Study of charged particle species produced in association with neutral anti-B mesons, B- mesons, and neutral anti-B(s) mesons in proton-antiproton collisions at center of mass energy= 1.96 TeV.

摘要

We study the yields of charged kaons, charged pions, and protons produced in a association with B mesons produced in proton-antiproton collisions at center of mass energy 1960 GeV using 355 pb-1 of data collected with the CDF detector at the Fermilab Tevatron. This is the first reported measurements of these yields at a hadron collider. The B mesons are reconstructed using the their semileptonic decays: B0→l+D- X,D-→K+p-p -; B0→l+D*-X,D*- →p-D&d1; 0,D&d1;0→K +p-; B+→l+D&d1; 0X,D&d1;0→K +p-; Bs→l+D-s X,D-s→p-f ,f→K+K-.; The K, pi, and p are identified using the Time of Flight detector (TOF), the CDF spectrometer, and the specific ionization (dE/dx) measured in the central drift chamber (COT). The fraction of charged kaons produced in association with B&d1;0s mesons is found to be larger than the fraction produced in association with the B¯0 and B - mesons, as expected from naive models of heavy quark hadronization to mesons. The particle species yields are found to be in qualitative agreement with simulation of B meson production in hadron collisions from the PYTHIA Monte Carlo, although the yield of kaons around B&d1;0s mesons is found to be larger in the simulation when compared to the data. These studies are important for understanding methods of identifying the flavor of B&d1;0s mesons in measurements of B&d1;0s flavor oscillations and charge conjugation-parity (CP) violation in B&d1;0s meson decays.