The interpretation of cosmic antiproton flux measurements from space-borne experiments is currently limited by the knowledge of the antiproton production cross-section in collisions between primary cosmic rays and the interstellar medium. Using collisions of protons with an energy of 6.5 TeV incident on helium nuclei at rest in the proximity of the interaction region of the LHCb experiment, the ratio of antiprotons originating from antihyperon decays to prompt production is measured for antiproton momenta between 12 and 110 GeV/c. The dominant antihyperon contribution, namely (Lambda) over bar -> (p) over bar pi(+) decays from promptly produced (Lambda) over bar particles, is also exclusively measured. The results complement the measurement of prompt antiproton production obtained from the same data sample. At the energy scale of this measurement, the antihyperon contributions to antiproton production are observed to be significantly larger than predictions of commonly used hadronic production models.

Aaij, R., Abdelmotteleb, A., Beteta, C.a., Abudinen, F., Ackernley, T., Adeva, B., et al. (2023). Measurement of antiproton production from antihyperon decays in pHe collisions at √sNN=110 GeV. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 83(6) [10.1140/epjc/s10052-023-11673-x].

Measurement of antiproton production from antihyperon decays in pHe collisions at √sNN=110 GeV

Archilli, F.;Santovetti, E.;
2023-06-27

Abstract

The interpretation of cosmic antiproton flux measurements from space-borne experiments is currently limited by the knowledge of the antiproton production cross-section in collisions between primary cosmic rays and the interstellar medium. Using collisions of protons with an energy of 6.5 TeV incident on helium nuclei at rest in the proximity of the interaction region of the LHCb experiment, the ratio of antiprotons originating from antihyperon decays to prompt production is measured for antiproton momenta between 12 and 110 GeV/c. The dominant antihyperon contribution, namely (Lambda) over bar -> (p) over bar pi(+) decays from promptly produced (Lambda) over bar particles, is also exclusively measured. The results complement the measurement of prompt antiproton production obtained from the same data sample. At the energy scale of this measurement, the antihyperon contributions to antiproton production are observed to be significantly larger than predictions of commonly used hadronic production models.
27-giu-2023
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/01
English
Con Impact Factor ISI
Aaij, R., Abdelmotteleb, A., Beteta, C.a., Abudinen, F., Ackernley, T., Adeva, B., et al. (2023). Measurement of antiproton production from antihyperon decays in pHe collisions at √sNN=110 GeV. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 83(6) [10.1140/epjc/s10052-023-11673-x].
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