Belle computing system

Belle Computing System

We describe the present status of the computing system in the Belle experiment at the KEKB ee asymmetricenergy collider. So far, we have logged more than 160 fb of data, corresponding to the world’s largest data sample of 170M BB̄ pairs at the Υ(4S) energy region. A large amount of event data has to be processed to produce an analysis event sample in a timely fashion. In addition, Monte Carlo ev...

Computing System for the Belle Experiment

We describe the offline computing system of the Belle experiment, consisting of a computing farm with one thousand IA-32 CPUs. Up to now, the Belle experiment has accumulated more than 120 fb of data, which is the world largest BB̄ sample at the Υ(4S) energy. The data have to be processed with a single version of reconstruction software and calibration constants to perform precise measurements o...

Belle Collaboration

We have searched for neutrinoless τ lepton decays into lhh or lV , where l stands for an electron or muon, h for a charged light hadron, π or K, and V 0 for a neutral vector meson, ρ, K(892) and φ, using a 158 fb data sample collected with the Belle detector at the KEKB ee collider. Since the number of events observed are consistent with the expected background, we set upper limits on the branc...

A Detailed Monte-Carlo Simulation for the Belle TOF System

We have developed a detailed Monte Carlo simulation program for the Belle TOF system. Based on GEANT simulation, it takes account of all physics processes in the TOF scintillation counters and readout electronics. The simulation reproduces very well the performance of the Belle TOF system, including the dE/dx response, the time walk effect, the time resolution, and the hit efficiency due to bea...

Calibration and Performance of the Belle TOF system