Measurement of the fraction of t(t)over-bar production via gluon-gluon fusion in p(p)over-bar collisions at root s=1.96 Tev
Name
Aaltonen-2009-Measurement of the f.pdf
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Author(s)
Xie, Si
Knuteson, Bruce O.
Henderson, C.
Hahn, Kristian Allan
Goncharov, Maxim
Gomez-Ceballos, Guillelmo
Choudalakis, Georgios
Makhoul, Khaldoun
Bauer, Gerry P
Date Issued
February 2009
Journal
Physical Review D
Publisher
American Physical Society
Citation
CDF Collaboration et al. “Measurement of the fraction of tt-bar production via gluon-gluon fusion in pp-bar collisions at s=1.96 TeV.” Physical Review D 79.3 (2009): 031101. c2010 American Physical Society.
Version
Final published version
Abstract
We present a measurement of the ratio of the tt̅ production cross section via gluon-gluon fusion to the total tt̅ production cross section in pp̅ collisions at √s=1.96 TeV at the Tevatron. Using a data sample with an integrated luminosity of 955 pb[superscript -1] recorded by the CDF II detector at Fermilab, we select events based on the tt̅ decay to lepton+jets. Using an artificial neural network technique we discriminate between tt̅ events produced via qq̅ annihilation and gg fusion, and find Gf=σ(gg→tt̅ )/σ(pp̅ →tt̅ )<0.33 at the 68% confidence level. This result is combined with a previous measurement to obtain the most stringent measurement of this quantity by CDF to date, Gf=0.07[subscript -0.07][superscript +0.15].
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevD.79.031101
