Dortmund 2006 – scientific programme

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T: Teilchenphysik

T 304: Detektoren

T 304.1: Talk

Tuesday, March 28, 2006, 16:40–16:55, C2-02-176

The ZEUS Luminosity Spectrometer — •Juraj Šutiak¹, Miroslav Helbich², Yujin Ning², Stathes Paganis², Zhenhai Ren², William Schmidke², Frank Sciulli², Uwe Schneekloth³, Claudia Büttner¹, and Allen Caldwell¹ — ¹Max-Planck-Institut für Physik, München, Germany — ²Nevis Laboratories, Columbia University, Irvington on Hudson, New York 10027 — ³Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany

ZEUS is one of two experiments studying e-p interactions at the HERA collider. Precise knowledge of the luminosity is required to precisely determine the cross-sections of physics processes. The luminosity is measured using the rate of photons produced in the well known bremsstrahlung process ep→ ep γ. The upgrade of the HERA accelerator has provided much increased collider luminosity. The intense synchrotron radiation field, as well as the high probability of several bremsstrahlung photons in one bunch-crossing, poses new experimental challenges. An overview of a new detector, the Luminosity Spectrometer, is given. Operational experience and performance in the first two years are described .