Measurement of the production cross section of a W boson in association with two b jets in pp collisions at 1"> \(\sqrt{s} = 8{\,\mathrm{{TeV}}} \)

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• 作者：V. Khachatryan ; A. M. Sirunyan ; A. Tumasyan ; W. Adam…
• 刊名：The European Physical Journal C
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：77
• 期：2
• 全文大小：1459KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Elementary Particles, Quantum Field Theory; Nuclear Physics, Heavy Ions, Hadrons; Quantum Field Theories, String Theory; Measurement Science and Instrumentation; Astronomy, Astrophysics and Cosmology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1434-6052
• 卷排序：77

文摘

The production cross section of a W boson in association with two b jets is measured using a sample of proton–proton collisions at \(\sqrt{s} = 8{\,\mathrm{{TeV}}} \) collected by the CMS experiment at the CERN LHC. The data sample corresponds to an integrated luminosity of 19.8\(\,\text {fb}^\text {-1}\). The W bosons are reconstructed via their leptonic decays, \(\mathrm {W}\rightarrow \ell \nu \), where \(\ell =\mu \) or \(\mathrm {e}\). The fiducial region studied contains exactly one lepton with transverse momentum \(p_{\mathrm {T}} ^{\ell }>30\,\mathrm{{GeV}} \) and pseudorapidity \(|\eta ^{\ell } |<2.1\), with exactly two b jets with \(p_{\mathrm {T}} >25\,\mathrm{{GeV}} \) and \(|\eta |<2.4\) and no other jets with \(p_{\mathrm {T}} >25\,\mathrm{{GeV}} \) and \(|\eta |<4.7\). The cross section is measured to be \(\sigma ( {{\mathrm {p}\mathrm {p}}} \rightarrow {\mathrm {W}} (\ell \nu )\)+\({\mathrm{{b}}\mathrm{{\overline{b}}}})= 0.64 \pm 0.03{\,\mathrm{{(stat)}}} \pm 0.10{\,\mathrm{{(syst)}}} \pm 0.06{\,\mathrm{{(theo)}}} \pm 0.02{\,\mathrm{{(lumi)}}}\,{\text {pb}}\), in agreement with standard model predictions.