“School of Particles And Accelerator”

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Paper   IPM / Particles And Accelerator / 13972
School of Particles and Accelerator
  Title:   Global fits to bs ll data and signs for lepton non-universality
1.  Tobias Hurth
2.  Farvah Mahmoudi
3.  Siavash Neshatpour
  Status:   Published
  Journal: JHEP
  No.:  053
  Vol.:  1412
  Year:  2014
  Supported by:  IPM
There are some slight tensions with the SM predictions within the latest LHCb measurements. Besides the known anomaly in one angular observable of the rare decay BK* μ+μ, another small discrepancy recently occurred. The ratio RK = BR(B+K+ μ+ μ) / BR(B+K+ e+ e) in the low-q2 region has been measured by LHCb showing a 2.6σ deviation from the SM prediction. In contrast to the anomaly in the rare decay BK* μ+μ which is affected by power corrections, the ratio RK is theoretically rather clean. We analyse all the bs ll data with global fits and in particular explore the possibility of breaking of lepton universality. Possible cross-checks with an analysis of the inclusive BXs l+l decay are also explored

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