Longitudinal and Transverse Cross Sections in the 1H(e,e′K+)Λ Reaction

Niculsescu, G.; Mohring, R.M.; Gueye, P.; Abbott, D.; Ahmidouch, A.; Amatuni, Ts.A.; Ambrozewicz, P.; Angelescu, T.; Armstrong, C.S.; Assamagan, K.; Avery, S.; Bailey, K.; Baker, O.K.; Beard, K.; Beedoe, S.; Beise, E.; Breuer, H.; Carlini, R.; Cha, J.; Chang, C.C.; Chant, N.; Cisbani, E.; Collins, G.; Cummings, W.; Danagoulian, S.; DeLeo, R.; Duncan, F.; Dunne, J.; Dutta, D.; Eden, T.; Ent, R.; Eyraud, L.; Ewell, L.; Finn, M.; Fortune, T.; Frolov, V.; Frullani, S.; Furget, C.; Garibaldi, F.; Gaskell, D.; Geesaman, D.F.; Gustafsson, K.K.; Hansen, J.-O.; Harvey, M.; Hinton, W.; Hungerford, E.; Iodice, M.; Jackson, C.; Keppel, C.; Kim, W.; Kino, K.; Koltenuk, D.; Kox, S.; Kramer, L.; Leone, T.; Lolos, G.; Lung, A.; Mack, D.; Madey, R.; Maeda, M.; Majewski, S.; Markowitz, P.; Martoff, C.J.; Meekins, D.; Mihul, A.; Mitchell, J.; Mkrtchyan, H.; Mtingwa, S.; Niculescu, I.; Perrino, R.; Potterveld, D.; Price, J.W.; Raue, B.A.; Real, J.-S.; Reinhold, J.; Roos, P.; Saito, T.; Savage, G.; Sawafta, R.; Segel, R.; Stepanyan, S.; Stoler, P.; Tadevosian, V.; Tang, L.; Teodorescu, L.; Terasawa, T.; Tsubota, H.; Urciuoli, G.M.; Volmer, J.; Vulcan, W.; Welch, P.; Williams, R.; Wood, S.; Yan, C.; Zeidman, B.

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Date

1998-08-31

Author

Niculsescu, G.

Mohring, R.M.

Gueye, P.

Abbott, D.

Ahmidouch, A.

Amatuni, Ts.A.

Ambrozewicz, P.

Angelescu, T.

Armstrong, C.S.

Assamagan, K.

Avery, S.

Bailey, K.

Baker, O.K.

Beard, K.

Beedoe, S.

Beise, E.

Breuer, H.

Carlini, R.

Cha, J.

Chang, C.C.

Chant, N.

Cisbani, E.

Collins, G.

Cummings, W.

Danagoulian, S.

DeLeo, R.

Duncan, F.

Dunne, J.

Dutta, D.

Eden, T.

Ent, R.

Eyraud, L.

Ewell, L.

Finn, M.

Fortune, T.

Frolov, V.

Frullani, S.

Furget, C.

Garibaldi, F.

Gaskell, D.

Geesaman, D.F.

Gustafsson, K.K.

Hansen, J.-O.

Harvey, M.

Hinton, W.

Hungerford, E.

Iodice, M.

Jackson, C.

Keppel, C.

Kim, W.

Kino, K.

Koltenuk, D.

Kox, S.

Kramer, L.

Leone, T.

Lolos, G.

Lung, A.

Mack, D.

Madey, R.

Maeda, M.

Majewski, S.

Markowitz, P.

Martoff, C.J.

Meekins, D.

Mihul, A.

Mitchell, J.

Mkrtchyan, H.

Mtingwa, S.

Niculescu, I.

Perrino, R.

Potterveld, D.

Price, J.W.

Raue, B.A.

Real, J.-S.

Reinhold, J.

Roos, P.

Saito, T.

Savage, G.

Sawafta, R.

Segel, R.

Stepanyan, S.

Stoler, P.

Tadevosian, V.

Tang, L.

Teodorescu, L.

Terasawa, T.

Tsubota, H.

Urciuoli, G.M.

Volmer, J.

Vulcan, W.

Welch, P.

Williams, R.

Wood, S.

Yan, C.

Zeidman, B.

Citation

Niculsescu, G. et al. "Longitudinal and Transverse Cross Sections in the 1H(e,e′K+)Λ Reaction." Physical Review Letters 81, no. 9 (1998): 1805-1808.

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Abstract

The 1H(e,e′K+)Λ reaction was studied as a function of the squared four-momentum transfer, Q2, and the virtual photon polarization, ɛ. For each of four Q2 settings, 0.52, 0.75, 1.00, and 2.00 (GeV/c)2, the longitudinal and transverse virtual photon cross sections were extracted in measurements at three virtual photon polarizations. The Q2 dependence of the σL/σT ratio differs significantly from current theoretical predictions. This, combined with the precision of the measurement, implies a need for revision of existing calculations.