Event patterns from negative pion spectra in proton-proton and nucleus-nucleus collisions at SPS

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Ya-Hui Chen, Fu-Hu Liu and Edward K. Sarkisyan-Grinbaum. Event patterns from negative pion spectra in proton-proton and nucleus-nucleus collisions at SPS[J]. Chinese Physics C, 2018, 42(10): 104102. doi: 10.1088/1674-1137/42/10/104102
Ya-Hui Chen, Fu-Hu Liu and Edward K. Sarkisyan-Grinbaum. Event patterns from negative pion spectra in proton-proton and nucleus-nucleus collisions at SPS[J]. Chinese Physics C, 2018, 42(10): 104102.  doi: 10.1088/1674-1137/42/10/104102 shu
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Received: 2018-04-19
Revised: 2018-06-23
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    Supported by National Natural Science Foundation of China (11575103, 11747319), the Shanxi Provincial Natural Science Foundation (201701D121005) and the Fund for Shanxi 1331 Project Key Subjects Construction.

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Event patterns from negative pion spectra in proton-proton and nucleus-nucleus collisions at SPS

  • 1.  Institute of Theoretical Physics &
  • 2. Experimental Physics Department, CERN, 1211 Geneva 23, Switzerland
  • 3. Department of Physics, The University of Texas at Arlington, Arlington, TX 76019, USA
Fund Project:  Supported by National Natural Science Foundation of China (11575103, 11747319), the Shanxi Provincial Natural Science Foundation (201701D121005) and the Fund for Shanxi 1331 Project Key Subjects Construction.

Abstract: Rapidity-dependent transverse momentum spectra of negatively charged pions measured at different rapidities in proton-proton collisions at the Super Proton Synchrotron (SPS) at various energies within its Beam Energy Scan (BES) program are investigated by using one-and two-component standard distributions where the chemical potential and spin property of particles are implemented. The rapidity spectra are described by a double-Gaussian distribution. At the stage of kinetic freeze-out, the event patterns are structured by the scatter plots in the three-dimensional subspaces of velocity, momentum and rapidity. The results of the studies of the rapidity-independent transverse mass spectra measured at mid-rapidity in proton-proton collisions are compared with those based on the similar transverse mass spectra measured in the most central beryllium-beryllium, argon-scandium and lead-lead collisions from the SPS at its BES energies.

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