Title :
Status and first experiences with the HERA-B first level trigger
Author :
Flammer, J. ; Fleckenstein, H. ; Gerndt, E. ; Glass, James ; Gropl, A. ; Hahnel, Chr. ; Itterbeck, H. ; Kahnert, D. ; Manner, R. ; Orenberg, M. Nl ; Ratnikov, F. ; Rothe, Chr. ; Wurz, A.
Author_Institution :
DESY, Hamburg, Germany
Abstract :
Summary form only given. With the HERA-B detector the collaboration of same name at DESY, Hamburg, Germany intends to measure CP violation from the B0. B mesons are produced in collisions of 920 GeV protons with a fixed wire target. Since the signal to background ratio is about $10-6$, an extremely selective and efficient trigger system is needed. The first (FLT) of a four level trigger system is capable to select electron, muon, and hadron tracks, to derive then their kinematics and reconstruct finally the invariant mass of each pair of tracks. The actual status of the HERA-B FLT is reported as well as first experiences and results with the after date built up system
Keywords :
data acquisition; high energy physics instrumentation computing; CP violation; HERA-B first level trigger; efficient trigger system; fixed wire target; four level trigger system; invariant mass; kinematics; Collaboration; Detectors; Electrons; Kinematics; Mesons; Protons; Target tracking; Wire;
Conference_Titel :
Real Time Conference, 1999. Santa Fe 1999. 11th IEEE NPSS
Conference_Location :
Sante Fe, NM
Print_ISBN :
0-7803-5463-X
DOI :
10.1109/RTCON.1999.842684
