期刊
PHYSICAL REVIEW LETTERS
卷 102, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.091803
关键词
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资金
- DOE and NSF (U.S.)
- NSERC ( Canada)
- CEA and CNRS-IN2P3 ( France)
- BMBF and DFG ( Germany)
- INFN ( Italy)
- FOM ( The Netherlands)
- Science and Technology Facilities Council [ST/F008015/1, PP/E000444/1, ST/H000992/1, ST/H001166/1, ST/H000887/1] Funding Source: researchfish
- STFC [ST/H000992/1, ST/H000887/1, ST/H001166/1, ST/F008015/1] Funding Source: UKRI
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.
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