Letters in High Energy Physics | |
Applying New Physics to the Problems of the \(\eta′\to\pi^0\gamma\gamma\) Decay | |
Yaroslav Balytskyi1  | |
[1] UCCS; | |
关键词: Dark Photon; Rare Decays; VMD; ChPT; LσM; unitarity conditions; | |
DOI : 10.31526/lhep.2020.156 | |
来源: DOAJ |
【 摘 要 】
Rare decays of light mesons may be a discovery window for a new weakly coupled forces hidden at a low-energy QCD scale. BES-III Collaboration reported an observation of the rare decay \(\eta' \to\pi^0\gamma\gamma\). The observed decay width disagrees with the preliminary theoretical estimates. We show that this tension may be attributed to New Physics, presumably Dark Photon. For completeness, we consider a possible influence of New Physics on a similar well-measured decay \(\eta \to\pi^0\gamma\gamma\) and a recently measured one, \(\eta' \to\eta\gamma\gamma\), showing that the impact of the hypothetical Dark Photon may be also present in these decays.
【 授权许可】
Unknown