Measurement of SUSY masses via cascade decays for SPS 1a

Gjelsten, B.K., Miller, D.J. and Osland, P. (2004) Measurement of SUSY masses via cascade decays for SPS 1a. Journal of High Energy Physics, 2004(12), 003. (doi: 10.1088/1126-6708/2004/12/003)




If R-parity conserving supersymmetry exists below the TeV-scale, new particles will be produced and decay in cascades at the LHC. The lightest supersymmetric particle will escape the detectors, thereby complicating the full reconstruction of the decay chains. In this paper we expand on existing methods for determining the masses of the particles in the cascade from endpoints of kinematical distributions. We perform scans in the mSUGRA parameter space to delimit the region where this method is applicable. From the examination of theoretical distributions for a wide selection of mass scenarios it is found that caution must be exerted when equating the theoretical endpoints with the experimentally obtainable ones. We provide analytic formulae for the masses in terms of the endpoints most readily available. Complications due to the composite nature of the endpoint expressions are discussed in relation to the detailed analysis of two points on the SPS 1a line. Finally we demonstrate how a Linear Collider measurement can improve dramatically on the precision of the masses obtained.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Miller, Dr David
Authors: Gjelsten, B.K., Miller, D.J., and Osland, P.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of High Energy Physics
Copyright Holders:Copyright © 2005 SISSA/ISAS
First Published:First published in Journal of High Energy Physics 12(2004):003
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher.
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
389601A phenomenological investigation of physics beyond the standard model at the next generation of collidersDavid MillerParticle Physics & Astronomy Research Council (PPARC)PP/C 502722/1P&A - PHYSICS & ASTRONOMY