2017/07/31 by Peng Ru, Ghulam Bary, Wei‐Ning Zhang +1
Physics and Astronomy · #Anisotropy #Elliptic flow #High-Energy Particle Collisions Research #Momentum (technical analysis) #Nuclear physics #Particle physics theoretical and experimental studies #Physics #Pion #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Spectrum (functional analysis) #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1016/j.physletb.2017.12.013
published as Physics Letters B 777 (2018) 79-85 · 8 pages, 4 figures
openalex created_date 2017/07/31 · openalex publication_date 2017/12/07 · arxiv created 2017/12/13 · arxiv updated 2017/12/15 · openalex updated_date 2026/08/05
In this letter, we study the pion momentum distribution of a coherent source and investigate the influences of coherent emission on the pion transverse-momentum (pT) spectrum and elliptic anisotropy. With a partially coherent source, constructed by a conventional viscous hydrodynamics model (chaotic part) and a parameterized expanding coherent source model, we reproduce the pion pT spectrum and elliptic anisotropy coefficient v2(pT) in the peripheral Pb–Pb collisions at sNN=2.76TeV. It is found that the influences of coherent emission on the pion pT spectrum and v2(pT) are related to the initial size and shape of the coherent source, largely due to the interference effect. However, the effect of source dynamical evolution on coherent emission is relatively small. The results of the partially coherent source with 33% coherent emission and 67% chaotic emission are consistent with the experimental measurements of the pion pT spectrum, v2(pT), and especially four-pion Bose–Einstein correlations.