Observation of the Decays Λ_{b}^{0}→χ_{c1}pK^{-} and Λ_{b}^{0}→χ_{c2}pK^{-}.
R Aaij,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, F Archilli, P d'Argent,J Arnau Romeu, A Artamonov,M Artuso, E Aslanides, G Auriemma, M Baalouch,I Babuschkin,S Bachmann, J J Back, A Badalov, C Baesso,S Baker,V Balagura,W Baldini,A Baranov,R J Barlow, C Barschel, S Barsuk,W Barter,F Baryshnikov,M Baszczyk, V Batozskaya, V Battista, A Bay, L Beaucourt, J Beddow, F Bedeschi, I Bediaga, A Beiter, L J Bel, V Bellee, N Belloli,K Belous, I Belyaev, E Ben-Haim, G Bencivenni,S Benson,S Beranek,A Berezhnoy, R Bernet,A Bertolin,C Betancourt, F Betti,M-O Bettler,M van Beuzekom,Ia Bezshyiko, S Bifani,P Billoir, A Birnkraut, A Bitadze,A Bizzeti,T Blake,F Blanc,J Blouw,S Blusk,V Bocci, T Boettcher, A Bondar, N Bondar,W Bonivento,I Bordyuzhin, A Borgheresi,S Borghi, M Borisyak,M Borsato, F Bossu, M Boubdir,T J V Bowcock,E Bowen, C 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Dendek, D Derkach,O Deschamps, F Dettori,B Dey,A Di Canto,P Di Nezza, H Dijkstra, F Dordei,M Dorigo,A Dosil Suárez, A Dovbnya, K Dreimanis,L Dufour, G Dujany,K Dungs,P Durante,R Dzhelyadin, M Dziewiecki, A Dziurda, A Dzyuba, N Déléage,S Easo,M Ebert,U Egede,V Egorychev,S Eidelman,S Eisenhardt, U Eitschberger,R Ekelhof,L Eklund,S Ely,S Esen,H M Evans,T Evans, A Falabella, N Farley, S Farry,R Fay,D Fazzini,D Ferguson, G Fernandez,A Fernandez Prieto,F Ferrari,F Ferreira Rodrigues, M Ferro-Luzzi,S Filippov, R A Fini,M Fiore, M Fiorini,M Firlej, C Fitzpatrick,T Fiutowski,F Fleuret,K Fohl,M Fontana,F Fontanelli, D C Forshaw, R Forty,V Franco Lima,M Frank,C Frei,J Fu, W Funk, E Furfaro, C Färber,E Gabriel,A Gallas Torreira, D Galli,S Gallorini,S Gambetta, M Gandelman, P Gandini,Y Gao,L M Garcia Martin,J García Pardiñas,J Garra Tico, L Garrido,P J Garsed, D Gascon,C Gaspar, L Gavardi,G Gazzoni, D Gerick,E Gersabeck,M Gersabeck, T Gershon,Ph Ghez,S Gianì, V Gibson, O G Girard, L Giubega,K 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PHYSICAL REVIEW LETTERS（2017）
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摘要
The first observation of the decays Lambda(b)(0) -> chi(c1)pK(-) and Lambda(0)(b) -> chi(c2)pK(-) is reported using a data sample corresponding to an integrated luminosity of 3.0 fb(-1), collected by the LHCb experiment in pp collisions at center-of-mass energies of 7 and 8 TeV The following ratios of branching fractions are measured: B(Lambda(0)(b) -> chi(c1)pK(-))/B(Lambda(0)(b) -> J/psi pK(-)) = 0.242 +/- 0.014 +/- 0.013 +/- 0.009, B(Lambda(0)(b) -> chi(c2)pK(-))/B(Lambda(0)(b) -> J/psi pK(-)) = 0.248 +/- 0.020 +/- 0.014 +/- 0.009, B(Lambda(0)(b) -> chi(c2)pK(-))/B(Lambda(0)(b) -> chi(c1)pK(-)) = 1.02 +/- 0.010 +/- 0.02 +/- 0.05, where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty on the branching fractions of the x(c1) -> J/psi gamma and chi(c2) -> J/psi gamma decays. Using both decay modes, the mass of the Ab baryon is also measured to be m(Lambda b0) = 5619.44 +/- 0.28 +/- 0.26 MeV/c(2), where the first and second uncertainties are statistical and systematic, respectively.
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