Abstract
We review our recent findings on electromagnetic (EM) effects in Ar+Sc and Pb+Pb collisions at CERN SPS energies, and discuss them in the context of our earlier results on the EM splitting of π+/π- meson directed flow. A specific space-time picture emerges, on the basis of which we construct a simple model of the collision. Starting from local energy and momentum conservation, we nicely describe the centrality dependence of π meson rapidity distributions in Pb+Pb collisions at $\rad{}{s_{NN} } = 17.3\,{\rm{GeV}}$. We discuss the resulting implications on the role of energy and momentum conservation for the dynamics of meson production in A+A collisions. We present our conclusions on the link between the initial stages of the nuclear collision and the final state observables connected to strong and electromagnetic phenomena in charged meson emission. We also discuss the possibility to use the latter EM phenomena to obtain new insight into the spectator space-time evolution and excitation energy.
Highlights
We discuss the recent results of our research programme of phenomenological and experimental studies of electromagnetic (EM) effects, obtained in nuclear collisions in the CERN SPS and RHIC BES energy regime
New information has recently been obtained on EM effects in Ar+Sc collisions, on the role of energy-momentum conservation in the longitudinal evolution of the system in Pb+Pb collisions, and on the fragmentation of the spectator system in both reactions
Taken together with information obtained from heavy ion data, the distance between the π meson emitted at freeze-out and the spectator system decreases rapidly with increasing pion rapidity
Summary
We discuss the recent results of our research programme of phenomenological and experimental studies of electromagnetic (EM) effects, obtained in nuclear collisions in the CERN SPS and RHIC BES energy regime The aim of this programme is to provide new information on the space-time evolution of the reaction by studying the spectator-induced EM effects on charged meson emission (see, e.g., [1]). First data on the spectator-induced electromagnetic (EM) distortion [2] of charged pion r√astiNoNs=h1a6v.e8 been GeV obtained for Ar+Sc collisions at 150A GeV/c beam momentum, that is, [3] Taken together with information obtained from heavy ion data, the distance between the π meson emitted at freeze-out and the spectator system decreases rapidly with increasing pion rapidity
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
