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Título: | Direct CP, Lepton Flavor, and Isospin Asymmetries in the Decays B -> K((*))l(+)l(-) |
Autor: | Babar Collaboration; Azzolini, Virginia; López-March, Neus CSIC; Martínez-Vidal, Fernando CSIC ORCID; Milanés, Diego A. CSIC ORCID; Oyanguren, Arantza CSIC ORCID; Aubert, B. | Fecha de publicación: | 6-mar-2009 | Editor: | American Physical Society | Citación: | Physical Review Letters 102 (9): 091803 (2009) | Resumen: | We measure branching fractions and integrated rate asymmetries for the rare decays B -> K((*))l(+)l(-), where l(+)l(-) is either e(+)e(-) or mu(+)mu(-), using a sample of 384x10(6) BB events collected with the BABAR detector at the PEP-II e(+)e(-) collider. We find no evidence for direct CP or lepton-flavor asymmetries. However, for dilepton masses below the J/psi resonance, we find evidence for unexpectedly large isospin asymmetries in both B -> Kl(+)l(-) and B -> K(*)l(+)l(-) which differ, respectively, by 3.2 sigma and 2.7 sigma, including systematic uncertainties, from the standard model expectations. | Versión del editor: | http://dx.doi.org/ 10.1103/PhysRevLett.102.091803 | URI: | http://hdl.handle.net/10261/22026 | DOI: | 10.1103/PhysRevLett.102.091803 | ISSN: | 0031-9007 |
Aparece en las colecciones: | (IFIC) Artículos |
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direct cp.pdf | 229,74 kB | Adobe PDF | Visualizar/Abrir |
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