Search For The Theta(+) Pentaquark In The Gamma D ->Lambda Nk(+) Reaction Measured With The Clas Spectrometer

S. Niccolai,M. Mirazita,P. Rossi,N. Baltzell,D. Carman,K. Hicks,B. McKinnon,T. Mibe,S. Stepanyan,D. Tedeschi,G. Adams,P. Ambrozewicz,S. Anefalos Pereira,M. Anghinolfi,G. Asryan,H. Avakian,H. Bagdasaryan,N. Baillie,J. Ball,V. Batourine,M. Battaglieri,I. Bedlinskiy,M. Bektasoglu,M. Bellis,N. Benmouna,B. Berman,A. Biselli,S. Boiarinov,S. Bouchigny,R. Bradford,D. Branford,W. Briscoe,W. Brooks,S. Bültmann,V. Burkert,C. Butuceanu, J. Calarco,S. Careccia,B. Carnahan,S. Chen,P. Cole,P. Collins,P. Coltharp, D. Crabb,H. Crannell,V. Crede,J. Cummings,N. Dashyan,P. Degtyarenko,R. De Masi,A. Deppman,E. De Sanctis,A. Deur,R. DeVita,K. Dharmawardane,C. Djalali, G. Dodge,J. Donnelly,D. Doughty,M. Dugger,O. Dzyubak,H. Egiyan,K. Egiyan,L. El Fassi,L. Elouadrhiri,P. Eugenio,G. Fedotov,G. Feldman,H. Funsten,M. Garçon,G. Gavalian,G. Gilfoyle,K. Giovanetti,F. Girod,J. Goetz,A. Gonenc,C. Gordon,R. Gothe,K. Griffioen,M. Guidal,N. Guler,L. Guo,V. Gyurjyan, C. Hadjidakis,K. Hafidi, H. Hakobyan,R. Hakobyan,J. Hardie,F. Hersman,I. Hleiqawi,M. Holtrop,C. Hyde-Wright,Y. Ilieva,D. Ireland,B. Ishkhanov,E. Isupov,M. Ito,D. Jenkins,H. Jo,K. Joo,H. Juengst,J. Kellie,M. Khandaker,W. Kim,A. Klein,F. Klein,A. Klimenko, M. Kossov,L. Kramer,V. Kubarovsky,J. Kuhn,S. Kuhn,S. Kuleshov,J. Lachniet,J. Langheinrich,D. Lawrence,T. Lee,Ji Li, K. Livingston,H. Lu,M. MacCormick,N. Markov,B. Mecking,J. Mellor,J. Melone,M. Mestayer,C. Meyer,K. Mikhailov,R. Minehart,R. Miskimen,V. Mokeev,L. Morand,S. Morrow,M. Moteabbed,G. Mutchler,P. Nadel-Turonski,J. Napolitano,R. Nasseripour,G. Niculescu,I. Niculescu,B. Niczyporuk,M. Niroula,R. Niyazov,M. Nozar,J. de Oliveira Echeimberg,M. Osipenko,A. Ostrovidov, K. Park,E. Pasyuk,C. Paterson,J. Pierce,N. Pivnyuk,D. Pocanic,O. Pogorelko,S. Pozdniakov,B. Preedom,J. Price,Y. Prok,D. Protopopescu,B. Raue,G. Riccardi,G. Ricco,M. Ripani,B. Ritchie,F. Ronchetti,G. Rosner,F. Sabatié,C. Salgado,J. Santoro,V. Sapunenko,R. Schumacher,V. Serov,Y. Sharabian,N. Shvedunov,E. Smith,L. Smith, D. Sober,A. Stavinsky,S. Stepanyan,B. Stokes, P. Stoler,I. Strakovsky,S. Strauch,M. Taiuti,U. Thoma,A. Tkabladze,S. Tkachenko,L. Todor,C. Tur,M. Ungaro,M. Vineyard,A. Vlassov,D. Watts,L. Weinstein,D. Weygand,M. Williams,E. Wolin,M. Wood,A. Yegneswaran,L. Zana,J. Zhang,B. Zhao,Z. Zhao

PHYSICAL REVIEW LETTERS（2006）

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摘要

For the first time, the reaction gamma d ->Lambda nK(+) has been analyzed in order to search for the exotic pentaquark baryon Theta(+)(1540). The data were taken at Jefferson Laboratory, using the Hall-B tagged-photon beam of energy between 0.8 and 3.6 GeV and the CEBAF Large Acceptance Spectrometer (CLAS). No statistically significant structures were observed in the nK(+) invariant-mass distribution. The upper limit on the gamma d ->Lambda Theta(+) integrated cross section has been calculated and found to be between 5 and 25 nb, depending on the production model assumed. The upper limit on the differential cross section is also reported.

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