Journal Article

FZJ-2014-04899

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Dispersive analysis for η→γγ ⋆

Hanhart, C. (Corresponding Author)FZJ* ; Kupść, A. ; Meißner, U.-G.FZJ* ; Stollenwerk, F. ; Wirzba, A.FZJ*

2013
Springer Berlin

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Please use a persistent id in citations: http://hdl.handle.net/2128/8368  doi:10.1140/epjc/s10052-013-2668-3

Abstract: A dispersion integral is derived that connects data on η→π+π−γ to the η→γγ∗ transition form factor. A detailed analysis of the uncertainties is provided. We find for the slope of the η transition form factor at the origin bη=(2.05+0.22−0.10)GeV−2. Using an additional, plausible assumption, one finds for the corresponding slope of the η′ transition form factor, bη′=(1.58+0.15−0.08)GeV−2. Both values are consistent with all recent data, but differ from some previous theoretical analyses.

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Contributing Institute(s):

1. Theorie der Starken Wechselwirkung (IAS-4)
2. Theorie der starken Wechselwirkung (IKP-3)

Research Program(s):

1. 531 - Hadron Structure and Dynamics (HSD) (POF2-531) (POF2-531)
2. DFG project 196253076 - TRR 110: Symmetrien und Strukturbildung in der Quantenchromodynamik (196253076) (196253076)

Appears in the scientific report 2014

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Database coverage:
; ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection ; Zoological Record

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