Measurement Of ?_b~0 Differential Production Cross-section In (?)=13 TeV Pp Collisions At LHCb Using ?_b~0?J/?pK~- Decay

Studying the characteristics of the cross-section of b hadrons to test the factorization hypothesis could improve our understanding of the production mechanism of heavy hadrons.The ground state of the b-baryon family,?b0,has a wide range of decay modes,providing a complementary to the b-meson decay studies.Furthermore,it can also provide an area to study CP violation in baryon decays.In this analysis,the decay channel ?b0?J/?pK-is used to measure the differential cross-section of ?b0 times decay branching fraction of the decay ?b0?J/?pK-as function of pT and y,with a data sample corresponding to an integrated luminosity of 3.05 fb-1 collected by the LHCb experiment in pp collisions at a center-of-mass energy(?)=13 TeV in 2016,2017 and 2018.We use ?b0 with transverse momentum pT<20 GeV in the rapidity region 2.0<y<4.5.And the signal yield of ?b0?J/?pK-in each pT and y bin is determined by an unbinned maximum likelihood fit to the invariant mass distribution of the reconstructed ?b0 candidates.MC sample of ?b0?J/?pK-is used to estimate the efficiencies.Currently,only statistical uncertainties are estimated.Systematical uncertainty sources are identified and will be further studied.