Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8187295 | Physics Letters B | 2017 | 9 Pages |
Abstract
Exclusive measurements of the quasi-free pnâppÏâ and ppâppÏ0 reactions have been performed by means of pd collisions at Tp=1.2 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region Tp=0.95-1.3GeV (s=2.3-2.46 GeV), which includes the regions of Î(1232), Nâ(1440) and dâ(2380) resonance excitations. From these measurements the isoscalar single-pion production has been extracted, for which data existed so far only below Tp=1 GeV. We observe a substantial increase of this cross section around 1 GeV, which can be related to the Roper resonance Nâ(1440), the strength of which shows up isolated from the Î resonance in the isoscalar (NÏ)I=0 invariant-mass spectrum. No evidence for a decay of the dibaryon resonance dâ(2380) into the isoscalar (NNÏ)I=0 channel is found. An upper limit of 180 μb (90% C.L.) corresponding to a branching ratio of 9% has been deduced.
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