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A measurement of the top pair production cross-section in the dilepton channel using lepton plus track selection
| 题名： | A measurement of the top pair production cross-section in the dilepton channel using lepton plus track selection |
| 作者： | /UC, Santa Barbara;Mills, Corrinne Elaine; |
| 关键词： | Experiment-HEP72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCURACY; BRANCHING RATIO; CROSS SECTIONS; DECAY; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; FORECASTING; LEPTONS; PAIR PRODUCTION; PRICES; PRODUCTION; STANDARD MODEL; T QUARKS; TRANSVERSE ENERGY |
| 摘要： | Using 1.1 fb{sup -1} of data collected by the Collider Detector at Fermilab (CDF) from Run II of the Fermilab Tevatron, they measure the t{bar t} production cross section in events with two leptons, significant missing transverse energy, and {ge} 2 jets. As the Run II dataset grows, more stringent tests of Standard Model predictions for the top quark sector are becoming possible. The dilepton channel, where both top quarks decay t {yields} Wb {yields} {ell}{nu}b, is of particular interest due to its high purity even in the absence of a b jet 'tagging' requirement. Use of an isolated track as the second lepton significant increases the dilepton acceptance, at the price of some increase in background, particular from W + jets events where one of the jets is identified as a lepton. With the amount of data available, it has been possible to improve the estimate of the contribution from that background, reflected in a reduced systematic uncertainty. Assuming a branching ratio of BR(W {yields} {ell}{nu}) = 10.8%and a top mass of m{sub t} = 175 GeV/c{sup 2}, the measured cross-section is {sigma}(p{bar p} {yields} t{bar t}) = 8.3 {+-} 1.3(stat.) {+-} 0.7(syst.) {+-} 0.5(lumi.) pb. The result is consistent with the Standard Model prediction of 6.7{sub -0.9}{sup +0.7} pb and represents a significant improvement in precision over previous results using this selection. |
| 总页数： | 214pages |
| 报告类型： | 科技报告 |
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