Measurement Of The Lambda(0)(B) Lifetime In Lambda(0)(B) -> Lambda(+)(C)Pi(-) Decays In P(P)Over-Bar Collisions At Root S=1.96 Tev

T. Aaltonen,J. Adelman,B. Álvarez González,S. Amerio, D. Amidei, A. Anastassov,A. Annovi, J. Antos, G. Apollinari, A. Apresyan,T. Arisawa,A. Artikov,J. Asaadi,W. Ashmanskas,A. Attal,A. Aurisano, F. Azfar,W. Badgett, A. Barbaro-Galtieri, V. E. Barnes,B. A. Barnett,P. Barria,P. Bartos,G. Bauer,P.-H. Beauchemin,F. Bedeschi,D. Beecher,S. Behari, G. Bellettini, J. Bellinger,D. Benjamin, A. Beretvas,A. Bhatti,M. Binkley, D. Bisello, I. Bizjak,R. E. Blair,C. Blocker, B. Blumenfeld, A. Bocci,A. Bodek, V. Boisvert,D. Bortoletto,J. Boudreau, A. Boveia, B. Brau,A. Bridgeman, L. Brigliadori,C. Bromberg,E. Brubaker, J. Budagov,H. S. Budd,S. Budd, K. Burkett,G. Busetto, P. Bussey,A. Buzatu,K. L. Byrum,S. Cabrera,C. Calancha,S. Camarda,M. Campanelli, M. Campbell,F. Canelli, A. Canepa,B. Carls, D. Carlsmith,R. Carosi,S. Carrillo,S. Carron, B. Casal,M. Casarsa,A. Castro,P. Catastini, D. Cauz,V. Cavaliere, M. Cavalli-Sforza,A. Cerri, L. Cerrito, S. H. Chang,Y. C. Chen, M. Chertok,G. Chiarelli,G. Chlachidze, F. Chlebana,K. Cho,D. Chokheli, J. P. Chou,K. Chung,W. H. Chung, Y. S. Chung, T. Chwalek,C. I. Ciobanu,M. A. Ciocci,A. Clark,D. Clark,G. Compostella,M. E. Convery,J. Conway,M. Corbo,M. Cordelli,C. A. Cox,D. J. Cox, F. Crescioli,C. Cuenca Almenar,J. Cuevas, R. Culbertson,J. C. Cully,D. Dagenhart,M. Datta,T. Davies,P. de Barbaro,S. De Cecco, A. Deisher,G. De Lorenzo,M. Dell’Orso, C. Deluca, L. Demortier,J. Deng, M. Deninno,M. d’Errico,A. Di Canto,G. P. di Giovanni,B. Di Ruzza,J. R. Dittmann,M. D’Onofrio, S. Donati,P. Dong,T. Dorigo,S. Dube,K. Ebina,A. Elagin, R. Erbacher, D. Errede, S. Errede,N. Ershaidat, R. Eusebi, H. C. Fang,S. Farrington,W. T. Fedorko,R. G. Feild, M. Feindt,J. P. Fernandez,C. Ferrazza, R. Field, G. Flanagan,R. Forrest,M. J. Frank,M. Franklin,J. C. Freeman, I. Furic,M. Gallinaro,J. Galyardt, F. Garberson,J. E. Garcia,A. F. Garfinkel, P. Garosi,H. Gerberich, D. Gerdes, A. Gessler,S. Giagu, V. Giakoumopoulou,P. Giannetti,K. Gibson,J. L. Gimmell,C. M. 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PHYSICAL REVIEW LETTERS（2010）

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摘要

We report a measurement of the lifetime of the Lambda(0)(b) baryon in decays to the Lambda(+)(c)pi(-) final state in a sample corresponding to 1.1 fb(-1) collected in p (p) over bar collisions at root s = 1.96 TeV by the CDF II detector at the Tevatron collider. Using a sample of about 3000 fully reconstructed Lambda(0)(b) events we measure tau(Lambda(0)(b) ) = 1.401 +/- 0.046(stat) +/- 0.035(syst) ps (corresponding to c tau(Lambda(0)(b)) = 420.1 +/- 13.7(stat) +/- 10.6(syst) mu m, where c is the speed of light). The ratio of this result and the world average B-0 lifetime yields tau(Lambda(0)(b))/tau(B-0) = 0.918 +/- 0.038 (stat) and (syst), in good agreement with recent theoretical predictions.

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