Observation of a Narrow Pentaquark State, P-c(4312)(+), and of the Two-Peak Structure of the P-c(4450)(+)
R. Aaij,C. Abellan Beteta,B. Adeva,M. Adinolfi, C. A. Aidala, Z. Ajaltouni,S. Akar,P. Albicocco, J. Albrecht, F. Alessio, M. Alexander,A. Alfonso Albero, G. Alkhazov,P. Alvarez Cartelle,Jr. Alves A. A.,S. Amato, Y. Amhis, L. An, L. Anderlini, G. Andreassi, M. Andreotti,J. E. Andrews,F. Archilli,P. d'Argent,J. Arnau Romeu, A. Artamonov,M. Artuso, K. Arzymatov, E. Aslanides,M. Atzeni, B. Audurier,S. Bachmann, J. J. Back, S. Baker,V. Balagura,W. Baldini,A. Baranov, R. J. Barlow, S. Barsuk,W. Barter,M. Bartolini,F. Baryshnikov, V. Batozskaya, B. Batsukh, A. Battig, V. Battista, A. Bay, F. Bedeschi, I. Bediaga, A. Beiter, L. J. Bel,V. Belavin,S. Belin,N. Beliy, V. Bellee, N. Belloli, K. Belous, I. Belyaev, E. Ben-Haim, G. Bencivenni, S. Benson,S. Beranek, A. Berezhnoy, R. Bernet, D. Berninghoff, E. Bertholet, A. Bertolin,C. Betancourt, F. Betti,M. O. Bettler,M. van Beuzekom,Ia. Bezshyiko,S. Bhasin, J. Bhom,M. S. Bieker,S. Bifani, P. Billoir, A. Birnkraut, A. Bizzeti,M. Bjorn,M. P. Blago,T. Blake,F. Blanc,S. Blusk, D. Bobulska,V. Bocci,O. Boente Garcia,T. Boettcher,A. Bondar, N. Bondar, S. Borghi,M. Borisyak,M. Borsato, M. Boubdir,T. J. V. Bowcock,C. Bozzi,S. Braun,A. Brea Rodriguez,M. Brodski, J. Brodzicka,A. Brossa Gonzalo, D. Brundu, E. Buchanan, A. Buonaura,C. Burr, A. Bursche,J. S. Butter, J. Buytaert,W. Byczynski,S. Cadeddu,H. Cai,R. Calabrese, S. Cali, R. Calladine, M. Calvi,M. Calvo Gomez, A. Camboni,P. Campana,D. H. Campora Perez,L. Capriotti,A. Carbone,G. Carboni,R. Cardinale, A. Cardini,P. Carniti,K. Carvalho Akiba,A. Casais Vidal, G. Casse,M. Cattaneo, G. Cavallero, R. Cenci,M. G. Chapman,M. Charles,Ph. Charpentier,G. Chatzikonstantinidis, M. Chefdeville, V. Chekalina,C. Chen,S. Chen,S. -G. Chitic,V. Chobanova, M. Chrzaszcz, A. Chubykin, P. Ciambrone,X. Cid Vidal, G. Ciezarek, F. Cindolo, P. E. L. Clarke, M. Clemencic, H. V. Cliff, J. Closier,V. Coco,J. A. B. Coelho,J. Cogan, E. Cogneras, L. Cojocariu,P. Collins, T. Colombo, A. Comerma-Montells, A. Contu,G. 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Wang,M. Wang,Y. Wang,Z. Wang, D. R. Ward,H. M. Wark,N. K. Watson,D. Websdale, A. Weiden,C. Weisser,M. Whitehead,G. Wilkinson,M. Wilkinson,I. Williams,M. R. J. Williams,M. Williams,T. Williams,F. F. Wilson, M. Winn,W. Wislicki,M. Witek,G. Wormser,S. A. Wotton,K. Wyllie, D. Xiao,Y. Xie,H. Xing,A. Xu,L. Xu,M. Xu,Q. Xu,Z. Xu,Z. Yang,Y. Yao,E. Yeomans, H. Yin,J. Yu,X. Yuan,O. Yushchenko,K. A. Zarebski,M. Zavertyaev,M. Zeng,D. Zhang,L. Zhang,S. Zhang,W. C. Zhang,Y. Zhang,A. Zhelezov,Y. Zheng,X. Zhu,V. Zhukov,J. B. Zonneveld,S. Zucchelli
arxiv（2019）
引用 553|浏览17
摘要
A narrow pentaquark state, P-c(4312)(+), decaying to J/psi p, is discovered with a statistical significance of 7.3 sigma in a data sample of Lambda(0)(b) -> J/psi pK(-) decays, which is an order of magnitude larger than that previously analyzed by the LHCb Collaboration. The P-c(4450)(+) pentaquark structure formerly reported by LHCb is confirmed and observed to consist of two narrow overlapping peaks, P-c(4440)(+) and P-c(4457)(+), where the statistical significance of this two-peak interpretation is 5.4 sigma. The proximity of the Sigma(+)(c)(D) over bar (0) and Sigma(+)(c)(D) over bar (*0) thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states.
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