Scale dependence of open cc¯ and bb¯ production in the low x region

Oliveira, E.G. de; Martin, A.D.; Ryskin, M.G.

doi:10.1140/epjc/s10052-017-4750-8

Scale dependence of open cc¯ and bb¯ production in the low x region

Oliveira, E.G. de; Martin, A.D.; Ryskin, M.G.

Authors

E.G. de Oliveira

A.D. Martin

M.G. Ryskin

Abstract

The ‘optimal’ factorization scale μ0μ0 is calculated for open heavy quark production. We find that the optimal value is μF=μ0≃0.85p2T+m2Q−−−−−−−√μF=μ0≃0.85pT2+mQ2 ; a choice which allows us to resum the double-logarithmic, (αslnμ2Fln(1/x))n(αsln⁡μF2ln⁡(1/x))n corrections (enhanced at LHC energies by large values of ln(1/x)ln⁡(1/x) ) and to move them into the incoming parton distributions, PDF (x,μ20)(x,μ02) . Besides this result for the single inclusive cross section (corresponding to an observed heavy quark of transverse momentum pTpT ), we also determined the scale for processes where the acoplanarity can be measured; that is, events where the azimuthal angle between the quark and the antiquark may be determined experimentally. Moreover, we discuss the important role played by the 2→22→2 subprocesses, gg→QQ¯gg→QQ¯ at NLO and higher orders. In summary, we achieve a better stability of the QCD calculations, so that the data on cc¯cc¯ and bb¯bb¯ production can be used to further constrain the gluons in the small x, relatively low scale, domain, where the uncertainties of the global analyses are large at present.

Citation

Oliveira, E. D., Martin, A., & Ryskin, M. (2017). Scale dependence of open cc¯ and bb¯ production in the low x region. The European Physical Journal C, 77(3), Article 182. https://doi.org/10.1140/epjc/s10052-017-4750-8

Journal Article Type	Article
Acceptance Date	Mar 9, 2017
Online Publication Date	Mar 22, 2017
Publication Date	Mar 22, 2017
Deposit Date	May 25, 2017
Publicly Available Date	May 31, 2017
Journal	European Physical Journal C: Particles and Fields
Print ISSN	1434-6044
Electronic ISSN	1434-6052
Publisher	SpringerOpen
Peer Reviewed	Peer Reviewed
Volume	77
Issue	3
Article Number	182
DOI	https://doi.org/10.1140/epjc/s10052-017-4750-8

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© The Author(s) 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Funded by SCOAP3.