Physics at Virginia

"Polarized Proton-Proton Elastic Scattering at RHIC"

Stephen Bueltmann , Old Dominion University
[Host: D. G. Crabb]
The availability of polarized proton beams at RHIC opened a window to an unexplored kinematic region up to a center of mass energy of 500 GeV for elastic and diffractive proton-proton scattering. Besides the measurement of the total scattering cross section, the polarization of the protons leads to a single spin asymmetry $A_N$, arising from an interference between the electromagnetic proton spin-flip and the hadronic non-flip scattering amplitudes. The measurement is sensitive enough to detect a possible hadronic spin-flip contribution, which cannot be ruled out by the available data. Detailed theoretical model calculations are also available for the double spin asymmetries $A_{NN}$ and $A_{SS}$, assuming varying magnitudes of an Odderon contribution to the scattering amplitude, which we will be able to distinguish at the 5\% level. The Odderon is the hypothetical charge and parity odd partner of the dominant Pomeron. Preliminary data from RHIC run 09 taken with the STAR detector will be shown.
Nuclear Physics Seminar
Tuesday, October 18, 2011
3:30 PM
Physics Building, Room 204
Note special room.

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