| Resumen |
The ratio of the cross section for p¯p interactions producing a Z boson and at least one b quark jet to the inclusive Z+jet cross section is measured using 4.2 fb−1 of p¯p collisions collected with the D0 detector at the Fermilab Tevatron collider at ps = 1.96 TeV. The Z ! ℓ+ℓ− candidate events with at least one b jet are discriminated from Z+ charm and light jet(s) events by a novel technique that exploits the properties of the tracks associated to the jet. The measured ratio is 0.0193±0.0027 for
events having a jet with transverse momentum pT > 20 GeV and pseudorapidity |η| 2.5, which is the most precise to date and is consistent with theoretical predictions. |
