title: Observation of diffractive b-quark production at the fermilab tevatron
abstract: We report a measurement of the fraction of b quarks produced diffractively in &pmacr;p collisions at sqrt[s] = 1.8 TeV. Diffraction is identified by the absence of particles in a forward pseudorapidity region. From events with an electron of transverse momentum 9.5<p(e)(T)<20 GeV/ c within the pseudorapidity region |eta|<1.1, the ratio of diffractive to total b-quark production rates is found to be R(&bmacr;b) = [0.62+/-0.19(stat)+/-0.16(syst)]%. This result is comparable in magnitude to corresponding ratios for W and dijet production but significantly lower than expectations based on factorization.
authors.affiliation: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.initials: F
authors.lastname: Ukegawa
authors.initials: J
authors.lastname: Valls
authors.initials: S
authors.lastname: Vejcik
authors.initials: G
authors.lastname: Velev
authors.initials: R
authors.lastname: Vidal
authors.initials: R
authors.lastname: Vilar
authors.initials: I
authors.lastname: Vologouev
authors.initials: D
authors.lastname: Vucinic
authors.initials: RG
authors.lastname: Wagner
authors.initials: RL
authors.lastname: Wagner
authors.initials: J
authors.lastname: Wahl
authors.initials: NB
authors.lastname: Wallace
authors.initials: AM
authors.lastname: Walsh
authors.initials: C
authors.lastname: Wang
authors.initials: CH
authors.lastname: Wang
authors.initials: MJ
authors.lastname: Wang
authors.initials: T
authors.lastname: Watanabe
authors.initials: T
authors.lastname: Watts
authors.initials: R
authors.lastname: Webb
authors.initials: H
authors.lastname: Wenzel
authors.initials: WC
authors.lastname: Wester
authors.initials: AB
authors.lastname: Wicklund
authors.initials: E
authors.lastname: Wicklund
authors.initials: HH
authors.lastname: Williams
authors.initials: P
authors.lastname: Wilson
authors.initials: BL
authors.lastname: Winer