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Title
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Measurement of the fraction of production via gluon-gluon fusion in collisions at =1.96 TeV
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Author
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Institution/Organisation
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CDF Collaboration
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Abstract
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| 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-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=0.07-0.07+0.15. |
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Language
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English
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Source (journal)
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Physical review : D : particles, fields, gravitation, and cosmology / American Physical Society. - Ridge, N.Y., 2004 - 2015
Physical review : D : particles and fields. - Lancaster, Pa, 1970 - 2003
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Publication
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Ridge, N.Y.
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American Physical Society
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2009
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ISSN
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1550-7998
[print]
1550-2368
[online]
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DOI
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10.1103/PHYSREVD.79.031101
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Volume/pages
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79
:3
(2009)
, p. 031101,1-031101,8
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ISI
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000263816600001
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Full text (Publisher's DOI)
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Full text (open access)
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