Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session C3: Medium Modifications of Hadronic Properties |
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Sponsoring Units: DNP Chair: Steffen Strauch, George Washington University Room: Marriott Tampa Waterside Grand Salon A/B |
Saturday, April 16, 2005 1:30PM - 2:06PM |
C3.00001: Modification of Hadronic Properties in Hot/Dense Matter Invited Speaker: Modifications of hadronic properties in hot and/or dense matter can, in principle, encode information on (precursor) effects related to the chiral phase transition. After a brief introduction to chiral symmetry breaking and its manifestations in the hadron spectrum in vacuum, we review various approaches to assess in-medium effects on hadrons. We emphasize that chiral symmetry alone implies substantial modifications in matter, as spectral functions of ``chiral partners'' (e.g. $\pi$ and ``$\sigma$,'' $\rho$ and $a_1$) are required to (approximately) degenerate at the phase transition. We furthermore discuss applications to, and interrelations of, experiments at RHIC and JLAB (including dilepton, dipion and pi-N spectra), and attempt to identify future directions. [Preview Abstract] |
Saturday, April 16, 2005 2:06PM - 2:42PM |
C3.00002: Possible Medium Modifications of Resonances at RHIC Invited Speaker: In-medium modifications of resonances due to effects of increasing temperature and density have been proposed as a possible signal of a phase transition of nuclear matter to a deconfined plasma of quarks and gluons. Even in the absence of the phase transition, at lower temperature and density, modifications of resonances are expected to be measurable. Effects such as phase space and dynamical interactions with matter may modify the resonance mass, width, and shape. The effects of phase space due to the rescattering of hadrons and Bose-Einstein correlations between the daughters from resonance decays and the hadrons in the surrounding matter are present in p+p, d+Au, and Au+Au collisions at RHIC. The interference between different hadrons scattering channels can also effectively distort the line shape of resonances. Results from resonances measured at RHIC, such as $\rho(770)^0 \rightarrow \pi^+\pi^-$, will be presented and the possible medium modification due to the effects listed above will be discussed. [Preview Abstract] |
Saturday, April 16, 2005 2:42PM - 3:18PM |
C3.00003: Search for Medium Modifications of Vector Meson Properties Invited Speaker: \begin{document} The properties of vector mesons, such as their mass and width, are predicted to be modified in dense medium such as a nucleus. This modification, if proven to exist, could be related to more fundamental physics such as a partial restoration of chiral symmetry at high density. The g7 (or E01-112) experiment has been designed to look for medium effects on the properties of the light vector mesons ($\rho$, $\omega$, and $\phi$) in photoproduction, through their rare leptonic decay into $e^+e^- $. This decay channel has been preferred to the two pion channel to avoid distorting the information by strong final interaction. The data for this experiment was taken in the fall of 2002 using the CLAS detector at the Jefferson Lab. A bremstrahlung photon beam was sent on a target containing a liquid deuterium cell and several nuclear targets: C, Fe, Ti, and Pb. First results will be presented. \end{document} [Preview Abstract] |
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