Search for Theta++ pentaquarks in the exclusive reaction gammap-->K+K-p

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 st...

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Published in:Physical review letters 2006-09, Vol.97 (10), p.102001-102001
Main 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, Dzyubak, O P, Egiyan, H, Egiyan, K S, Elouadrhiri, L, Eugenio, P, Fedotov, G, Funsten, H, Gabrielyan, M Y, Gan, L, Garçon, M, Gasparian, A, Gavalian, G, Gilfoyle, G P, Giovanetti, K L, Girod, F X, Glamazdin, O, Goetz, J T, Golovach, E, Gonenc, A, Gordon, C I O, Gothe, R W, Griffioen, K A, Guidal, M, Guler, N, Gyurjyan, V, Hadjidakis, C, Hafidi, K, Hakobyan, R S, Hardie, J, Hersman, F W, Hicks, K, Hleiqawi, I, Holtrop, M, Hyde-Wright, C E, Ilieva, Y, Ireland, D G, Ishkhanov, B S, Isupov, E L, Ito, M M, Jenkins, D, Jo, H S, Joo, K, Juengst, H G, Kellie, J D, Khandaker, M, Kim, W
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Language:English
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Summary: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++)
ISSN:0031-9007