Lifetime difference and CP-violating phase in the Bs0 system

• Published in: Physical review letters 2007-03, Vol.98 (12), p.121801-121801
• Main Authors: Abazov, V M, Abbott, B, Abolins, M, Acharya, B S, Adams, M, Adams, T, Aguilo, E, Ahn, S H, Ahsan, M, Alexeev, G D, Alkhazov, G, Alton, A, Alverson, G, Alves, G A, Anastasoaie, M, Ancu, L S, Andeen, T, Anderson, S, Andrieu, B, Anzelc, M S, Arnoud, Y, Arov, M, Askew, A, Asman, B, Assis Jesus, A C S, Atramentov, O, Autermann, C, Avila, C, Ay, C, Badaud, F, Baden, A, Bagby, L, Baldin, B, Bandurin, D V, Banerjee, P, Banerjee, S, Barberis, E, Barfuss, A-F, Bargassa, P, Baringer, P, Barnes, C, 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, Berntzon, L, Bertram, I, Besançon, M, Beuselinck, R, Bezzubov, V A, Bhat, P C, Bhatnagar, V, Binder, M, Biscarat, C, Blackler, I, Blazey, G, Blekman, F, Blessing, S, Bloch, D, Bloom, K, Boehnlein, A, Boline, D, Bolton, T A, Borissov, G, Bos, K, Bose, T, Brandt, A, Brock, R, Brooijmans, G, Bross, A, Brown, D, Buchanan, N J, Buchholz, D, Buehler, M, Buescher, V, Burdin, S, Burke, S, Burnett, T H, Busato, E, Buszello, C P, Butler, J M, Calfayan, P, Calvet, S, Cammin, J, Caron, S, Carvalho, W, Casey, B C K, Cason, N M, Castilla-Valdez, H
• Format: Article
• Language: English
• ISSN: 0031-9007
• DOI: 10.1103/PhysRevLett.98.121801

From an analysis of the decay Bs0-->J/psi phi, we obtain the width difference between the light and heavy mass eigenstates DeltaGamma identical with (GammaL-GammaH)=0.17+/-0.09(stat)+/-0.02(syst) ps-1 and the CP-violating phase phis=-0.79+/-0.56(stat)(-0.01)(+0.14)(syst). Under the hypothesis of no CP violation (phis identical with 0), we obtain 1/Gamma=tau(Bs0)=1.52+/-0.08(stat)(-0.03)(+0.01)(syst) ps and DeltaGamma=0.12(-0.10)(+0.08)(stat)+/-0.02(syst) ps-1. The data sample corresponds to an integrated luminosity of about 1.1 fb-1 accumulated with the D0 detector at the Fermilab Tevatron collider. This is the first direct measurement of the CP-violating mixing phase in the Bs0 system.