14–24 Jul 2025
CICG - International Conference Centre - Geneva, Switzerland
Europe/Zurich timezone
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Measurements of the variance of the logarithmic mass of cosmic rays from 0.3 to 30 PeV with LHAASO-KM2A

18 Jul 2025, 18:05
15m
CICG - International Conference Centre - Geneva, Switzerland

CICG - International Conference Centre - Geneva, Switzerland

17 rue de Varembé CH - 1211 Geneva Switzerland
Talk Cosmic-Ray Indirect CRI

Speaker

Xiaoting Feng (Shandong University)

Description

We introduced a parameterization method to analyze the mean muon content $<\ln N_{\mu}>$ and its dispersion $\sigma^{2}(\ln N_{\mu})$ in relation to the mass composition of cosmic-rays. This approach enhances the Heitler model for air showers by employing a parameterization that incorporates the first two moments of the logarithmic mass distribution $\ln A$ and $\sigma^{2}_{\ln A}$. This method was tested through simulations with various mass distributions, demonstrating its applicability. We applied this method to data from LHAASO-KM2A, using three hadronic interaction models: QGSJET-II-04, EPOS-LHC, and SIBYLL 2.3d, for energies ranging from 0.3 to 30 PeV, thereby extracting the first two moments of the logarithmic mass distribution. Despite differences among these models, the results showed a consistent trend: as energy increases, $\sigma^{2}_{\ln A}$ decreases to a minimum at the knee region, then rises with further increases in energy. This method not only deepens our understanding of average mass but also elucidates the dynamics of mass dispersion. Additionally, it serves to validate the effectiveness of hadronic interaction models and aids in refining future models.

Collaboration(s) LHAASO Collaboration

Author

Xiaoting Feng (Shandong University)

Co-authors

Cunfeng Feng (Shandong Universtiy) Hengying Zhang (Yunnan University) Lingling Ma (IHEP,CAS)

Presentation materials

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