Cross-section for the double-charge-exchange reaction π+ + 4He → π- + 4p at pion energies of 98, 135, 145 and 156 MeV

Falomkin, I.V.; Ltashenko, V. I.; Pontecorvo, G. B.; Shcherbakov, Yu.A.; Albu, Mihaela; Angelescu, T.; Balea, O.; Mihul, A.; Nichitiu, F.; Seraru, A.; Balestra, F.; Garfagnini, R.; Piragino, G.; Guaraldo, C.; Scrimaglio, E.

doi:10.1007/bf02720396

Cited by 20 publications

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“…A series of experiments in search of the d ′ has been performed at JINR [19], [20] and at TRIUMF [21], [22], where the DCX π + + 4 He → pppp π − was measured. Unlike previous experiments, DCX on 4 He results in the production of four protons in the continuum.…”

Section: ′ -Resonancementioning

confidence: 99%

Resonant behaviour in double charge exchange reaction of πmesons on the nuclear photoemulsion

et al. 2006

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The invariant mass spectra of the ppπ − 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 ppπ − 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 N N -decoupled N N π pseudoscalar resonance with T = 0 called d ′ . IntroductionIn this paper the spectrum is analysed of invariant masses of the ppπ − system, produced in Double Charge eXchange (DCX) reactions of π + -mesons on the nuclei 107 Ag and 109 Ag in photoemulsion; a peak has been revealed at M ppπ − ≈ 2.05 GeV. We consider this result to confirm the existence of the d ′ , that was proposed in order to explain the maxima exhibited by the forward angle DCX cross section πThe energy of the incident π + -mesons in the photoemulsion experiment was quite low: T π + = 40 ÷ 140 MeV, while the resolution in the invariant mass M ppπ − amounted *

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