Isoscalar single-pion production in the region of Roper and d(2380) resonances

The WASA-at-COSY Collaboration

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Exclusive measurements of the quasi-free pn→ppπ and pp→ppπ0 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=0.95–1.3 GeV (s=2.3–2.46 GeV), which includes the regions of Δ(1232), N(1440) and d(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 N(1440), the strength of which shows up isolated from the Δ resonance in the isoscalar (Nπ)I=0 invariant-mass spectrum. No evidence for a decay of the dibaryon resonance d(2380) into the isoscalar (NNπ)I=0 channel is found. An upper limit of 180 μb (90% C.L.) corresponding to a branching ratio of 9% has been deduced.

Original languageEnglish
Pages (from-to)599-607
Number of pages9
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume774
DOIs
Publication statusPublished - 10 Nov 2017

Keywords

  • Dibaryon resonance
  • Isoscalar part
  • Roper resonance
  • Single-pion production
  • PROTON-PROTON COLLISIONS
  • CROSS-SECTIONS
  • THRESHOLD
  • DECAY
  • WIDTH
  • SCATTERING
  • RANGE

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