Journal Article

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

Olivares, M. E., Vorobyev, V., Benito, C. Marin, Chefdeville, M., Alexander, M., Jones, C. R., Durante, P., Malczewski, J. J., Gao, Y., Eschle, J., Brossa Gonzalo, A., Yang, Z., Petric, M., Cardinale, R., Mead, J. V., Barlow, R. J., Pham, H., Schmelling, M., Vázquez Sierra, C., Zhou, T., Cai, H., Bedeschi, F., Swientek, K., Yang, Y., Millard, E., Pugatch, V., Ketel, T., Bobulska, D., Ferro-Luzzi, M., Lefèvre, R., Zhang, S., Davolio, F, Solovev, A., Golubkov, D., Passalacqua, B., Baptista de Souza Leite, J., Terentev, A., Lampis, A., Williams, R., Dalseno, J., Jawahery, A., Lai, A., Schneider, O., Rama, M., Bozzi, C., Carniti, P., Fontana, M., Karpenkov, D., Diaz, M. Vieites, Ene, A., Tanner, A. R., Smith, E., Zhou, X., Gibson, V., Mulder, M., Ramos Pernas, M., Hollitt, S. E., Bezshyiko, Ia, Ribatti, R., vom Bruch, D., Bertella, C., Tuning, N., Zharkova, A., Cobbledick, J. L., Morris, A. B., Carboni, G., De Freitas Carneiro Da Graca, U., Downes, A. G., Zenaiev, O., Puill, V., Didenko, S., McNulty, R., Baldini, W., Ponce, S., Karacson, M., Marshall, A. M., Bian, L., Decamp, D., Brea Rodriguez, A., Skidmore, N., Chulikov, V., Romanovskiy, V., Maleck

2023

Overview

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 Te V 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 Ge V\\!/ c . The dominant antihyperon contribution, namely Λ ¯ → p ¯ π + decays from promptly produced Λ ¯ 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.

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V
• Subject: Antiparticles / Antiprotons / Astronomy / Astrophysics and Cosmology / Collaboration / Collisions / Cosmic rays / Elementary Particles / Energy / Gases / Hadrons / Heavy Ions / Helium / Interstellar matter / Large Hadron Collider / Measurement Science and Instrumentation / Nuclear Energy / Nuclear Physics / Nuclei (nuclear physics) / Outdoor air quality / Particle decay / Physics / Physics and Astronomy / Primary cosmic rays / Quantum Field Theories / Quantum Field Theory / Regular Article - Experimental Physics / Sensors / String Theory