Angular analysis of the e+e−→D(*)±D*∓ process near the open charm threshold using initial-state radiation

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Abstract

We report a new measurement of the exclusive ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{(*)\ifmmode\pm\else\textpm\fi{}}{D}^{*\ensuremath{\mp}}$ cross sections as a function of the center-of-mass energy from the ${D}^{(*)\ifmmode\pm\else\textpm\fi{}}{D}^{*\ensuremath{\mp}}$ threshold through $\sqrt{s}=6.0\text{ }\text{ }\mathrm{GeV}$, using the initial-state radiation technique. The analysis is based on a data sample collected with the Belle detector with an integrated luminosity of $951\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. The accuracy of the cross section measurement is increased by a factor of 2 over the first Belle study. We perform the first angular analysis of the ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{*\ifmmode\pm\else\textpm\fi{}}{D}^{*\ensuremath{\mp}}$ process and decompose this exclusive cross section into three components corresponding to the ${D}^{*}$ helicities.

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