The Second LHAASO Collaboration Conference in 2026 & The Academic Symposium for the 10th Anniversary of the LHAASO collaboration

The absence of cosmic ray flux data with known energy and composition in the high-energy range makes it impossible to perform a direct absolute calibration of the energy scale for ground-based cosmic ray experiments. This leads to a discrepancy between the measured cosmic ray energy and its true energy, which affects not only the fine structure of the cosmic ray spectrum but also the absolute...

The energy spectra and mass composition of cosmic rays are key observables for understanding the origin, acceleration, and propagation of Galactic cosmic rays. Recent space-based experiments, including AMS-02 and DAMPE, have provided high-precision direct measurements of proton, helium, and heavier-nuclei spectra, while LHAASO has extended composition-sensitive measurements into the PeV knee...

LHAASO is a composite cosmic ray observatory comprising KM2A, WCDA, and WFCTA detector arrays. One of the core scientific goals is to precisely measure the energy spectra of individual cosmic ray components, establish a bridge between space-borne and ground-based experiments to constrain the origin, acceleration, and propagation mechanisms of cosmic rays. This work presents the joint...

In the 5–300 PeV energy range, the iron nuclear spectrum—particularly above 10 PeV—suffers from large systematic uncertainties arising from hadronic interaction models. We aim to identify a selection variable that exhibits weak dependence on hadronic models to reduce these systematic errors. Existing studies have shown that the lateral azimuthal fluctuation characteristics of showers are...

The energy reconstruction of LHAASO-KM2A relies on the electron and muon content of extensive air showers and is therefore sensitive to the hadronic interaction model. We compare proton- and iron-induced showers simulated with CORSIKA 7.4010/EPOS-LHC and CORSIKA 7.8050/EPOS-LHC-R in the energy range 100 TeV–100 PeV, matched in primary energy and zenith angle and analysed with a KM2A-like...

Muon production depth (MPD) and its maximum, $X_{\text{max}}^{\mu}$, provide information on the mass composition of primary cosmic rays. Using timing information from LHAASO-KM2A muon detectors, we reconstruct MPD distributions for proton- and iron-induced air showers simulated with CORSIKA using three high-energy hadronic interaction models: EPOS-LHC-R, QGSJET-III-01, and SIBYLL 2.3e. The...

This report presents LHAASO progress on the iron-nucleus energy spectrum above 100 TeV using WFCTA-KM2A hybrid events. Events are selected to ensure full trigger efficiency and suppress external contamination. Full efficiency is reached above 100 TeV, with an effective aperture of about 4600 m²·sr, angular resolution better than 0.5°, and core resolution better than 14 m. Energy is...

Accurate air-shower core reconstruction is an important basis for determining the geometry of extensive air showers, improving the reconstruction accuracy of related physical quantities, and reducing systematic uncertainties in cosmic-ray composition and energy-spectrum measurements. LHAASO-KM2A and WFCTA observe extensive air showers from different aspects: KM2A records the spatial...

Recent ultra-high-energy gamma-ray observations support powerful microquasars as promising Galactic PeVatron candidates capable of explaining the cosmic-ray flux around the knee while accounting for the Galactic diffuse gamma-ray emission. In this work, we further investigate this scenario by considering a two-component model combining a conventional supernova-remnant contribution with a...

Recent improvements of direct cosmic ray measurements by AMS-02, DAMPE and CALET to-
geather with precise measurements of cosmic ray proton and He, total and logA spectra at knee by
LHAASO open the possibility to study multi-component contributions to cosmic ray flux.
In this work we fit local cosmic ray flux measurements, assuming identical rigidity-dependent flux
of each component with...

The north–south displacement of the cosmic-ray Sun shadow has been shown to precede variations in near-Earth IMF $B_{y}$ by approximately 3.3 days. Whether this leading signal improves predictions beyond existing near-Earth observations, however, remains to be established.
In this work, we use multiple data sources from KM2A Sun shadow and OMNI data between 2020 and 2024, and apply Ridge...

Identifying the hadronic accelerators that power the Galactic cosmic-ray sea remains a central goal of multi-messenger astronomy. LHAASO has observed tens of ultra-high-energy gamma-ray sources, making them compelling PeVatron candidates. ANTARES uses the Earth as an atmospheric-muon filter, giving it a low-background view of the declination band overlapping the LHAASO sky. We present a...