Resonant behaviour in double charge exchange reaction of π^+ mesons on the nuclear photoemulsion

Details Resonant behaviour in double charge exchange reaction of π^+ mesons on the nuclear photoemulsion Resonant behaviour in double charge exchange reaction of π^+ mesons on the nuclear photoemulsion

2005-12-23

arxiv.org/abs/hep-ph/0512312v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 5 figures, revised version

Scientific paper

10.1140/epja/i2006-10010-4

The invariant mass spectra of the $pp\pi^-$ and $pp$ systems produced in the double charge exchange (DCX) of positively charged pions on photoemulsion are analysed. A pronounced peak is observed in the $pp\pi^-$ invariant mass spectrum, while the $M_{pp}$ spectrum exhibits a strong Migdal-Watson effect of the proton-proton final state interaction. These findings are in favor of the $NN$-decoupled $NN\pi$ pseudoscalar resonance with T=0 called $d'$.

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