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Collider Cross Talk
Differential branching fractions and isospin asymmetries of B -> K* mu+ mu- decays
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Europe/Zurich
4/2-011 - TH common room (CERN)
Description
The LHCb experiment has recently updated the analysis on the isospin asymmetry (AI) of B→K(*)µ+µ– decays with 3fb-1 of integrated luminosity collected during 2011 and 2012.
The Standard Model (SM) predicts the AI at O(1%) at low dimuon mass. Previously BABAR, Belle and LHCb collaborations measured a significantly negative AI for low dimuon mass region. In particular the B→Kµ+µ– AI measured by the LHCb experiment with 1fb-1 of integrated luminosity deviates from 0 by over 4 standard deviations.
The new analysis, presented at the Rencontres de Moriond 2014, gave results consistent with the SM, reducing to 1.5 standard deviation the significance of B→Kµ+µ– AI to differ from zero.
However there is still a small tendency for differential branching fractions to have lower values than the SM predicitons.
The Standard Model (SM) predicts the AI at O(1%) at low dimuon mass. Previously BABAR, Belle and LHCb collaborations measured a significantly negative AI for low dimuon mass region. In particular the B→Kµ+µ– AI measured by the LHCb experiment with 1fb-1 of integrated luminosity deviates from 0 by over 4 standard deviations.
The new analysis, presented at the Rencontres de Moriond 2014, gave results consistent with the SM, reducing to 1.5 standard deviation the significance of B→Kµ+µ– AI to differ from zero.
However there is still a small tendency for differential branching fractions to have lower values than the SM predicitons.