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Measurement of the Forward-Backward Asymmetry in the B-->K[superscript (*)]mu+mu- Decay and First Observation of the Bs[superscript 0]-->phimu+mu- Decay

Author(s)
Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Paus, Christoph M. E.; Bauer, Gerry P; Makhoul, Khaldoun
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Alternative title
Measurement of the Forward-Backward Asymmetry in the B→K(*)μ+μ- Decay and First Observation of the Bs0→ϕμ+μ- Decay
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
We reconstruct the rare decays B+-->K+mu+mu-, B0-->K*(892)0mu+mu-, and Bs0-->phi(1020)mu+mu- in a data sample corresponding to 4.4  fb-1 collected in pp[over-bar] collisions at [sqrt]s=1.96  TeV by the CDF II detector at the Tevatron Collider. Using 121±16 B+-->K+mu+mu- and 101±12 B0-->K*0mu+mu- decays we report the branching ratios. In addition, we report the differential branching ratio and the muon forward-backward asymmetry in the B+ and B0 decay modes, and the K*0 longitudinal polarization fraction in the B0 decay mode with respect to the squared dimuon mass. These are consistent with the predictions, and most recent determinations from other experiments and of comparable accuracy. We also report the first observation of the Bs0-->phimu+mu- decay and measure its branching ratio BR(Bs0-->phimu+mu-)=[1.44±0.33±0.46]×10-6 using 27±6 signal events. This is currently the most rare Bs0 decay observed.
Date issued
2011-04
URI
http://hdl.handle.net/1721.1/67009
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
T. Aaltonen et al. (CDF Collaboration). "Measurement of the Forward-Backward Asymmetry in the B-->K[superscript (*)]mu+mu- Decay and First Observation of the Bs[superscript 0]-->phimu+mu- Decay." Phys. Rev. Lett. 106, 161801 (2011) [7 pages] © 2011 American Physical Society.
Version: Final published version
ISSN
0031-9007

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