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dc.contributor.advisor Corcoran, Marjorie D
dc.creatorHogan, Julie M
dc.date.accessioned 2016-01-25T21:56:23Z
dc.date.available 2016-01-25T21:56:23Z
dc.date.created 2015-05
dc.date.issued 2015-02-06
dc.date.submitted May 2015
dc.identifier.citation Hogan, Julie M. "Measurement of the Forward-Backward Asymmetry in the Production of B+ Mesons in p p-bar Collisions." (2015) Diss., Rice University. https://hdl.handle.net/1911/88127.
dc.identifier.urihttps://hdl.handle.net/1911/88127
dc.description.abstract We present a measurement of the forward-backward asymmetry in the production of B+ mesons, A_FB(B+), using B+ -> J/psi K+ decays in 10.4 inverse femtobarns of p p-bar collisions at sqrt(s) = 1.96 TeV collected by the D0 experiment during Run II of the Tevatron collider. A nonzero asymmetry would indicate a preference for a particular flavor, i.e., b quark or b-bar antiquark, to be produced in the direction of the proton beam. We extract A_FB(B+) from a maximum likelihood fit to the difference between the numbers of forward- and backward-produced B+ mesons, using a boosted decision tree to reduce background. Corrections are made for reconstruction asymmetries of the decay products. We measure an asymmetry consistent with zero: A_FB(B+) = [-0.24 +/- 0.41(stat) +/- 0.19(syst)]%. The standard model estimate from next-to-leading-order Monte Carlo is A_FB(B+) = [2.31 +/- 0.34(stat.) +/- 0.51(syst.)]%. There is a difference of approximately 3 standard deviations between this prediction and our result, which suggests that more rigorous determination of the standard model prediction is needed to interpret these results.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subjectparticle physics
forward-backward asymmetry
b quark
B meson
dc.title Measurement of the Forward-Backward Asymmetry in the Production of B+ Mesons in p p-bar Collisions
dc.contributor.committeeMember Geurts, Frank
dc.contributor.committeeMember Semmes, Stephen
dc.date.updated 2016-01-25T21:56:24Z
dc.type.genre Thesis
dc.type.material Text
thesis.degree.department Physics and Astronomy
thesis.degree.discipline Natural Sciences
thesis.degree.grantor Rice University
thesis.degree.level Doctoral
thesis.degree.name Doctor of Philosophy


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