Distinguishing Spins in Decay Chains at the Large Hadron Collider

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 $D\to Cq$, $C\to B{l}^{near}$, $B\to A{l}^{far}$, $l^{near}$ and $l^{far}$ 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.

arXiv comment23 pages, 12 figures uses Feynarts; v2 has minor corrections and a new section 4.2 which includes the 3D analysis described in hep-ph/0606212; v3 has reference added and typos fixed - matches journal version; v4 corrects typo in equation B9

References in corpus (18)

• HERWIG 6.5: an event generator for Hadron Emission Reactions With Interfering Gluons (including supersymmetric processes)
• The Snowmass Points and Slopes: Benchmarks for SUSY Searches
• Radiative Corrections to Kaluza-Klein Masses
• Bosonic Supersymmetry? Getting Fooled at the LHC
• HERWIG 6.4 Release Note
• HERWIG 6.1 Release Note
• HERWIG 6.3 Release Note
• Measuring sparticle masses in non-universal string inspired models at the LHC
• Discrimination of Supersymmetry and Universal Extra Dimensions at Hadron Colliders
• Distinguishing Spins in Supersymmetric and Universal Extra Dimension Models at the Large Hadron Collider
• Determining the spin of supersymmetric particles at the LHC using lepton charge asymmetry
• Measuring slepton spin at the LHC
• Contrasting Supersymmetry and Universal Extra Dimensions at the CLIC Multi-TeV e+e- Collider
• Invariant mass distributions in cascade decays
• Radiative corrections to $b\to cτ\batν_τ$
• It's a Gluino!
• Constrained invariant mass distributions in cascade decays. The shape of the "$m_{qll}$-threshold" and similar distributions
• Study of the slepton non-universality at the CERN Large Hadron Collider

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