Interference effects from inclusive resonance production

If pions produced at high-energy reactions are decay products of narrow resonances, Bose interference effects at small invariant pion-pion masses are model-independently calculable from (inclusive) resonance production cross sections. We find that the π^?π^? correlations due to the analogue of the Hanbury Brown-Twiss effect are narrower than those currently observed, the latter being due to more complicated interferences.