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Ratios of W and Z cross sections at large boson p T as a constraint on PDFs and background to new physics

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  • Published: 05 February 2014
  • Volume 2014, article number 25, (2014)
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Journal of High Energy Physics Aims and scope Submit manuscript
Ratios of W and Z cross sections at large boson p T as a constraint on PDFs and background to new physics
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  • Sarah Alam Malik1 nAff3 &
  • Graeme Watt2 nAff4 

  • 399 Accesses

  • 25 Citations

  • 1 Altmetric

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Abstract

We motivate a measurement of various ratios of W and Z cross sections at the Large Hadron Collider (LHC) at large values of the boson transverse momentum (p T ≳ M W,Z ). We study the dependence of predictions for these cross-section ratios on the multiplicity of associated jets, the boson p T and the LHC centre-of-mass energy. We present the flavour decomposition of the initial-state partons and an evaluation of the theoretical uncertainties. We show that the W + /W − ratio is sensitive to the up-quark to down-quark ratio of parton distribution functions (PDFs), while other theoretical uncertainties are negligible, meaning that a precise measurement of the W + /W − ratio at large boson p T values could constrain the PDFs at larger momentum fractions x than the usual inclusive W charge asymmetry. The W ± /Z ratio is insensitive to PDFs and most other theoretical uncertainties, other than possibly electroweak corrections, and a precise measurement will therefore be useful in validating theoretical predictions needed in data-driven methods, such as using W (→ ℓν) + jets events to estimate the Z(→ ν\( \overline{\nu} \)) + jets background in searches for new physics at the LHC. The differential W and Z cross sections themselves, dσ/dp T , have the potential to constrain the gluon distribution, provided that theoretical uncertainties from higher-order QCD and electroweak corrections are brought under control, such as by inclusion of anticipated next-to-next-to-leading order QCD corrections.

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This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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  1. Sarah Alam Malik

    Present address: High Energy Physics Group, Blackett Laboratory, Imperial College, London, SW7 2BW, U.K.

  2. Graeme Watt

    Present address: Institute for Particle Physics Phenomenology, Durham University, Durham, DH1 3LE, U.K.

Authors and Affiliations

  1. Laboratory of Experimental High Energy Physics, The Rockefeller University, 1230 York Avenue, New York, NY, 10065, U.S.A

    Sarah Alam Malik

  2. Institut für Theoretische Physik, Universität Zürich, Winterthurerstrasse 190, CH-8057, Zürich, Switzerland

    Graeme Watt

Authors
  1. Sarah Alam Malik
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  2. Graeme Watt
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Correspondence to Graeme Watt.

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ArXiv ePrint: 1304.2424

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Malik, S.A., Watt, G. Ratios of W and Z cross sections at large boson p T as a constraint on PDFs and background to new physics. J. High Energ. Phys. 2014, 25 (2014). https://doi.org/10.1007/JHEP02(2014)025

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  • Received: 19 April 2013

  • Revised: 28 November 2013

  • Accepted: 02 January 2014

  • Published: 05 February 2014

  • DOI: https://doi.org/10.1007/JHEP02(2014)025

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Keywords

  • QCD Phenomenology
  • Hadronic Colliders
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