According to SM in ppbar collisions of center-of-momentum of about 2 TeV, ttbars are expected to be produced through gluon gluon fusion (~15%) and quark-antiquark annihilation (~85%). In this study, we make a measurement of the ttbar cross section fraction through gg fusion over qqbar annihilation. As in many analyses, this is a test of the SM prediction.
In addition, due to the fact that bbbar production has the same production mechanism as ttbar with gg fusion being the dominant channel and the higher production rate that we observe for bbbar in hadron colliders, one can hypothesize that our understanding of gg fusion is not accurate and therefore a measurement of this process in ttbar production would be very interesting.
Also, there have been some suggestions that even though the ttbar production cross section measured in Run I is in agreement with the SM prediction, there is the possibility of having ttbar production and top quark decay mechanisms beyond SM that would cancel each others effect such that the result would still be consistent with what has been observed in Run I. Thus there is interest in studying the ttbar production mechanisms independent of the ttbar final state channels.
CDF8271 presents the first measurement of sigma(gg->ttbar)/sigma(ppbar->ttbar) using 360 pb-1.
CDF8031 shows the correlation between the average low pt track multiplicity and average number of gluons in a given sample.
CDF6218 is a generator-level study to develop a technique to get the ttbar production through gg fusion rate.
CDF7322 is a look at the energy flow in W+n jets events, comparing data with PYTHIA Tune-A MC.
CDF6698 is a look at the energy flow in ttbar events, comparing ttbar MC with W+3 or more jet events.
BLESS: Study of ttbar Production Mechanism, presented in Top Group meeting on June 08, 2006
Prebless: Study of ttbar Production Mechanism, presented in Top Group meeting on May 25, 2006
Full Status Report: Study of ttbar Production Mechanism, presented in Top Properties meeting on May 19, 2006
Status Report on the Study of ttbar Production Mechanisms, presented in Top Properties meeting on March 03, 2006
Status Report on the Study of ttbar Production Mechanisms, presented in Top Group meeting on Dec 22, 2005
ttbar Production Mechanisms, presented in Top Properties Workshop on November 11, 2005
An Investigation of Top Quark Pair Production Mechanisms, presented in CAP Conference on June 07, 2005
PR Plots: Study of ttbar Production Mechanisms; W and Jet Samples as Calibration, presented in Top Group meeting on May 26, 2005
Update on ttbar Production Mechanisms, presented in Lepton+jets meeting on May 06, 2005
Report on the Study of ttbar Production Mechanisms, presented in Lepton+jets meeting on April 22, 2005
Update on ttbar Production Mechanisms, presented in Lepton+jets meeting on March 11, 2005
Towards a measurement of sigma(gg->ttbar)/sigma(qqbar->ttbar), presented in Lepton+jets meeting on August 13, 2004
UE and OOC Jet Et Contribution in Data and MC for W+n jet(s) Events, presented in Jet Energy Correction meeting on April 28, 2004
Study of the Mechanisms for ttbar Production, presented in Lepton+jets meeting on November 21, 2003