A versatile dielectron trigger for nucleon-nucleon and nucleus-nucleus collisions

Details A versatile dielectron trigger for nucleon-nucleon and nucleus-nucleus collisions A versatile dielectron trigger for nucleon-nucleon and nucleus-nucleus collisions

1998-02-06

arxiv.org/abs/nucl-ex/9802003v1

Nucl.Instrum.Meth. A413 (1998) 213-227

Physics

Nuclear Physics

Nuclear Experiment

documentstyle[epsfig]{elsart}, 28 pages, 12 postscript figures included; Accepted by Nucl. Instr. and Meth. A

Scientific paper

A novel approach for a versatile first level dielectron trigger is presented. This trigger operates in the low multiplicity environment of nucleon-nucleon reactions as well as in the high multiplicity situation of nucleus-nucleus collisions. For optimal trigger performance, time of flight conditions for the two fastest particles of the event are combined with event multiplicity requirements. The dielectron trigger efficiency is given. The event reduction factor of such a trigger approach is studied for a low, a medium and a high multiplicity environment. The impact parameter dependence of the event reduction is given. The timing properties of the trigger signal are described. The losses due to deadtime are specified. Finally, the first level trigger rate is reported.

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