Change to the D0 luminosity monitor constant

Abstract

The D0 experiment has previously calculated its luminosities using a visible cross section (luminosity monitor constant) for its Level 0 trigger, ""L0 = 42.9 mb based on the E710 inelastk cross section measurements. Recently, CDF has also published inelastic cross section measurements markedly different from E710. The D0 experiment has moved to world average inelastic cross sections at ./i = 1.8 TeV. The result changes the D0 visible cross section to D"L0 = 48.2 mb which is an increase of 12.43 in the visible cross section value. The error on luminosity has been left unchanged at 123.

D0 luminosity monitor constant for the 1994-1996 tevatron run

“…The probability o f n interactions in one crossing, P n , follows Poisson statistics and is given by, P n = n n! e (4) where is just n, the mean number of interactions per beam crossing.…”

“…Due to a change in the electronics for the L trigger [3] at the beginning of the 1994-1996 Tevatron run, the hardware eciency for the L trigger has been redetermined. The acceptances for the L trigger and the world average cross sections for total, elastic, and single diractive collisions [4] are unchanged as summarized in Appendix A.…”