Dijous 11 de juny, el Dipòsit Digital no estarà operatiu de 15:00 a 17:00 h per tasques de manteniment. Disculpeu les molèsties.
El jueves 11 de Junio, el Dipòsit Digital no estará operativo de 15:00 a 17:00 h debido a tareas de mantenimiento. Disculpen las molestias.
Thursday, Jun 11th, the Digital Repository will be unavailable due to a system update.

Files

577759.pdf (246.06 KB)

Document type

Article

Version

Published version

Publication date

2009-03-04

All rights reserved

Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/138320

Direct CP, Lepton Flavor, and Isospin Asymmetries in the Decays B→K(*)l+l−

Journal Title

Authors

Director/Tutor

Journal ISSN

Volume Title

Related resource

https://doi.org/10.1103/PhysRevLett.102.091803

Abstract

We measure branching fractions and integrated rate asymmetries for the rare decays B → K ( * ) l + l − , where l + l − is either e + e − or μ + μ − , using a sample of 384 × 10 6 B ¯¯¯ B events collected with the BABAR detector at the PEP-II e + e − collider. We find no evidence for direct C P or lepton-flavor asymmetries. However, for dilepton masses below the J / ψ resonance, we find evidence for unexpectedly large isospin asymmetries in both B → K l + l − and B → K ∗ l + l − which differ, respectively, by 3.2 σ and 2.7 σ , including systematic uncertainties, from the standard model expectations.

Subject

Física de partícules, Experiments

Subject (English)

Particle physics, Experiments

Citation

Collections

Articles publicats en revistes (Física Quàntica i Astrofísica)

Citation

GARRA TICÓ, Jordi, GRAUGÉS POUS, Eugeni and BABAR Collaboration. Direct CP, Lepton Flavor, and Isospin Asymmetries in the Decays B→K(*)l+l−. Physical Review Letters. 2009. Vol. 102, num. 9, pags. 091803. ISSN 0031-9007. [consulted: 12 of June of 2026]. Available at: https://hdl.handle.net/2445/138320

Export metadata

JSON - METS

Share record