Observation of Large-Scale Anisotropy in Very-High-Energy Cosmic Ray Protons with LHAASO-KM2A

LHAASO Collaboration

doi:10.22323/1.501.0286

Observation of Large-Scale Anisotropy in Very-High-Energy Cosmic Ray Protons with LHAASO-KM2A

LHAASO Collaboration

CAS - Institute of High Energy Physics
University of Chinese Academy of Sciences
TIANFU Cosmic Ray Research Center
University of Science and Technology of China
Yerevan State University
Max Planck Institute for Nuclear Physics
Shanghai Jiao Tong University
Guangzhou University
Institute for Nuclear Research of the Russian Academy of Sciences
Southwest Jiaotong University
University of Science and Technology of China
CAS - Purple Mountain Observatory
Zhejiang Lab
CAS - Shanghai Astronomical Observatory
Yunnan University
Tibet University
Nanjing University
Chinese University of Hong Kong
Hebei Normal University
CAS - National Astronomical Observatories
Sun Yat-Sen University
School of Physics
Shandong University
Université Paris Cité
Tsinghua University
Zhengzhou University
China Center of Advanced Science and Technology World Laboratory
Sichuan University
Nanchang University
Peking University
Guangxi University
Mahidol University
Nanjing Normal University
Moscow Institute of Physics and Technology
CAS - National Space Science Center
Huazhong University of Science and Technology

科研成果: 期刊稿件 › 会议文章 › 同行评审

摘要

We present a measurement of large-scale anisotropies in high-purity protons utilizing the Large High Altitude Air Shower Observatory (LHAASO). We analyzed data collected over three years from the kilometer-squared array (KM2A). Proton data was selected using a cut based on the ratio of muonic to electromagnetic components, akin to the gamma/background discrimination method used in KM2A. The proton sample achieved a purity of up to 80%, with reconstructed energies ranging from 10 TeV to 220 TeV. We conducted an analysis of the energy evolution of dipole anisotropy in protons within this energy range and identified that the turnover energy in amplitude and phase occurs at a lower energy compared to samples of heavier nuclei.

源语言	英语
文章编号	286
期刊	Proceedings of Science
卷	501
DOI	https://doi.org/10.22323/1.501.0286
出版状态	已出版 - 30 12月 2025
已对外发布	是
活动	39th International Cosmic Ray Conference, ICRC 2025 - Geneva, 瑞士期限: 15 7月 2025 → 24 7月 2025

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@article{29cb787edb5b42439ba16f93dc5cea88,

title = "Observation of Large-Scale Anisotropy in Very-High-Energy Cosmic Ray Protons with LHAASO-KM2A",

abstract = "We present a measurement of large-scale anisotropies in high-purity protons utilizing the Large High Altitude Air Shower Observatory (LHAASO). We analyzed data collected over three years from the kilometer-squared array (KM2A). Proton data was selected using a cut based on the ratio of muonic to electromagnetic components, akin to the gamma/background discrimination method used in KM2A. The proton sample achieved a purity of up to 80\%, with reconstructed energies ranging from 10 TeV to 220 TeV. We conducted an analysis of the energy evolution of dipole anisotropy in protons within this energy range and identified that the turnover energy in amplitude and phase occurs at a lower energy compared to samples of heavier nuclei.",

author = "\{LHAASO Collaboration\} and Zhen Cao and F. Aharonian and Bai, \{Y. X.\} and Bao, \{Y. W.\} and D. Bastieri and Bi, \{X. J.\} and Bi, \{Y. J.\} and W. Bian and Bukevich, \{A. V.\} and Cai, \{C. M.\} and Cao, \{W. Y.\} and Zhe Cao and J. Chang and Chang, \{J. F.\} and Chen, \{A. M.\} and Chen, \{E. S.\} and Chen, \{G. H.\} and Chen, \{H. X.\} and Liang Chen and Long Chen and Chen, \{M. J.\} and Chen, \{M. L.\} and Chen, \{Q. H.\} and S. Chen and Chen, \{S. H.\} and Chen, \{S. Z.\} and Chen, \{T. L.\} and Chen, \{X. B.\} and Chen, \{X. J.\} and Y. Chen and N. Cheng and Cheng, \{Y. D.\} and Chu, \{M. C.\} and Cui, \{M. Y.\} and Cui, \{S. W.\} and Cui, \{X. H.\} and Cui, \{Y. D.\} and Dai, \{B. Z.\} and Dai, \{H. L.\} and Dai, \{Z. G.\} and Danzengluobu and Diao, \{Y. X.\} and Dong, \{X. Q.\} and Duan, \{K. K.\} and Fan, \{J. H.\} and Fan, \{Y. Z.\} and J. Fang and Fang, \{J. H.\} and K. Fang and Geng, \{L. S.\}",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s); 39th International Cosmic Ray Conference, ICRC 2025 ; Conference date: 15-07-2025 Through 24-07-2025",

year = "2025",

month = dec,

day = "30",

doi = "10.22323/1.501.0286",

language = "英语",

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TY - JOUR

T1 - Observation of Large-Scale Anisotropy in Very-High-Energy Cosmic Ray Protons with LHAASO-KM2A

AU - LHAASO Collaboration

AU - Cao, Zhen

AU - Aharonian, F.

AU - Bai, Y. X.

AU - Bao, Y. W.

AU - Bastieri, D.

AU - Bi, X. J.

AU - Bi, Y. J.

AU - Bian, W.

AU - Bukevich, A. V.

AU - Cai, C. M.

AU - Cao, W. Y.

AU - Cao, Zhe

AU - Chang, J.

AU - Chang, J. F.

AU - Chen, A. M.

AU - Chen, E. S.

AU - Chen, G. H.

AU - Chen, H. X.

AU - Chen, Liang

AU - Chen, Long

AU - Chen, M. J.

AU - Chen, M. L.

AU - Chen, Q. H.

AU - Chen, S.

AU - Chen, S. H.

AU - Chen, S. Z.

AU - Chen, T. L.

AU - Chen, X. B.

AU - Chen, X. J.

AU - Chen, Y.

AU - Cheng, N.

AU - Cheng, Y. D.

AU - Chu, M. C.

AU - Cui, M. Y.

AU - Cui, S. W.

AU - Cui, X. H.

AU - Cui, Y. D.

AU - Dai, B. Z.

AU - Dai, H. L.

AU - Dai, Z. G.

AU - Danzengluobu,

AU - Diao, Y. X.

AU - Dong, X. Q.

AU - Duan, K. K.

AU - Fan, J. H.

AU - Fan, Y. Z.

AU - Fang, J.

AU - Fang, J. H.

AU - Fang, K.

AU - Geng, L. S.

PY - 2025/12/30

Y1 - 2025/12/30

N2 - We present a measurement of large-scale anisotropies in high-purity protons utilizing the Large High Altitude Air Shower Observatory (LHAASO). We analyzed data collected over three years from the kilometer-squared array (KM2A). Proton data was selected using a cut based on the ratio of muonic to electromagnetic components, akin to the gamma/background discrimination method used in KM2A. The proton sample achieved a purity of up to 80%, with reconstructed energies ranging from 10 TeV to 220 TeV. We conducted an analysis of the energy evolution of dipole anisotropy in protons within this energy range and identified that the turnover energy in amplitude and phase occurs at a lower energy compared to samples of heavier nuclei.

AB - We present a measurement of large-scale anisotropies in high-purity protons utilizing the Large High Altitude Air Shower Observatory (LHAASO). We analyzed data collected over three years from the kilometer-squared array (KM2A). Proton data was selected using a cut based on the ratio of muonic to electromagnetic components, akin to the gamma/background discrimination method used in KM2A. The proton sample achieved a purity of up to 80%, with reconstructed energies ranging from 10 TeV to 220 TeV. We conducted an analysis of the energy evolution of dipole anisotropy in protons within this energy range and identified that the turnover energy in amplitude and phase occurs at a lower energy compared to samples of heavier nuclei.

UR - https://www.scopus.com/pages/publications/105029023579

U2 - 10.22323/1.501.0286

DO - 10.22323/1.501.0286

M3 - 会议文章

AN - SCOPUS:105029023579

SN - 1824-8039

VL - 501

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 286

T2 - 39th International Cosmic Ray Conference, ICRC 2025

Y2 - 15 July 2025 through 24 July 2025

ER -

Observation of Large-Scale Anisotropy in Very-High-Energy Cosmic Ray Protons with LHAASO-KM2A

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