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Título : Observation of the Baryonic Flavor-Changing Neutral Current Decay Λb0→Λμ+μ-
Autor : 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
Fecha de publicación : Nov-2011
Editor: American Physical Society
Resumen: 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.
Descripción : 8 páginas, 2 figuras, 4 tablas.-- PACS numbers: 13.30.Ce, 12.15.Mm, 14.20.Mr.-- CDF Collaboration: et al.
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ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.107.201802
Citación : Physical Review Letters 107(20): 201802 (2011)
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