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  • Evidence for the decay B_s^...
    Abazov, V.M.; Abbott, B.; Abolins, M.; Acharya, B.S.; Adams, M.; Adams, T.; Aguilo, E.; Ahsan, M.; Alexeev, G.D.; Alkhazov, G.; Alton, A.; Alverson, G.; Alves, G.A.; Anastasoaie, M.; Ancu, L.S.; Andeen, T.; Andrieu, B.; Anzelc, M.S.; Aoki, M.; Arnoud, Y.; Arov, M.; Arthaud, M.; Askew, A.; Asman, B.; Assis Jesus, A.C.S.; Atramentov, O.; Avila, C.; Badaud, F.; Bagby, L.; Baldin, B.; Bandurin, D.V.; Banerjee, P.; Banerjee, S.; Barberis, E.; Barfuss, A.-F.; Bargassa, P.; Baringer, P.; Barreto, J.; Bartlett, J.F.; Bassler, U.; Bauer, D.; Beale, S.; Bean, A.; Begalli, M.; Begel, M.; Belanger-Champagne, C.; Bellantoni, L.; Bellavance, A.; Benitez, J.A.; Beri, S.B.; Bernardi, G.; Bernhard, R.; Bertram, I.; Besançon, M.; Beuselinck, R.; Bezzubov, V.A.; Bhat, P.C.; Bhatnagar, V.; Blazey, G.; Blekman, F.; Blessing, S.; Bloom, K.; Boehnlein, A.; Boline, D.; Bolton, T.A.; Boos, E.E.; Borissov, G.; Bose, T.; Brandt, A.; Brock, R.; Brooijmans, G.; Bross, A.; Brown, D.; Bu, X.B.; Buchanan, N.J.; Buchholz, D.; Buehler, M.; Buescher, V.; Bunichev, V.; Burdin, S.; Burnett, T.H.; Buszello, C.P.; Calfayan, P.; Calvet, S.; Cammin, J.; Carrasco-Lizarraga, M.A.; Carrera, E.; Carvalho, W.; Casey, B.C.K.; Castilla-Valdez, H.; Chakrabarti, S.; Chakraborty, D.; Chan, K.M.; Chandra, A.; Cheu, E.; Cho, D.K.; Choi, S. K.; Choudhary, B.; Christofek, L.; Christoudias, T.

    Physical review letters, 2009, Letnik: 102
    Journal Article

    We search for the semi-inclusive process B_s^0 --> 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 --> 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.