Measurement of the t-channel single top-quark production cross section in pp collisions at s=7 TeV with the ATLAS detector

ATLAS Collaboration

研究成果: 雜誌貢獻期刊論文同行評審

115 引文 斯高帕斯(Scopus)

摘要

We report a measurement of the cross section of single top-quark production in the t-channel using 1.04 fb−1 of pp collision data at s=7 TeV recorded with the ATLAS detector at the LHC. Selected events feature one electron or muon, missing transverse momentum, and two or three jets, exactly one of them identified as originating from a b quark. The cross section is measured by fitting the distribution of a multivariate discriminant constructed with a neural network, yielding σt=83±4(stat.)−19 +20(syst.) pb, which is in good agreement with the prediction of the Standard Model. Using the ratio of the measured to the theoretically predicted cross section and assuming that the top-quark-related CKM matrix elements obey the relation |Vtb|≫|Vts|,|Vtd|, the coupling strength at the W-t-b vertex is determined to be |Vtb|=1.13−0.13 +0.14. If it is assumed that |Vtb|⩽1 a lower limit of |Vtb|>0.75 is obtained at the 95% confidence level.

原文???core.languages.en_GB???
頁(從 - 到)330-350
頁數21
期刊Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
717
發行號4-5
DOIs
出版狀態已出版 - 31 10月 2012

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