Bulletin of the American Physical Society
APS April Meeting 2011
Volume 56, Number 4
Saturday–Tuesday, April 30–May 3 2011; Anaheim, California
Session B4: Hadron Spectroscopy and Exotic Particle Searches |
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Sponsoring Units: DNP Chair: Barry Ritchie, Arizona State University Room: Garden 4 |
Saturday, April 30, 2011 10:45AM - 11:21AM |
B4.00001: The search for exotic hadrons, and the hadron spectrum Invited Speaker: Hadrons have been conventionally described as made up of three quarks (baryons) or a quark-antiquark pair (mesons) bound by a confining potential, with short-range interactions motivated by what is known about quantum chromodynamics (QCD). The ground and excited states of these systems can account for most known hadrons. However, there is no reason why the gluon field binding the quarks into hadrons cannot itself be excited, and there can be any number of additional quark-antiquark pairs present. Recent rapid progress has been made using the lattice field theoretical approach to describing such states, and conventional hadrons, using QCD. In some cases unconventional hadrons can have exotic properties that give them unique experimental signatures. Theoretical predictions for such states and the evidence for their existence will be reviewed, along with the status of experiments designed to search for them. [Preview Abstract] |
Saturday, April 30, 2011 11:21AM - 11:57AM |
B4.00002: Discovery of anti-hypertriton and future exotic particle searches at RHIC Invited Speaker: While nuclei are abundant in the universe, antimatter nuclei that are heavier than the antiproton have been observed only as products of interactions at particle accelerators. Nuclear collisions recreate conditions similar to that of the universe microseconds after the Big Bang. The subsequent rapid expansion of Quark-Gluon Plasma in nuclear collisions is significantly different from the case of the Big Bang. This decouples matter and antimatter before annihilation, and provides an ideal laboratory for producing and studying heavy antimatter. We present the discovery of the heaviest known antimatter and the first antihypernucleus - the antihypertriton, which is comprised of an antiproton, an antineutron and their heavier strange partner (antilambda). The production and discovery of even heavier antimatter with the existing facilities and their implications will also be discussed. [Preview Abstract] |
Saturday, April 30, 2011 11:57AM - 12:33PM |
B4.00003: Searching for a Dark Photon at JLab Invited Speaker: Low energy but high intensity electron beams offer a unique opportunity to probe physics beyond the standard model. While high luminosity experiments are usually envisioned as providing an indirect probe of TeV-scale new physics, recent experiments proposed at Jefferson Laboratory are focused on using inverse attobarn datasets to gain direct evidence for new GeV-scale resonances. These GeV-scale particles have small enough couplings to have not been seen at previous high luminosity experiments such as the B-factories, but large enough couplings to evade bounds from beam dump and astrophysical probes. New physics at the GeV-scale has a variety of different motivations, from indirect and direct detection of dark matter, to the anomalous magnetic moment of the muon, to models of supersymmetry breaking, and in many cases GeV-scale physics and TeV-scale physics are intertwined. But regardless of the motivation, the CEBAF and ERL accelerators at Jefferson Laboratory are ideal platforms to launch the next generation of fixed-target experiments searching for weakly-coupled, GeV-scale resonances. In this talk, I will summarize the motivation for GeV-scale physics and the reasons why JLab is uniquely positioned to discover a ``dark photon''. I will then highlight three experimental efforts at JLab: the APEX experiment in CEBAF Hall A which has just completed a test run; the proposed HPS experiment in CEBAF Hall B; and the proposed DarkLight experiment using the energy recovery linac. [Preview Abstract] |
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