Abstract
We propose a new algorithm for the identification of the production flavor of neutral D mesons in the Belle II experiment. The algorithm exploits the correlation between the flavor of a reconstructed neutral D meson (signal D meson) and the electric charges of particles reconstructed in the rest of the e(+)e(-) -> c (c) over tilde event.
These include those originating from the decay of the other charm hadron produced in the event, as well as those possibly produced in association with the signal D meson. We develop the algorithm using simulation and calibrate it in data using decay modes that identify the flavor of the decaying neutral D meson.
We use a data sample of e(+)e(-) collisions, corresponding to 362 fb(-1) of integrated luminosity, collected by Belle II at center-of-mass energies near the gamma(4S) mass. The effective tagging efficiency in data is (47.91 +/- 0.07(stat) +/- 0.51(syst))%, independent of the neutral-D-meson decay mode.
This charm flavor tagger will approximately double the effective sample size of many CP-violation and charm-mixing measurements that so far have exclusively relied on neutral D mesons originating from D*(+/-) decays. While developed for Belle II, the basic principles underlying the charm flavor tagger can be used in other experiments, including those at hadron colliders.