A search has been performed for Bs0→μ+μ- and B0→μ+μ- decays using 7  fb-1 of integrated luminosity collected by the CDF II detector at the Fermilab Tevatron collider. The observed number of B0 candidates is consistent with background-only expectations and yields an upper limit on the branching fraction of B(B0→μ+μ-)<6.0×10-9 at 95% confidence level. We observe an excess of Bs0 candidates. The probability that the background processes alone could produce such an excess or larger is 0.27%. The probability that the combination of background and the expected standard model rate of Bs0→μ+μ- could produce such an excess or larger is 1.9%. These data are used to determine B(Bs0→μ+μ-)= (1.8-0.9+1.1)×10-8 and provide an upper limit of B(Bs0→μ+μ-)<4.0×10-8 at 95% confidence level.
T. AALTONEN, B. A'LVAREZ GONZA'LEZ, S. AMERIO, D. AMIDEI, A. ANASTASSOV, A. ANNOVI, et al. (2011). Search for Bs0→μ+μ- and B0→μ+μ- Decays with CDF II. PHYSICAL REVIEW LETTERS, 107, 191801-1-191801-7 [10.1103/PhysRevLett.107.191801].
Search for Bs0→μ+μ- and B0→μ+μ- Decays with CDF II
BRIGLIADORI, LUCA;CASTRO, ANDREA;MOGGI, NICCOLO';ZUCCHELLI, STEFANO
2011
Abstract
A search has been performed for Bs0→μ+μ- and B0→μ+μ- decays using 7 fb-1 of integrated luminosity collected by the CDF II detector at the Fermilab Tevatron collider. The observed number of B0 candidates is consistent with background-only expectations and yields an upper limit on the branching fraction of B(B0→μ+μ-)<6.0×10-9 at 95% confidence level. We observe an excess of Bs0 candidates. The probability that the background processes alone could produce such an excess or larger is 0.27%. The probability that the combination of background and the expected standard model rate of Bs0→μ+μ- could produce such an excess or larger is 1.9%. These data are used to determine B(Bs0→μ+μ-)= (1.8-0.9+1.1)×10-8 and provide an upper limit of B(Bs0→μ+μ-)<4.0×10-8 at 95% confidence level.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
