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Measurement of the fraction of tt¯ production via gluon-gluon fusion in pp¯ collisions at s=1.96 TeV
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(2009) Measurement of the fraction of tt¯ production via gluon-gluon fusion in pp¯ collisions at s=1.96 TeV. Physical Review D, Vol. 79 (No. 3). doi:10.1103/PhysRevD.79.031101 ISSN 1550-7998.
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Official URL: http://dx.doi.org/10.1103/PhysRevD.79.031101
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-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.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Physical Review D | ||||
| Publisher: | American Physical Society | ||||
| ISSN: | 1550-7998 | ||||
| Official Date: | 2009 | ||||
| Dates: |
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| Volume: | Vol. 79 | ||||
| Number: | No. 3 | ||||
| DOI: | 10.1103/PhysRevD.79.031101 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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