Evidence for Exotic Hadron Contributions to Λ_{b}^{0}→J/ψpπ^{-} Decays.
R Aaij,C Abellán Beteta, B Adeva, M Adinolfi, Z Ajaltouni,S Akar, J Albrecht, F Alessio,M Alexander,S Ali, G Alkhazov,P Alvarez Cartelle, A A Alves, S Amato, S Amerio, Y Amhis, L An,L Anderlini, G Andreassi, M Andreotti, J E Andrews, R B Appleby,O Aquines Gutierrez, F Archilli, P d'Argent,J Arnau Romeu, A Artamonov, M Artuso, E Aslanides, G Auriemma,M Baalouch, S Bachmann, J J Back, A Badalov, C Baesso, W Baldini, R J Barlow,C Barschel, S Barsuk, W Barter, V Batozskaya, V Battista, A Bay, L Beaucourt, J Beddow, F Bedeschi, I Bediaga, L J Bel, V Bellee, N Belloli, K Belous, I Belyaev, E Ben-Haim, G Bencivenni, S Benson, J Benton, A Berezhnoy, R Bernet, A Bertolin,M-O Bettler,M van Beuzekom, S Bifani, P Billoir, T Bird, A Birnkraut, A Bitadze, A Bizzeti, T Blake,F Blanc, J Blouw, S Blusk, V Bocci, T Boettcher, A Bondar, N Bondar, W Bonivento, S Borghi,M Borisyak,M Borsato, F Bossu,M Boubdir, T J V Bowcock, E Bowen, C Bozzi, S Braun, M Britsch, T Britton, J Brodzicka, E Buchanan, C Burr, A Bursche, J Buytaert, S Cadeddu, R Calabrese, M Calvi, M Calvo Gomez, P Campana,D Campora Perez, L Capriotti,A Carbone,G Carboni, R Cardinale, A Cardini, P Carniti, L Carson, K Carvalho Akiba, G Casse, L Cassina,L Castillo Garcia,M Cattaneo,Ch Cauet, G Cavallero, R Cenci,M Charles,Ph Charpentier, G Chatzikonstantinidis, M Chefdeville,S Chen,S-F Cheung,V Chobanova, M Chrzaszcz, X Cid Vidal, G Ciezarek, P E L Clarke, M Clemencic, H V Cliff, J Closier, V Coco,J Cogan, E Cogneras, V Cogoni,L Cojocariu,G Collazuol,P Collins, A Comerma-Montells,A Contu, A Cook, S Coquereau, G Corti,M Corvo,C M Costa Sobral, B Couturier,G A Cowan, D C Craik, A Crocombe,M Cruz Torres, S Cunliffe, R Currie, C D'Ambrosio,E Dall'Occo, J Dalseno, P N Y David,A Davis,O De Aguiar Francisco, K De Bruyn,S De Capua,M De Cian,J M De Miranda, L De Paula, P De Simone,C-T Dean, D Decamp, M Deckenhoff, L Del Buono, M Demmer, D Derkach, O Deschamps, F Dettori,B Dey, A Di Canto, H Dijkstra, F Dordei, M Dorigo,A Dosil Suárez, 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PHYSICAL REVIEW LETTERS（2016）
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摘要
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.
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