Precise Measurement of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>D</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>D</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math> Lifetimes at Belle II
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, K. Flood
Abstract
We report a measurement of the ${D}^{0}$ and ${D}^{+}$ lifetimes using ${D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ and ${D}^{+}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}$ decays reconstructed in ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}c\overline{c}$ data recorded by the Belle II experiment at the SuperKEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. The data, collected at center-of-mass energies at or near the $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance, correspond to an integrated luminosity of $72\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. The results, $\ensuremath{\tau}({D}^{0})=410.5\ifmmode\pm\else\textpm\fi{}1.1(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.8(\mathrm{syst})\text{ }\text{ }\mathrm{fs}$ and $\ensuremath{\tau}({D}^{+})=1030.4\ifmmode\pm\else\textpm\fi{}4.7(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}3.1(\mathrm{syst})\text{ }\text{ }\mathrm{fs}$, are the most precise to date and are consistent with previous determinations.