Measurement of the Dependence of the Hadron Production Fraction Ratios f _s/f _u and f _d/f _u on B Meson Kinematic Variables in Proton-Proton Collisions at √s=13 TeV

Authors

A. Tumasyan, CMS Collaboration

Document Type

Article

Date of this Version

9-19-2023

Citation

PHYSICAL REVIEW LETTERS 131, 121901 (2023). DOI: 10.1103/PhysRevLett.131.121901

Comments

Used by permission.

Abstract

The dependence of the ratio between the B⁰_s and B⁺ hadron production fractions, f_s/f_u, on the transverse momentum (p_T) and rapidity of the B mesons is studied using the decay channels B⁰_s → J/ψϕ and B⁺ → J/ψK⁺. The analysis uses a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the CMS experiment in 2018 and corresponding to an integrated luminosity of 61.6 fb⁻¹. The f_s/f_u ratio is observed to depend on the B p_T and to be consistent with becoming asymptotically constant at large p_T. No rapidity dependence is observed. The ratio of the B⁰ to B⁺ meson production fractions, f_d/f_u, is also measured, for the first time in proton-proton collisions, using the B⁰ → J/ψK*⁰ decay channel. The result is found to be within 1 standard deviation of unity and independent of p_T and rapidity, as expected from isospin invariance.