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DELPHI Collaboration			DELPHI 99-157 LEDI 12
			14 October, 1999

LEP machine background and noise in the DELPHI calorimeters.

S. Ask ¹, V. Hedberg ², P. Niezurawski ³, A. Nygren ², P. Tiapkine ^{2, 4}, N. Zimin ^{2, 4}

¹ Summer student, Luleå University of Technology
² Dept. of Physics, University of Lund, Sweden
³ Dept. of Physics, Warsaw University, Poland
⁴ JINR, Dubna, Russia

Abstract:

The LEP machine background and noise in the DELPHI calorimeters have been studied in four independent analyses. The main purpose of this work is to estimate the probability of a shower from these sources in coincidence with a genuine physics event and to see how best to reject this type of background. Both the 1998 and the 1999 high energy data have been used in this study.