Observation Of The Lambda(0)(B) -> Lambda+Ck+K-Pi(-) Decay
R. Aaij,C. Abellan Beteta, T. Ackernley, B. Adeva,M. Adinolfi, H. Afsharnia, C. A. Aidala,S. Aiola, Z. Ajaltouni,S. Akar,J. Albrecht, F. Alessio, M. Alexander,A. Alfonso Albero, Z. Aliouche, G. Alkhazov,P. Alvarez Cartelle,S. Amato, Y. Amhis, L. An,L. Anderlini, A. Andreianov, M. Andreotti,F. Archilli,A. Artamonov,M. Artuso, K. Arzymatov, E. Aslanides,M. Atzeni, B. Audurier,S. Bachmann,M. Bachmayer, J. J. Back, S. Baker,P. Baladron Rodriguez,V Balagura,W. Baldini,J. Baptista Leite,R. J. Barlow, S. Barsuk,W. Barter,M. Bartolini,F. Baryshnikov, J. M. Basels, G. Bassi, B. Batsukh, A. Battig, A. Bay,M. Becker, F. Bedeschi, I Bediaga, A. Beiter, V Belavin,S. Belin, V Bellee, K. Belous, I Belov, I Belyaev, G. Bencivenni,E. Ben Haim,A. Berezhnoy, R. Bernet, D. Berninghoff, H. C. Bernstein, C. Bertella, E. Bertholet, A. Bertolin,C. Betancourt, F. Betti,M. O. Bettler,Ia Bezshyiko,S. Bhasin, J. Bhom,L. Bian,M. S. Bieker,S. Bifani, P. Billoir, M. Birch, F. C. R. Bishop, A. Bizzeti,M. Bjorn,M. P. Blago,T. Blake,F. Blanc,S. Blusk, D. Bobulska, J. A. Boelhauve,O. Boente Garcia, T. Boettcher, A. Boldyrev,A. Bondar, N. Bondar, S. Borghi, M. Borisyak, M. Borsato,J. T. Borsuk, S. A. Bouchiba,T. J. Bowcock,A. Boyer,C. Bozzi,M. J. Bradley,S. Braun,A. Brea Rodriguez, M. Brodski, J. Brodzicka,A. Brossa Gonzalo,D. Brundu, A. Buonaura,C. Burr, A. Bursche,A. Butkevich,J. S. Butter, J. Buytaert,W. Byczynski,S. Cadeddu,H. Cai,R. Calabrese, L. Calefice,L. Calero Diaz, S. Cali, R. Calladine, M. Calvi,M. Calvo Gomez,P. Camargo Magalhaes, A. Camboni,P. Campana,D. H. Campora Perez,A. F. Campoverde Quezada,S. Capelli,L. Capriotti,A. Carbone, G. Carboni, R. Cardinale, A. Cardini, I Carli, P. Carniti, L. Carus,K. Carvalho Akiba,A. Casais Vidal,G. Casse,M. Cattaneo,G. Cavallero, S. Celani,J. Cerasoli, A. J. Chadwick,M. G. Chapman,M. Charles,Ph Charpentier,G. Chatzikonstantinidis,C. A. Chavez Barajas, M. Chefdeville,C. Chen,S. Chen,A. Chernov,S-G Chitic,V Chobanova, S. Cholak, M. Chrzaszcz, A. 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PHYSICS LETTERS B（2021）
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摘要
The Lambda(0)(b) -> Lambda+cK+K-pi(-) decay is observed for the first time using a data sample of proton-proton collisions at centre-of-mass energies of root s = 7 and 8 TeV collected by the LHCb detector, corresponding to an integrated luminosity of 3fb(-1). The ratio of branching fractions between the Lambda(0)(b) -> Lambda K-+(c)+ K-pi(-) and the Lambda(0)(b) -> Lambda D-+(c)s(-) decays is measured to beB(Lambda(0)(b) -> Lambda+cK+K-pi(-))/B(Lambda(0)(b) -> Lambda D-+(c)s(-)) = (9.26 +/- 0.29 +/- 0.46 +/- 0.26) x 10(-2),where the first uncertainty is statistical, the second systematic and the third is due to the knowledge of the D-s(-) -> K+K-pi(-) branching fraction. No structure on the invariant mass distribution of the Lambda K-+(c)+ system is found, consistent with no open-charm pentaquark signature. (c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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