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“School of Particles And Accelerator”

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Paper   IPM / Particles And Accelerator / 15621
School of Particles and Accelerator
  Title:   On lepton non-universality in exclusive bs ll decays
  Author(s): 
1.  Tobias Hurth
2.  Farvah Mahmoudi
3.  Diego Martínez Santos
4.  Siavash Neshatpour
  Status:   Published
  Journal: Phys. Rev. D
  No.:  9, 095034
  Vol.:  96
  Year:  2017
  Supported by:  IPM
  Abstract:
The LHCb measurements of certain ratios of decay modes testing lepton flavour non-universality might open an exciting world of new physics beyond the standard model. The latest LHCb measurements of RK* offer some new insight beyond the previous measurement of RK. We work out the present significance for non-universality, and argue that claims of 5σ deviations from the Standard Model based on all present bs l+l data including the ratios are misleading and are at present still based on guesstimates of hadronic power corrections in the bs l+l angular observables.
We demonstrate that only a small part of the luminosity of 50 fb−1 foreseen to be accumulated by the LHCb will be needed to offer soon a definite answer to the present question of whether we see a very small glimpse of lepton flavour non-universal new physics or not.
We also present new predictions for other ratios based on our analysis of the present measurements of the ratios RK(*) and analyse if they are able to differentiate between various new physics options within the effective field theory at present or in the near future.


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