“School of Particles”

Back to Papers Home
Back to Papers of School of Particles

Paper   IPM / Particles / 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.


Download TeX format
back to top
scroll left or right