Observation of Large-Scale Anisotropy in Very-High-Energy Cosmic Ray Protons with LHAASO-KM2A
Issued Date
2025-12-30
Resource Type
eISSN
18248039
Scopus ID
2-s2.0-105029023579
Journal Title
Proceedings of Science
Volume
501
Rights Holder(s)
SCOPUS
Bibliographic Citation
Proceedings of Science Vol.501 (2025)
Suggested Citation
Cao Z., Aharonian F., Bai Y.X., Bao Y.W., Bastieri D., Bi X.J., Bi Y.J., Bian W., Bukevich A.V., Cai C.M., Cao W.Y., Cao Z., Chang J., Chang J.F., Chen A.M., Chen E.S., Chen G.H., Chen H.X., Chen L., Chen L., Chen M.J., Chen M.L., Chen Q.H., Chen S., Chen S.H., Chen S.Z., Chen T.L., Chen X.B., Chen X.J., Chen Y., Cheng N., Cheng Y.D., Chu M.C., Cui M.Y., Cui S.W., Cui X.H., Cui Y.D., Dai B.Z., Dai H.L., Dai Z.G., Danzengluobu, Diao Y.X., Dong X.Q., Duan K.K., Fan J.H., Fan Y.Z., Fang J., Fang J.H., Fang K., Feng C.F., Feng H., Feng L., Feng S.H., Feng X.T., Feng Y., Feng Y.L., Gabici S., Gao B., Gao C.D., Gao Q., Gao W., Gao W.K., Ge M.M., Ge T.T., Geng L.S., Giacinti G., Gong G.H., Gou Q.B., Gu M.H., Guo F.L., Guo J., Guo X.L., Guo Y.Q., Guo Y.Y., Han Y.A., Hannuksela O.A., Hasan M., He H.H., He H.N., He J.Y., He X.Y., He Y., Hernández-Cadena S., Hou B.W., Hou C., Hou X., Hu H.B., Hu S.C., Huang C., Huang D.H., Huang J.J., Huang T.Q., Huang W.J., Huang X.T., Huang X.Y., Huang Y., Huang Y.Y., Ji X.L., Jia H.Y., Jia K. Observation of Large-Scale Anisotropy in Very-High-Energy Cosmic Ray Protons with LHAASO-KM2A. Proceedings of Science Vol.501 (2025). doi:10.22323/1.501.0286 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/114884
Title
Observation of Large-Scale Anisotropy in Very-High-Energy Cosmic Ray Protons with LHAASO-KM2A
Author(s)
Cao Z.
Aharonian F.
Bai Y.X.
Bao Y.W.
Bastieri D.
Bi X.J.
Bi Y.J.
Bian W.
Bukevich A.V.
Cai C.M.
Cao W.Y.
Cao Z.
Chang J.
Chang J.F.
Chen A.M.
Chen E.S.
Chen G.H.
Chen H.X.
Chen L.
Chen L.
Chen M.J.
Chen M.L.
Chen Q.H.
Chen S.
Chen S.H.
Chen S.Z.
Chen T.L.
Chen X.B.
Chen X.J.
Chen Y.
Cheng N.
Cheng Y.D.
Chu M.C.
Cui M.Y.
Cui S.W.
Cui X.H.
Cui Y.D.
Dai B.Z.
Dai H.L.
Dai Z.G.
Danzengluobu
Diao Y.X.
Dong X.Q.
Duan K.K.
Fan J.H.
Fan Y.Z.
Fang J.
Fang J.H.
Fang K.
Feng C.F.
Feng H.
Feng L.
Feng S.H.
Feng X.T.
Feng Y.
Feng Y.L.
Gabici S.
Gao B.
Gao C.D.
Gao Q.
Gao W.
Gao W.K.
Ge M.M.
Ge T.T.
Geng L.S.
Giacinti G.
Gong G.H.
Gou Q.B.
Gu M.H.
Guo F.L.
Guo J.
Guo X.L.
Guo Y.Q.
Guo Y.Y.
Han Y.A.
Hannuksela O.A.
Hasan M.
He H.H.
He H.N.
He J.Y.
He X.Y.
He Y.
Hernández-Cadena S.
Hou B.W.
Hou C.
Hou X.
Hu H.B.
Hu S.C.
Huang C.
Huang D.H.
Huang J.J.
Huang T.Q.
Huang W.J.
Huang X.T.
Huang X.Y.
Huang Y.
Huang Y.Y.
Ji X.L.
Jia H.Y.
Jia K.
Aharonian F.
Bai Y.X.
Bao Y.W.
Bastieri D.
Bi X.J.
Bi Y.J.
Bian W.
Bukevich A.V.
Cai C.M.
Cao W.Y.
Cao Z.
Chang J.
Chang J.F.
Chen A.M.
Chen E.S.
Chen G.H.
Chen H.X.
Chen L.
Chen L.
Chen M.J.
Chen M.L.
Chen Q.H.
Chen S.
Chen S.H.
Chen S.Z.
Chen T.L.
Chen X.B.
Chen X.J.
Chen Y.
Cheng N.
Cheng Y.D.
Chu M.C.
Cui M.Y.
Cui S.W.
Cui X.H.
Cui Y.D.
Dai B.Z.
Dai H.L.
Dai Z.G.
Danzengluobu
Diao Y.X.
Dong X.Q.
Duan K.K.
Fan J.H.
Fan Y.Z.
Fang J.
Fang J.H.
Fang K.
Feng C.F.
Feng H.
Feng L.
Feng S.H.
Feng X.T.
Feng Y.
Feng Y.L.
Gabici S.
Gao B.
Gao C.D.
Gao Q.
Gao W.
Gao W.K.
Ge M.M.
Ge T.T.
Geng L.S.
Giacinti G.
Gong G.H.
Gou Q.B.
Gu M.H.
Guo F.L.
Guo J.
Guo X.L.
Guo Y.Q.
Guo Y.Y.
Han Y.A.
Hannuksela O.A.
Hasan M.
He H.H.
He H.N.
He J.Y.
He X.Y.
He Y.
Hernández-Cadena S.
Hou B.W.
Hou C.
Hou X.
Hu H.B.
Hu S.C.
Huang C.
Huang D.H.
Huang J.J.
Huang T.Q.
Huang W.J.
Huang X.T.
Huang X.Y.
Huang Y.
Huang Y.Y.
Ji X.L.
Jia H.Y.
Jia K.
Author's Affiliation
University of Chinese Academy of Sciences
Tsinghua University
Shanghai Jiao Tong University
Sun Yat-Sen University
University of Science and Technology of China
Université Paris Cité
Shandong University
Nanjing University
Chinese University of Hong Kong
Zhengzhou University
Southwest Jiaotong University
Yunnan University
Guangzhou University
Institute of High Energy Physics, Chinese Academy of Sciences
National Astronomical Observatories Chinese Academy of Sciences
Max-Planck-Institut für Kernphysik
Hebei Normal University
Institute for Nuclear Research of the Russian Academy of Sciences
Yerevan State University
China Center of Advanced Science and Technology World Laboratory
Zhejiang Lab
Purple Mountain Observatory Chinese Academy of Sciences
Shanghai Astronomical Observatory Chinese Academy of Sciences
Yunnan Observatories
Tibet University
State Key Laboratory of Particle Detection & Electronics
TIANFU Cosmic Ray Research Center
School of Physics
Tsinghua University
Shanghai Jiao Tong University
Sun Yat-Sen University
University of Science and Technology of China
Université Paris Cité
Shandong University
Nanjing University
Chinese University of Hong Kong
Zhengzhou University
Southwest Jiaotong University
Yunnan University
Guangzhou University
Institute of High Energy Physics, Chinese Academy of Sciences
National Astronomical Observatories Chinese Academy of Sciences
Max-Planck-Institut für Kernphysik
Hebei Normal University
Institute for Nuclear Research of the Russian Academy of Sciences
Yerevan State University
China Center of Advanced Science and Technology World Laboratory
Zhejiang Lab
Purple Mountain Observatory Chinese Academy of Sciences
Shanghai Astronomical Observatory Chinese Academy of Sciences
Yunnan Observatories
Tibet University
State Key Laboratory of Particle Detection & Electronics
TIANFU Cosmic Ray Research Center
School of Physics
Corresponding Author(s)
Other Contributor(s)
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.