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High Energy Physics - Experiment

arXiv:2102.07797 (hep-ex)
[Submitted on 15 Feb 2021 (v1), last revised 27 Apr 2021 (this version, v2)]

Title:Measurement of the fluctuations in the number of muons in extensive air showers with the Pierre Auger Observatory

Authors:The Pierre Auger Collaboration: A. Aab, P. Abreu, M. Aglietta, J.M. Albury, I. Allekotte, A. Almela, J. Alvarez-Muñiz, R. Alves Batista, G.A. Anastasi, L. Anchordoqui, B. Andrada, S. Andringa, C. Aramo, P.R. Araújo Ferreira, H. Asorey, P. Assis, G. Avila, A.M. Badescu, A. Bakalova, A. Balaceanu, F. Barbato, R.J. Barreira Luz, K.H. Becker, J.A. Bellido, C. Berat, M.E. Bertaina, X. Bertou, P.L. Biermann, T. Bister, J. Biteau, J. Blazek, C. Bleve, M. Boháčová, D. Boncioli, C. Bonifazi, L. Bonneau Arbeletche, N. Borodai, A.M. Botti, J. Brack, T. Bretz, F.L. Briechle, P. Buchholz, A. Bueno, S. Buitink, M. Buscemi, K.S. Caballero-Mora, L. Caccianiga, A. Cancio, F. Canfora, I. Caracas, J.M. Carceller, R. Caruso, A. Castellina, F. Catalani, G. Cataldi, L. Cazon, M. Cerda, J.A. Chinellato, K. Choi, J. Chudoba, L. Chytka, R.W. Clay, A.C. Cobos Cerutti, R. Colalillo, A. Coleman, M.R. Coluccia, R. Conceição, A. Condorelli, G. Consolati, F. Contreras, F. Convenga, C.E. Covault, S. Dasso, K. Daumiller, B.R. Dawson, J.A. Day, R.M. de Almeida, J. de Jesús, S.J. de Jong, G. De Mauro, J.R.T. de Mello Neto, I. De Mitri, J. de Oliveira, D. de Oliveira Franco, V. de Souza, E. De Vito, J. Debatin, M. del Río, O. Deligny, H. Dembinski, N. Dhital, A. Di Matteo, C. Dobrigkeit, J.C. D'Olivo, R.C. dos Anjos, M.T. Dova, J. Ebr, R. Engel, I. Epicoco et al. (268 additional authors not shown)  You must enable JavaScript to view entire author list.
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Abstract:We present the first measurement of the fluctuations in the number of muons in extensive air showers produced by ultrahigh energy cosmic rays. We find that the measured fluctuations are in good agreement with predictions from air shower simulations. This observation provides new insights into the origin of the previously reported deficit of muons in air shower simulations and constrains models of hadronic interactions at ultrahigh energies. Our measurement is compatible with the muon deficit originating from small deviations in the predictions from hadronic interaction models of particle production that accumulate as the showers develop.
Comments: Published version, 11 pages, 3 figures, 1 table, Supplemental material appended
Subjects: High Energy Physics - Experiment (hep-ex)
Report number: FERMILAB-PUB-21-202-AD-AE-SCD-TD
Cite as: arXiv:2102.07797 [hep-ex]
  (or arXiv:2102.07797v2 [hep-ex] for this version)
  https://doi.org/10.48550/arXiv.2102.07797
Journal reference: Phys. Rev. Lett. 126, 152002 (2021)
Related DOI: https://doi.org/10.1103/PhysRevLett.126.152002

Submission history

From: Felix Riehn [view email]
[v1] Mon, 15 Feb 2021 19:04:42 UTC (590 KB)
[v2] Tue, 27 Apr 2021 17:32:05 UTC (2,844 KB)
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