What is the difference between a resonance found during a particle experiment and a particle?

11 November 2015 1 5K Report

what is the difference between a resonance found during a particle experiment and a particle?

This is an interesting question. A `resonance' in a particle scattering experiment (say A+B-->C+D) is a short lived virtual intermediate state having an allowed vertex with final state particles(C and D). Particle production shows a pronounced peak (in a scattering experiment) when the mandelstam variable s=(pA+pB)2 is equal to the mass square of intermediate state. If the resonance is wide then the intermediate state decays faster than if it is a narrow resonance; which is in accordance with the time energy uncertainty relation ΔE Δt ≈ h/2π.

Example π+ + p → Δ++ → π+ + p

Recently LHC experiment searched for resonances in the di-photon final state. Preliminary results of this search was released by both CMS and ATLAS group in December 2015. Excess data with respect to background was reported by both the experiments at a di-photon invariant mass of 750 GeV.

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