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The European Physical Journal C

, Volume 56, Issue 3, pp 449–460

First Online: 30 July 2008Received: 06 February 2008Revised: 03 July 2008


The powerful muon and tracker systems of the CMS detector together with dedicated reconstruction software allow precise and efficient measurement of muon tracks originating from proton-proton collisions. The standard muon reconstruction algorithms, however, are inadequate to deal with muons that do not originate from collisions. This note discusses the design, implementation, and performance results of a dedicated cosmic muon track reconstruction algorithm, which features pattern recognition optimized for muons that are not coming from the interaction point, i.e., cosmic muons and beam-halo muons. To evaluate the performance of the new algorithm, data taken during Cosmic Challenge phases I and II were studied and compared with simulated cosmic data. In addition, a variety of more general topologies of cosmic muons and beam-halo muons were studied using simulated data to demonstrate some key features of the new algorithm.

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Autor: Chang Liu - Norbert Neumeister - Nicola Amapane - Cristina Fernandez Bedoya - Riccardo Bellan - Philipp Biallass - Sara Bo


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