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Measurement of the vector analyzing power in elastic electron-proton scattering as a probe of the double virtual Compton amplitude

Wells, S. P. and Carr, R. and Covrig, S. and Eppstein, C. and Filippone, B. W. and Frasier, P. and Ito, T. M. and Jones, C. and Lee, P. and Maneva, E. and McCarty, K. and McKeown, R. D. and Savu, V. and Sullivan, M. (2001) Measurement of the vector analyzing power in elastic electron-proton scattering as a probe of the double virtual Compton amplitude. Physical Review C, 63 (6). Art. No. 064001. ISSN 0556-2813. http://resolver.caltech.edu/CaltechAUTHORS:20111122-132827979

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Abstract

We report the first measurement of the vector analyzing power in inclusive transversely polarized elastic electron-proton scattering at Q^2=0.1(GeV/c)^2 and large scattering angles. This quantity must vanish in the single virtual photon exchange, plane-wave impulse approximation for this reaction, and can therefore provide information on two photon exchange amplitudes for electromagnetic interactions with hadronic systems. The observable we have measured is driven by the imaginary part of the two photon exchange amplitude, the hadronic side of which is simply the Compton amplitude for the proton with two virtual photons. We find a small but nonzero value of A=-15.4±5.4 ppm.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevC.63.064001DOIUNSPECIFIED
http://link.aps.org/doi/10.1103/PhysRevC.63.064001PublisherUNSPECIFIED
http://prc.aps.org/abstract/PRC/v63/i6/e064001PublisherUNSPECIFIED
Additional Information:© 2001 The American Physical Society. Received 22 February 2000; published 1 May 2001. The skillful efforts of the staff at MIT/Bates to provide the high-quality beam required for these measurements, and useful conversations with T.W. Donnelly, A. Afanasev, and M. Rekalo, are gratefully acknowledged. We also thank A. Afanasev for providing us with the calculations. This work was supported by NSF Grant Nos. PHY-9870278 (Louisiana Tech), PHY-9420470 (Caltech), PHY-9420787 (Illinois),PHY-9457906/PHY-9229690 (Maryland), PHY-9733773 (VPI), and U.S. DOE Cooperative Agreement No. DE-FC02-94ER40818 (MIT/Bates) and Contract No. W-31-109-ENG-38 (ANL).
Funders:
Funding AgencyGrant Number
NSFPHY-9870278
NSF (Louisiana Tech)PHY-9420470
NSF/CaltechPHY-9420787
NSF (Illinois)PHY-9457906
NSF (Maryland)PHY-9229690
NSF(VIP)PHY-9733773
Department of Energy (DOE) Cooperative AgreementDE-FC02-94ER40818
MIT/BatesW-31-109-ENG-38
Classification Code:PACS: 24.70.+s, 13.40.-f, 13.60.Fz, 14.20.Dh
Record Number:CaltechAUTHORS:20111122-132827979
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20111122-132827979
Official Citation:Measurement of the vector analyzing power in elastic electron-proton scattering as a probe of the double virtual Compton amplitude S. P. Wells et al. Published 1 May 2001 (5 pages) 064001
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27922
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:22 Nov 2011 22:32
Last Modified:26 Dec 2012 14:26

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