Measurement of the ratio of inclusive cross sections σ(pp̄→ Z+b-quark jet)/σ(pp̄→Z+jet) at √s=1.96TeV

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2011-02-28

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The ratio of the cross section for pp̄ interactions producing a Z boson and at least one b-quark jet to the inclusive Z+jet cross section is measured using 4.2fb-1 of pp̄ collisions collected with the D0 detector at the Fermilab Tevatron collider at √s=1.96TeV. The Z→ + - 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 p T>20GeV and pseudorapidity η≤2.5, which is the most precise to date and is consistent with theoretical predictions. © 2011 American Physical Society.

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Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 83, n. 3, 2011.

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