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

WASA-at-COSY Collaboration

Результат исследования: Научные публикации в периодических изданияхстатья

2 Цитирования (Scopus)

Аннотация

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.

Язык оригиналаанглийский
Страницы (с-по)645-650
Число страниц6
ЖурналPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Том781
DOI
СостояниеОпубликовано - 10 июн 2018

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