The isospin asymmetries of B -> K (∗) mu+ mu- decays and the partial branching fractions of B0 -> K0 mu+ mu- and B+ -> K∗+ mu+ mu- 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 -> K mu+ mu− isospin asymmetry integrated over q2 is negative, deviating from zero with over 4 σ 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 -> KS mu+ mu- is reported with 5.7 sigma significance. Assuming that the branching fraction of B0 -> K0 mu+ mu- is twice that of B 0 → KS mu+ mu- , the branching fractions of B0 -> K0 mu+ mu- and B -> K∗+ mu+ mu- are found to be (0.31+0.07-0.06)x10-6 and (1.16+-0.19)x10-6, respectively.

Measurement of the isospin asymmetry in B -> K(*) mu+ mu- decays / R., A., C., A.B., A., A., B., A., M., A., C., A., A., A., Z., A., J., A., F., A., M., A., S., A., G., A., P., A.C., A. A., A., S., A., Y., A., J., A., R. B., A., O., A.G., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - STAMPA. - 2012:7(2012), pp. 133-133-19. [10.1007/JHEP07(2012)133]

Measurement of the isospin asymmetry in B -> K(*) mu+ mu- decays

BIZZETI, Andrea;
2012

Abstract

The isospin asymmetries of B -> K (∗) mu+ mu- decays and the partial branching fractions of B0 -> K0 mu+ mu- and B+ -> K∗+ mu+ mu- 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 -> K mu+ mu− isospin asymmetry integrated over q2 is negative, deviating from zero with over 4 σ 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 -> KS mu+ mu- is reported with 5.7 sigma significance. Assuming that the branching fraction of B0 -> K0 mu+ mu- is twice that of B 0 → KS mu+ mu- , the branching fractions of B0 -> K0 mu+ mu- and B -> K∗+ mu+ mu- are found to be (0.31+0.07-0.06)x10-6 and (1.16+-0.19)x10-6, respectively.
2012
2012
7
133
133-19
Measurement of the isospin asymmetry in B -> K(*) mu+ mu- decays / R., A., C., A.B., A., A., B., A., M., A., C., A., A., A., Z., A., J., A., F., A., M., A., S., A., G., A., P., A.C., A. A., A., S., A., Y., A., J., A., R. B., A., O., A.G., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - STAMPA. - 2012:7(2012), pp. 133-133-19. [10.1007/JHEP07(2012)133]
R., Aaij; C., Abellan Beteta; A., Adametz; B., Adeva; M., Adinolfi; C., Adrover; A., Affolder; Z., Ajaltouni; J., Albrecht; F., Alessio; M., Alexander...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/812733
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