用户名： 密码： 验证码：
Light-quark and gluon jet discrimination in \(pp\) collisions at
详细信息    查看全文
文摘
A likelihood-based discriminant for the identification of quark- and gluon-initiated jets is built and validated using 4.7?fb \(^{-1}\) of proton–proton collision data at \(\sqrt{s}=7\) ? \(\mathrm {\ TeV}\) collected with the ATLAS detector at the LHC. Data samples with enriched quark or gluon content are used in the construction and validation of templates of jet properties that are the input to the likelihood-based discriminant. The discriminating power of the jet tagger is established in both data and Monte Carlo samples within a systematic uncertainty of \(\approx \) 10-0?%. In data, light-quark jets can be tagged with an efficiency of \(\approx 50\,\%\) while achieving a gluon-jet mis-tag rate of \(\approx 25\,\%\) in a \(p_{\mathrm {T}}\) range between \(40\mathrm {\ GeV}\) and \(360\mathrm {\ GeV}\) for jets in the acceptance of the tracker. The rejection of gluon-jets found in the data is significantly below what is attainable using a Pythia?6 Monte Carlo simulation, where gluon-jet mis-tag rates of 10?% can be reached for a 50?% selection efficiency of light-quark jets using the same jet properties.

© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号

地址：北京市海淀区学院路29号 邮编：100083

电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700