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新山 雅之 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 発行・発表の年月 | 2021/08 |
| 形態種別 | その他 |
| 標題 | Precise measurement of the $D^0$ and $D^+$ lifetimes at Belle II |
| 執筆形態 | その他 |
| 著者・共著者 | 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 |
| 概要 | 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. |
| DOI | 10.1103/PhysRevLett.127.211801 |
| PermalinkURL | http://arxiv.org/abs/2108.03216v2 |
| researchmap用URL | http://arxiv.org/pdf/2108.03216v2 |