Distinguishing Spins in Decay Chains at the Large Hadron Collider.
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Authors
Athanasiou, Christiana
Lester, Christopher G
Smillie, Jennifer M
Webber, Bryan R
Abstract
If new particles are discovered at the LHC, it will be important to determine their spins in as model-independent a way as possible. We consider the case, commonly encountered in models of physics beyond the Standard Model, of a new scalar or fermion D decaying sequentially into other new particles C,B,A via the decay chain D → Cq, C → Blnear, B → Alfar, lnear and lfar being opposite-sign same-flavour charged leptons and A being invisible. We compute the observable 2- and 3-particle invariant mass distributions for all possible spin assignments of the new particles, and discuss their distinguishability using a quantitative measure known as the Kullback-Leibler distance.
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Keywords
Hadronic Colliders, Beyond Standard Model, Supersymmetry Phenomenology, Large Extra Dimensions.
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High Energy Physics, Cavendish Laboratory, University of Cambridge