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Title

Observation of the Baryonic Flavor-Changing Neutral Current Decay Λb0→Λμ+μ-

AuthorsAaltonen, 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 DateNov-2011
PublisherAmerican Physical Society
CitationPhysical Review Letters 107(20): 201802 (2011)
AbstractWe 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.
Description8 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
URIhttp://hdl.handle.net/10261/46368
DOI10.1103/PhysRevLett.107.201802
ISSN0031-9007
E-ISSN1079-7114
Appears in Collections:(IFCA) Artículos
(IFIC) Artículos
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