Observation of the B^+ → D^*-K^+π^+ decay
LHCb collaboration,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 Jr,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. Bozzi,S. Braun,T. Britton,J. Brodzicka,E. Buchanan,C. Burr,A. Bursche,J. Buytaert,S. Cadeddu,R. Calabrese,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, L. Carson,K. Carvalho Akiba,G. Casse,L. Cassina,L. Castillo Garcia,M. Cattaneo,G. Cavallero,R. Cenci,D. Chamont,M. Charles,Ph. Charpentier,G. Chatzikonstantinidis,M. Chefdeville,S. Chen,S. -F. Cheung,V. Chobanova,M. Chrzaszcz,A. Chubykin,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,P. Collins,A. Comerma-Montells,A. Contu,A. Cook,G. Coombs,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,F. Da Cunha Marinho,E. Dall'Occo,J. Dalseno,A. Davis,K. De Bruyn,S. De Capua,M. De Cian, J. M. De Miranda,L. De Paula,M. De Serio,P. De Simone, C. T. Dean,D. Decamp,M. Deckenhoff,L. Del Buono,H. -P. Dembinski,M. Demmer, A. 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,A. Gallas Torreira,D. Galli,S. Gallorini,S. Gambetta,M. Gandelman,P. Gandini,Y. Gao,L. M. Garcia Martin,J. 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Wilkinson,M. Williams,M. P. Williams,M. Williams,T. Williams,F. F. Wilson,J. Wimberley,M. A. Winn,J. Wishahi,W. Wislicki,M. Witek,G. Wormser,S. A. Wotton, K. Wraight,K. Wyllie,Y. Xie,Z. Xu,Z. Yang,Z. Yang,Y. Yao,H. Yin,J. Yu,X. Yuan, O. Yushchenko,K. A. Zarebski,M. Zavertyaev,L. Zhang,Y. Zhang,A. Zhelezov,Y. Zheng,X. Zhu,V. Zhukov,S. Zucchelli
PHYSICAL REVIEW D（2017）
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摘要
The B^+ → D^*-K^+π^+ decay potentially provides an excellent way to investigate charm meson spectroscopy. The decay is searched for in a sample of proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb^-1. A clear signal is observed, and the ratio of its branching fraction to that of the B^+ → D^*-π^+π^+ normalisation channel is measured to be ℬ(B^+ → D^*-K^+π^+)/ℬ(B^+ → D^*-π^+π^+) = ( 6.39 ± 0.27 ± 0.48 ) × 10^-2 , where the first uncertainty is statistical and the second is systematic. This is the first observation of the B^+ → D^*-K^+π^+ decay.
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