Bulletin of the American Physical Society
APS April Meeting 2015
Volume 60, Number 4
Saturday–Tuesday, April 11–14, 2015; Baltimore, Maryland
Session S8: Invited Session: Hadron Spectroscopy from JLab to EIC |
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Sponsoring Units: GHP Chair: Ramona Vogt, Lawrence Berkeley National Laboratory Room: Key 4 |
Monday, April 13, 2015 1:30PM - 2:06PM |
S8.00001: Opportunities in Photoproduction and Spectroscopy at an EIC Invited Speaker: Justin Stevens In recent years, a large number of new states have been observed in the spectrum of heavy quark mesons, both in $e^+e^-$ collisions and in the decays of $B$ mesons. These states, referred to as $XYZ$ mesons, were not expected in the spectrum of heavy quark-antiquark bound states, and their interpretation remains uncertain. The photoproduction process provides an attractive and complementary production mechanism to study these exotic states and potentially discover new states which are challenging to access through other mechanisms. The proposed Electron-Ion Collider (EIC) is a new high-energy and high-luminosity electron-ion machine with a versatile range of kinematics and beam polarizations, capable of providing new opportunities to study heavy quark meson spectroscopy through photoproduction. In this talk, I will review the recent progress in heavy quark meson spectroscopy and discuss the prospects for hadron spectroscopy at an EIC. [Preview Abstract] |
Monday, April 13, 2015 2:06PM - 2:42PM |
S8.00002: Photoproduction of Structure in the $d\pi$ System Near the $N\Delta$ mass: Sign of a Quasi-Bound State? Invited Speaker: Reinhard Schumacher Results from nucleon-nucleon and pion-deuteron scattering analysis show attractive resonance-like behavior in certain partial waves. But evidence for clear-cut baryon-baryon (quasi-) bound states other than the deuteron remains lacking, despite theoretical expectations that they can exist. In recent years some measurements using $pd$ scattering have interpreted a broad bump in the $d \pi\pi$ invariant mass distribution in terms of a $\Delta\Delta$ dibaryonic resonance. If such a quasi-bound state exists, then one supposes that an $N\Delta$ quasi-bound state exists also, as supported by recent Fadeev-model calculations of the $\pi N N$ system. Here we discuss ongoing work looking at the $\gamma d \to d \pi^+ \pi^-$ reaction using the CLAS detector at Jefferson Lab. A Dalitz-plot analysis shows structure in the invariant mass distributions in $(d\pi)^{++}$ and $(d\pi)^{0}$ systems. Both are near the center of the $N\Delta$ mass distribution. Possible interpretations of this observation will be discussed. [Preview Abstract] |
Monday, April 13, 2015 2:42PM - 3:18PM |
S8.00003: Physics Analysis Center at JLab Invited Speaker: Adam Szczepaniak Research at the Physics Analysis Center at JLab focuses on development of theoretical, phenomenological and computational tools need in analysis of data from the forthcoming experiments in hadron physics. I will discuss the ongoing projects, challenges and opportunities given the forthcoming high precision data from the Jefferson Lab and other facilities. [Preview Abstract] |
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