Bulletin of the American Physical Society
2008 APS April Meeting and HEDP/HEDLA Meeting
Volume 53, Number 5
Friday–Tuesday, April 11–15, 2008; St. Louis, Missouri
Session S3: DNP Dissertation Awards |
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Sponsoring Units: DNP Chair: Richard Casten, Yale University Room: Hyatt Regency St. Louis Riverfront (formerly Adam's Mark Hotel), St. Louis E |
Monday, April 14, 2008 1:30PM - 2:06PM |
S3.00001: Investigating Neutron Polarizabilities through Compton Scattering on Light Nuclei Invited Speaker: This talk will focus on elastic Compton scattering on He-3 as an instrument to extract the neutron polarizabilities. The calculations for this process have been performed for photon energies comparable to the pion mass within the framework of Chiral effective field theory. The results show that these computations, when used in concert with future data from HIGS and results from elastic deuteron Compton scattering, should give significant new information about the neutron polarizabilities. [Preview Abstract] |
Monday, April 14, 2008 2:06PM - 2:42PM |
S3.00002: Using neutrinos to study the earth Invited Speaker: Mantle convection and earthquakes are generally thought to be driven by the heat produced from uranium and thorium decays inside the earth. The KamLAND experiment has recently observed neutrinos originating from these decays, pioneering a new way to probe the earth's interior. While this measurement is consistent with earth models based on the chemical composition of meteorites and heat flow measurements on the earth's surface, it is not precise enough to constrain those models. It is interesting to note that we still know less about the nuclear reactions within the earth, just below out feet, than within the sun, an object 92 million miles away. More precise future measurements of neutrinos from the earth will have a significant impact on our understanding of the earth by constraining mantle convection and earth formation models. I will discuss my dissertation geoneutrino measurement with KamLAND, and plans for future experiments. [Preview Abstract] |
Monday, April 14, 2008 2:42PM - 3:18PM |
S3.00003: Precision measurement of the weak charges of quarks Invited Speaker: The Standard Model has been enormously successful at predicting the outcomes of experiments in nuclear and particle physics. The search for new physical phenomena and a fundamental description of nature which goes beyond the Standard Model is driven by two complementary experimental strategies. The first is to build increasingly energetic colliders, such as the Large Hadron Collider (LHC) at CERN, which aim to excite matter into a new form. The second, more subtle approach is to perform precision measurements at moderate energies, where an observed discrepancy with the Standard Model will reveal the signature of these new forms of matter. Here we use precision parity-violating electron scattering measurements on nuclear targets to extract the weak charges of the quarks. The result is found to be in excellent agreement with the predictions of the Standard Model. Combining this result with earlier measurements of the low-energy weak force, most notably data on parity violation in atomic cesium, lifts the relevant energy scale for physics beyond the Standard Model to almost 1 TeV. [Preview Abstract] |
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