HZ associated production at the LHC within the littlest Higgs model at NLO+NLL accuracy

Chen Liang-Wen, Ma Wen-Gan, Zhang Ren-You, Li Xiao-Zhou, and Wang Yong
Phys. Rev. D 94, 074020 – Published 13 October 2016

Abstract

We consider the HZ associated production at the 14 TeV LHC in the littlest Higgs model (LHM) and study the corrections of the transverse momentum resummation and threshold resummation at the next-to-leading logarithmic (NLL) accuracy and the fixed-order prediction at the QCD next-to-leading order (NLO) including the contribution from the one-loop-induced gg-fusion channel. The QCD NLO+NLL effects on the integrated cross section and the distributions of transverse momentum and invariant mass of the HZ system for the HZ production in the LHM are discussed. The distributions of transverse momentum and invariant mass of the HZ system are evaluated by means of the transverse momentum resummation and threshold resummation, respectively. We estimate their scale uncertainties and find that the predictions obtained at the QCD NLO+NLL accuracy are much more reliable than those using the pure NLO approach. We see also that the relative deviation between the results in the LHM and the standard model is considerably reduced by the resummation effects, but still observable.

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  • Received 27 June 2016

DOI:https://doi.org/10.1103/PhysRevD.94.074020

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Chen Liang-Wen, Ma Wen-Gan, Zhang Ren-You*, Li Xiao-Zhou, and Wang Yong

  • Department of Modern Physics, University of Science and Technology of China (USTC), Hefei, Anhui 230026, People’s Republic of China

  • *Corresponding author. zhangry@ustc.edu.cn

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Vol. 94, Iss. 7 — 1 October 2016

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