Production cross sections of cosmic antiprotons in the light of new data from the NA61 and LHCb experiments
Abstract
The cosmic-ray flux of antiprotons is measured with high precision by the space-borne particle spectrometers AMS-02. Its interpretation requires a correct description of the dominant production process for antiprotons in our Galaxy, namely, the interaction of cosmic-ray proton and helium with the interstellar medium. In light of new cross section measurements by the NA61 experiment of p + p → $$\bar{p}$$ + X and the first ever measurement of p + He → $$\bar{p}$$ + X by the LHCb experiment, we update the parametrization of proton-proton and proton-nucleon cross sections. We find that the LHCb p He data constrain a shape for the cross section at high energies and show for the first time how well the rescaling from the p p channel applies to a helium target. By using p p , p He and p C data we estimate the uncertainty on the Lorentz invariant cross section for p + He → $$\bar{p}$$+ X . We use these new cross sections to compute the source term for all the production channels, considering also nuclei heavier than He both in cosmic rays and the interstellar medium. The uncertainties on the total source term are up to ± 20 % and slightly increase below antiproton energies of 5 GeV. This uncertainty is dominated by the p + p → $$\bar{p}$$ + X cross section, which translates into all channels since we derive them using the $pp$ cross sections. In conclusion, the cross sections to calculate the source spectra from all relevant cosmic-ray isotopes are provided in Supplemental Material. We finally quantify the necessity of new data on antiproton production cross sections, and pin down the kinematic parameter space which should be covered by future data.
- Authors:
-
- Univ. di Torino, Torino (Italy). Dipt. di Fisica; National Inst. of Nuclear Physics (INFN), Torino (Italy); RWTH Aachen Univ. (Germany). Inst. for Theoretical Particle Physics and Cosmology
- Univ. di Torino, Torino (Italy). Dipt. di Fisica; National Inst. of Nuclear Physics (INFN), Torino (Italy)
- Stanford Univ., CA (United States). W.W. Hansen Experimental Physics Laboratory, Kavli Inst. for Particle Astrophysics and Cosmology, Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE; Italian Ministry of Education, University and Research (MIUR); National Aeronautics and Space Administration (NASA)
- OSTI Identifier:
- 1458453
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. D.
- Additional Journal Information:
- Journal Volume: 97; Journal Issue: 10; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Korsmeier, Michael, Donato, Fiorenza, and Di Mauro, Mattia. Production cross sections of cosmic antiprotons in the light of new data from the NA61 and LHCb experiments. United States: N. p., 2018.
Web. doi:10.1103/physrevd.97.103019.
Korsmeier, Michael, Donato, Fiorenza, & Di Mauro, Mattia. Production cross sections of cosmic antiprotons in the light of new data from the NA61 and LHCb experiments. United States. https://doi.org/10.1103/physrevd.97.103019
Korsmeier, Michael, Donato, Fiorenza, and Di Mauro, Mattia. Tue .
"Production cross sections of cosmic antiprotons in the light of new data from the NA61 and LHCb experiments". United States. https://doi.org/10.1103/physrevd.97.103019. https://www.osti.gov/servlets/purl/1458453.
@article{osti_1458453,
title = {Production cross sections of cosmic antiprotons in the light of new data from the NA61 and LHCb experiments},
author = {Korsmeier, Michael and Donato, Fiorenza and Di Mauro, Mattia},
abstractNote = {The cosmic-ray flux of antiprotons is measured with high precision by the space-borne particle spectrometers AMS-02. Its interpretation requires a correct description of the dominant production process for antiprotons in our Galaxy, namely, the interaction of cosmic-ray proton and helium with the interstellar medium. In light of new cross section measurements by the NA61 experiment of p + p → $\bar{p}$ + X and the first ever measurement of p + He → $\bar{p}$ + X by the LHCb experiment, we update the parametrization of proton-proton and proton-nucleon cross sections. We find that the LHCb p He data constrain a shape for the cross section at high energies and show for the first time how well the rescaling from the p p channel applies to a helium target. By using p p , p He and p C data we estimate the uncertainty on the Lorentz invariant cross section for p + He → $\bar{p}$+ X . We use these new cross sections to compute the source term for all the production channels, considering also nuclei heavier than He both in cosmic rays and the interstellar medium. The uncertainties on the total source term are up to ± 20 % and slightly increase below antiproton energies of 5 GeV. This uncertainty is dominated by the p + p → $\bar{p}$ + X cross section, which translates into all channels since we derive them using the $pp$ cross sections. In conclusion, the cross sections to calculate the source spectra from all relevant cosmic-ray isotopes are provided in Supplemental Material. We finally quantify the necessity of new data on antiproton production cross sections, and pin down the kinematic parameter space which should be covered by future data.},
doi = {10.1103/physrevd.97.103019},
journal = {Physical Review. D.},
number = 10,
volume = 97,
place = {United States},
year = {Tue May 29 00:00:00 EDT 2018},
month = {Tue May 29 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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