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.
Highlights
The principle of the global analysis is to use QCD theory to analyze a broad range of experimental data, including precision data from HERA, the Tevatron, and the Large Hadron Collider (LHC)
As new experimental measurements from the LHC grow increasingly precise, novel challenges arise in extracting accurate predictions for the parton content of the proton in global QCD analysis of parton distribution function (PDF) needed for advanced tests of the Standard Model and possible physics beyond the Standard Model
The genuine nonperturbative charm PDF instead, is defined by the means of power counting of radiative contributions to DIS. Assuming that this additional nonperturbative charm component can be factorized like the perturbative charm component, one is able to examine how it differs from the perturbative charm, and how it depends on theoretical inputs in a global QCD analysis of PDFs
Summary
The principle of the global analysis is to use QCD theory to analyze a broad range of experimental data, including precision data from HERA, the Tevatron, and the Large Hadron Collider (LHC). Theoretical predictions for short-distance scattering processes allow the measurement, within some approximations, of universal parton distribution functions (PDFs) for the proton. As new experimental measurements from the LHC grow increasingly precise, novel challenges arise in extracting accurate predictions for the parton content of the proton in global QCD analysis of PDFs needed for advanced tests of the Standard Model and possible physics beyond the Standard Model. A recently published CTEQ-TEA (CT) global analysis of experimental data [1] produced the CT14NNLO PDFs, referred to as the CT14 PDFs. The analysis is based on the next-to-next-to-leading order (NNLO) approximation for perturbative QCD
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