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Measurement of forward $W→eν$ production in pp collisions at $\sqrt{s} = 8$ TeV


LHCb Collaboration; Bernet, R; Müller, K; Steinkampf, O; Straumann, U; et al (2016). Measurement of forward $W→eν$ production in pp collisions at $\sqrt{s} = 8$ TeV. Journal of High Energy Physics, 2016(10):30.

Abstract

A measurement of the cross-section for $W → eν$ production in pp collisions is presented using data corresponding to an integrated luminosity of 2 $fb^{−1}$ collected by the LHCb experiment at a centre-of-mass energy of $\sqrt{s} = 8$ TeV. The electrons are required to have more than 20 GeV of transverse momentum and to lie between 2.00 and 4.25 in pseudorapidity. The inclusive W production cross-sections, where the W decays to eν, are measured to be
$σ_{W^+}→_{{e^+}{ν_e}}=1124.4±2.1±21.5±11.2±13.0pb$,
$σ_{W^−}→_{{e^+}{\overlineν_e}}=809.0±1.9±18.1±7.0±9.4pb$,
where the first uncertainties are statistical, the second are systematic, the third are due to the knowledge of the LHC beam energy and the fourth are due to the luminosity determination.
Differential cross-sections as a function of the electron pseudorapidity are measured. The $W^+/W^−$ cross-section ratio and production charge asymmetry are also reported. Results are compared with theoretical predictions at next-to-next-to-leading order in perturbative quantum chromodynamics. Finally, in a precise test of lepton universality, the ratio of W boson branching fractions is determined to be
$\mathcal{B}(W→eν)/\mathcal{B}(W→μν)=1.020±0.002±0.019$,
where the first uncertainty is statistical and the second is systematic.

Abstract

A measurement of the cross-section for $W → eν$ production in pp collisions is presented using data corresponding to an integrated luminosity of 2 $fb^{−1}$ collected by the LHCb experiment at a centre-of-mass energy of $\sqrt{s} = 8$ TeV. The electrons are required to have more than 20 GeV of transverse momentum and to lie between 2.00 and 4.25 in pseudorapidity. The inclusive W production cross-sections, where the W decays to eν, are measured to be
$σ_{W^+}→_{{e^+}{ν_e}}=1124.4±2.1±21.5±11.2±13.0pb$,
$σ_{W^−}→_{{e^+}{\overlineν_e}}=809.0±1.9±18.1±7.0±9.4pb$,
where the first uncertainties are statistical, the second are systematic, the third are due to the knowledge of the LHC beam energy and the fourth are due to the luminosity determination.
Differential cross-sections as a function of the electron pseudorapidity are measured. The $W^+/W^−$ cross-section ratio and production charge asymmetry are also reported. Results are compared with theoretical predictions at next-to-next-to-leading order in perturbative quantum chromodynamics. Finally, in a precise test of lepton universality, the ratio of W boson branching fractions is determined to be
$\mathcal{B}(W→eν)/\mathcal{B}(W→μν)=1.020±0.002±0.019$,
where the first uncertainty is statistical and the second is systematic.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:August 2016
Deposited On:27 Dec 2016 13:07
Last Modified:23 Sep 2018 06:03
Publisher:Springer
ISSN:1029-8479
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/JHEP10(2016)030

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