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A Bayesian analysis of pentaquark signals from CLAS data

D.G. Ireland B. Mckinnon D. Protopopescu P. Ambrozewicz M. Anghinolfi G. Asryan H. Avakian H. Bagdasaryan N. Baillie J.P. Ball N.A. Baltzell V. Batourine M. Battaglieri I. Bedlinskiy M. Bellis N. Benmouna B.L. Berman A.S. Biselli L. Blaszczyk S. Bouchigny 1 S. Boiarinov R. Bradford D. Branford W.J. Briscoe W.K. Brooks V.D. Burkert C. Butuceanu J.R. Calarco S.L. Careccia D.S. Carman L. Casey S. Chen L. Cheng P.L. Cole P. Collins P. Coltharp D. Crabb V. Crede N. Dashyan R. de Masi 1, 2 R. de Vita E. de Sanctis P.V. Degtyarenko A. Deur R. Dickson C. Djalali G.E. Dodge J. Donnelly D. Doughty M. Dugger O.P. Dzyubak H. Egiyan K.S. Egiyan L. El Fassi L. Elouadrhiri P. Eugenio G. Fedotov G. Feldman A. Fradi 1 H. Funsten M. Garçon 2 G. Gavalian N. Gevorgyan G.P. Gilfoyle K.L. Giovanetti F.X. Girod 2 J.T. Goetz W. Gohn A. Gonenc R.W. Gothe K.A. Griffioen M. Guidal 1 N. Guler L. Guo V. Gyurjyan K. Hafidi H. Hakobyan C. Hanretty N. Hassall F.W. Hersman I. Hleiqawi M. Holtrop C.E. Hyde-Wright Y. Ilieva B.S. Ishkhanov E.L. Isupov D. Jenkins H.S. Jo 1 J.R. Johnstone K. Joo H.G. Juengst N. Kalantarians J.D. Kellie M. Khandaker W. Kim A. Klein F.J. Klein M. Kossov Z. Krahn L.H. Kramer V. Kubarovsky J. Kuhn S.V. Kuleshov V. Kuznetsov J. Lachniet J.M. Laget J. Langheinrich D. Lawrence K. Livingston H.Y. Lu M. Maccormick 1 N. Markov P. Mattione B.A. Mecking M.D. Mestayer C.A. Meyer T. Mibe K. Mikhailov M. Mirazita R. Miskimen V. Mokeev B. Moreno 1 K. Moriya S.A. Morrow 1, 2 M. Moteabbed E. Munevar G.S. Mutchler P. Nadel-Turonski 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 S. Anefalos Pereira J. Pierce N. Pivnyuk O. Pogorelko S. Pozdniakov J.W. Price S. Procureur 2 Y. Prok B.A. Raue G. Ricco M. Ripani B.G. Ritchie F. Ronchetti G. Rosner P. Rossi F. Sabatié 2 J. Salamanca C. Salgado J.P. Santoro V. Sapunenko R.A. Schumacher V.S. Serov Y.G. Sharabian D. Sharov N.V. Shvedunov E.S. Smith L.C. Smith D.I. Sober D. Sokhan A. Stavinsky S.S. Stepanyan S. Stepanyan B.E. Stokes P. Stoler S. Strauch M. Taiuti D.J. Tedeschi U. Thoma A. Tkabladze S. Tkachenko C. Tur M. Ungaro M.F. Vineyard A.V. Vlassov D.P. Watts L.B. Weinstein D.P. Weygand M. Williams E. Wolin M.H. Wood A. Yegneswaran L. Zana J. Zhang B. Zhao Z.W. Zhao
Abstract : We examine the results of two measurements by the CLAS collaboration, one of which claimed evidence for a $\Theta^{+}$ pentaquark, whilst the other found no such evidence. The unique feature of these two experiments was that they were performed with the same experimental setup. Using a Bayesian analysis we find that the results of the two experiments are in fact compatible with each other, but that the first measurement did not contain sufficient information to determine unambiguously the existence of a $\Theta^{+}$. Further, we suggest a means by which the existence of a new candidate particle can be tested in a rigorous manner.
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Submitted on : Friday, September 21, 2007 - 10:29:44 AM
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D.G. Ireland, B. Mckinnon, D. Protopopescu, P. Ambrozewicz, M. Anghinolfi, et al.. A Bayesian analysis of pentaquark signals from CLAS data. Physical Review Letters, American Physical Society, 2007, 100, pp.052001. ⟨10.1103/PhysRevLett.100.052001⟩. ⟨in2p3-00173955⟩

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