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T: Fachverband Teilchenphysik

T 74: Experimentelle Methoden 1

T 74.1: Vortrag

Montag, 27. Februar 2012, 16:45–17:00, VG 0.111

Absolute luminosity measurement at LHCb with beam-gas imaging — •Colin Barschel — CERN, CH-1211 Genève 23, Switzerland

A novel technique to measure the absolute luminosity at the Large Hadron Collider (LHC) using beam-gas interactions has been successfully used in the LHCb experiment. The Beam-Gas Imaging method (BGI) has the potential to surpass the accuracy of the commonly used *van der Meer scan* method (VDM) but has been limited by the low statistic so far. A new device has been installed in the LHCb experiment to increase the pressure around the interaction point by mean of gas injection during dedicated fills.

This talk presents the principles of the gas injection and the improvements expected with the increased pressure. Furthermore the gas injection will now help to evaluate the so-called ghost charges and also to better quantify the intensities per bunch. Those uncertainties are becoming the dominating factor because the uncertainty on the total beam current have been reduced.