Direct observation of the strange b Baryon Ξb

V. M. Abazov,Brad Abbott, M. Abolins,B. S. Acharya,Mary Beth Adams,Todd Adams, E. 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, L. Berntzon,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, K. Bos,Tulika Bose,Andrew Brandt,Raymond Brock,Gustaaf Brooijmans, A. Bross,D. Brown,N. J. Buchanan, D. Buchholz,M. Buehler, V. Buescher,Sergey Burdin,S. Burke,T. H. Burnett, C. P. Buszello,J. N. Butler,Philippe Calfayan, S. Calvet,J. Cammin,Sascha Caron,Wagner Carvalho, B. C.K. Casey, N. M. Cason,Heriberto Castilla-Valdez, S. Chakrabarti,D. Chakraborty,K. M. Chan

Physical Review Letters（2007）

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摘要

We report the first direct observation of the strange b baryon Xi(b)- (Xi(b)+). We reconstruct the decay Xi(b)- -->J/psiXi-, with J/psi-->mu+mu-, and Xi--->Lambdapi--->ppi-pi- in pp collisions at square root of s =1.96 TeV. Using 1.3 fb(-1) of data collected by the D0 detector, we observe 15.2 +/- 4.4(stat)(-0.4)(+1.9)(syst) Xi(b)- candidates at a mass of 5.774 +/- 0.011(stat) +/- 0.015(syst) GeV. The significance of the observed signal is 5.5 sigma, equivalent to a probability of 3.3 x 10(-8) of it arising from a background fluctuation. Normalizing to the decay Lambda(b)-->J/psiLambda, we measure the relative rate sigma(Xi(b-) x B(Xi)b})- -->J/psiXi-)/sigma(Lambda(b)) x B(Lambda(b)-->J/psiLambda) = 0.28+/-0.09(stat)(-0.08)(+0.09)(syst).

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