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arXiv · 2108.03216

Precise measurement of the $D^0$ and $D^+$ lifetimes at Belle II

Belle II collaboration·F. Abudinén·I. Adachi·K. Adamczyk·L. Aggarwal·H. Ahmed·H. Aihara·N. Akopov·A. Aloisio·N. Anh Ky·D. M. Asner·H. Atmacan·V. Aushev·V. Babu·S. Bacher·H. Bae·S. Baehr·S. Bahinipati·P. Bambade·Sw. Banerjee·S. Bansal·M. Barrett·J. Baudot·M. Bauer·A. Baur·J. Becker·P. K. Behera·J. V. Bennett·E. Bernieri·F. U. Bernlochner·M. Bertemes·E. Bertholet·M. Bessner·S. Bettarini·V. Bhardwaj·F. Bianchi·T. Bilka·S. Bilokin·D. Biswas·A. Bobrov·D. Bodrov·A. Bolz·A. Bozek·M. Bračko·P. Branchini·N. Braun·R. A. Briere·T. E. Browder·A. Budano·S. Bussino·M. Campajola·L. Cao·G. Casarosa·C. Cecchi·D. Červenkov·M. -C. Chang·P. Chang·R. Cheaib·V. Chekelian·C. Chen·Y. -T. Chen·B. G. Cheon·K. Chilikin·K. Chirapatpimol·H. -E. Cho·K. Cho·S. -J. Cho·S. -K. Choi·S. Choudhury·D. Cinabro·L. Corona·L. M. Cremaldi·S. Cunliffe·T. Czank·F. Dattola·E. De La Cruz-Burelo·G. de Marino·G. De Nardo·G. De Pietro·R. de Sangro·M. Destefanis·S. Dey·A. De Yta-Hernandez·A. Di Canto·F. Di Capua·J. Dingfelder·Z. Doležal·I. Domínguez Jiménez·T. V. Dong·M. Dorigo·K. Dort·D. Dossett·S. Dubey·S. Duell·G. Dujany·P. Ecker·D. Epifanov·T. Ferber·D. Ferlewicz·G. Finocchiaro
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Abstract

We report a measurement of the $D^0$ and $D^+$ lifetimes using $D^0\to K^-\pi^+$ and $D^+\to K^-\pi^+\pi^+$ decays reconstructed in $e^+e^-\to c\bar{c}$ data recorded by the Belle II experiment at the SuperKEKB asymmetric-energy $e^+e^-$ collider. The data, collected at center-of-mass energies at or near the $\Upsilon(4S)$ resonance, correspond to an integrated luminosity of $72\,{\rm fb}^{-1}$. The results, $\tau(D^0) = 410.5\pm1.1\,{\rm(stat)}\pm0.8\,{\rm(syst.)}\,{\rm fs}$ and $\tau(D^+) = 1030.4\pm4.7\,{\rm(stat)}\pm3.1\,{\rm(syst.)}\,{\rm fs}$, are the most precise to date and are consistent with previous determinations.

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Belle II collaboration, F. Abudinén, I. Adachi, K. Adamczyk, L. Aggarwal, H. Ahmed, H. Aihara, N. Akopov, A. Aloisio, N. Anh Ky, D. M. Asner, H. Atmacan, V. Aushev, V. Babu, S. Bacher, H. Bae, S. Baehr, S. Bahinipati, P. Bambade, Sw. Banerjee, S. Bansal, M. Barrett, J. Baudot, M. Bauer, A. Baur, J. Becker, P. K. Behera, J. V. Bennett, E. Bernieri, F. U. Bernlochner, M. Bertemes, E. Bertholet, M. Bessner, S. Bettarini, V. Bhardwaj, F. Bianchi, T. Bilka, S. Bilokin, D. Biswas, A. Bobrov, D. Bodrov, A. Bolz, A. Bozek, M. Bračko, P. Branchini, N. Braun, R. A. Briere, T. E. Browder, A. Budano, S. Bussino, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, D. Červenkov, M. -C. Chang, P. Chang, R. Cheaib, V. Chekelian, C. Chen, Y. -T. Chen, B. G. Cheon, K. Chilikin, K. Chirapatpimol, H. -E. Cho, K. Cho, S. -J. Cho, S. -K. Choi, S. Choudhury, D. Cinabro, L. Corona, L. M. Cremaldi, S. Cunliffe, T. Czank, F. Dattola, E. De La Cruz-Burelo, G. de Marino, G. De Nardo, G. De Pietro, R. de Sangro, M. Destefanis, S. Dey, A. De Yta-Hernandez, A. Di Canto, F. Di Capua, J. Dingfelder, Z. Doležal, I. Domínguez Jiménez, T. V. Dong, M. Dorigo, K. Dort, D. Dossett, S. Dubey, S. Duell, G. Dujany, P. Ecker, D. Epifanov, T. Ferber, D. Ferlewicz, G. Finocchiaro. 2021-08-06. Precise measurement of the $D^0$ and $D^+$ lifetimes at Belle II. https://doi.org/10.1103/physrevlett.127.211801

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