CTEQ-TEA parton distribution functions with intrinsic charm

¹ Department of Physics, Kennesaw State University, 370 Paulding Ave., 30144 Kennesaw, GA, U.S.A.
² National Tsing Hua University, Hsinchu City, Taiwan.
³ School of Physics Science and Technology & Center for Theoretical Physics, Xinjiang University, Urumqi, Xinjiang 830046 China.
⁴ INPAC, Shanghai Key Laboratory for Particle Physics and Cosmology & School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
⁵ Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824 U.S.A.
⁶ Department of Physics, Southern Methodist University, Dallas, TX 75275-0181, U.S.A.

^* e-mail: mguzzi@kennesaw.edu

Published online: 14 November 2018

Abstract

We present a study in which the possibility of a (sizable) nonperturbative contribution to the charm parton distribution function (PDF) in a nucleon is investigated together with theoretical issues arising in its interpretation. The separation of the universal component of the nonperturbative charm from the rest of the radiative contributions is also discussed. We illustrate the potential impact of a nonperturbative charm PDF on LHC scattering processes. An estimate of nonperturbative charm magnitude in the CT14 and CT14HERA2 global QCD analyses at the next-to-next-to leading order (NNLO) in the QCD coupling strength is given by including the latest experimental data from HERA and the Large Hadron Collider. We show a comparison between different models of intrinsic charm and illustrate prospects for standard candle observables at the LHC.