Probing proton intrinsic charm in photon or Z boson production accompanied by heavy jets at LHC

Abstract

We consider an observable very sensitive to the non-zero intrinsic charm (IC) contribution to the proton density. It is the ratio between the differential cross sections of the photon or $Z$-boson and $c$-jet production in the $pp$ collision, $\gamma (Z)+c$, and the $\gamma (Z)$ and the $b$-jet production. It is shown that this ratio can be approximately flat or increasing at large $\gamma (Z)$ transverse momenta $p_T$ and their pseudo-rapidities $1.5<\eta <2.4$ if the IC contribution is taken into account. On the contrary, in the absence of the IC this ratio decreases as $p_T$ grows. We also present the ratios of the cross sections integrated over $p_T$ as a function of the IC probability $w$. It is shown that these ratios are mostly independent on the theoretical uncertainties, and such predictions could therefore be much more promising for the search for the intrinsic charm signal at the LHC compared to the predictions for $p_T$-spectra, which significantly depend on these uncertainties.

17 pages, 9 figures

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• Measurement of the differential photon+ c-jet cross section and the ratio of differential photon+ c and photon+ b cross sections in proton-antiproton collisions at sqrt(s) = 1.96 TeV
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Cited by in corpus (11)

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• Intrinsic charm in the nucleon and charm production at large rapidities in collinear, hybrid and $k_T$-factorization approaches
• NNLO QCD predictions for Z-boson production in association with a charm jet within the LHCb fiducial region
• Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s}=$ 8 TeV
• The Physics of Heavy Quark Distributions in Hadrons: Collider Tests
• Hard production of a Z boson plus heavy flavor jets at LHC and the intrinsic charm content of a proton
• Parton distribution functions and constraints on the intrinsic charm content of the proton using BHPS approach
• Impact of the LHCb $p+{}^{4}He$ fixed-target $D^0/\overline{D^0}$ data on the intrinisic $c\bar{c}$ component in the nucleon
• Impact of Beauty and Charm H1-ZEUS Combined Measurements on PDFs and Determination of the Strong Coupling
• Probing the proton structure with associated vector boson and heavy flavor jet production at the LHC