The physics of Heavy Quark Distributions in Hadrons: Collider Tests

Lykasov, G. I.; Stepanenko, Yu. Yu.; Lipatov, A. V.

Report/Contribution to a conference proceedings/Contribution to a book

PUBDB-2017-06837

The physics of Heavy Quark Distributions in Hadrons: Collider Tests

Lykasov, G. I. ; Lipatov, A. V. ; Stepanenko, Y. Y.

2017
Verlag Deutsches Elektronen-Synchrotron Hamburg
ISBN: 978-3-945931-07-3, 978-3-945931-07-3

Lykasov, G. I. "The physics of Heavy Quark Distributions in Hadrons: Collider Tests" in Proceedings of the Helmholtz International Summer School 2016 (HQ 2016) : Quantum Field Theory at the Limits : from Strong Fields to Heavy Quarks / Ali, Ahmed, Blaschke, David, Issadykov, Aidos, Ivanov, Mikhail (eds.), Verlag Deutsches Elektronen-Synchrotron : 2017 ; HQ 2016 : Helmholtz International Summer School 2016, 2016-07-18 - 2016-07-30, Dubna
Quantum Field Theory at the Limits, HQ 2016, Dubna, Russia, 18 Jul 2016 - 30 Jul 2016 Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-PROC 275-285 (2017) [10.3204/DESY-PROC-2016-04/Lykasov]

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Please use a persistent id in citations: doi:10.3204/DESY-PROC-2016-04/Lykasov

Report No.: DESY-PROC-2016-04

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.

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