Observation Of Lambda(B)(0)->J/Psi Lambda At The Fermilab Proton-Antiproton Collider

F. Abe, H. Akimoto, A. Akopian, M. G. Albrow,S. R. Amendolia, D. Amidei, J. Antos,C. Anway-Wiese,S. Aota, G. Apollinari,T. Asakawa,W. Ashmanskas, M. Atac, F. Azfar,P. Azzi-Bacchetta, N. Bacchetta,W. Badgett,S. Bagdasarov,M. W. Bailey,J. Bao,P. de Barbaro, A. Barbaro-Galtieri, V. E. Barnes, B. A. Barnett,E. Barzi, G. Bauer,T. Baumann, F. Bedeschi,S. Behrends, S. Belforte, G. Bellettini, J. Bellinger, D. Benjamin,J. Benlloch,J. Bensinger,D. Benton,A. Beretvas,J. P. Berge, J. Berryhill,S. Bertolucci,B. Bevensee, A. Bhatti,K. Biery, M. Binkley, D. Bisello,R. E. Blair,C. Blocker,A. Bodek,W. Bokhari,V. Bolognesi, G. Bolla,D. Bortoletto, J. Boudreau,L. Breccia,C. Bromberg,N. Bruner,E. Buckley-Geer,H. S. Budd, K. Burkett,G. Busetto,A. Byon-Wagner, K. L. Byrum,J. Cammerata,C. Campagnari, M. Campbell,A. Caner,W. Carithers, D. Carlsmith, A. Castro, D. Cauz,Y. Cen,F. Cervelli, P. S. Chang, P. T. Chang,H. Y. Chao,J. Chapman,M.-T. Cheng, G. Chiarelli,T. Chikamatsu, C. N. Chiou,L. Christofek, S. 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Wu,J. Wyss, A. Yagil, W. Yao,K. Yasuoka,Y. Ye,G. P. Yeh,P. Yeh,M. Yin, J. Yoh,C. Yosef,T. Yoshida,D. Yovanovitch, I. Yu,L. Yu, J. C. Yun, A. Zanetti,F. Zetti, L. Zhang,W. Zhang,S. Zucchelli

PHYSICAL REVIEW D(1997)

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摘要
The decay Lambda(b)(0) --> J/psi Lambda is observed in 110 pb(-1) of p (p) over bar collisions taken at root s = 1.8 TeV. These data are used to measure a Lambda(b)(0) mass of 5621+/-4(stat)+/-3(syst) MeV/c(2), and a mass difference between the Lambda(b)(0) and the B-0 of 340+/-5(stat)+/-1(syst) MeV/c(2). The production cross-section times branching fraction for the decay Lambda(b)(0) --> J/psi Lambda relative to that for the decay B-0 --> J/psi K-S(0) has been measured to be 0.27+/-0.12(stat)+/-0.05(syst).
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