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Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/46368
Title: Observation of the Baryonic Flavor-Changing Neutral Current Decay Λb0→Λμ+μ-
Authors: Aaltonen, T.; Álvarez González, B.; Casal, Bruno; Cuevas, Javier; Gómez, G.; Palencia, Enrique; Rodrigo, Teresa; Ruiz Jimeno, Alberto; Scodellaro, Luca; Vila, Iván; Vilar, Rocío; Cabrera, Susana; Cuenca Almenar, Cristóbal
Issue Date: Nov-2011
Publisher: American Physical Society
Citation: Physical Review Letters 107(20): 201802 (2011)
Abstract: We report the first observation of the baryonic flavor-changing neutral current decay Λb0→Λμ+μ- with 24 signal events and a statistical significance of 5.8 Gaussian standard deviations. This measurement uses a pp̅ collisions data sample corresponding to 6.8  fb-1 at √s=1.96  TeV collected by the CDF II detector at the Tevatron collider. The total and differential branching ratios for Λb0→Λμ+μ- are measured. We find B(Λb0→Λμ+μ-)=[1.73±0.42(stat)±(syst)]×10-6. We also report the first measurement of the differential branching ratio of Bs0→ϕμ+μ-, using 49 signal events. In addition, we report branching ratios for B+→K+μ+μ-, B0→K0μ+μ-, and B→K*(892)μ+μ- decays.
Description: 8 páginas, 2 figuras, 4 tablas.-- PACS numbers: 13.30.Ce, 12.15.Mm, 14.20.Mr.-- CDF Collaboration: et al.
Publisher version (URL): http://dx.doi.org/10.1103/PhysRevLett.107.201802
URI: http://hdl.handle.net/10261/46368
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.107.201802
E-ISSN: 1079-7114
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