Measurement of the ratio of inclusive cross sections σ ( p p ¯ → Z + b − quark jet ) / σ ( p p ¯ → Z + jet ) at s = 1.96 TeV D Boline , A L Lyon , R Lunagarcia , H J Lubatti , Peter Love , M Lokajicek , A Lobodenko , Z Liu , Y Liu , R Lipton , V V Lipaev , J Linnemann , D Lincoln , J K Lim , S M Lietti , Q Z Li , Li Li , J Lellouch , W M Lee , S W Lee , H S Lee , P Lebrun , G Landsberg , S Lammers , J Kvita , V A Kuzmin , T Kurca , A Kupco , Ashok Kumar , J Kraus , A V Kozelov , J M Kohli , M H Kirby , D Khatidze , Y N Kharzheev , A Kharchilava , A Khanov , N Khalatyan , S Kermiche , R Kehoe , I Katsanos , P A Kasper , D Karmanov , E Kajfasz , K Kaadze , A Juste , J Joshi , P Jonsson , A Jonckheere , David Johnston , Mark A Johnson , K Johns , R Jesik , David Olivier Jamin , S K Jain , M Jaffre , S Jabeen , A S Ito , R Illingworth , I Iashvili , V Hynek , N Huske , Z Hubacek , S Hossain , M Hohlfeld , B Hoeneisen , J D Hobbs , T Hoang , R Hirosky , M D Hildreth , G Hesketh , K Herner , 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摘要
The ratio of the cross section for pp 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{sup -1} of pp collisions collected with the D0 detector at the Fermilab Tevatron collider at {radical}(s)=1.96 TeV. The Z{yields}l{sup +}l{sup -} 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{sub T}\u003e20 GeV and pseudorapidity |{eta}|{\u003c=}2.5, which is the most precise to date and is consistent with theoretical predictions.
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