Study of the X ± (5568 ) state with semileptonic decays of the B s 0 meson

V. M. Abazov,Brad Abbott,Bobby Samir Acharya,Mark Raymond Adams,Todd Adams, J. P. Agnew,G. D. Alexeev, G. Alkhazov, A. Alton, Andrew Askew, S. Atkins,Kamil Augsten,V. Aushev,Y. Aushev,Carlos Avila, F. Badaud, L. Bagby, B. Baldin,D. V. Bandurin,Sw. Banerjee,Emanuela Barberis,Philip Baringer,James G. Bartlett,U. Bassler,V. E. Bazterra,Alice Bean,Marcia Begalli, L. Bellantoni,Suman Bala Beri,Gregorio Bernardi, R. Bernhard,Iain Alexander Bertram,Marc Besancon,R. Beuselinck,Pushpalatha C Bhat,S. Bhatia,V. Bhatnagar, G. C. Blazey, S. Blessing,Kenneth Bloom, A. Boehnlein,D. Boline, E. E. Boos,Guennadi Borissov, M. Borysova,Andrew Brandt,Oleg Brandt, M. Brochmann,Raymond Brock,A. Bross,D.P. Brown,X. B. Bu,M. Buehler,Volker Buescher,Viacheslav Bunichev,Sergey Burdin,Claus P. Buszello,E. Camacho-Pérez, B. C.K. Casey,Heriberto Castilla-Valdez, S. Caughron, S. Chakrabarti,Kwok Ming Chan,A. Chandra,Emilien Chapon,Guo-Ming Chen, S. W. Cho,Suyong Choi,Brajesh C Choudhary, S. Cihangir,Daniel R Claes,J. Clutter,M. Cooke,W. E. Cooper,M. D. Corcoran,Fabrice Couderc, M. C. Cousinou,Jakub Cúth,David Cutts,A. Das,Gavin Davies,S. J. De Jong,E. De La Cruz-Burelo,Frederic Deliot,Regina Demina,Dmitri Denisov,Sergey Denisov,S. Desai,Cecile Deterre,K. Devaughan,H. T. Diehl, M. Diesburg,P. F. Ding,Aaron Dominguez, A. Drutskoy,A. Dubey,Lev Dudko,Arnaud Duperrin,S. Dutt, M. Eads

Physical Review D（2018）

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摘要

We present a study of the X±(5568) using semileptonic decays of the Bs0 meson using the full run II integrated luminosity of 10.4 fb-1 in proton-antiproton collisions at a center of mass energy of 1.96 TeV collected with the D0 detector at the Fermilab Tevatron Collider. We report evidence for a narrow structure, X±(5568), in the decay sequence X±(5568)→Bs0π± where Bs0→μ∓Ds±X, Ds±→ϕπ± which is consistent with the previous measurement by the D0 Collaboration in the hadronic decay mode, X±(5568)→Bs0π± where Bs0→J/ψϕ. The mass and width of this state are measured using a combined fit of the hadronic and semileptonic data, yielding m=5566.9-3.1+3.2(stat)-1.2+0.6(syst) MeV/c2, Γ=18.6-6.1+7.9(stat)-3.8+3.5(syst) MeV/c2 with a significance of 6.7σ.

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