Medium effects in the production and decay of vector mesons in pion-nucleus reactions |
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| Institution: | 1. Institute of Nuclear Research, 117312 Moscow, Russia;2. Institute of Theoretical and Experimental Physics, 117259 Moscow, Russia;3. Institute for Theoretical Physics, University of Giessen, D-35392 Giessen, Germany;1. Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA;2. Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China;3. School of Physical Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China;4. Department of Physics, Center for Theoretical Physics, and Leung Center for Cosmology and Particle Astrophysics, National Taiwan University, Taipei, 106, Taiwan;5. Physics Department, University of Connecticut, Storrs, CT 06269-3046, USA;6. RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, NY 11973, USA;7. Department of Computational Mathematics, Michigan State University, East Lansing, MI 48824, USA;8. Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany;9. Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;1. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;2. Theoretical Division, Group T-2, MS B283, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA;1. KEK Theory Center, Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Oho 1-1, Tsukuba, Ibaraki, 305-0801, Japan;2. J-PARC Branch, KEK Theory Center, Institute of Particle and Nuclear Studies, KEK, and Theory Group, Particle and Nuclear Physics Division, J-PARC Center, Shirakata 203-1, Tokai, Ibaraki, 319-1106, Japan;3. School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, Henan 450001, China;4. CPHT, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau, France;1. IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France;2. Istituto Nazionale di Fisica Nucleare, Sezione di Roma, P. le A. Moro 2, I-00185 Roma, Italy;3. Dpto. Ciencias Integradas, Centro de Estudios Avanzados en Fis., Mat. y Comp., Fac. Ciencias Experimentales, Universidad de Huelva, Huelva 21071, Spain;4. CAFPE, Universidad de Granada, E-18071 Granada, Spain;1. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße. 1, 64291 Darmstadt, Germany;2. Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand;3. Technische Universität Darmstadt, D-64289 Darmstadt, Germany |
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| Abstract: | The ω-, ϱ-, and φ-resonance production and their dileptonic decay in π− A reactions at 1.1–1.7 GeV/c are calculated within the intranuclear cascade (INC) approach. The invariant mass distribution of the dilepton pair for each resonance can be decomposed in two components which correspond to their decay “inside” the target nucleus and in the vacuum, respectively. The first components are strongly distorted by the nuclear medium due to resonance-nucleon scattering and a possible mass shift at finite baryon density. These medium modifications are compared to background sources in the dilepton spectrum from πN bremsstrahlung as well as the Dalitz decays of ω and η mesons produced in the reaction. Detailed predictions for π−Pb reactions at 1.3 and 1.7 GeV/c are made within several momentum bins for the lepton pair. |
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