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Transverse beam spin asymmetries in forward-angle elastic electron-proton scattering (2007) |
- Armstrong, D.S.,
- Arvieux, J.,
- Asaturyan, R.,
- Averett, T.,
- Bailey, S.L.,
- Batigne, G.,
- Beck, D.H.,
- Beise, E.J.,
- Benesch, J.,
- Bimbot, L.,
- Birchall, J.,
- Biselli, A.,
- Bosted, P.,
- Boukobza, E.,
- Breuer, H.,
- Carlini, R.,
- Carr, R.,
- Chant, N.,
- Chao, Y.-C.,
- Chattopadhyay, S.,
- Clark, R.,
- Covrig, S.,
- Cowley, A.,
- Dale, D.,
- Davis, C.,
- Falk, W.,
- Finn, J.M.,
- Forest, T.,
- Franklin, G.,
- Furget, C.,
- Gaskell, D.,
- Grames, J.,
- Griffioen, K.A.,
- Grimm, K.,
- Guillon, B.,
- Guler, H.,
- Hannelius, L.,
- Hasty, R.,
- Hawthorne Allen, A.,
- Horn, T.,
- Johnston, K.,
- Jones, M.,
- Kammel, P.,
- Kazimi, R.,
- King, P.M.,
- Kolarkar, A.,
- Korkmaz, E.,
- Korsch, W.,
- Kox, S.,
- Kuhn, J.,
- Lachniet, J.,
- Lee, L.,
- Lenoble, J.,
- Liatard, E.,
- Liu, J.,
- Loupias, B.,
- Lung, A.,
- Marchand, D.,
- Martin, J.W.,
- Mcfarlane, K.W.,
- Mckee, D.W.,
- Mckeown, R.D.,
- Merchez, F.,
- Mkrtchyan, H.,
- Moffit, B.,
- Morlet, M.,
- Nakagawa, I.,
- Nakahara, K.,
- Neveling, R.,
- Niccolai, S.,
- Ong, S.,
- Page, S.,
- Papavassiliou, V.,
- Pate, S.F.,
- Phillips, S.K.,
- Pitt, M.L.,
- Poelker, M.,
- Porcelli, T.A.,
- Quéméner, G.,
- Quinn, B.,
- Ramsay, W.D.,
- Rauf, A.W.,
- Réal, J.S.,
- Roche, J.,
- Roos, P.,
- Rutledge, G.A.,
- Secrest, J.,
- Simicevic, N.,
- Smith, G.R.,
- Spayde, D.T.,
- Stepanyan, S.,
- Stutzman, M.,
- Sulkosky, V.,
- Tadevosyan, V.,
- Tieulent, R.,
- Van De Wiele, J.,
- Van Oers, W.,
- Voutier, E.,
- Vulcan, W.,
- Warren, G.,
- Wells, S.P.,
- Williamson, S.E.,
- Wood, S.A.,
- Yan, C.,
- Yun, J.,
- Zeps, V.
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Abstract |
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We have measured the beam-normal single-spin asymmetry in elastic scattering of transversely-polarized 3 GeV electrons from unpolarized protons at Q^2 values of 0.15 and 0.25 (GeV/c)^2 with results of A_n = -4.06 +- 0.99 (stat) +- 0.63 (syst) and A_n = -4.82 +- 1.87 (stat) +- 0.98 (syst) ppm. These results are inconsistent with calculations solely using the elastic nucleon intermediate state, and generally agree with calculations with significant inelastic hadronic intermediate state contributions. A_n provides a direct probe of the imaginary component of the 2-gamma exchange amplitude, the complete description of which is important in the interpretation of data from precision electron-scattering experiments. |
Publication details |
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