Exclusive Electroproduction Of Phi Mesons At 4.2 Gev

K. Lukashin,E. Smith,G. Adams,E. Anciant,M. Anghinolfi,B. Asavapibhop,G. Audit,T. Auger,H. Avakian,J. Ball,S. Barrow,M. Battaglieri,K. Beard,M. Bektasoglu,W. Bertozzi,N. Bianchi,A. Biselli,S. Boiarinov,B. Bonner,S. Bouchigny,D. Branford,W. Briscoe,W. Brooks,V. Burkert, J. Calarco,D. Carman,B. Carnahan,L. Ciciani,R. Clark,P. Cole,A. Coleman,D. Cords,P. Corvisiero,D. Crabb,H. Crannell,J. Cummings,P. Degtiarenko,L. Dennis,E. De Sanctis,R. DeVita,K. Dhuga,C. Djalali,G. Dodge,J. Domingo,D. Doughty,P. Dragovitsch,S. Dytman,M. Eckhause,H. Egiyan,K. Egiyan,L. Elouadrhiri,A. Empl,R. Fatemi,R. Feuerbach,J. Ficenec,K. Fissum,T. Forest,A. Freyberger,H. Funsten,S. Gaff,M. Gai,G. Gavalian,S. Gilad,G. Gilfoyle,K. Giovanetti,P. Girard,K. Griffioen,M. Guidal,M. Guillo,V. Gyurjyan,J. Hardie,D. Heddle,F. Hersman,K. Hicks,R. Hicks,M. Holtrop,J. Hu,C. Hyde-Wright,M. Ito,D. Jenkins,K. Joo,J. Kelley,M. Khandaker,K. Kim,W. Kim,A. Klein,F. Klein,M. Klusman, M. Kossov,L. Kramer,S. Kuhn,J. Laget,D. Lawrence,A. Longhi,J. Manak,C. Marchand,S. McAleer,J. McCarthy,J. McNabb,B. Mecking,M. Mestayer,C. Meyer,K. Mikhailov,R. Minehart,M. Mirazita,R. Miskimen,V. Muccifora,J. Mueller,G. Mutchler,J. Napolitano,S. Nelson,G. Niculescu,I. Niculescu,B. Niczyporuk,R. Niyazov,A. Opper,G. O’Rielly,J. O’Brien,K. Park,K. Paschke,E. Pasyuk,G. Peterson,S. Philips,N. Pivnyuk,D. Pocanic,O. Pogorelko,E. Polli,S. Pozdniakov,B. Preedom,J. Price,L. Qin,B. Raue,A. Reolon,G. Riccardi,G. Ricco,M. Ripani,B. Ritchie,F. Ronchetti,P. Rossi,D. Rowntree,P. Rubin,F. Sabatié,K. Sabourov,C. Salgado,V. Sapunenko,R. Schumacher,V. Serov,Y. Sharabian,J. Shaw,S. Simionatto,A. Skabelin,L. Smith,D. Sober,A. Stavinsky,S. Stepanyan,P. Stoler,I. Strakovsky,M. Taiuti,S. Taylor,D. Tedeschi,R. Thompson,M. Vineyard,A. Vlassov,K. Wang,H. Weller,L. Weinstein,R. Welsh,D. Weygand,S. Whisnant,E. Wolin,L. Yanik,A. Yegneswaran,J. Yun,J. Zhao,B. Zhang,Z. Zhou

PHYSICAL REVIEW C（2001）

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摘要

We studied the exclusive reaction ep --> e' p' phi using the phi -->K+ K- decay mode. The data were collected using a 4.2 GeV incident electron beam and the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility. Our experiment covers the range in Q(2) from 0.7 to 2.2 GeV2 and W from 2.0 to 2.6 GeV. Taken together with all previous data, we find a consistent picture of phi production on the proton. Our measurement shows the expected decrease of the t slope with the vector-meson formation time c Delta tau below 2 fm. At = 0.6 fm, we measure b(phi) = 2.27 +/- 0.42 GeV-2. The cross section dependence on W as W0.2 +/- 0.1 at Q(2), 1.3 GeV2 was determined by comparison with phi production at HERA after correcting for threshold effects. This is the same dependence as observed in photoproduction.

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exclusive electroproduction,display=inline><mmlmi>φ</mmlmi></mmlmath>mesons,of<mmlmath xmlnsmml=http//wwww3org/1998/math/mathml

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