2017/06/21 by H. Fujii, K. Watanabe, Fujii, Hirotsugu +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.1706.06728
openalex publication_date 2017/06/21 · openalex created_date 2017/06/30 · openalex updated_date 2026/07/28
We study nuclear modification factors for single D meson and semileptonic decay lepton l (=e,μ) production in minimum bias proton-nucleus (pA) collisions at the LHC in the color-glass-condensate (CGC) framework at leading order in strong coupling. In our numerical computations, transverse momentum (k_⊥) dependent multi-point Wilson line correlators are employed for describing target nucleus for pA and proton for pp. The projectile proton is treated with unintegrated gluon distribution function, which is also k_⊥-dependent. The rapidity evolutions of these functions in the small Bjorken x region are taken into account by solving running coupling Balitsky-Kovchegov (BK) equation at leading logarithmic accuracy. For simplicity, we employ Kartvelishvili's type fragmentation function and a simple model for lepton energy distribution from seileptonic decay, respectively, to compute differential cross sections for D and l production. The gluon saturation scale inside the heavy nucleus is enhanced and dependent on x, which we take into account by replacing the initial saturation scale in the BK equation with a larger value for the heavy nucleus. We show that the saturation effect leads to perceptible nuclear suppression of D production at forward rapidity. Our numerical results predict similar nuclear suppressions in pA collisions for forward l production at lower transverse momentum p_⊥<2 \rm GeV. Numerical tables on the nuclear modifications of D and l are listed in this note.