Measurement of the B meson differential cross-sections in p anti p collisions at √s = 1.8 TeV using the exclusive decays B± → J/ψK± and B0 → J/ψK*0

This paper presents the first measurement of the differential B± and B0 cross-sections, dσ/dpΤ, in p anti p collisions at √s = 1.8 TeV. The data sample used represents an integrated luminosity of 19.3 ± 0.8 pb-1 accumulated by the Collider Detector at Fermilab (CDF). The cross-sections are measured over the pT range 6--15 GeV/c in the central pseudorapidity region |η| < 1 by fully reconstructing the B meson decays B± → J/ψK± and B0 → J/ψK*0, where the J/ψ is required to decay to two muons, and the K*0 is required to decay to K±π-+. The measured absolute normalization and shape of the cross-section as a function of pΤ are compared to the theoretical QCD prediction calculated at next-to-leading order