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

Malik, Sarah Alam; Watt, Graeme

doi:10.1007/JHEP02(2014)025

Title: Ratios of W and Z cross sections at large boson $$p_T$$ as a constraint on PDFs and background to new physics

Journal Article · Wed Feb 05 00:00:00 EST 2014 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP02(2014)025· OSTI ID:1226265

Malik, Sarah Alam ^[1]; Watt, Graeme ^[2]

Rockefeller Univ., New York, NY (United States)
Universitat Zurich (Switzerland)

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 also 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(→ νν¯) + jets background in searches for new physics at the LHC. Furthermore, 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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Research Organization:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1226265

Report Number(s):: FERMILAB-PUB-13-106-PPD; arXiv eprint number arXiv:1304.2424

Journal Information:: Journal of High Energy Physics (Online), Vol. 2014, Issue 25; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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