Observing many-body effects on lepton pair production from low mass enhancement and flow at RHIC and LHC energies

2010/09/30 by Sabyasachi Ghosh, Sourav Sarkar, Jan-e Alam +1
Physics and Astronomy · #Condensed matter physics #Effective mass (spring–mass system) #Formalism (music) #Geometry #High-Energy Particle Collisions Research #Invariant (physics) #Invariant mass #Inverse #Large Hadron Collider #Mass spectrometry #Mass spectrum #Mathematical physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Propagator #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Spectral function #Spectral line #Thermal #Thermodynamics #Transverse mass #Yield (engineering) #nucl-th

paper · pdf · doi:10.1140/epjc/s10052-011-1760-9

openalex publication_date 2011/09/01 · arxiv created 2011/09/14 · arxiv updated 2015/05/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

The ρ spectral function at finite temperature calculated using the real-time formalism of thermal field theory is used to evaluate the low mass dilepton spectra. The analytic structure of the ρ propagator is studied and contributions to the dilepton yield in the region below the bare ρ peak from the different cuts in the spectral function are discussed. The space-time integrated yield shows significant enhancement in the region below the bare ρ peak in the invariant mass spectra. It is argued that the variation of the inverse slope of the transverse mass (M_T) distribution can be used as an efficient tool to predict the presence of two different phases of the matter during the evolution of the system. Sensitivity of the effective temperature obtained from the slopes of the M_T spectra to the medium effects are studied.

Citations

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