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NarimaniNaruki, M.Natkaniec, Z.Natochii, A.Nayak, L.Nayak, M.Nazaryan, G.Niiyama, M.Nisar, N. K.Nishida, S.Ogawa, S.Ono, H.Onuki, Y.Oskin, P.Oxford, E. R.Pakhlov, P.Pakhlova, G.Paladino, A.Panta, A.Paoloni, E.Pardi, S.Parham, K.Park, H.Park, S. -H.Paschen, B.Patra, S.Paul, S.Pedlar, T. K.Peschke, R.Pestotnik, R.Piccolo, M.Piilonen, Leo E.Podesta-Lerma, P. L. M.Podobnik, T.Pokharel, S.Polat, L.Praz, C.Prell, S.Prencipe, E.Rizzo, G.Rizzuto, L. B.Robertson, S. H.Roehrken, M.Roney, J. M.Rostomyan, A.Rout, N.Sanders, D. A.Sandilya, S.Santelj, L.Sato, Y.Savinov, V.Scavino, B.Schnepf, M.Schwanda, C.Seino, Y.Selce, A.Senyo, K.Serrano, J.Sevior, M. E.Sfienti, C.Shan, W.Sharma, C.Shi, X. D.Shillington, T.Shiu, J. -G.Shtol, D.Sibidanov, A.Simon, F.Singh, J. B.Skorupa, J.Sobie, R. J.Sobotzik, M.Soffer, A.Sokolov, A.Solovieva, E.Spataro, S.Spruck, B.Stari, M.Stefkova, S.Stottler, S.Stroili, R.Sumihama, M.Sutcliffe, W.Svidras, H.Takahashi, M.Takizawa, M.Tamponi, U.Tanida, K.Tenchini, F.Thaller, A.Tittel, O.Tiwary, R.Tonelli, D.Torassa, E.Trabelsi, K.Tsaklidis, I.Uchida, M.Ueda, I.Uglov, T.Unger, K.Unno, Y.Uno, K.Uno, S.Urquijo, P.Ushiroda, Y.Vahsen, S. E.van Tonder, R.Varner, G. S.Varvell, K. E.Vinokurova, A.Vismaya, V. S.Vitale, L.Vobbilisetti, V.Wach, B.Wakai, M.Wakeling, H. M.Wallner, S.Wang, E.Wang, M. -Z.Wang, L.Wang, Z.Warburton, A.Watanabe, M.Watanuki, S.Welsch, M.Wessel, C.Won, E.Xu, P.Yabsley, B. D.Yamada, S.Yan, W.Yang, S. B.Yin, J. H.Yook, Y. M.Yoshihara, K.Yuan, C. Z.Yusa, Y.Zani, L.Zhilich, V.Zhou, J. S.Zhou, Q. D.Zhukova, V. I.2023-12-082023-12-082023-06-292023-06-292470-0010https://hdl.handle.net/10919/117150We 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-→cc¯ 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 γ(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.15 page(s)enIn CopyrightScience & TechnologyPhysical SciencesAstronomy & AstrophysicsPhysics, Particles & FieldsPhysicsB-S(0)SEARCH5106 Nuclear and Plasma Physics5107 Particle and High Energy Physics4902 Mathematical Physics49 Mathematical Sciences51 Physical SciencesArticle - Refereedhttps://doi.org/10.1103/PhysRevD.107.11201010711Piilonen, Leo [0000-0001-6836-0748]2470-0029