Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session DA: Exploring QCD through the Hadron Spectrum |
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Chair: Takashi Nakano, RNCP Osaka University Room: Hilton Kona 4 |
Thursday, October 25, 2018 9:00AM - 9:45AM |
DA.00001: Structure and compositeness of exotic hadrons Invited Speaker: Tetsuo Hyodo It is remarkable that recent experimental developments unveil the existence of many candidates of exotic hadrons, such as multiquarks, hadronic molecules, gluon hybrids, and so on. However, theoretical interpretation of the structure of a specific state is not always converged. In this talk, we introduce the compositeness of hadrons as a quantitative measure of the internal structure. In particular, the difficulty of determining the structure of unstable resonances is discussed in detail. We present several attempts to relate the compositeness to the observable quantities. Finally, we evaluate the compositeness of physical exotic hadrons, and discuss their internal structure. |
Thursday, October 25, 2018 9:45AM - 10:30AM |
DA.00002: Recent results and prospects from Belle I, Belle II and LEPS 1, LEPS 2 Invited Speaker: Masayuki Niiyama Recently, Belle experiment has reported production of excited hyperons and charmed baryons from the high statistics $e^+e^-$ annihilation data. The direct production rates of these baryons from virtual photon are measured for the first time, and new excited states of baryons are observed. The study on the production mechanisms and spectroscopy of these baryons will shed light on the internal structure of baryons. |
Thursday, October 25, 2018 10:30AM - 11:15AM |
DA.00003: Nucleon Tomography Studies at Jefferson Lab Invited Speaker: Latifa Elouadrhiri Protons and neutrons, are the building blocks of atomic nuclei. They constitute over 99 percent of the mass of the matter in the visible universe. A fundamental challenge of modern nuclear physics is to understand the structure of these constituents. The 12 GeV Upgrade of the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab and the construction of state-of –the-art detector systems make it a unique facility in the world to address this challenge. Electron scattering is a superb experimental tool to study the internal structure of nucleons at differing distance scales, as the resolving power of the probe can be varied. The CEBAF Upgrade was completed in September 2017 and the new generation of experiments has started. These experiments will enable a collaboration of scientists from around the world to perform precise experiments of exclusive processes covering a large range in kinematics to effectively engage in nuclear imaging, revealing hidden aspects of its internal structure, and providing insight into quark confinement forces in the nucleon, one of the greatest mysteries of modern physics.
The Generalized Parton Distributions (GPDs) provide the theoretical framework to interpret the experimental data in terms of 3-dimensional imaging. In addition, recent development demonstrated that the GPD formalism enables access to the nucleon’s Gravitational Form Factors that encode its mechanical properties. We will focus on the study of the Deeply Virtual Compton Scattering (DVCS), the most effective way to access GPDs. We will review the landscape of both theory and experiment, and discuss the latest results from Jefferson Lab at 6 GeV in comparison with results from other facilities, and present a first look at the new experiments with the 12 GeV Upgrade.
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Thursday, October 25, 2018 11:15AM - 12:00PM |
DA.00004: Precision and Exotics in Photoproduction with GlueX Invited Speaker: Sean Dobbs The search for hybrid mesons and the detailed study of their spectrum is the primary goal of the GlueX Experiment in Hall D at Jefferson Lab, which promises to provide unique insight into gluonic degrees of freedom in QCD and the nature of confinement. The experiment combines an intense photon beam with linear polarization peaking around 9 GeV incident on a liquid hydrogen target with a nearly hermetic spectrometer, allowing for the comprehensive study of charged and neutral particle final states. GlueX began physics running in early 2017, and is currently finishing the first stage of data collection, in which orders of magnitude more data have been collected than earlier experiments at this energy. This talk will report on the status of the analysis of this photoproduction data, including the measurement of polarization observables to study the nature of production processes, prospects for spectroscopy and amplitude analysis for the study of the light meson spectrum and hybrid meson searches, and other measurements enabled by the GlueX data, such as the photoproduction of J/psi near threshold. |
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