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

fYear

1999

fDate

1999

Firstpage

516

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Real Time Conference, 1999. Santa Fe 1999. 11th IEEE NPSS

Conference_Location

Sante Fe, NM

Print_ISBN

0-7803-5463-X

Type

conf

DOI

10.1109/RTCON.1999.842684

Filename

842684