The 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.

Aaij, R., Collaboration, L., Beteta, C., Adametz, A., Adeva, B., Adinolfi, M., et al. (2012). Measurement of the isospin asymmetry in B -> K-(*)mu(+)mu(-) decays. JOURNAL OF HIGH ENERGY PHYSICS(7) [10.1007/JHEP07(2012)133].

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

CALVI, MARTA;KUCHARCZYK, MARCIN;Martinelli, M;PEREGO, DAVIDE LUIGI;
2012

Abstract

The 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.
Articolo in rivista - Articolo scientifico
Heavy flavours, Fundamental symmetries, Hadron Collider
English
2012
7
none
Aaij, R., Collaboration, L., Beteta, C., Adametz, A., Adeva, B., Adinolfi, M., et al. (2012). Measurement of the isospin asymmetry in B -> K-(*)mu(+)mu(-) decays. JOURNAL OF HIGH ENERGY PHYSICS(7) [10.1007/JHEP07(2012)133].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/51059
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