Observation and mass measurement of the baryon Ξb-

Authors

T. Aaltonen, Helsingin Yliopisto
A. Abulencia, University of Illinois Urbana-Champaign
J. Adelman, The Enrico Fermi Institute
T. Affolder, University of California, Santa Barbara
T. Akimoto, University of Tsukuba
M. G. Albrow, Fermi National Accelerator Laboratory
S. Amerio, Università degli Studi di Padova
D. Amidei, University of Michigan, Ann Arbor
A. Anastassov, Rutgers University–New Brunswick
K. Anikeev, Fermi National Accelerator Laboratory
A. Annovi, INFN, Laboratori Nazionali Di Frascati
J. Antos, Univerzita Komenského v Bratislave
M. Aoki, University of Tsukuba
G. Apollinari, Fermi National Accelerator Laboratory
T. Arisawa, Waseda University
A. Artikov, Joint Institute for Nuclear Research, Dubna
W. Ashmanskas, Fermi National Accelerator Laboratory
A. Attal, Universitat Autònoma de Barcelona
A. Aurisano, Texas A&M University
F. Azfar, University of Oxford
P. Azzi-Bacchetta, Università degli Studi di Padova
P. Azzurri, Scuola Normale Superiore di Pisa
N. Bacchetta, Università degli Studi di Padova
W. Badgett, Fermi National Accelerator Laboratory
A. Barbaro-Galtieri, Lawrence Berkeley National Laboratory
V. E. Barnes, Purdue University
B. A. Barnett, Johns Hopkins University
S. Baroiant, University of California, Davis

Document Type

Article

Publication Date

8-3-2007

Abstract

We report the observation and measurement of the mass of the bottom, strange baryon Ξb- through the decay chain Ξb-→J/ψΞ-, where J/ψ→μ+μ-, Ξ-→Λπ-, and Λ→pπ-. A signal is observed whose probability of arising from a background fluctuation is 6.6×10-15, or 7.7 Gaussian standard deviations. The Ξb- mass is measured to be 5792.9±2.5(stat) ±1.7(syst)MeV/c2. © 2007 The American Physical Society.

Publication Source (Journal or Book title)

Physical Review Letters

Recommended Citation

Aaltonen, T., Abulencia, A., Adelman, J., Affolder, T., Akimoto, T., Albrow, M., 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., Barnett, B., & Baroiant, S. (2007). Observation and mass measurement of the baryon Ξb-. Physical Review Letters, 99 (5) https://doi.org/10.1103/PhysRevLett.99.052002