AM |
F2.00001: Higher-order corrections for t gamma production with anomalous couplings Matthew Forslund, Nikolaos Kidonakis We present calculations of higher-order soft-gluon corrections for t gamma production with anomalous t-q-gamma couplings. We include NLO and NNLO soft-gluon corrections, and present results for the total cross sections at various LHC energies. We provide NLO and NNLO K-factors that show the importance of these corrections compared to leading-order results. [Preview Abstract] |
Friday, November 17, 2017 11:12AM - 11:24AM |
F2.00002: A High Efficiency Cosmic Ray Veto Detector for the Mu2e Experiment Charles Jenkins The Mu2e Experiment, at the Fermi National Accelerator Laboratory, will search for the coherent, neutrinoless conversion of stopped muons into electrons, a charged lepton flavor-changing process highly suppressed and hence undetectable in the Standard Model. Many scenarios for physics beyond the Standard Model predict small but observable rates. The sensitivity of this experiment is a factor of 10$^{\mathrm{4}}$ improvement over the current limit. One source of background is cosmic rays that can produce one event per day that would look like a muon to electron conversion. A Cosmic Ray Veto that surrounds the Mu2e spectrometer will be used to identify and reject such cosmic-ray induced events. It must have an overall efficiency of 99.99{\%} over an area of some 330 m$^{\mathrm{2}}$. A description of the Cosmic Ray Veto, its anticipated performance, and status will be presented. [Preview Abstract] |
Friday, November 17, 2017 11:24AM - 11:36AM |
F2.00003: Approximations for the Three-Loop Cusp Anomalous Dimension Richard Udall, Nikolaos Kidonakis We analyze the behavior of the three-loop cusp anomalous dimension and its component functions. Its value as the cusp angle $\theta \rightarrow 0$ is analytically determined by utilizing the properties of harmonic polylogarithms and their relation to other functions. Approximations are given in heavy quark speed $\beta$ for both two-loop and three-loop expressions, and are optimized over the range $0.3<\beta<0.8$. Linear approximations are also given in $\theta$ which are very effective for $\theta > 5 $. [Preview Abstract] |
Friday, November 17, 2017 11:36AM - 11:48AM |
F2.00004: Results from LArIAT Beamline and Proton Selection Studies. Derek Walker LArIAT (LArTPC In A Test beam) is an R{\&}D LArTPC that seeks to measure how protons, pions, and other particles interact in liquid argon. One goal of this work is to improve the calibration of the Time of Flight (TOF) and momentum measurement systems to reduce the systematic uncertainties in the TOF and momentum scales. Calibrating the photomultiplier tubes (PMTs) of the TOF system reduced the systematic uncertainty in the TOF to 0.75ns. A second method, based on fitting the mass peaks of the particles, corroborates the TOF values found by fitting the PMTs directly. This second method also yields an estimate on the momentum calibration, finding that the momentum was measured (3.4$+$/-1.5){\%} too high. It also found a data-driven constraint on the systematic uncertainty in the momentum of about 1.5{\%}. Another goal is to find optimal selection cuts to identify proton interactions that produce charged pions. Cuts include selecting on the momentum and TOF of the particles to identity incoming protons and details on what secondary tracks are produced in order to identify when protons interact to produce pions. These cuts will be tested to see how they perform with respect to signal efficiency and background rejection. [Preview Abstract] |
Friday, November 17, 2017 11:48AM - 12:00PM |
F2.00005: Subluminal Magnetic Monopole Search with NO$\nu$A Martin J. Frank The existence of the magnetic monopole has eluded physicists for centuries. The NO$\nu$A far detector (FD), used for neutrino oscillation searches, has the additional capability to search for magnetic monopoles at subluminal velocities. With a surface area of over 4,000~m$^2$ and a location near the earth's surface, the 14~kT FD provides us with the unique opportunity to explore an area of magnetic monopole phase space previously inaccessible to underground experiments. We have designed a novel data-driven triggering scheme that continuously searches the FD's live data for monopole-like structures. At the offline level, the largest challenge in reconstructing monopoles is to reduce the 148,000~Hz speed-of-light cosmic ray background. In this talk, I will present the trigger algorithm that we employ and the offline reconstruction algorithm that will be used for the first NO$\nu$A monopole search. [Preview Abstract] |
Friday, November 17, 2017 12:00PM - 12:12PM |
F2.00006: New Search for Mirror Neutrons at HFIR Joshua Barrow, Yuri Kamyshkov, Ben Rybolt, Leah Broussard The theory of mirror matter (MM) acts as an extension to the Standard Model (SM), and predicts a hidden sector made up of a copy of SM particles and interactions but with opposite parity. MM would seldom interact with our own matter, except via gravity, making it a dark matter candidate. Mixing interactions between MM and ordinary matter would provide experimentally accessible implications in the form of neutral particle oscillations. Direct searches for neutron oscillations into mirror-neutrons in a controlled magnetic field have previously been performed using ultracold neutrons in storage/disappearance measurements, with some inconclusive results for oscillation times of $\tau \sim $10s. A proposal for future disappearance and regeneration experiments in which the neutron oscillates to and from a mirror-neutron state is forthcoming. An experiment performed using the existing General Purpose-Small Angle Neutron Scattering instrument at the High Flux Isotope Reactor at Oak Ridge National Laboratory could have the sensitivity to exclude up to $\tau $\textless 15s, with short beamtime and at low cost. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700