TY - JOUR
T1 - Measurement of the isospin asymmetry in B→K(∗)μ+μ− decays.
AU - Playfer, Stephen
AU - The LHCb Collaboration
AU - Needham, Matthew
AU - Muheim, Franz
AU - Clarke, Peter
AU - Xie, Yuehong
AU - Eisenhardt, Stephan
PY - 2012/7
Y1 - 2012/7
N2 - The isospin asymmetries of B→K(∗)μ+μ− decays and the partial branching fractions of B0→K0μ+μ− and B+→K∗+μ+μ− are measured as a function of the di-muon mass squared q2 using an integrated luminosity of 1.0 fb−1 collected with the LHCb detector. The B→Kμ+μ− isospin asymmetry integrated over q2 is negative, deviating from zero with over 4 σ significance. The B→K∗μ+μ− decay measurements are consistent with the Standard Model prediction of negligible isospin asymmetry. The observation of the decay B0→K0Sμ+μ− is reported with 5.7 σ significance. Assuming that the branching fraction of B0→K0μ+μ− is twice that of B0→K0Sμ+μ−, the branching fractions of B0→K0μ+μ− and B→K∗+μ+μ− are found to be (0.31+0.07−0.06)×10−6 and (1.16±0.19)×10−6, respectively.
AB - The isospin asymmetries of B→K(∗)μ+μ− decays and the partial branching fractions of B0→K0μ+μ− and B+→K∗+μ+μ− are measured as a function of the di-muon mass squared q2 using an integrated luminosity of 1.0 fb−1 collected with the LHCb detector. The B→Kμ+μ− isospin asymmetry integrated over q2 is negative, deviating from zero with over 4 σ significance. The B→K∗μ+μ− decay measurements are consistent with the Standard Model prediction of negligible isospin asymmetry. The observation of the decay B0→K0Sμ+μ− is reported with 5.7 σ significance. Assuming that the branching fraction of B0→K0μ+μ− is twice that of B0→K0Sμ+μ−, the branching fractions of B0→K0μ+μ− and B→K∗+μ+μ− are found to be (0.31+0.07−0.06)×10−6 and (1.16±0.19)×10−6, respectively.
U2 - 10.1007/JHEP07(2012)133
DO - 10.1007/JHEP07(2012)133
M3 - Article
SN - 1029-8479
VL - 2012
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 7
M1 - 133
ER -