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Search for the Theta+ Pentaquark in the gammad--> DeltanK+ reaction measured with the CLAS spectrometer |
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| Authors: | Niccolai S Mirazita M Rossi P Baltzell N A Carman D S Hicks K McKinnon B Mibe T Stepanyan S Tedeschi D J Adams G Ambrozewicz P Anefalos Pereira S Anghinolfi M Asryan G Avakian H Bagdasaryan H Baillie N Ball J P Batourine V Battaglieri M Bedlinskiy I Bektasoglu M Bellis M Benmouna N Berman B L Biselli A S Boiarinov S Bouchigny S Bradford R Branford D Briscoe W J Brooks W K Bültmann S Burkert V D Butuceanu C Calarco J R Careccia S L Carnahan B Chen S Cole P L Collins P Coltharp P Crabb D Crannell H Crede V Cummings J P Dashyan N Degtyarenko P V De Masi R Deppman A De Sanctis E Deur A Devita R |
| Institution: | Institut de Physique Nucléaire, Orsay, France. |
| Abstract: | For the first time, the reaction gammad-->DeltanK+ 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 gammad-->DeltaTheta+ 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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