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Nuclear Physics Seminars

ics Nuclear
Tuesday, November 23, 2010
3:30 PM
Physics Building, Room 204
Andrew Puckett [Host: Nilanga Liyanage]
Los Alamos Nuclear Laboratory
"Proton Form Factors: Recent Developments"
 Slideshow (PDF)
The elastic electromagnetic form factors of the nucleon are among the most important observables characterizing its structure. Accurate knowledge of the proton form factors at large momentum transfers is required to test predictions of perturbative QCD, to constrain the nucleon Generalized Parton Distributions (GPDs), and to determine the nucleon's model-independent transverse charge and magnetization densities at small impact parameters. Through their relationship to GPDs, the nucleon form factors are also relevant to the nucleon spin puzzle, helping to evaluate Ji's angular momentum sum rule. In this seminar, I will present and discuss the results of recent recoil polarization measurements of the proton electric-to-magnetic form factor ratio. These results extend the momentum transfer reach of the method to Q2=8.5 GeV2, an increase of more than 50%. Additionally, our precise measurements at Q2=2.5 GeV2 will constrain models of multi-photon exchange effects believed responsible for the discrepancy between the Rosenbluth and polarization experiments.

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