Vector meson radiation in relativistic heavy-ion collisions |
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| Institution: | 1. iTHES Research Group, RIKEN, Wako 351-0198, Japan;2. Department of Physics, Brookhaven National Laboratory, Upton, NY 11973-5000, United States;3. Department of Physics, Sophia University, Tokyo 102-8554, Japan;1. School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China;2. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;3. Department of Physics, McGill University, 3600 University Street, Montreal, QC, H3A 2T8, Canada;4. Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China;5. Institute of Particle Physics (IOPP) and Key Laboratory of Quark and Lepton Physics (MOE), Central China Normal University, Wuhan 430079, China;6. Physics Department and Center for Exploration of Energy and Matter, Indiana University, 2401 N Milo B. Sampson Lane, Bloomington, IN 47408, USA |
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| Abstract: | The (σ, ω) model in the mean-field approximation where the meson fields are treated classically, describes much of observed nuclear structure and has been employed to describe the nuclear equation of state up to the quark-gluon phase transition. The acceleration of the meson sources, for example, in relativistic heavy-ion collisions, should result in bremsstrahlung-like radiation of the meson fields. The many mesons emitted serve to justify the use of classical meson fields. The slowing of the nuclei during the collision is modeled here as a smooth transition from initial to final velocity. Under ultra-relativistic conditions, vector radiation dominates. The angular distribution of energy flux shows a characteristic shape. It appears that if the vector meson field couples to the conserved baryon current, independent of the baryonic degrees of freedom, this mechanism will contribute to the radiation seen in relativistic heavy-ion collisions. The possible influence of the quark-gluon plasma is also considered. |
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