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Direct observations of the decay of beauty particles into charm particles |
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| Authors: | J.P. Albanese V. Alpe S. Aoki R. Arnold G. Baroni M. Barth J.H. Bartley D. Bertrand G. Bertrand-Coremans V. Bisi A.C. Breslin G. Carboni E. Chesi K. Chiba G.S. Cook M. Coupland G. Crosetti D.H. Davis Y. Yanagisawa |
| Affiliation: | 1. Aichi University of Education, Kariya, Japan;2. Aichi Women''s College, Nisshin-Cho 470-01, Japan;3. Istituto di Fisica dell''Università and INFN, Bari, Italy;4. Birkbeck College, London, England;5. Inter-University Institute for High Energies, ULB-VUB, Brussels, Belgium;6. CERN, Geneva, Switzerland;7. University College Dublin, Dublin, Ireland;8. Faculty of Education, University of Gifu, Gifu, Japan;9. University College London, London, England;10. Department of Physics, Nagoya University, Nagoya, Japan;11. Nagoya Institute of Technology, Nagoya, Japan;12. Dipartimento di Fisica, Università “La Sapienza” and INFN, Rome, Italy;13. Faculty of Science, Toho University, Funabashi, Japan;14. Istituto di Fisica dell''Università di Torino, and INFN Torino, Turin, Italy;15. Faculty of Education, Utsunomiya University, Utsunomiya, Japan;p. Faculty of Education, Yokohama National University, Yokohama, Japan |
| Abstract: | The associated production of a pair of beauty particles B? and by a 350 GeV π? interaction has been observed in an emulsion target inserted in an array of silicon microstrip detectors. Both beauty particles decay into charm particles, both of which are also observed to decay in the emulsion. Two negative muons were identified and their momenta measured in a large muon spectrometer. One muon has a pT of 1.9 GeV/c and is associated with a beauty particle decay. The other, with a pT of 0.45 GeV/c is associated with a charm particle decay. The flight times of the two beauty particles are respectively (0.8 ± 0.1) × 10?13 s and (5+2?1) × 10?13 s. Alternative interpretations of this event have negligible probability. |
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