Dark matter or correlated errors: Systematics of the AMS-02 antiproton excess
Several studies have pointed out an excess in the AMS-02 antiproton spectrum at rigidities of 10–20 GV. Its spectral properties were found to be consistent with a dark-matter particle of mass 50–100 GeV which annihilates hadronically at roughly the thermal rate. In this paper, we reinvestigate the a...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2020-10-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.043017 |
| _version_ | 1797211283335938048 |
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| author | Jan Heisig Michael Korsmeier Martin Wolfgang Winkler |
| author_facet | Jan Heisig Michael Korsmeier Martin Wolfgang Winkler |
| author_sort | Jan Heisig |
| collection | DOAJ |
| description | Several studies have pointed out an excess in the AMS-02 antiproton spectrum at rigidities of 10–20 GV. Its spectral properties were found to be consistent with a dark-matter particle of mass 50–100 GeV which annihilates hadronically at roughly the thermal rate. In this paper, we reinvestigate the antiproton excess, including all relevant sources of systematic errors. Most importantly, we perform a realistic estimate of the correlations in the AMS-02 systematic error which could potentially “fake” a dark-matter signal. The dominant systematics in the relevant rigidity range originate from uncertainties in the cross sections for absorption of cosmic rays within the detector material. We calculate their correlations within the Glauber-Gribov theory of inelastic scattering. The AMS-02 correlations enter our spectral search for dark matter in the form of covariance matrices, which we make publicly available for the cosmic-ray community. We find that the global significance of the antiproton excess is reduced to below 1 σ once all systematics, including the derived AMS-02 error correlations, are taken into account. No significant preference for a dark-matter signal in the AMS-02 antiproton data is found in the mass range 10–10 000 GeV. |
| first_indexed | 2024-04-24T10:24:02Z |
| format | Article |
| id | doaj.art-a4d811e76d1f494484dc2d78eb977818 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:24:02Z |
| publishDate | 2020-10-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-a4d811e76d1f494484dc2d78eb9778182024-04-12T17:01:49ZengAmerican Physical SocietyPhysical Review Research2643-15642020-10-012404301710.1103/PhysRevResearch.2.043017Dark matter or correlated errors: Systematics of the AMS-02 antiproton excessJan HeisigMichael KorsmeierMartin Wolfgang WinklerSeveral studies have pointed out an excess in the AMS-02 antiproton spectrum at rigidities of 10–20 GV. Its spectral properties were found to be consistent with a dark-matter particle of mass 50–100 GeV which annihilates hadronically at roughly the thermal rate. In this paper, we reinvestigate the antiproton excess, including all relevant sources of systematic errors. Most importantly, we perform a realistic estimate of the correlations in the AMS-02 systematic error which could potentially “fake” a dark-matter signal. The dominant systematics in the relevant rigidity range originate from uncertainties in the cross sections for absorption of cosmic rays within the detector material. We calculate their correlations within the Glauber-Gribov theory of inelastic scattering. The AMS-02 correlations enter our spectral search for dark matter in the form of covariance matrices, which we make publicly available for the cosmic-ray community. We find that the global significance of the antiproton excess is reduced to below 1 σ once all systematics, including the derived AMS-02 error correlations, are taken into account. No significant preference for a dark-matter signal in the AMS-02 antiproton data is found in the mass range 10–10 000 GeV.http://doi.org/10.1103/PhysRevResearch.2.043017 |
| spellingShingle | Jan Heisig Michael Korsmeier Martin Wolfgang Winkler Dark matter or correlated errors: Systematics of the AMS-02 antiproton excess Physical Review Research |
| title | Dark matter or correlated errors: Systematics of the AMS-02 antiproton excess |
| title_full | Dark matter or correlated errors: Systematics of the AMS-02 antiproton excess |
| title_fullStr | Dark matter or correlated errors: Systematics of the AMS-02 antiproton excess |
| title_full_unstemmed | Dark matter or correlated errors: Systematics of the AMS-02 antiproton excess |
| title_short | Dark matter or correlated errors: Systematics of the AMS-02 antiproton excess |
| title_sort | dark matter or correlated errors systematics of the ams 02 antiproton excess |
| url | http://doi.org/10.1103/PhysRevResearch.2.043017 |
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