Bulletin of the American Physical Society
82nd Annual Meeting of the APS Southeastern Section
Volume 60, Number 18
Wednesday–Saturday, November 18–21, 2015; Mobile, Alabama
Session B3: High Energy Theory |
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Chair: Romulus Godang, University of South Alabma Room: Riverview Plaza Hotel Mobile Bay Ballroom III |
Thursday, November 19, 2015 11:00AM - 11:12AM |
B3.00001: The Effective Chiral Lagrangian with Lorentz Violation Rasha Kamand Despite its many successes, the Standard Model (SM) is still incomplete and is thought to be only a part of a broader picture that hides within it new physics. In the 1990s, a framework based on low-energy effective field theory (EFT) that allows for the investigation of Lorentz violation in any sector of the SM was developed. It is known as the Standard Model Extension (SME). The SME Lagrangian is written down using elementary particles degrees of freedom, namely quarks, leptons and gauge bosons. Using the chiral symmetry properties of the quark fields and matching them onto the hadronic degrees of freedom, we construct part of the SME Lagrangian employing hadronic fields, in particular pions and nucleons, within the framework of chiral EFT. Our construction includes both pion and pion-nucleon cases where chiral symmetry results in interaction terms between pions that have not been considered before. [Preview Abstract] |
Thursday, November 19, 2015 11:12AM - 11:24AM |
B3.00002: Threshold Resummation and the Determination of Parton Distribution Functions David Westmark A precise knowledge of parton distribution functions (PDFs) is necessary to the accurate calculation of QCD observables initiated by hadrons. The deep inelastic scattering (DIS) and lepton pair production (LPP) processes are primary sources of information on PDFs. Recent global fits for PDFs have used DIS data from the large Bjorken $x$, moderate $Q^{2}$ region, where it is known that there are large logarithms that can be resummed using threshold resummation techniques. The purpose of this study is to investigate the effects of simultaneously including DIS and LPP threshold resummation in the determinations of PDFs. The results of multiple PDF fits corresponding to different choices of resummation methods are compared to recent results and used to discuss the implications of threshold resummation on PDF fits. [Preview Abstract] |
Thursday, November 19, 2015 11:24AM - 11:36AM |
B3.00003: Threshold Resummation at High Rapidities in Lepton Pair Production David Westmark It is known that large logarithms appear in the kinematic region known as threshold that can be resummed using threshold resummation. Threshold resummation techniques have been used to perform phenomenological studies of cross sections that can constrain parton distribution functions (PDFs). The lepton pair production (LPP) rapidity distribution is one such cross section, providing information to constrain sea quark PDFs. The purpose of this presentation is to demonstrate that current resummation methods for the LPP rapidity distribution are approximations that lose accuracy at high rapidities. A resummation formalism that avoids these approximations is extended to the $\overline{\mathrm{MS}}$ scheme in the minimal and Borel prescriptions, and phenomenological results using this formalism are presented. [Preview Abstract] |
Thursday, November 19, 2015 11:36AM - 11:48AM |
B3.00004: Lepton Flavor Violating Radiative Decays in EW-Scale $\nu_R$ Model: An Update Trinh Le, P. Q. Hung, Van Que Tran, Tzu-Chiang Yuan We perform an updated analysis for the one-loop induced lepton flavor violating radiative decays $l_i \to l_j \gamma$ in an extended mirror model. Mixing effects of the neutrinos and charged leptons constructed with a horizontal $A_4$ symmetry are also taken into account. Current experimental limit and projected sensitivity on the branching ratio of $\mu \to e \gamma$ are used to constrain the parameter space of the model. Calculations of two related observables, the electric and magnetic dipole moments of the leptons, are included. Implications concerning the possible detection of mirror leptons at the LHC and the ILC are also discussed. [Preview Abstract] |
Thursday, November 19, 2015 11:48AM - 12:00PM |
B3.00005: The Charmed-Strange Meson Spectrum Walter Jaronski Mesons with valence-quark content \begin{figure}[htbp] \centerline{\includegraphics[width=0.17in,height=0.20in]{141020151.eps}} \label{fig1} \end{figure} (or \begin{figure}[htbp] \centerline{\includegraphics[width=0.16in,height=0.17in]{141020152.eps}} \label{fig2} \end{figure} ) are considered in a quark potential-model approach, particularly in light of the states reported at 2860 MeV.$^{\mathrm{1}}$ The charmed-strange meson system, with its heavy charmed quark and with no truly light valence quarks (that is, no $u$ or $d$ quarks), is a useful system in which to study effective quark potentials. Distinctive features included in this work are a variable mix of Lorentz vector and Lorentz scalar in the confining potential and anomalous magnetic moments for the constituent quarks. Coupling to the four-quark sector is also considered. Model calculations of the masses of all known $D_{s}$ mesons will be presented and preliminary work on the strong decays of states above OZI threshold will be discussed. $^{\mathrm{1}}$LHCb Collaboration, R. Aaij \textit{et al., Observation of overlapping spin-1 and spin-3 } \begin{figure}[htbp] \centerline{\includegraphics[width=0.40in,height=0.23in]{141020153.eps}} \label{fig3} \end{figure} \textit{resonances at mass 2.86 GeV/c}$^{2}$, Phys. Rev. Lett. \textbf{113}. 162001 (2014) [Preview Abstract] |
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