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Chinese Physics C> 2015, Vol. 39> Issue(11) : 113104 DOI: 10.1088/1674-1137/39/11/113104

Near-threshold η production in pp collisions

  •  Department of Physics, Zhengzhou University, Zhengzhou 450001, China

  • We study near-threshold η meson production in pp collisions within an effective Lagrangian approach combined with the isobar model, by allowing for the various intermediate nucleon resonances due to the π, η, and ρ-meson exchanges. It is shown that the ρ-meson exchange is the dominant excitation mechanism for these resonances, and the contribution from the N*(1720) is dominant. The total cross section data can be reasonably reproduced, and the anisotropic angular distributions of the emitted η meson are consistent with experimental measurements. Besides, the invariant mass spectra of pp and ρη explain the data well at excess energy of 15 MeV, and are basically consistent with the data at excess energy of 40 MeV. However, our model calculations cannot reasonably account for the two-peak structure in the pη distribution at excess energies of 57 and 72 MeV, which suggests that a more complicated mechanism is needed at higher energy region.
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LI De-Min and Near-threshold η production in pp collisions[J]. Chinese Physics C, 2015, 39(11): 113104. doi: 10.1088/1674-1137/39/11/113104
LI De-Min and Near-threshold η production in pp collisions[J]. Chinese Physics C, 2015, 39(11): 113104.  doi: 10.1088/1674-1137/39/11/113104 shu
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Received: 2015-01-23
Revised: 2015-06-08
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    Supported by National Natural Science Foundation of China (11105126)

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Near-threshold η production in pp collisions

    Corresponding author: LI De-Min,
  • Department of Physics, Zhengzhou University, Zhengzhou 450001, China
  • Received Date: 2015-01-23
  • Accepted Date: 2015-06-08
  • Available Online: 2015-11-20
Fund Project:  Supported by National Natural Science Foundation of China (11105126)

Abstract: We study near-threshold η meson production in pp collisions within an effective Lagrangian approach combined with the isobar model, by allowing for the various intermediate nucleon resonances due to the π, η, and ρ-meson exchanges. It is shown that the ρ-meson exchange is the dominant excitation mechanism for these resonances, and the contribution from the N*(1720) is dominant. The total cross section data can be reasonably reproduced, and the anisotropic angular distributions of the emitted η meson are consistent with experimental measurements. Besides, the invariant mass spectra of pp and ρη explain the data well at excess energy of 15 MeV, and are basically consistent with the data at excess energy of 40 MeV. However, our model calculations cannot reasonably account for the two-peak structure in the pη distribution at excess energies of 57 and 72 MeV, which suggests that a more complicated mechanism is needed at higher energy region.

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