Comment on a Narrow Meson Resonance at 1932 MeV

1975 ◽  
Vol 34 (18) ◽  
pp. 1201-1204 ◽  
Author(s):  
D. Weingarten ◽  
S. Okubo
Keyword(s):  
Meson Resonance

scholarly journals Hadronic vacuum polarization and vector-meson resonance parameters from $$\varvec{e^+e^-\rightarrow \pi ^0\gamma }$$

2020 ◽  
Vol 80 (10) ◽  
Author(s):  
Bai-Long Hoid ◽  
Martin Hoferichter ◽  
Bastian Kubis
Keyword(s):  
Transition Form Factor ◽  
Vacuum Polarization ◽  
Transition Form ◽  
Isospin Breaking ◽  
Meson Resonance ◽  
Resonance Parameters ◽  
Polarization Correction ◽  
Dispersive Representation ◽  
The Masses ◽  
Good Agreement

AbstractWe study the reaction $$e^+e^-\rightarrow \pi ^0\gamma $$ e + e - → π 0 γ based on a dispersive representation of the underlying $$\pi ^0\rightarrow \gamma \gamma ^*$$ π 0 → γ γ ∗ transition form factor. As a first application, we evaluate the contribution of the $$\pi ^0\gamma $$ π 0 γ channel to the hadronic-vacuum-polarization correction to the anomalous magnetic moment of the muon. We find $$a_\mu ^{\pi ^0\gamma }\big |_{\le 1.35\,\text {GeV}}=43.8(6)\times 10^{-11}$$ a μ π 0 γ | ≤ 1.35 GeV = 43.8 ( 6 ) × 10 - 11 , in line with evaluations from the direct integration of the data. Second, our fit determines the resonance parameters of $$\omega $$ ω and $$\phi $$ ϕ . We observe good agreement with the $$e^+e^-\rightarrow 3\pi $$ e + e - → 3 π channel, explaining a previous tension in the $$\omega $$ ω mass between $$\pi ^0\gamma $$ π 0 γ and $$3\pi $$ 3 π by an unphysical phase in the fit function. Combining both channels we find $${\bar{M}}_\omega =782.736(24)\,\text {MeV}$$ M ¯ ω = 782.736 ( 24 ) MeV and $${\bar{M}}_\phi =1019.457(20)\,\text {MeV}$$ M ¯ ϕ = 1019.457 ( 20 ) MeV for the masses including vacuum-polarization corrections. The $$\phi $$ ϕ mass agrees perfectly with the PDG average, which is dominated by determinations from the $${\bar{K}} K$$ K ¯ K channel, demonstrating consistency with $$3\pi $$ 3 π and $$\pi ^0\gamma $$ π 0 γ . For the $$\omega $$ ω mass, our result is consistent but more precise, exacerbating tensions with the $$\omega $$ ω mass extracted via isospin-breaking effects from the $$2\pi $$ 2 π channel.

scholarly journals Observation of a spin 4, isospin 1, meson resonance

1978 ◽  
Vol 74 (4-5) ◽  
pp. 413-416 ◽  
Author(s):  
R. Baldi ◽  
T. Böhringer ◽  
P.A. Dorsaz ◽  
V. Hungerbühler ◽  
M.N. Kienzle-Focacci ◽  
...  
Keyword(s):  
Meson Resonance

High mass meson resonance production in pp interactions at 405 GeV/c

1980 ◽  
Vol 172 ◽  
pp. 327-334 ◽  
Author(s):  
A. Suzuki ◽  
M. Fukawa ◽  
S. Kabe ◽  
H. Kichimi ◽  
F. Ochiai ◽  
...  
Keyword(s):  
High Mass ◽  
Resonance Production ◽  
Meson Resonance

Evidence for a New Meson Resonance at 2340 MeV

1975 ◽  
Vol 35 (14) ◽  
pp. 891-894 ◽  
Author(s):  
C. Baltay ◽  
C. V. Cautis ◽  
D. Cohen ◽  
M. Kalelkar ◽  
D. Pisello ◽  
...  
Keyword(s):  
Meson Resonance

scholarly journals Isoscalar ππ Scattering and the σ Meson Resonance from QCD

2017 ◽  
Vol 118 (2) ◽  
Author(s):  
Raul A. Briceño ◽  
Jozef J. Dudek ◽  
Robert G. Edwards ◽  
David J. Wilson ◽  
Keyword(s):  
Meson Resonance

scholarly journals ππ scattering and the meson resonance spectrum

1998 ◽  
Vol 1 (3) ◽  
pp. 337-346 ◽  
Author(s):  
W.M. Kloet ◽  
B. Loiseau
Keyword(s):  
Resonance Spectrum ◽  
Meson Resonance

An investigation of narrow meson resonance production in antiproton-proton and antiproton-neutron interactions At 6.1 and 8.9 GeV/c

1984 ◽  
Vol 244 (2) ◽  
pp. 277-312 ◽  
Author(s):  
F. Azooz ◽  
I. Butterworth ◽  
P.J. Dornan ◽  
G. Hall ◽  
R.A. Stern ◽  
...  
Keyword(s):  
Resonance Production ◽  
Meson Resonance

Inclusive meson resonance production inK + p interactions at 250 GeV/c

1989 ◽  
Vol 41 (4) ◽  
pp. 539-555 ◽  
Author(s):  
◽  
N. M. Agababyan ◽  
I. V. Ajinenko ◽  
Yu. A. Belokopytov ◽  
H. Boettcher ◽  
...  
Keyword(s):  
Resonance Production ◽  
Meson Resonance
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