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Evidence for Exotic Hadron Contributions to Λ_{b}^{0}→J/ψpπ^{-} Decays

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Title: Evidence for Exotic Hadron Contributions to Λ_{b}^{0}→J/ψpπ^{-} Decays
Authors: Aaij, R
Abellán Beteta, C
Adeva, B
Adinolfi, M
Ajaltouni, Z
Akar, S
Albrecht, J
Alessio, F
Alexander, M
Ali, S
Alkhazov, G
Alvarez Cartelle, P
Alves, AA
Amato, S
Amerio, S
Amhis, Y
An, L
Anderlini, L
Andreassi, G
Andreotti, M
Andrews, JE
Appleby, RB
Aquines Gutierrez, O
Archilli, F
D'Argent, P
Arnau Romeu, J
Artamonov, A
Artuso, M
Aslanides, E
Auriemma, G
Baalouch, M
Bachmann, S
Back, JJ
Badalov, A
Baesso, C
Baldini, W
Barlow, RJ
Barschel, C
Barsuk, S
Barter, W
Batozskaya, V
Battista, V
Bay, A
Beaucourt, L
Beddow, J
Bedeschi, F
Bediaga, I
Bel, LJ
Bellee, V
Belloli, N
Belous, K
Belyaev, I
Ben-Haim, E
Bencivenni, G
Benson, S
Benton, J
Berezhnoy, A
Bernet, R
Bertolin, A
Bettler, MO
Van Beuzekom, M
Bifani, S
Billoir, P
Bird, T
Birnkraut, A
Bitadze, A
Bizzeti, A
Blake, T
Blanc, F
Blouw, J
Blusk, S
Bocci, V
Boettcher, T
Bondar, A
Bondar, N
Bonivento, W
Borghi, S
Borisyak, M
Borsato, M
Bossu, F
Boubdir, M
Bowcock, TJ
Bowen, E
Bozzi, C
Braun, S
Britsch, M
Britton, T
Brodzicka, J
Buchanan, E
Burr, C
Bursche, A
Buytaert, J
Cadeddu, S
Calabrese, R
Calvi, M
Calvo Gomez, M
Campana, P
Campora Perez, D
Capriotti, L
Carbone, A
Carboni, G
Cardinale, R
Cardini, A
Carniti, P
Carson, L
Carvalho Akiba, K
Casse, G
Cassina, L
Castillo Garcia, L
Cattaneo, M
Cauet, C
Cavallero, G
Cenci, R
Charles, M
Charpentier, P
Chatzikonstantinidis, G
Chefdeville, M
Chen, S
Cheung, SF
Chobanova, V
Chrzaszcz, M
Cid Vidal, X
Ciezarek, G
Clarke, PE
Clemencic, M
Cliff, HV
Closier, J
Coco, V
Cogan, J
Cogneras, E
Cogoni, V
Cojocariu, L
Collazuol, G
Collins, P
Comerma-Montells, A
Contu, A
Cook, A
Coquereau, S
Corti, G
Corvo, M
Costa Sobral, CM
Couturier, B
Cowan, GA
Craik, DC
Crocombe, A
Cruz Torres, M
Cunliffe, S
Currie, R
D'Ambrosio, C
Dall'Occo, E
Dalseno, J
David, PN
Davis, A
De Aguiar Francisco, O
De Bruyn, K
De Capua, S
De Cian, M
De Miranda, JM
De Paula, L
De Simone, P
Dean, CT
Decamp, D
Deckenhoff, M
Del Buono, L
Demmer, M
Derkach, D
Deschamps, O
Dettori, F
Dey, B
Di Canto, A
Dijkstra, H
Dordei, F
Dorigo, M
Dosil Suárez, A
Dovbnya, A
Dreimanis, K
Dufour, L
Dujany, G
Dungs, K
Durante, P
Dzhelyadin, R
Dziurda, A
Dzyuba, A
Déléage, N
Easo, S
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Egorychev, V
Eidelman, S
Eisenhardt, S
Eitschberger, U
Ekelhof, R
Eklund, L
Elsasser, C
Ely, S
Esen, S
Evans, HM
Evans, T
Falabella, A
Farley, N
Farry, S
Fay, R
Ferguson, D
Fernandez Albor, V
Ferrari, F
Ferreira Rodrigues, F
Ferro-Luzzi, M
Filippov, S
Fiore, M
Fiorini, M
Firlej, M
Fitzpatrick, C
Fiutowski, T
Fleuret, F
Fohl, K
Fontana, M
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Forty, R
Frank, M
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Gallas Torreira, A
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Gambetta, S
Gandelman, M
Gandini, P
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García Pardiñas, J
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Garrido, L
Garsed, PJ
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Gavardi, L
Gazzoni, G
Gerick, D
Gersabeck, E
Gersabeck, M
Gershon, T
Ghez, P
Gianì, S
Gibson, V
Girard, OG
Giubega, L
Gizdov, K
Gligorov, VV
Golubkov, D
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Gomes, A
Gorelov, IV
Gotti, C
Grabalosa Gándara, M
Graciani Diaz, R
Granado Cardoso, LA
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Graverini, E
Graziani, G
Grecu, A
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Grillo, L
Gruberg Cazon, BR
Grünberg, O
Gushchin, E
Guz, Y
Gys, T
Göbel, C
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Hansmann-Menzemer, S
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Kenyon, IR
Kenzie, M
Ketel, T
Khairullin, E
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Komarov, I
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LHCb Collaboration
Item Type: Journal Article
Abstract: A full amplitude analysis of Λ_{b}^{0}→J/ψpπ^{-} decays is performed with a data sample acquired with the LHCb detector from 7 and 8 TeV pp collisions, corresponding to an integrated luminosity of 3  fb^{-1}. A significantly better description of the data is achieved when, in addition to the previously observed nucleon excitations N→pπ^{-}, either the P_{c}(4380)^{+} and P_{c}(4450)^{+}→J/ψp states, previously observed in Λ_{b}^{0}→J/ψpK^{-} decays, or the Z_{c}(4200)^{-}→J/ψπ^{-} state, previously reported in B^{0}→J/ψK^{+}π^{-} decays, or all three, are included in the amplitude models. The data support a model containing all three exotic states, with a significance of more than three standard deviations. Within uncertainties, the data are consistent with the P_{c}(4380)^{+} and P_{c}(4450)^{+} production rates expected from their previous observation taking account of Cabibbo suppression.
Issue Date: 18-Aug-2016
Date of Acceptance: 22-Jun-2016
URI: http://hdl.handle.net/10044/1/39847
DOI: http://dx.doi.org/10.1103/PhysRevLett.117.082003
ISSN: 1079-7114
Publisher: American Physical Society
Journal / Book Title: Physical Review Letters
Volume: 117
Issue: 8
Copyright Statement: © 2016 CERN, for the LHCb Collaboration. This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Keywords: hep-ex
General Physics
02 Physical Sciences
Publication Status: Published
Open Access location: http://dx.doi.org/10.1103/PhysRevLett.117.082003
Article Number: 082003
Appears in Collections:Physics
High Energy Physics



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