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A New Look at the Scalar Meson \(f_0(500)\) via \(D^+\to π^+π^-\ell^+ν_\ell\) Decays

By Besiii Collaboration and others
Using \(2.93~\mathrm{fb}^{-1}\) of \(e^+e^-\) collision data collected with the BESIII detector at the center-of-mass energy of 3.773 GeV, we investigate the semileptonic decays \(D^+\to \pi^+\pi^- \ell^+\nu_\ell\) (\(\ell=e\) and \(\mu\)). The \(D^+\to f_0(500)\mu^+\nu_\mu\) decay is observed for the first time. By analyzing simultaneously the differential decay rates of \(D^+\to f_0(500) \mu^+\nu_\mu\)... Show more
February 5, 2024
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