Bulletin of the American Physical Society
Annual Meeting of the Four Corners Section of the APS
Volume 59, Number 11
Friday–Saturday, October 17–18, 2014; Orem, Utah
Session K3: Particle Physics III |
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Chair: Steve Wasserbaech, Utah Valley University Room: Science Building 139 |
Saturday, October 18, 2014 1:15PM - 1:39PM |
K3.00001: Lattice QCD and the search for new physics using beauty quarks Invited Speaker: Stefan Meinel One of the most promising ways of searching for physics beyond the Standard Model is the precision study of processes in which quarks change their flavor through the weak interaction. Such processes are sensitive to quantum effects of new elementary particles that are too heavy to be produced directly in high-energy collisions. The challenge is that quarks are strongly interacting with gluons and are bound inside hadrons. To search for new physics in hadronic processes, the effects of the strong interactions need to be calculated using lattice QCD, a numerical method requiring supercomputers. In this talk I will give an introduction to lattice QCD, and discuss its application to decays of beauty quarks. For these decays there are currently some deviations between calculations and experimental measurements, which may be hints of physics beyond the Standard Model. [Preview Abstract] |
Saturday, October 18, 2014 1:39PM - 1:51PM |
K3.00002: Searching for X(3872) using lattice QCD Song-haeng Lee, Carleton DeTar In the past decade, many excited charmonium states have been discovered that cannot be explained within the conventional quark model. One of the those mesons, the narrow charmonium-like state $X(3872)$ has been examined using various phenomenological models. Since its mass is within 1~MeV of the $D\bar D^*$ threshold, one of the strong candidates is a $D\bar D^*$ molecular state. However, such a molecular state cannot be directly studied by perturbative QCD in such a low energy regime where the interaction of the colored quarks and gluons is very strong. Numerical simulation with lattice QCD is the method of choice. It provides a nonperturbative, {\it ab initio} method for studying this mysterious meson state. In this talk, I present preliminary simulation results for charmonium-like states with quantum numbers $J^{\rm PC} = 1^{++}$ in both the isospin 0 and 1 channels using lattice QCD. We use interpolating operators including both the conventional excited P-wave charmonium state($\chi_{c1}$) and the $D\bar D^*$ open charm state for the isospin 0 channel, but only $D\bar D^*$ for the isospin 1 channel. We find an $X(3872)$ candidate close to and below the $D\bar D^*$ threshold in the isospin 0 channel, but only scattering states in the isospin 1 channel. [Preview Abstract] |
Saturday, October 18, 2014 1:51PM - 2:03PM |
K3.00003: Removing power divergent mixing from nonperturbative matrix elements Christopher Monahan, Kostas Orginos Parton distribution functions (PDFs) are one of the primary theoretical tools connecting hadrons to their constituent quarks and gluons. Ab initio determinations of PDFs from lattice quantum chromodynamics have been hindered by power-divergent mixing arising from the broken Lorentz symmetry of the lattice. We discuss a new method to extract nonperturbative matrix elements free from power divergent mixing. Our method is quite general and extends to a range of lattice calculations subject to power divergent mixing, such as the matrix elements for K to pi pi decays and neutral B-meson mixing. [Preview Abstract] |
Saturday, October 18, 2014 2:03PM - 2:15PM |
K3.00004: Strange Brew Pearl Sandick Direct dark matter searches continue to increase their reach in the WIMP parameter space, searching for the scattering of dark matter particles with nuclei. In the case of spin independent elastic scattering, in order to compare the predictions from various particle physics models with the limits (or discovery) from a search, it is necessary to know how WIMPs couple to all quarks that make up the protons and neutrons with which the WIMPs will scatter. Currently, the dominant nuclear physics uncertainty is the strange quark content of the nucleon. In this talk, I'll review dark matter-nucleon scattering and discuss the sensitivity of direct dark matter searches to supersymmetric scenarios in some interesting limiting cases. [Preview Abstract] |
Saturday, October 18, 2014 2:15PM - 2:27PM |
K3.00005: Possible appearance of an event horizon in high energy collisions and in strong interaction of particles Alexander Panin General relativity predicts that a motion with acceleration creates an event horizon behind the accelerating object (at the distance c$^2$/2a where a is the magnitude of the acceleration, c -- speed of light). When high energy particles collide they undergo strong acceleration which should result in the appearance of a dynamic event horizon (DEH) nearby. This event horizon may limit the strength of their mutual interaction as well as the interaction with the distant surrounding (while they are in accelerated motion). While this effect is negligible on the atomic scale (due to small accelerations involved), it could be observable in short range collisions of high energy particles. This effect (the appearance of DEH) can also explain the difference in the strengths of fundamental interactions as GR corrections imposed on a single (unified) interaction when the interacting particles are in the different state of motion. [Preview Abstract] |
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