Bulletin of the American Physical Society
APS April Meeting 2018
Volume 63, Number 4
Saturday–Tuesday, April 14–17, 2018; Columbus, Ohio
Session U09: QCD and Hadrons |
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Sponsoring Units: DPF DNP Chair: Stephen Sekula, Southern Methodist University Room: A111 |
Monday, April 16, 2018 3:30PM - 3:42PM |
U09.00001: The KOTO experiment at J-PARC and the search for KL Brian Beckford The KOTO experiment has a goal to discover and measure the rate of the rare $K_{L} \to \pi^{0}\nu \overline \nu $ decay. This flavor changing neutral current (FCNC) decay proceeds through second-order weak interactions. The process occurs through a $\Delta S \quad =$ 1 transition and may be as expressed by the electroweak penguin and box diagrams. This decay is an ideal candidate to search for physics beyond the standard model. The SM prediction for the branching ratio is 3.0 x $10^{-11}$ with a small theoretical uncertainty of about 2-3{\%}. The current experimental limit of BR \textless 2.6 \texttimes 10$^{\mathrm{-8}}$ is from the KEK E391a experiment. Motivated by the success of the KEK E391a experiment, the KOTO is intended to pursue the search with an upgraded data acquisition system and detectors. Our signal is a pair of photons from the $\pi^{0}$decay and no other detected particles. The detectors is composed of a Cesium Iodide (CsI) calorimeter as the main detector used for the measurement of photons. All other detectors work as hermetic veto counters. We have taken additional data since the first 2013 run. This talk will discuss the status of the analysis of the data, ongoing detector upgrades, and future plans. [Preview Abstract] |
Monday, April 16, 2018 3:42PM - 3:54PM |
U09.00002: A search for an excited bottom quark decaying to a top quark and W boson in pp collisions at $\sqrt{s}$ = 13 TeV Lucas Corcodilos A search is performed for the production of an excited b quark, b*, decaying to a top quark and a W boson in all-hadronic final states. The data analyzed was recorded with the CMS detector at the LHC in proton-proton collisions at $\sqrt{s}$ = 13 TeV. Since this search covers b* masses in excess of 1 TeV, the hadronic decay products are expected to have high momentum and will thus merge producing a single hadronic jet for each the top and W. This search uses jet substructure algorithms to distinguish the top quark and W boson jets from standard model QCD background. The remaining QCD background is estimated using a data driven technique that interpolates background behavior from events with an enhanced QCD multijet component and small signal contamination. [Preview Abstract] |
(Author Not Attending)
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U09.00003: Abstract Withdrawn
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Monday, April 16, 2018 4:06PM - 4:18PM |
U09.00004: Quarkonium Production in Jets Thomas Mehen This talk will describe new tests of quarkonium production using quarkonia that are produced within jets. We study the distribution in the fraction $z$ of a jet's longitudinal momentum carried by the quarkonium. The $z$ distribution is sensitive to the underlying NRQCD production mechanism. Analytic calculations of the $z$ distributions in SCET that incorporate Next-to-Leading-Log (NLL) resummation disagree with default PYTHIA predictions. We describe a modified simulation method which agrees well with NLL analytic calculations. This method is then successfully applied to recent LHCb measurements of $J/\psi$ within jets. We discuss the implications of this measurement for extractions of NRQCD long-distance matrix elements. Finally, we discuss other observables involving quarkonium within jets which may be useful for discriminating between NRQCD production mechanisms. [Preview Abstract] |
Monday, April 16, 2018 4:18PM - 4:30PM |
U09.00005: The Neutral Pion Radiative Decay Width Precision Measurement at Jefferson Lab Ilya Larin The properties of $\pi^{\mathrm{0\thinspace }}$decay are especially sensitive to the fundamental symmetries of quantum chromodynamics (QCD). In particular, the neutral pion decay width is primarily defined by the spontaneous chiral symmetry breaking effect (chiral anomaly) in QCD. The PrimEx experiments in Hall B at Jefferson lab were aimed to perform a precision measurement of the $\pi^{\mathrm{0}}$-\textgreater $\gamma \gamma $ decay width via Primakoff effect. The result from the first (PrimEx I) experiment has 2.8{\%} accuracy. The second (PrimEx II) experiment with several times more statistics than the PrimEx I and an improved systematics was aimed to achieve a better than 2.0{\%} precision. An updated PrimEx II result will be presented. [Preview Abstract] |
Monday, April 16, 2018 4:30PM - 4:42PM |
U09.00006: Search for Exotic Mesons at CMS Suleyman Durgut Exotic meson spectroscopy searches at the LHC yielded interesting results. Using an integrated luminosity of 25.6 inverse femtobarn recorded in proton-proton collisions at 7 TeV and 8 TeV, CMS searched enhancements in multi-lepton final states in the mass range below the Y(1S)Y(1S) mass. Results will be presented and discussed. [Preview Abstract] |
Monday, April 16, 2018 4:42PM - 4:54PM |
U09.00007: Symmetry breaking corrections to Axial vector Mesons at Large Recoil using LEET and SCET Arslan Sikandar, Muhammad Jamil Aslam Symmetries appearing in heavy quark limit put various constraints on decay of B mesons at large recoil. These symmetries are broken by radiative corrections and hard spectator interactions. In this work, we calculated the corrections to the form factors of heavy B meson to light axial mesons at large recoil. As an application, we studied the rare decay of $B\rightarrow K_1 l^+ l^-$ and the forward backward asymmetry. These form factors with symmetry breaking corrections are later calculated in SCET and the theoretical results are compared to the experimental results. [Preview Abstract] |
Monday, April 16, 2018 4:54PM - 5:06PM |
U09.00008: Charmed Baryon to Strange Baryon Decay using QCD Sum Rules Bijit Singha, Leonard Kisslinger We estimate the rate of the Cabibbo-favored weak decay, $\Lambda_c^+ \rightarrow \Lambda_s^0~ \pi^+$, using QCD Sum Rules. A three-point correlation function of field operators corresponding to charmed lambda ($\Lambda_c^+$), strange lambda ($\Lambda_s^0$), and weak Hamiltonian ($H_W$) is considered in the presence of an external pion field. We evaluate the lowest-order perturbative diagram in which the charm quark decays into the strange quark via a weak-charged current. A dispersion relation is used for the correlator obtained from the OPE, and a Borel transform is carried out to ensure rapid convergence. After comparing the decay rate for this process to the strong decay mode, $\Lambda_c^+ \rightarrow p K^- \pi^+$, we find this weak decay to be small and consistent with experimental observations. [Preview Abstract] |
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