Evidence for the decay B_s^0 --> D_s^(*)D_s^(*) and a measurement of Delta_Gamma_s^CP/Gamma_s
V.M. Abazov, B. Abbott, M. Abolins,B.S. Acharya,M. Adams,T. Adams, E. Aguilo, M. Ahsan,G.D. Alexeev, G. Alkhazov, A. Alton, G. Alverson,G.A. Alves, M. Anastasoaie, L.S. Ancu, T. Andeen, B. Andrieu, M.S. Anzelc,M. Aoki, Y. Arnoud, M. Arov,M. Arthaud, A. Askew, B. Asman,A.C.S. Assis Jesus, O. Atramentov, C. Avila, F. Badaud, L. Bagby, B. Baldin, D.V. Bandurin,P. Banerjee, S. Banerjee, E. Barberis, A.-F. Barfuss, P. Bargassa, P. Baringer,J. Barreto,J.F. Bartlett, U. Bassler,D. Bauer, S. Beale,A. Bean, M. Begalli,M. Begel,C. Belanger-Champagne, L. Bellantoni, A. Bellavance,J.A. Benitez,S.B. Beri,G. Bernardi, R. Bernhard, I. Bertram, M. Besançon,R. Beuselinck,V.A. Bezzubov,P.C. Bhat,V. Bhatnagar, G. Blazey, F. Blekman,S. Blessing,K. Bloom, A. Boehnlein,D. Boline, T.A. Bolton, E.E. Boos, G. Borissov,T. Bose,A. Brandt,R. Brock,G. Brooijmans, A. Bross,D. Brown,X.B. Bu,N.J. Buchanan, D. Buchholz,M. Buehler, V. Buescher,V. Bunichev, S. Burdin,T.H. Burnett, C.P. Buszello, P. Calfayan, S. Calvet,J. Cammin, M.A. Carrasco-Lizarraga,E. Carrera,W. Carvalho, B.C.K. Casey, H. Castilla-Valdez, S. Chakrabarti, D. Chakraborty,K.M. Chan,A. Chandra,E. Cheu,D.K. Cho,S. Choi,B. Choudhary, L. Christofek,T. Christoudias, S. Cihangir, D. Claes,J. Clutter,M. Cooke,W.E. Cooper, M. Corcoran, F. Couderc,M.-C. Cousinou, S. Crépé-Renaudin,V. Cuplov, D. Cutts, M. Cwiok,H. da Motta,A. Das, G. Davies, K. De,S.J. de Jong,E. de la Cruz-Burelo,C. de Oliveira Martins,K. Devaughan, F. Deliot, M. Demarteau,R. Demina,D. Denisov, S.P. Denisov,S. Desai, H.T. Diehl, M. Diesburg, A. Dominguez, T. Dorland,A. Dubey,L.V. Dudko, L. Duflot, S.R. Dugad, D. Duggan, A. Duperrin,S. Dutt,J. Dyer, A. Dyshkant, M. Eads, D. Edmunds, J. Ellison, V.D. Elvira, Y. Enari, S. Eno, P. Ermolov,H. Evans, A. Evdokimov, V.N. Evdokimov, A.V. Ferapontov, T. Ferbel,F. Fiedler, F. Filthaut,W. Fisher, H.E. Fisk, M. Fortner,H. Fox, S. Fu, S. Fuess, T. Gadfort, C.F. Galea, C. Garcia,A. Garcia-Bellido, V. Gavrilov,W. Geist,W. 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Yoo, S.W. Youn, J. Yu, C. Zeitnitz,S. Zelitch,T. Zhao,B. Zhou, J. Zhu, M. Zielinski,D. Zieminska, A. Zieminski, L. Zivkovic, V. Zutshi, E.G. Zverev
Physical Review Letters（2009）
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摘要
We search for the semi-inclusive process B_s^0 --\u003e D_s^(*)D_s^(*) using 2.8 fb^-1 of ppbar collisions at s^(1/2) = 1.96 TeV recorded by the D0 detector operating at the Fermilab Tevatron Collider. We observe 26.6 +/- 8.4 signal events with a significance above background of 3.2 standard deviations yielding a branching ratio of Br(B_s^0 --\u003e D_s^(*)D_s^(*)) = 0.035 +/- 0.010(stat) +/- 0.011(syst). Under certain theoretical assumptions, these double-charm final states saturate CP-even eigenstates in the B_s^0 decays resulting in a width difference of Delta_Gamma_s^CP/Gamma_s = 0.072 +/- 0.021(stat) +/- 0.022(syst). This corresponds to the first evidence for a width difference in the B_s^0 system.
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