Observation of [Formula Presented] mesons in [Formula Presented] collisions at [Formula Presented]
We report the observation of bottom-charmed mesons [Formula Presented] in 1.8 TeV [Formula Presented] collisions using the CDF detector at the Fermilab Tevatron. The [Formula Presented] mesons were found through their semileptonic decays, [Formula Presented] A fit to the [Formula Presented] mass distribution yielded [Formula Presented] events from [Formula Presented] mesons. A test of the null hypothesis, i.e., an attempt to fit the data with background alone, was rejected at the level of 4.8 standard deviations. By studying the quality of the fit as a function of the assumed [Formula Presented] mass, we determined [Formula Presented] From the distribution of trilepton intersection points in the plane transverse to the beam direction we measured the [Formula Presented] lifetime to be [Formula Presented] We also measured the ratio of production cross section times branching fraction for [Formula Presented] relative to that for [Formula Presented] to be [Formula Presented] © 1998 The American Physical Society.
Abe, F; Akimoto, H; Akopian, A; Albrow, MG; Amadon, A; Amendolia, SR; Amidei, D; Antos, J; Aota, S; Apollinari, G; Arisawa, T; Asakawa, T; Ashmanskas, W; Atac, M; Azzi-Bacchetta, P; Bacchetta, N; Bagdasarov, S; Bailey, MW; Barbaro, P; Barbaro-Galtieri, A; Barnes, VE; Barnett, BA; Barone, M; Bauer, G; Baumann, T; Bedeschi, F; Behrends, S; Belforte, S; Bellettini, G; Bellinger, J; Benjamin, D; Bensinger, J; Beretvas, A; Berge, JP; Berryhill, J; Bertolucci, S; Bettelli, S; Bevensee, B; Bhatti, A; Biery, K; Bigongiari, C; Binkley, M; Bisello, D; Blair, RE; Blocker, C; Blusk, S; Bodek, A; Bokhari, W; Bolla, G; Bonushkin, Y; Bortoletto, D; Boudreau, J; Breccia, L; Bromberg, C; Bruner, N; Brunetti, R; Buckley-Geer, E; Budd, HS; Burkett, K; Busetto, G; Byon-Wagner, A; Byrum, KL; Campbell, M; Caner, A; Carithers, W; Carlsmith, D; Cassada, J; Castro, A; Cauz, D; Cerri, A; Chang, PS; Chang, PT; Chao, HY; Chapman, J; Cheng, M; Chertok, M; Chiarelli, G; Chiou, CN; Chlebana, F; Christofek, L; Chu, ML; Cihangir, S; Clark, AG; Cobal, M; Cocca, E; Contreras, M; Conway, J; Cooper, J; Cordelli, M; Costanzo, D; Couyoumtzelis, C; Cronin-Hennessy, D; Culbertson, R; Dagenhart, D; Daniels, T; DeJongh, F; Dell’Agnello, S; Dell’Orso, M; Demina, R; Demortier, L
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