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Article

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

Pakhlova G., Pakhlov P., Аушев Т. А., Mizuk R., Углов Т. В.

We report a new measurement of the exclusive e+e-→D(∗)±D∗ cross sections as a function of the center-of-mass energy from the D(∗)±D∗ threshold through s=6.0 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 fb-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-→D∗±D∗ process and decompose this exclusive cross section into three components corresponding to the D∗ helicities. © 2018 authors. Published by the American Physical Society.