Prospects for the extraction of |gn _cb| fromB _c →J/ψμ ⁺ ν decays at LHC

Abstract

We discuss the possibility of extracting |ν _cb| from the future measurement at LHC of theB _c→J/ψμ ⁺ ν decay rate followed by theleptonic decayJ/ψ→μ ⁺ μ ⁻. We examine in detail the influence of the measurement of the muons’ momenta and vertex reconstruction in the final uncertainty of |ν _cb|, as well as the required theoretical inputs at both the production and weak decay level, and their reliability in this regard. We stress the relevance of a rigorous description of the fragmentation contributions to inclusive production at large transverse momentum of heavy quarkonia inpp collisions.