Invariant mass distributions in cascade decays

Miller, D.J., Osland, P. and Raklev, A. (2006) Invariant mass distributions in cascade decays. Journal of High Energy Physics, 2006, 034. (doi: 10.1088/1126-6708/2006/03/034)

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We derive analytical expressions for the shape of the invariant mass distributions of massless Standard Model endproducts in cascade decays involving massive New Physics (NP) particles, D→Cc→Bbc→Aabc, where the final NP particle A in the cascade is unobserved and where two of the particles a, b, c may be indistinguishable. Knowledge of these expressions can improve the determination of NP parameters at the LHC. The shape formulas are composite, but contain nothing more complicated than logarithms of simple expressions. We study the effects of cuts, final state radiation and detector effects on the distributions through Monte Carlo simulations, using a supersymmetric model as an example. We also consider how one can deal with the width of NP particles and with combinatorics from the misidentification of final state particles. The possible mismeasurements of NP masses through ``feet'' in the distributions are discussed. Finally, we demonstrate how the effects of different spin configurations can be included in the distributions.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Miller, Dr David
Authors: Miller, D.J., Osland, P., and Raklev, A.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of High Energy Physics
Publisher:IOP Publishing
ISSN (Online):1029-8479
Published Online:09 March 2006

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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