Search for the Θ+ pentaquark in the γd→ΛnK+ reaction measured with the CLAS spectrometer

S. Niccolai,M. Mirazita,P. Rossi,N. A. Baltzell,Daniel S. Carman,K. Hicks,B. McKinnon,Tsutomu Mibe,S. Stepanyan,D. J. Tedeschi,G. S. Adams,P. Ambrozewicz,S. Anefalos Pereira,M. Anghinolfi,G. Asryan,H. Avakian,H. Bagdasaryan,N. Baillie,J. P. Ball,V. Batourine,M. Battaglieri,I. Bedlinskiy,M. Bektasoglu,M. Bellis,N. Benmouna,B. L. Berman,A. S. Biselli,S. Boiarinov,Sylvain Bouchigny,R. Bradford,D. Branford,W. J. Briscoe,W. K. Brooks,S. Bültmann,Volker D. Burkert,C. Butuceanu,J. R. Calarco,S. L. Careccia,B. Carnahan,Shifeng Chen,P. L. Cole,P. Collins,P. Coltharp,D. G. Crabb,Hall Crannell,V. Crede,J. P. Cummings,N. Dashyan,P. V. Degtyarenko,R. De Masi,Airton Deppman,E. De Sanctis,A. Deur,R. DeVita,K. V. Dharmawardane,C. Djalali,G. E. Dodge,J. Donnelly,D. Doughty,Michael Dugger,O. P. Dzyubak,Hovanes Egiyan,K. S. Egiyan,L. El Fassi,Latifa Elouadrhiri,P. Eugenio,G. V. Fedotov,Gerald Feldman,H. O. Funsten,M. Garçon,G. Gavalian,Gerard Gilfoyle,K. L. Giovanetti,F. X. Girod,J. T. Goetz,Atilla Gonenc,C. I O Gordon,R. W. Gothe,K. A. Griffioen,M. Guidal,N. Guler,L. Guo,V. Gyurjyan,Cynthia Marie Hadjidakis,K. Hafidi,H. Hakobyan,R. S. Hakobyan,J. Hardie,F. W. Hersman,I. Hleiqawi,M. Holtrop,C. E. Hyde-Wright,Y. Ilieva,D. G. Ireland

Physical Review Letters（2006）

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Abstract

For the first time, the reaction gamma d -> Lambda n K+ has been analyzed in order to search for the exotic pentaquark baryon Theta+(1540). The data were taken at Jefferson Lab, 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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the<mmlmath xmlnsmml=http//wwww3org/1998/math/mathml,display=inline><mmlmi>γ</mmlmi><mmlmi>d</mmlmi><mmlmo>→</mmlmo><mmlmi>λ</mmlmi><mmlmi>n</mmlmi><mmlmsup><mmlmi>k</mmlmi><mmlmo>+</mmlmo></mmlmsup></mmlmath>reaction

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