A Review of Spin Determination at the LHC

Details A Review of Spin Determination at the LHC A Review of Spin Determination at the LHC

2008-02-19

arxiv.org/abs/0802.2726v1

Int.J.Mod.Phys.A23:4647-4668,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

To appear in "Perspectives on the LHC", edited by G. Kane and A. Pierce

Scientific paper

10.1142/S0217751X08042778

Spin measurements are crucial in distinguishing major scenarios of TeV scale new physics once it is discovered at the LHC. We give a brief survey of methods of measuring the spin of new physics particles at the LHC. We focus on the case in which a long lived massive neutral particle is produced at the end of every cascade decay and escape detection. This is the case for R-parity preserving supersymmetry, Little Higgs models with T-parity, extra-dimensional models with KK-parity, and a large class of similar models and scenarios. After briefly commenting on measuring spin by combining mass and rate information, we concentrate on direct measurement by observing angular correlations among decay products of the new physics particles. We survey a wide range of possible channels, discuss the construction of possible correlation variables, and outline experimental challenges. We also briefly survey the Monte-Carlo tools which are useful in studying such correlations.

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