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Search for Theta++ pentaquarks in the exclusive reaction gammap-->K+K-p |
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| Authors: | Kubarovsky V Battaglieri M De Vita R Goett J Guo L Mutchler G S Stoler P Weygand D P Ambrozewicz P Anghinolfi M Asryan G Avakian H Bagdasaryan H Baillie N Ball J P Baltzell N A Batourine V Bedlinskiy I Bellis M Benmouna N Berman B L Biselli A S Bouchigny S Boiarinov S Bradford R Branford D Briscoe W J Brooks W K Bültmann S Burkert V D Butuceanu C Calarco J R Careccia S L Carman D S Chen S Clinton E Cole P L Collins P Coltharp P Crabb D Crannell H Crede V Cummings J P De Masi R Dale D De Sanctis E Degtyarenko P V Deur A Dharmawardane K V Djalali C Dodge G E Donnelly J Doughty D Dugger M |
| Institution: | Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA. |
| Abstract: | The reaction gammap --> pK+K- was studied at Jefferson Lab with photon energies from 1.8 to 3.8 GeV using a tagged photon beam. The goal was to search for a Theta++ pentaquark, a narrow, doubly charged baryon state having strangeness S=+1 and isospin I=1, in the pK+ invariant mass spectrum. No statistically significant evidence of a Theta++ was found. Upper limits on the total and differential cross section for the reaction gammap --> K-Theta++ were obtained in the mass range from 1.5 to 2.0 GeV/c2, with an upper limit for a narrow resonance with a mass M(Theta++) = 1.54 GeV/c2 of about 0.15 nb, 95% C.L.. This result places a stringent upper limit on the Theta++ width Gamma(Theta++) <0.1 MeV/c2. |
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