This Letter presents a measurement of prompt charged-particle production in proton-oxygen interactions at sqrt[s_{NN}]=9.62  TeV center-of-mass energy with the ATLAS detector, corresponding to 634  microb^{-1} of integrated luminosity. A total of 246x10^{6} selected events have at least one track with transverse momentum p_{T}>500  MeV and pseudorapidity |eta|<2.5. The measured fiducial proton-oxygen cross section is sigma_{fid.}^{pO}=396+-6(exp.)+-9(lumi.)  mb and the extrapolated inelastic proton-air cross section is sigma_{inel.}^{p+air}=406+-6(exp.)+-9(lumi.)+-28(th.)  mb. Measurements of charged-particle multiplicity, p_{T}, and eta distributions are an order-of-magnitude more precise than differences between hadronic-interaction models. These results enable improved modeling of cosmic-ray air showers, which is important for astroparticle physics.

Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N. ., et al. (2026). Measurement of Charged-Particle Production in root sNN = 9.62 TeV Proton-Oxygen Collisions as a Probe of Cosmic-Ray Air Showers with the ATLAS Detector. PHYSICAL REVIEW LETTERS, 137(12) [10.1103/f3nk-5lt9].

Measurement of Charged-Particle Production in root sNN = 9.62 TeV Proton-Oxygen Collisions as a Probe of Cosmic-Ray Air Showers with the ATLAS Detector

Aielli, G.;Camarri, P.;Cerrito, L.;De Sanctis, U.;Di Ciaccio, A.;
2026-09-18

Abstract

This Letter presents a measurement of prompt charged-particle production in proton-oxygen interactions at sqrt[s_{NN}]=9.62  TeV center-of-mass energy with the ATLAS detector, corresponding to 634  microb^{-1} of integrated luminosity. A total of 246x10^{6} selected events have at least one track with transverse momentum p_{T}>500  MeV and pseudorapidity |eta|<2.5. The measured fiducial proton-oxygen cross section is sigma_{fid.}^{pO}=396+-6(exp.)+-9(lumi.)  mb and the extrapolated inelastic proton-air cross section is sigma_{inel.}^{p+air}=406+-6(exp.)+-9(lumi.)+-28(th.)  mb. Measurements of charged-particle multiplicity, p_{T}, and eta distributions are an order-of-magnitude more precise than differences between hadronic-interaction models. These results enable improved modeling of cosmic-ray air showers, which is important for astroparticle physics.
18-set-2026
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Rilevanza internazionale
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Esperti anonimi
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
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Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N. ., et al. (2026). Measurement of Charged-Particle Production in root sNN = 9.62 TeV Proton-Oxygen Collisions as a Probe of Cosmic-Ray Air Showers with the ATLAS Detector. PHYSICAL REVIEW LETTERS, 137(12) [10.1103/f3nk-5lt9].
Aad, G; Aakvaag, E; Abbott, B; Abdelhameed, S; Abeling, K; Abicht, N ; Abidi, S ; Aboelela, M; Aboulhorma, A; Abramowicz, H; Acharya, B ; Ackermann, A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/474311
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