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arXiv · 1802.05085

Hard production of a Z boson plus heavy flavor jets at LHC and the intrinsic charm content of a proton

A. V. Lipatov·G. I. Lykasov·M. A. Malyshev·A. A. Prokhorov·S. M. Turchikhin
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Abstract

The cross section of associated production of a Z boson with heavy flavor jets in $pp$ collisions is calculated using the SHERPA Monte Carlo generator and the analytical combined QCD approach based on kt-factorization at small x and conventional collinear QCD at large x. A satisfactory description of the ATLAS and CMS data on the $p_T$ spectra of Z bosons and c-jets in the whole rapidity, y, region is shown. Searching for the intrinsic charm (IC) contribution in these processes, which could be visible at large y > 1.5, we study observables very sensitive to non-zero IC contributions and less affected by theoretical QCD scale uncertainties. One of such observables is the so-called double ratio: the ratio of the differential cross section of Z + c production in the central region of |y| < 1.5 and in the forward region 1.5 < |y| < 2.5, divided by the same ratio for Z + b production. These observables could be more promising for the search of IC at LHC as compared to the observables considered earlier.

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A. V. Lipatov, G. I. Lykasov, M. A. Malyshev, A. A. Prokhorov, S. M. Turchikhin. 2018-02-14. Hard production of a Z boson plus heavy flavor jets at LHC and the intrinsic charm content of a proton. https://doi.org/10.1103/physrevd.97.114019

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