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Published December 15, 2009 | public
Journal Article

Intercalibration of the CMS Electromagnetic Calorimeter with Neutral Pion Decays

Gataullin, M.

Abstract

In order to fully exploit the physics reach of the CMS experiment, it will be necessary to perform a precise in situ calibration of the CMS electromagnetic calorimeter. Achieving the design-goal calibration precision of 0.5% will be especially critical for a possible Higgs boson discovery in the two-photon decay channel. In this paper we evaluate the potential of a novel calibration technique that makes use of photon pairs produced in neutral pion decays. We show that 95% of the barrel electromagnetic calorimeter can be calibrated to at least 1% (0.5%) precision after several days (weeks) of data-taking in the luminosity scenario of L = 2∙10^(33) cm^(-2) s^(-1). Furthermore, this calibration technique has been successfully tested in the π^− test beam runs, where the obtained calibration precision of 1% was found to be in good agreement with the Monte Carlo predictions.

Additional Information

© 2009 Elsevier. Available online 21 February 2010. I would like to thank all my colleagues from the CMS ECAL collaboration. This work was supported in part by the U.S. Department of Energy Grant No. DE-FG03-92-ER40701.

Additional details

Created:
August 19, 2023
Modified:
October 20, 2023