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First Measurement of the Branching Fraction of the Decay psi(2S) --> tau tau
J. Z. Bai
The branching fraction of the psi(2S) decay into tau pair has been measured for the first time using the BES detector at the Beijing Electron-Positron Collider. The result is $B_{τ…
Primary proton spectrum between 200 TeV and 1000 TeV observed with the Tibet burst detector and air shower array
M. Amenomori, S. Ayabe, Caidong
Since 1996, a hybrid experiment consisting of the emulsion chamber and burst detector array and the Tibet-II air-shower array has been operated at Yangbajing (4300 m above sea leve…
A study of the shadowing of galactic cosmic rays by the sun in a quiet phase of solar activity with the Tibet air shower array
M. Amenomori, S. Ayabe, Caidong
We have shown that the Sun's shadow by high energy cosmic rays moves year by year and its behavior is correlated with a time variation of the large-scale structure of the solar and…
Measurement of air shower cores to study the cosmic ray composition in the knee energy region
M. Amenomori, S. Ayabe, Caidong
Since 1996, a hybrid experiment consisting of an emulsion chamber and a burst detector array and the Tibet-II air shower array has been operated at Yangbajing (4300 m above sea lev…
Detection of Multi-TeV Gamma Rays from Markarian 501 during an Unforeseen Flaring State in 1997 with the Tibet Air Shower Array
M. Amenomori
In 1997, the BL Lac Object Mrk 501 entered a very active phase and was the brightest source in the sky at TeV energies, showing strong and frequent flaring. Using the data obtained…
A Measurement of the Mass and Full-Width of the Meson
J. Z. Bai
In a sample of 7.8 million decays collected in the Beijing Spectrometer, the process J/ is observed for five different decay channels: , $π^+π^-…