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C.Zhang, Y.Zhelezov, A.Zhong, L.Zvyagin, A.2013-02-272013-02-272013-02-27201210.1007/Jhep07(2012)133https://infoscience.epfl.ch/handle/20.500.14299/89768WOS:000307299800011The isospin asymmetries of B -> K-(*)mu(+)mu(-) decays and the partial branching fractions of B-0 -> K-0 mu(+)mu(-) and B+ -> K*+mu(+)mu(-) are measured as a function of the di-muon mass squared q(2) using an integrated luminosity of 1.0 fb(-1) collected with the LHCb detector. The B -> K mu(+)mu(-) isospin asymmetry integrated over q(2) is negative, deviating from zero with over 4 sigma significance. The B -> K*mu(+)mu(-) decay measurements are consistent with the Standard Model prediction of negligible isospin asymmetry. The observation of the decay B0 -> K-s(0)mu(+)mu(-) is reported with 5.7 sigma significance. Assuming that the branching fraction of B-0 -> K-0 mu(+)mu(-) is twice that of B-0 -> K-s(0)mu(+)mu(-), the branching fractions of B-0 -> K-0 mu(+)mu(-) and B -> K*(+)mu(+)mu(-) it are found to be (0.31(-0.06)(+0.07)) x 10(-6) and (1.16 +/- 0.19) x 10(-6), respectively.Hadron-Hadron Scatteringtext::journal::journal article::research article