Phys. Rev. Lett.
81,
1805–1808
(1998)
Longitudinal and Transverse Cross Sections in the 1H(e,e′K+)Λ Reaction
G. Niculescu et al.
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G. Niculescu1, R. M. Mohring2, P. Gueye1, D. Abbott3, A. Ahmidouch1,4, Ts. A. Amatuni5, P. Ambrozewicz6, T. Angelescu7, C. S. Armstrong8, K. Assamagan1, S. Avery1, K. Bailey9, O. K. Baker1,3, K. Beard1, S. Beedoe10, E. Beise2, H. Breuer2, R. Carlini3, J. Cha1, C. C. Chang2, N. Chant2, E. Cisbani12, G. Collins2, W. Cummings9, S. Danagoulian10, R. De Leo12, F. Duncan2, J. Dunne3, D. Dutta13, T. Eden1, R. Ent3, L. Eyraud14, L. Ewell2, M. Finn8, T. Fortune15, V. Frolov16, S. Frullani12, C. Furget14, F. Garibaldi12, D. Gaskell17, D. F. Geesaman9, K. K. Gustafsson2, J.-O. Hansen9, M. Harvey1, W. Hinton1, E. Hungerford18, M. Iodice12, C. Jackson10, C. Keppel1,3, W. Kim19, K. Kino20, D. Koltenuk15, S. Kox14, L. Kramer21, T. Leone12, G. Lolos12, A. Lung2, D. Mack3, R. Madey1,4, M. Maeda20, S. Majewski3, P. Markowitz21, C. J. Martoff6, D. Meekins8, A. Mihul7, J. Mitchell3, H. Mkrtchyan5, S. Mtingwa10, I. Niculescu1, R. Perrino12, D. Potterveld9, J. W. Price16, B. A. Raue21, J.-S. Real14, J. Reinhold9, P. Roos2, T. Saito20, G. Savage1, R. Sawafta10, R. Segel13, S. Stepanyan5, P. Stoler16, V. Tadevosian5, L. Tang1,3, L. Teodorescu7, T. Terasawa20, H. Tsubota20, G. M. Urciuoli12, J. Volmer11, W. Vulcan3, P. Welch17, R. Williams1, S. Wood3, C. Yan3, and B. Zeidman9
1Hampton University, Hampton, Virginia 23668
2University of Maryland, College Park, Maryland 20742
3Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606
4Kent State University, Kent, Ohio 44242
5Yerevan Physics Institute, Yerevan, Armenia 375306
6Temple University, Philadelphia, Pennsylvania 19122
7Bucharest University, Bucharest, Romania R76900
8College of William and Mary, Williamsburg, Virginia 23187
9Argonne National Laboratory, Argonne, Illinois 60439
10North Carolina A & T State University, Greensboro, North Carolina 27411
11Free University, Amsterdam, The Netherlands 1081
12Physics Laboratory, Istituto Superiore di Sanitá and INFN-Sezione Sanitá, Rome, Italy I-00161
13Northwestern University, Evanston, Illinois 60201
14ISN, Grenoble, France 38026
15University of Pennsylvania, Philadelphia, Pennsylvania 19104
16Rensselaer Polytechnic Institute, Troy, New York 12180
17Oregon State University, Corvallis, Oregon 97331
18University of Houston, Houston, Texas 77204
19Kyungpook National University, Taegu, Republic of Korea
20Tohoku University, Sendai 982, Japan
21Florida International University, Miami, Florida 33199
Received 27 March 1998; published in the issue dated 31 August 1998
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.
© 1998 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.1805
DOI:
10.1103/PhysRevLett.81.1805
PACS:
25.30.Rw, 13.40.Gp, 14.40.Aq
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