The Large High Altitude Air Shower Observatory (LHAASO) Science Book
  (2021 Edition)
  Since the science white paper of the Large High Altitude Air Shower
Observatory (LHAASO) published on arXiv in 2019 [e-Print: 1905.02773
(astro-ph.HE)], LHAASO has completed the transition from a project to an
operational gamma-ray astronomical observatory LHAASO is a new generation
multi-component facility located in Daocheng, Sichuan province of China, at an
altitude of 4410 meters. It aims at measuring with unprecedented sensitivity
the spectrum, composition, and anisotropy of cosmic rays in the energy range
between 10$^{12}$ and 10$^{18}$~eV, and acting simultaneously as a wide
aperture (one stereoradiant) continuously operating gamma-ray telescope in the
energy range between 10$^{11}$ and $10^{15}$~eV with the designed sensitivity
of 1.3\% of the Crab Unit (CU) above 100 TeV. LHAASO's capability of measuring
simultaneously different shower components (electrons, muons, and
Cherenkov/fluorescence light), will allow it to investigate the origin,
acceleration, and propagation of CR through measurement of the energy spectrum,
elemental composition, and anisotropy with unprecedented resolution. The
remarkable sensitivity of LHAASO will play a key role in CR physics and
gamma-ray astronomy for a general and comprehensive exploration of the high
energy universe and will allow important studies of fundamental physics (such
as indirect dark matter search, Lorentz invariance violation, quantum gravity)
and solar and heliospheric physics. The LHAASO Collaboration organized an
editorial working group and finished all editorial work of this science book,
to summarize the instrumental features and outline the prospects of scientific
researches with the LHAASO experiment.
