Bulletin of the American Physical Society
Joint Meeting of the Four Corners and Texas Sections of the American Physical Society
Volume 61, Number 15
Friday–Saturday, October 21–22, 2016; Las Cruces, New Mexico
Session H3: Particle Physics |
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Chair: Matthias Burkardt, New Mexico State University Room: Meeting Room 2&3 |
Saturday, October 22, 2016 9:36AM - 10:00AM |
H3.00001: Quark transverse dynamics and orbital angular momentum in the nucleon from Lattice QCD Invited Speaker: Michael Engelhardt An ongoing program of evaluating transverse momentum-dependent parton distributions (TMDs) within Lattice QCD is reviewed, summarizing recent progress with respect to several challenges faced by such calculations. These lattice calculations are based on a definition of TMDs through hadronic matrix elements of quark bilocal operators containing staple-shaped gauge connections. A parametrization of the matrix elements in terms of invariant amplitudes serves to cast them in the Lorentz frame preferred for a lattice calculation. Results presented include data on the naively T-odd Sivers and Boer-Mulders effects, as well orbital angular momentum extracted from generalized TMDs. [Preview Abstract] |
Saturday, October 22, 2016 10:00AM - 10:12AM |
H3.00002: The Orbital Angular Momentum Sum Rule Fatma Aslan, Matthias Burkardt As an alternative to the Ji sum rule for the quark angular momentum, a sum rule for the quark orbital angular momentum, based on a twist-3 generalized parton distribution, has been suggested. We study the validity of this sum rule in the context of scalar Yukawa interactions as well as in QED for an electron. [Preview Abstract] |
Saturday, October 22, 2016 10:12AM - 10:24AM |
H3.00003: Search for New Physics in Bottom Baryon Decays using Lattice QCD Gumaro Rendon, Stefan Meinel With the discovery of the Higgs boson in 2012, the last missing elementary particle of the Standard Model was found, but certain unexplained phenomena and theoretical arguments suggest that we still do not have a complete theory. It is therefore our task to further test the Standard Model in a wide range of energy scales. Experimental results for decays involving a bottom-to-strange-quark transition show a pattern of deviations from Standard-Model predictions, which could be due to new fundamental physics. Aiming to better understand these deviations, we perform calculations using lattice quantum chromodynamics for the heavy-baryon decay process $\Lambda_b \to \Lambda(1520) \mu^+\mu^-$. In this talk I present preliminary results from this project. [Preview Abstract] |
Saturday, October 22, 2016 10:24AM - 10:36AM |
H3.00004: Search for pair production of vector-like quarks that decay to a Z boson and a third-generation quark in trilepton final states in pp collisions at $\sqrt{s}$=13 TeV with the ATLAS detector You Zhou, Elliott Cheu A search is outlined for the pair production of vector-like quarks that decay to a Z boson and a third-generation Standard Model quark. In the case of a charge $+2/3$ vector-like quark ($T$), the decay targeted is $T \rightarrow Zt$, while the decay targeted for a charge $ -1/3$ vector-like quark ($B$) is $B \rightarrow Zb$. Selected events contain a high transverse momentum Z boson candidate reconstructed from a pair of oppositely charged same-flavor leptons (electrons or muons), and are analyzed in the final states defined by the presence of a third lepton. Hadronic jets, in particular those with properties consistent with the decay of a b-hadron, are also required to be present in selected events. The agreement between the simulated data and observed data is examined in various control regions defined by the absence of b-tagged jets and Z boson candidates with low transverse momentum. The lower limits are derived on the mass of vector-like $T$ and $B$ quarks considering only the statistical uncertainties under various branching ratio hypotheses. [Preview Abstract] |
Saturday, October 22, 2016 10:36AM - 10:48AM |
H3.00005: Application of Diodes to Measure Particle Beam Fluences Relevant to HL-LHC Requirements by Cooling and Current Reduction Robert Reyna The University of New Mexico ATLAS group has developed a device used for real-time monitoring of particle beam profile and fluence up to 10$^{15}$ n$_{eq}$/cm$^{2}$. The device is based on an array of OSRAM BPW34 PIN diodes, the forward voltage of which increases linearly with fluence over the range 2x10$^{12}$ to 1x10$^{15}$ n$_{eq}$/cm$^{2}$ at room temperature, before reaching saturation. The aim of my project is to explore the possibility of extending this linear range to a higher limit for consistency with silicon tracker upgrade requirements at the HL-LHC. We examine both cooling the diodes and decreasing the applied forward current used to measure forward voltage. [Preview Abstract] |
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