Author/Authors :
Alimonti، نويسنده , , G and Aihara، نويسنده , , H and Alexander، نويسنده , , J and Asano، نويسنده , , Y and Bakich، نويسنده , , A and Bo?ek، نويسنده , , A and Bana?، نويسنده , , E and Browder، نويسنده , , T and Dragic، نويسنده , , J and Fukunaga، نويسنده , , C and Gordon، نويسنده , , A and Guler، نويسنده , , H and Everton، نويسنده , , C and Heenan، نويسنده , , E and Haba، نويسنده , , J and Hazumi، نويسنده , , M and Hastings، نويسنده , , N and Hara، نويسنده , , T and ، نويسنده ,
Abstract :
A silicon vertex detector has been developed for the BELLE experiment at the KEK B-factory to be used to determine the relative displacements of B-meson decay vertices for CP violation measurements. The device has been successfully installed and operated with high-luminosity beam conditions. The average strip yield is larger than 96%, including the preamplifier electronics yield and the detector is currently working stably with a signal-to-noise ratio of 17–40. The measured impact parameter resolution agrees with expectations based on Monte Carlo simulations, and the measured D0 lifetime is in good agreement with the particle data groupʹs average of other measurements. Several B→J/ψK events produced at the ϒ(4S) resonance have been detected and separate decay vertices have been found.
Keywords :
B-factory , Silicon Vertex Detector , Belle , Radiation tolerance , Impact parameter
