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OpenStudy (anonymous):

Help please! 1. How can we have different "particles" with the same quark constituents ? 2. a ρ0 decays by the strong force into π+π−, which leaves a resonance with an energy width of 150 MeV. What would its lifetime be estimated as? 3.Why would it be impossible to measure the lifetime of a weakly decaying state from measure- ments of the decay width?

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