Distinguishing Spins in Decay Chains at the Large Hadron Collider

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dc.creatorAthanasiou, Christiana
dc.creatorLester, Christopher G.
dc.creatorSmillie, Jennifer M.
dc.creatorWebber, Bryan R.
dc.date2006-05-26
dc.date2008-08-29
dc.date.accessioned2026-07-07T10:41:39Z
dc.date.available2026-07-07T10:41:39Z
dc.descriptionIf 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 $D\to C q$, $C\to B l^{near}$, $B\to A l^{far}$, $l^{near}$ 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.
dc.description23 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
dc.identifierhttps://arxiv.org/abs/hep-ph/0605286
dc.identifierhttp://arxiv.org/abs/hep-ph/0605286
dc.identifierJHEP0608:055,2006
dc.identifierdoi:10.1088/1126-6708/2006/08/055
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/181686
dc.subjectHigh Energy Physics - Phenomenology
dc.titleDistinguishing Spins in Decay Chains at the Large Hadron Collider
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