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Measurement of form-factor-independent observables in the decay B0→K*0μ+μ-
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LHCb Collaboration (Including: Back, J. J., Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte, Whitehead, M. (Mark) and Williams, M. P.). (2013) Measurement of form-factor-independent observables in the decay B0→K*0μ+μ-. Physical Review Letters, Volume 111 (Number 19). Article number 191801. doi:10.1103/PhysRevLett.111.191801 ISSN 0031-9007.
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WRAP_LCHb_PhysRevLett.111.191801.pdf - Published Version Available under License Creative Commons Attribution. Download (368Kb) | Preview |
Official URL: http://dx.doi.org/10.1103/PhysRevLett.111.191801
Abstract
We present a measurement of form-factor-independent angular observables in the decay B0→K*(892)0μ+μ-. The analysis is based on a data sample corresponding to an integrated luminosity of 1.0 fb-1, collected by the LHCb experiment in pp collisions at a center-of-mass energy of 7 TeV. Four observables are measured in six bins of the dimuon invariant mass squared q2 in the range 0.1<q2<19.0 GeV2/c4. Agreement with recent theoretical predictions of the standard model is found for 23 of the 24 measurements. A local discrepancy, corresponding to 3.7 Gaussian standard deviations is observed in one q2 bin for one of the observables. Considering the 24 measurements as independent, the probability to observe such a discrepancy, or larger, in one is 0.5%.
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