Author:
Achasov M. N.,Barnyakov A. Yu.,Baykov A. A.,Beloborodov K. I.,Berdyugin A. V.,Berkaev D. E.,Bogdanchikov A. G.,Botov A. A.,Dimova T. V.,Druzhinin V. P.,Golubev V. B.,Kirpotin A. N.,Kardapoltsev L. V.,Kasaev A. S.,Kharlamov A. G.,Koop I. A.,Korol A. A.,Kovrizhin D. P.,Kupich A. S.,Martin K. A.,Melnikova N. A.,Muchnoy N. Yu.,Obrazovsky A. E.,Pakhtusova E. V.,Pugachev K. V.,Rabusov D. V.,Rogovsky Yu. A.,Savchenko Y. S.,Senchenko A. I.,Serednyakov S. I.,Shatilov D. N.,Shatunov Yu. M.,Shtol D. A.,Shwartz D. B.,Silagadze Z. K.,Surin I. K.,Timoshenko M. V.,Usov Yu. V.,Zhabin V. N.,Zhulanov V. V.
Abstract
AbstractThe process $$e^+e^-\rightarrow \eta \pi ^0\gamma $$
e
+
e
-
→
η
π
0
γ
is studied in the center-of-mass energy range 1.05–2.00 GeV using data with an integrated luminosity of 94.5 $$\hbox {pb}^{-1}$$
pb
-
1
collected by the SND detector at the VEPP-2000 $$e^{+}e^{-}$$
e
+
e
-
collider. The $$e^+e^-\rightarrow \eta \pi ^0\gamma $$
e
+
e
-
→
η
π
0
γ
cross section is measured for the first time. It is shown that the dominant mechanism of this reaction is the transition through the $$\omega \eta $$
ω
η
intermediate state. The measured cross section of the subprocess $$e^+e^-\rightarrow \omega \eta \rightarrow \eta \pi ^0\gamma $$
e
+
e
-
→
ω
η
→
η
π
0
γ
is consistent with previous measurements in the $$e^+e^-\rightarrow \pi ^+\pi ^-\pi ^0\eta $$
e
+
e
-
→
π
+
π
-
π
0
η
mode. It is found, with a significance of $$5.6\sigma $$
5.6
σ
, that the process $$e^+e^-\rightarrow \eta \pi ^0\gamma $$
e
+
e
-
→
η
π
0
γ
is not completely described by hadronic vector-pseudoscalar intermediate states. The cross section of this missing contribution, which can originate from radiation processes, e. g. $$e^+e^-\rightarrow a_{0}(1450)\gamma $$
e
+
e
-
→
a
0
(
1450
)
γ
, is measured. It is found to be 15–20 pb in the wide energy range from 1.3 to 1.9 GeV.
Publisher
Springer Science and Business Media LLC
Subject
Physics and Astronomy (miscellaneous),Engineering (miscellaneous)
Reference32 articles.
1. M.N. Achasov et al. [SND Collaboration], The $$\phi \rightarrow \eta \pi ^0\gamma $$ decay. Phys. Lett. B 479, 53 (2000)
2. R.R. Akhmetshin et al. [CMD-2 Collaboration], Study of the $$\phi $$ decays into $$\pi ^0 \pi ^0 \gamma $$ and $$\eta \pi ^0 \gamma $$ final states. Phys. Lett. B 462, 380 (1999)
3. F. Ambrosino et al. [KLOE Collaboration], Study of the $$a_0(980)$$ meson via the radiative decay $$\phi \rightarrow \eta \pi _0\gamma $$ with the KLOE detector. Phys. Lett. B 681, 5 (2009)
4. R.R. Akhmetshin et al. [CMD-2 Collaboration], Study of the process $$e^+e^-\rightarrow \omega \pi ^0\rightarrow \pi ^0\pi ^0\gamma $$ in c.m. energy range 920—1380 MeV at CMD-2. Phys. Lett. B 562, 173 (2003)
5. M. Ablikim et al. [BESIII Collaboration], Observation of $$J/\psi \rightarrow \gamma \eta \pi ^{0}$$. Phys. Rev. D 94, 072005 (2016)
Cited by
4 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献