Work

Tree-level NLO corrections to inclusive ψ ′ production in high energy factorization

Year: 2025

Type: article

Abstract: We consider inclusive ψ ( 2 S ) production in proton-proton collisions at collider energies in the framework of nonrelativistic QCD and high energy factorization beyond the low-order approximation. We utilize a matching scheme proposed earlier to merge the leading-order and tree-level next-to-leading-order (NLO) production amplitudes and now extend it to low transverse momenta and/or forward rapidities. With the improved scheme, we examine the possibility to simultaneously describe all unpolarized LHC data in the full kinematic range accessible to experimental measurements and try different transverse momentum-dependent gluon distributions in the proton. A global fit to the data is carried out to extract the color octet long-distance matrix elements for ψ ( 2 S ) mesons. We show that taking the NLO corrections into account leads to a better description of the data.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/454q-673t

Authors: A. A. Prokhorov, S. P. Baranov, A. V. Lipatov, M. A. Malyshev, X. Chen

Institutions: Joint Institute for Nuclear Research, P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Lomonosov Moscow State University, Moscow Aviation Institute, Institute of Modern Physics, University of Chinese Academy of Sciences

Language: English

Topic: Quantum Chromodynamics and Particle Interactions

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funder: National Key Research and Development Program of China

Awards: G2237148944, G2550026590