Bayesian analysis of pentaquark signals from CLAS data

We examine the results of two measurements by the CLAS collaboration, one of which claimed evidence for a Theta(+) pentaquark, while 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,...

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Veröffentlicht in:	Physical review letters 2008-02, Vol.100 (5), p.052001-052001, Article 052001
Hauptverfasser:	Ireland, D G, McKinnon, B, Protopopescu, D, Ambrozewicz, P, Anghinolfi, M, Asryan, G, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, J P, Baltzell, N A, Batourine, V, Battaglieri, M, Bedlinskiy, I, Bellis, M, Benmouna, N, Berman, B L, Biselli, A S, Blaszczyk, L, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Briscoe, W J, Brooks, W K, Burkert, V D, Butuceanu, C, Calarco, J R, Careccia, S L, Carman, D S, Casey, L, Chen, S, Cheng, L, Cole, P L, Collins, P, Coltharp, P, Crabb, D, Crede, V, Dashyan, N, De Masi, R, De Vita, R, De Sanctis, E, Degtyarenko, P V, Deur, A, Dickson, R, Djalali, C, Dodge, G E, Donnelly, J, Doughty, D, Dugger, M, Dzyubak, O P, Egiyan, K S, El Fassi, L, Elouadrhiri, L, Eugenio, P, Fedotov, G, Feldman, G, Fradi, A, Funsten, H, Garçon, M, Gavalian, G, Gevorgyan, N, Gilfoyle, G P, Giovanetti, K L, Girod, F X, Goetz, J T, Gohn, W, Gonenc, A, Gothe, R W, Griffioen, K A, Guidal, M, Guler, N, Guo, L, Gyurjyan, V, Hafidi, K, Hakobyan, H, Hanretty, C, Hassall, N, Hersman, F W, Hleiqawi, I, Holtrop, M, Hyde-Wright, C E, Ilieva, Y, Ishkhanov, B S, Isupov, E L, Jenkins, D, Jo, H S, Johnstone, J R, Joo, K, Juengst, H G, Kalantarians, N, Kellie, J D, Khandaker, M, Kim, W, Klein, A, Klein, F J, Kossov, M, Krahn, Z, Kramer, L H, Kubarovsky, V
Format:	Artikel
Sprache:	eng
Schlagworte:	DATA ANALYSIS High Energy Physics - Phenomenology PARTICLE IDENTIFICATION Physics PHYSICS OF ELEMENTARY PARTICLES AND FIELDS QUARKS SIGNALS TESTING
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Beschreibung
Zusammenfassung:	We examine the results of two measurements by the CLAS collaboration, one of which claimed evidence for a Theta(+) pentaquark, while 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.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.100.052001