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First Study on the Angular Resolution of Hadronic Showers with the Combined LAr and Tile Calorimeters

By Plothow-Besch Lpc Clermont-Ferrand, H. Plothow-besch and Universit&apos

Abstract

The angular resolution of hadronic showers has been studied with the combined electromagnetic LAr and the hadronic Tile calorimeter prototypes using test beam data. The energy dependence of this angular resolution at energies of 20, 50, 100, 150, 200 and 300 GeV at an incident polar angle of ` = 11:3 o has been determined with pions at an event-to-event basis. As a preliminary result, a resolution of the polar angle for hadron showers of oe ` = ((243:1 \Sigma 8:9)= p E+ 12:1 \Sigma 0:7) mrad has been obtained, which corresponds to an angular resolution of 1:5 o at 300 GeV incident beam energy. The average polar beam angle has been reconstructed to (11:23 \Sigma 0:01) o , which agrees nicely with the incident pion polar beam angle. 1. Motivation To improve the energy measurement of jets, in particular to improve the reconstruction of masses of particles decaying into a pair of jets such as in e.g. the reconstruction of the top-quark mass or the heavy Higgs mass, the pr..

Year: 2007
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