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A measurement of the proton plus helium spectrum of cosmic rays in the TeV region with HAWC

by HAWC Collaboration, A. Albert, R. Alfaro, C. Alvarez, J. R. Angeles Camacho, J. C. Arteaga-Velázquez, K. P. Arunbabu, D. Avila Rojas, H. A. Ayala Solares, E. Belmont-Moreno, C. Brisbois, K. S. Caballero-Mora, T. Capistrán, A. Carramiñana, S. Casanova, U. Cotti, J. Cotzomi, E. De la Fuente, R. Diaz Hernandez, M. A. DuVernois, M. Durocher, J. C. Díaz-Vélez, C. Espinoza, N. Fraija, J. A. García-González, F. Garfias, M. M. González, J. A. Goodman, J. P. Harding, B. Hona, D. Huang, F. Hueyotl-Zahuantitla, P. Hüntemeyer, A. Iriarte, V. Joshi, D. Kieda, G. J. Kunde, A. Lara, W. H. Lee, H. León Vargas, J. T. Linnemann, A. L. Longinotti, G. Luis-Raya, K. Malone, O. Martinez, J. Martínez-Castro, J. A. Matthews, P. Miranda-Romagnoli, J. A. Morales-Soto, E. Moreno, M. Mostafá, A. Nayerhoda, L. Nellen, M. Newbold, R. Noriega-Papaqui, N. Omodei, E. G. Pérez-Pérez, C. D. Rho, D. Rosa-González, H. Salazar, F. Salesa Greus, A. Sandoval, J. Serna-Franco, A. J. Smith, R. W. Springer, K. Tollefson, I. Torres, R. Torres-Escobedo, F. Ureña-Mena, L. Villaseñor, X. Wang, E. Willox, H. Zhou, C. de León, J. D. Álvarez, G. B. Yodh, A. Zepeda

This is not the latest submitted version.

Submission summary

Authors (as Contributors): Juan Carlos Arteaga-Velazquez
Submission information
Arxiv Link: (pdf)
Date submitted: 2022-09-15 06:14
Submitted by: Arteaga-Velazquez, Juan Carlos
Submitted to: SciPost Physics Proceedings
Proceedings issue: 21st International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI 2022)
Ontological classification
Academic field: Physics
  • Gravitation, Cosmology and Astroparticle Physics
Approaches: Experimental, Observational


HAWC is an air-shower detector designed to study TeV gamma and cosmic rays. The observatory is composed of a $22000 \, m^2$ array of $300$ water Cherenkov tanks ($4.5 \, m$ deep x $7.3 \, m$ diameter) with $4$ photomultipliers (PMT) each. The instrument registers the number of hit PMTs, the timing information and the total charge at the PMTs during the event. From these data, shower observables such as the arrival direction, the core position at ground, the lateral age and the primary energy are estimated. In this work, we study the distribution of the shower age vs the primary energy of a sample of shower data collected by HAWC from June 2015 to June 2019 and employ a shower-age cut based on predictions of QGSJET-II-04 to separate a subsample of events dominated by H and He primaries. Using these data and a dedicated analysis, we reconstruct the cosmic ray spectrum of H+He from $6$ to $158$ TeV, which shows the presence of a softening at around $24$ TeV with a statistical significance of $4.1\sigma$.

Current status:
Has been resubmitted

Submission & Refereeing History

Resubmission 2208.13350v2 on 28 September 2022

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Sunil Gupta  on 2022-09-20  [id 2834]


There are a few minor errors that should be corrected,
Introduction section L2 in-deep ---> in-depth
L5 detail studies---> detailed studies
L10 these energy regime---> this energy regime

Section 3,
P1 L6 Fig. 1, left ---> the left plot in Fig. 1
P1 L10 on Fig. 1, right ---> in the right plot in Fig. 1

P2 L2 For this aim, ---. For this reason
P2 L9 see Fig. 2, left ---> see left plot in Fig. 2

These minor mistakes are repeated throughout. I recommend that the authors correct them before resubmitting the paper.

Author:  Juan Carlos Arteaga-Velazquez  on 2022-09-28  [id 2863]

(in reply to Sunil Gupta on 2022-09-20 [id 2834])
answer to question

We thank the reviewer for the corrections. We have fixed them in the new version of the document (v2).