Observation and Mass Measurement of the Baryon Ξ b

Observation and Mass Measurement of the Baryon Ξ b

We report the observation and measurement of the mass of the bottom, strange baryon Xi-_b through the decay chain Xi-_b --> J/psi Xi-, where J/psi --> mu+ mu-, Xi- --> Lambda pi+-, and Lambda --> p pi+-, and Lambda --> p pi+-. Evidence for observation is based on a signal whose probab...

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Veröffentlicht in:Physical review letters 2007-08, Vol.99 (5), Article 052002
Hauptverfasser: Aaltonen, T., Abulencia, A., Adelman, J., Affolder, T., Akimoto, T., Albrow, M. G., Amerio, S., Amidei, D., Anastassov, A., Anikeev, K., Annovi, A., Antos, J., Aoki, M., Apollinari, G., Arisawa, T., Artikov, A., Ashmanskas, W., Attal, A., Aurisano, A., Azfar, F., Azzi-Bacchetta, P., Azzurri, P., Bacchetta, N., Badgett, W., Barbaro-Galtieri, A., Barnes, V. E., Barnett, B. A., Baroiant, S., Bartsch, V., Bauer, G., Beauchemin, P.-H., Bedeschi, F., Behari, S., Bellettini, G., Bellinger, J., Belloni, A., Benjamin, D., Beretvas, A., Beringer, J., Berry, T., Bhatti, A., Binkley, M., Bisello, D., Bizjak, I., Blair, R. E., Blocker, C., Blumenfeld, B., Bocci, A., Bodek, A., Boisvert, V., Bolla, G., Bolshov, A., Bortoletto, D., Boudreau, J., Boveia, A., Brau, B., Brigliadori, L., Bromberg, C., Brubaker, E., Budagov, J., Budd, H. S., Budd, S., Burkett, K., Busetto, G., Bussey, P., Buzatu, A., Byrum, K. L., Cabrera, S., Campanelli, M., Campbell, M., Canelli, F., Canepa, A., Carrillo, S., Carlsmith, D., Carosi, R., Carron, S., Casal, B., Casarsa, M., Castro, A., Catastini, P., Cauz, D., Cavalli-Sforza, M., Cerri, A., Cerrito, L., Chang, S. H., Chen, Y. C., Chertok, M., Chiarelli, G., Chlachidze, G., Chlebana, F., Cho, I., Cho, K., Chokheli, D., Chou, J. P., Choudalakis, G., Chuang, S. H., Chung, K., Chung, W. H., Chung, Y. S., Cilijak, M.
Format: Artikel
Sprache:eng
Schlagworte:
High Energy Physics - Experiment
Physics
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Zusammenfassung:We report the observation and measurement of the mass of the bottom, strange baryon Xi-_b through the decay chain Xi-_b --> J/psi Xi-, where J/psi --> mu+ mu-, Xi- --> Lambda pi+-, and Lambda --> p pi+-, and Lambda --> p pi+-. Evidence for observation is based on a signal whose probability of arising from the estimated background is 6.6 x 10-15, or 7.7 Gaussian standard deviations. The Xi-_b mass is measured to be 5792.9 +/- 2.5 (stat.) +/-1.7 (syst.) MeV/c2.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.99.052002