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Measurement of the Λ b 0 lifetime in the decay Λ b 0 → J/ψΛ 0 with the D0 detector

  • V. M. Abazov
  • , B. Abbott
  • , M. Abolins
  • , B. S. Acharya
  • , M. Adams
  • , T. Adams
  • , M. Agelou
  • , J. L. Agram
  • , S. H. Ahn
  • , M. Ahsan
  • , G. D. Alexeev
  • , G. Alkhazov
  • , A. Alton
  • , G. Alverson
  • , G. A. Alves
  • , M. Anastasoaie
  • , S. Anderson
  • , B. Andrieu
  • , Y. Arnoud
  • , A. Askew
  • B. Asman, O. Atramentov, C. Autermann, C. Avila, F. Badaud, A. Baden, B. Baldin, P. W. Balm, S. Banerjee, E. Barberis, P. Bargassa, P. Baringer, C. Barnes, J. Barreto, J. F. Bartlett, U. Bassler, D. Bauer, A. Bean, S. Beauceron, M. Begel, A. Bellavance, S. B. Beri, G. Bernardi, R. Bernhard, I. Bertram, M. Besancon, R. Beuselinck, V. A. Bezzubov, P. C. Bhat, V. Bhatnagar, M. Binder, K. M. Black, I. Blackler, G. Blazey, F. Blekman, S. Blessing, D. Bloch, U. Blumenschein, A. Boehnlein, O. Boeriu, T. A. Bolton, F. Borcherding, G. Borissov, K. Bos, T. Bose, A. Brandt, R. Brock, G. Brooijmans, A. Bross, N. J. Buchanan, D. Buchholz, M. Buehler, V. Buescher, S. Burdin, T. H. Burnett, E. Busato, J. M. Butler, J. Bystricky, W. Carvalho, B. C.K. Casey, N. M. Cason, H. Castilla-Valdez, S. Chakrabarti, D. Chakraborty, K. M. Chan, A. Chandra, D. Chapin, F. Charles, E. Cheu, L. Chevalier, D. K. Cho, S. Choi, T. Christiansen, L. Christofek, D. Claes, B. Clément, C. Clément, Y. Coadou, M. Cooke, W. E. Cooper, D. Coppage, M. Corcoran, J. Coss, A. Cothenet, M. C. Cousinou, S. Crépé-Renaudin, M. Cristetiu, M. A.C. Cummings, D. Cutts, H. da Motta, B. Davies, G. Davies, G. A. Davis, K. De, P. de Jong, S. J. de Jong, E. de la Cruz-Burelo, C. de Oliveira Martins, S. Dean, F. Déliot, P. A. Delsart, M. Demarteau, R. Demina, P. Demine, D. Denisov, S. P. Denisov, S. Desai, H. T. Diehl, M. Diesburg, M. Doidge, H. Dong, S. Doulas, L. Duflot, S. R. Dugad, A. Duperrin, J. Dyer, A. Dyshkant, M. Eads, D. Edmunds, T. Edwards, J. Ellison, J. Elmsheuser, J. T. Eltzroth, V. D. Elvira, S. Eno, P. Ermolov, O. V. Eroshin, J. Estrada, D. Evans, H. Evans, A. Evdokimov, V. N. Evdokimov, J. Fast, S. N. Fatakia, L. Feligioni, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H. E. Fisk, M. Fortner, H. Fox, W. Freeman, S. Fu, S. Fuess, T. Gadfort, C. F. Galea, E. Gallas, E. Galyaev, C. Garcia, A. Garcia-Bellido, J. Gardner, V. Gavrilov, P. Gay, D. Gelé, R. Gelhaus, K. Genser, C. E. Gerber, Y. 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  • Joint Institute for Nuclear Research, Dubna
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  • Institute for Nuclear Physics
  • Czech Technical University in Prague
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Résultats de recherche: Contribution à un journalArticleRevue par des pairs

Résumé

We present measurements of the Λ b 0 lifetime in the exclusive decay channel Λ b 0 → J/ψΛ 0with J/ψ → μ +μ - and Λ 0 → pπ -, the B 0 lifetime in the decay B 0 → J/ψ/K s 0 with J/ ψ → μ + μ - and K s 0 → π + π -, and the ratio of these lifetimes. The analysis is based on approximately 250 pb -1 of data recorded with the D0 detector in pp̄ collisions at √s = 1.96 TeV. The Λ b 0 lifetime is determined to be τ(Λ b 0) = 1.22 -0.18 +0.22(stat) ± 0.04(syst) ps, the B 0 lifetime τ(B 0) = 1.40 -0.10 0.11(stat) ± 0.03(syst) ps, and the ratio τ(Λ b 0)/ τ(B 0) = 0.87- 0.14 0.17(stat) ± 0.03(syst). In contrast with previous measurements using semileptonic decays, this is the first determination of the Λ b 0 lifetime based on a fully reconstructed decay channel.

langue originaleAnglais
Numéro d'article102001
journalPhysical Review Letters
Volume94
Numéro de publication10
Les DOIs
étatPublié - 18 mars 2005
Modification externeOui

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