Hit efficiency study of CMS prototype forward pixel detectors

In this paper I describe the measurement of the hit efficiency of a prototype pixel device for the CMS forward pixel detector. The data were taken with the 120 GeV proton beam at Fermilab during the period of December 2004–February 2005. The detectors proved to be highly efficient ( 99.27 ± 0.02 % ) . The inefficiency was primarily located near the corners of the individual pixels.