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, 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.
Ireland
D G
DG
University of Glasgow, Glasgow G12 8QQ, United Kingdom.
McKinnon
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Protopopescu
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Ambrozewicz
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Anghinolfi
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Asryan
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Avakian
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Bagdasaryan
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H
Baillie
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N
Ball
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JP
Baltzell
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Batourine
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Battaglieri
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Bedlinskiy
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I
Bellis
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M
Benmouna
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Berman
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Biselli
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Blaszczyk
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L
Bouchigny
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S
Boiarinov
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S
Bradford
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Branford
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Briscoe
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Brooks
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Burkert
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Butuceanu
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Calarco
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Careccia
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Carman
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Casey
L
L
Chen
S
S
Cheng
L
L
Cole
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Collins
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P
Coltharp
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P
Crabb
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D
Crede
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Dashyan
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De Masi
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R
De Vita
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R
De Sanctis
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E
Degtyarenko
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Deur
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Dickson
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Djalali
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Dodge
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Donnelly
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Doughty
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Dugger
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Dzyubak
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Egiyan
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El Fassi
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Elouadrhiri
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Eugenio
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Fedotov
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Feldman
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Fradi
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Funsten
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Garçon
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Gavalian
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Gevorgyan
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N
Gilfoyle
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Giovanetti
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Girod
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Goetz
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Gohn
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Gonenc
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Gothe
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Griffioen
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Guidal
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Guler
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Guo
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Gyurjyan
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Hafidi
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Hakobyan
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H
Hanretty
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Hassall
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Hersman
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Hleiqawi
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Holtrop
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Hyde-Wright
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Ilieva
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Ishkhanov
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Isupov
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Jenkins
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D
Jo
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Johnstone
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Joo
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Juengst
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Kalantarians
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Kellie
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Khandaker
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Kim
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Klein
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Klein
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Kossov
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M
Krahn
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Z
Kramer
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Kubarovsky
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V
Kuhn
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Kuleshov
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Kuznetsov
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V
Lachniet
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J
Laget
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JM
Langheinrich
J
J
Lawrence
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D
Livingston
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K
Lu
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Maccormick
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M
Markov
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Mattione
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Mecking
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Mestayer
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Meyer
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Mibe
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Mikhailov
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Mirazita
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Miskimen
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Mokeev
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Moreno
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Moriya
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Morrow
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Moteabbed
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Munevar
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Mutchler
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Nadel-Turonski
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Nasseripour
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Niccolai
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Niculescu
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Niculescu
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Niczyporuk
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Niroula
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Niyazov
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Nozar
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M
Osipenko
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Ostrovidov
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Park
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Pasyuk
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Paterson
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Pereira
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SA
Pierce
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J
Pivnyuk
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Pogorelko
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Pozdniakov
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Price
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Procureur
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Prok
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Raue
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Ricco
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Ripani
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Ritchie
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Ronchetti
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Rosner
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Rossi
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Sabatié
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Salamanca
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Salgado
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Santoro
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Sapunenko
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Schumacher
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Serov
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Sharabian
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Sharov
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Shvedunov
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Smith
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Sober
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Stavinsky
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Stepanyan
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Stepanyan
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Stokes
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Stoler
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Strauch
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Taiuti
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Tedeschi
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Tkachenko
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Tur
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Ungaro
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Vineyard
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Vlassov
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Watts
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Weinstein
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Weygand
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Williams
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Wolin
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Wood
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Yegneswaran
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Zana
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Zhang
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Zhao
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Zhao
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