A new state of hadronic matter at high density |
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| Institution: | 1. Institut für Theoretische Physik, Universität Tübingen, D-72076 Tübingen, Germany;2. Service de Physique Théorique, C.E. Saclay, F-91191 Gif-sur-Yvette Cedex, France;3. Department de Fisica Teòrica, Universitat de València, E-46100 Burjassot València, Spain;1. Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA;2. School of Science, Huzhou University, Huzhou, Zhejiang 313000, China;1. Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, United States of America;2. Brookhaven National Laboratory, Upton, NY 11973, United States of America;3. Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), and Institute of Modern Physics, Fudan University, Shanghai-200433, People''s Republic of China |
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| Abstract: | We propose in this article that if the chemical potential exceeds a critical value in dense hadronic medium, a first-order phase transition to a new state of matter with Lorentz symmetry spontaneously broken (in addition to the explicit breaking) takes place. As a consequence, light vector mesons get excited as “almost” Goldstone bosons. Since the light vector mesons dominantly couple to photons, the presence of these new vector mesons could lead to an enhancement in the dilepton production from dense medium at an invariant mass lower than the free-space vectormeson mass. We provide a low-energy quark model which demonstrates that the above scenario is a generic case for quark theories with a strong interaction in the vector channel. We discuss possible relevance of this phase to the phenomenon of the enhanced dilepton production at low invariant masses in relativistic heavy-ion collisions. |
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