Importance of d-wave contributions in the charge symmetry breaking reaction dd→4Heπ0

The WASA-at-COSY Collaboration

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

This letter reports a first quantitative analysis of the contribution of higher partial waves in the charge symmetry breaking reaction dd→4Heπ0 using the WASA-at-COSY detector setup at an excess energy of Q=60MeV. The determined differential cross section can be parametrized as dσ/dΩ=a+bcos2⁡θ, where θ is the production angle of the pion in the center-of-mass coordinate system, and the results for the parameters are a=(1.55±0.46(stat)+0.32 −0.8(syst))pb/sr and b=(13.1±2.1(stat)−2.7 +1.0(syst))pb/sr. The data are compatible with vanishing p-waves and a sizable d-wave contribution. This finding should strongly constrain the contribution of the Δ isobar to the dd→4Heπ0 reaction and is, therefore, crucial for a quantitative understanding of quark mass effects in nuclear production reactions.

Original languageEnglish
Pages (from-to)645-650
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume781
DOIs
Publication statusPublished - 10 Jun 2018

Keywords

  • Charge symmetry breaking
  • Deuteron–deuteron interactions
  • Pion production
  • NEAR-THRESHOLD
  • Deuteron deuteron interactions
  • MESON PRODUCTION
  • QUARK MASSES
  • COSY
  • COLLISIONS

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