Distinguishing spins in decay chains at the Large Hadron Collider

Athanasiou, C.; Lester, C.G.; Smillie, J.M.; Webber, B.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.

Citation

Athanasiou, C., Lester, C., Smillie, J., & Webber, B. (2006). Distinguishing spins in decay chains at the Large Hadron Collider. Journal of High Energy Physics, 2006(08), https://doi.org/10.1088/1126-6708/2006/08/055

• Journal Article Type: Article
• Publication Date: Aug 23, 2006
• Deposit Date: May 8, 2008
• Journal: Journal of High Energy Physics
• Print ISSN: 1126-6708
• Electronic ISSN: 1029-8479
• Publisher: Scuola Internazionale Superiore di Studi Avanzati (SISSA)
• Peer Reviewed: Peer Reviewed
• Volume: 2006
• Issue: 08
• DOI: https://doi.org/10.1088/1126-6708/2006/08/055
• Keywords: Large extra dimensions, Supersymmetry phenomenology, Beyond standard model, Hadronic colliders.
• Public URL: https://durham-repository.worktribe.com/output/1535123
• Publisher URL: http://www.iop.org/EJ/abstract/1126-6708/2006/08/055