Measurement of the semileptonic branching ratio of Bs0 to an orbitally excited Ds** state: Br(Bs0→Ds1-(2536)μ+νX)

V. M. Abazov,Brad Abbott, M. Abolins,B. S. Acharya,Mark Raymond Adams,Todd Adams,Ernest Aguilo,S. H. Ahn, M. Ahsan,G. D. Alexeev, G. Alkhazov, A. Alton,George Alverson,Gilvan Alves,M. Anastasoaie, L. S. Ancu,Timothy Andeen,S. Anderson,B. Andrieu,M. S. Anzelc,Y. Arnoud,M. Arov,M. Arthaud,Andrew Askew,B. Åsman,A. C.S. Assis Jesus,O. Atramentov,Christian Autermann,Carlos Avila, C. Ay,F. Badaud, A. Baden,L. Bagby, B. Baldin,D. V. Bandurin, S. Banerjee,P. Banerjee,Emanuela Barberis,A. F. Barfuss,Pedrame Bargassa,Philip Baringer,J. Barreto,J. F. Bartlett,U. Bassler,D. Bauer,S. Beale,Alice Bean, Marcia Begalli,Michael Begel,C. Belanger-Champagne, L. Bellantoni,A. Bellavance,J. A. Benitez,Suman Bala Beri,Gregorio Bernardi, R. Bernhard,Iain Alexander Bertram,Marc Besancon,R. Beuselinck,V. A. Bezzubov,Pushpalatha C Bhat,Vipin Bhatnagar,C. Biscarat,G. C. Blazey,Freya Blekman,S. Blessing,Daniel Bloch,Kenneth Bloom, A. Boehnlein,D. Boline,T. A. Bolton,Guennadi Borissov,Tulika Bose,Andrew Brandt,Raymond Brock,Gustaaf Brooijmans,A. Bross, Deidre Brown,N. J. Buchanan, D. Buchholz, M. Buehler,V. Buescher, S. Bunichev,Sergey Burdin, S. Burke,T. H. Burnett, C. P. Buszello,J. N. Butler,Philippe Calfayan,Samuel Calvet,J. Cammin,Wagner Carvalho,B. C.K. Casey,N. M. Cason,Heriberto Castilla-Valdez, S. Chakrabarti,D. Chakraborty,K. M. Chan,Kee Chan, A. Chandra

Physical Review Letters（2009）

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Abstract

In a data sample of approximately 1.3 fb-1 collected with the D0 detector between 2002 and 2006, the orbitally excited charm state D_s1(2536) has been observed with a measured mass of 2535.7 +/- 0.6 (stat) +/- 0.5 (syst) MeV via the decay mode B0_s -> D_s1(2536) mu nu X. A first measurement is made of the branching ratio product Br(b(bar) -> D_s1(2536) mu nu X).Br(D_s1(2536)->D* K0_S). Assuming that D_s1(2536) production in semileptonic decay is entirely from B0_s, an extraction of the semileptonic branching ratio Br(B0_s -> D_s1(2536) mu nu X) is made.

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Key words

semileptonic branching ratio ofbs0to

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