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Measurement of the vector analyzing power in elastic electron-proton scattering as a probe of the double virtual Compton amplitude - art. no. 064001

Authors

Wells, SP Averett, T Barkhuff, D Beck, DH Beise, EJ Benson, C Breuer, H Carr, R Covrig, S DelCorso, J Dodson, G Eppstein, C Farkhondeh, M Fillippone, BW Forest, TA Frasier, P Hasty, R Ito, TM Jones, C Korsch, W Kowalski, S Lee, P Maneva, E McCarty, K McKeown, RD Mikell, J Mueller, B Naik, P Pitt, ML Ritter, J Savu, V Spayde, DT Sullivan, M Tieulent, R Tsentalovich, E Yang, B Zwart, T

Citation

Sp. Wells et al., Measurement of the vector analyzing power in elastic electron-proton scattering as a probe of the double virtual Compton amplitude - art. no. 064001, PHYS REV C, 6306(6), 2001, pp. 4001

Citations number

Categorie Soggetti

Physics

Journal title

PHYSICAL REVIEW C

ISSN journal

05562813 → ACNP

Volume

6306

Issue

Year of publication

2001

Database

ISI

SICI code

0556-2813(200106)6306:6<4001:MOTVAP>2.0.ZU;2-U

Abstract

We report the first measurement of the vector analyzing power in inclusive transversely polarized elastic electron-proton scattering at Q(2) = 0.1 (Ge V/c)(2) and large scattering angles. This quantity must vanish in the singl e virtual photon exchange, plane-wave impulse approximation for this reacti on, 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 am plitude, 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.