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Search for $\Theta^{++}$ Pentaquarks in the Exclusive Reaction $\gamma p\to K^+K^-p$

V. Kubarovsky M. Battaglieri R. de Vita J. Goett L. Guo G. S. Mutchler P. Stoler D. P. Weygand P. Ambrozewicz M. Anghinolfi G. Asryan H. Avakian H. Bagdasaryan N. Baillie J. P. Ball N.A. Baltzell V. Batourine I. Bedlinskiy M. Bellis N. Benmouna B. L. Berman A. S. Biselli S. Bouchigny 1 S. Boiarinov R. Bradford D. Branford W. J. Briscoe W. K. Brooks S. Bültmann V. D. Burkert C. Butuceanu J. R. Calarco S. L. Careccia D. S. Carman S. Chen E. Clinton P. L. Cole P. Collins P. Coltharp D. Crabb H. Crannell V. Crede J. P. Cummings R. de Masi 2 D. Dale E. de Sanctis P. V. Degtyarenko A. Deur K. V. Dharmawardane C. Djalali G. E. Dodge J. Donnelly D. Doughty M. Dugger O. P. Dzyubak H. Egiyan K. S. Egiyan L. Elouadrhiri P. Eugenio G. Fedotov H. Funsten M. Y. Gabrielyan L. Gan M. Garçon 2 A. Gasparian G. Gavalian G. P. Gilfoyle K. L. Giovanetti F.X. Girod 2 O. Glamazdin J. T. Goetz E. Golovach A. Gonenc C. I. O. Gordon R. W. Gothe K. A. Griffioen M. Guidal 1 N. Guler V. Gyurjyan C. Hadjidakis 1 K. Hafidi R. S. Hakobyan J. Hardie F. W. Hersman K. Hicks I. Hleiqawi M. Holtrop C. E. Hyde-Wright Y. Ilieva D. G. Ireland B. S. Ishkhanov E. L. Isupov M. M. Ito D. Jenkins H.S. Jo 1 K. Joo H. G. Juengst J. D. Kellie M. Khandaker W. Kim A. Klein F. J. Klein A. V. Klimenko M. Kossov L. H. Kramer J. Kuhn S. E. Kuhn S. V. Kuleshov J. Lachniet J.M. Laget 2 J. Langheinrich D. Lawrence T. Lee Ji Li K. Livingston H. Lu M. Maccormick 1 N. Markov B. Mckinnon B. A. Mecking J.J. Melone M. D. Mestayer C.A. Meyer T. Mibe K. Mikhailov R. Minehart M. Mirazita R. Miskimen V. Mochalov V. Mokeev L. Morand 2 S.A. Morrow 1, 2 M. Moteabbed P. Nadel-Turonski I. Nakagawa R. Nasseripour S. Niccolai 1 G. Niculescu I. Niculescu B. B. Niczyporuk M. R. Niroula R. A. Niyazov M. Nozar M. Osipenko A. I. Ostrovidov K. Park E. Pasyuk C. Paterson J. Pierce N. Pivnyuk D. Pocanic O. Pogorelko S. Pozdniakov J. W. Price Y. Prok D. Protopopescu B. A. Raue G. Riccardi G. Ricco M. Ripani B. G. Ritchie F. Ronchetti G. Rosner P. Rossi F. Sabatié 2 C. Salgado J. P. Santoro V. Sapunenko R. A. Schumacher V. S. Serov Y. G. Sharabian N. V. Shvedunov E. S. Smith L. C. Smith D. I. Sober A. Stavinsky S.S. Stepanyan S. Stepanyan B. E. Stokes I. I. Strakovsky S. Strauch M. Taiuti D. J. Tedeschi A. Teymurazyan U. Thoma A. Tkabladze S. Tkachenko L. Todor C. Tur M. Ungaro M. F. Vineyard A. V. Vlassov L. B. Weinstein M. Williams E. Wolin M. H. Wood A. Yegneswaran L. Zana J. Zhang B. Zhao
Abstract : The reaction $\gamma p \to pK^+K^-$ 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 production cross section for the reaction $\gamma p \to K^-\Theta^{++}$ were obtained in the mass range from 1.5 to 2.0 GeV/c$^2$, with an upper limit of about 0.15 nb, 95% C.L. for a narrow resonance with a mass $M_{\Theta^{++}}=1.54$ GeV/c$^2$. This result places a very stringent upper limit on the $\Theta^{++}$ width.
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Submitted on : Wednesday, October 11, 2006 - 9:40:32 AM
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V. Kubarovsky, M. Battaglieri, R. de Vita, J. Goett, L. Guo, et al.. Search for $\Theta^{++}$ Pentaquarks in the Exclusive Reaction $\gamma p\to K^+K^-p$. Physical Review Letters, American Physical Society, 2006, 97, pp.102001. ⟨10.1103/PhysRevLett.97.102001⟩. ⟨in2p3-00105418⟩

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