Role of tensor operators in RK and RK

Debjyoti Bardhan, Pritibhajan Byakti, Diptimoy Ghosh

Research output: Contribution to journalArticlepeer-review

48 Scopus citations


The recent LHCb measurement of RK in two q2 bins, when combined with the earlier measurement of RK, strongly suggests lepton flavour non-universal new physics in semi-leptonic B meson decays. Motivated by these intriguing hints of new physics, several authors have considered vector, axial vector, scalar and pseudo scalar operators as possible explanations of these measurements. However, tensor operators have widely been neglected in this context. In this paper, we consider the effect of tensor operators in RK and RK. We find that, unlike other local operators, tensor operators can comfortably produce both of RK low and RK central close to their experimental central values. However, a simultaneous explanation of RK is not possible with only Tensor operators, and other vector or axial vector operators are needed. In fact, we find that combination of vector and tensor operators can provide simultaneous explanations of all the anomalies comfortably at the 1σ level, a scenario which is hard to achieve with only vector or axial vector operators. We also comment on the compatibility of the various new physics solutions with the measurements of the inclusive decay Bd→Xs+.

Original languageEnglish
Pages (from-to)505-512
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
StatePublished - 10 Oct 2017
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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