We measure the lifetime of the D-s(+) meson using a data sample of 207 fb(-1) collected by the Belle II experiment running at the SuperKEKB asymmetric-energy e(+)e(- )collider. The lifetime is determined by fitting the decay-time distribution of a sample of 116x10(3) D-s(+)->phi pi+ decays. Our result is tau(+)(Ds)=(499.5 +/- 1.7 +/- 0.9) fs, where the first uncertainty is statistical and the second is systematic. This result is significantly more precise than previous measurements.
Adachi, I., Aggarwal, L., Aihara, H., Akopov, N., Aloisio, A., Anh Ky, N., et al. (2023). Precise Measurement of the D_{s}^{+} Lifetime at Belle II. PHYSICAL REVIEW LETTERS, 131(17), 171803-1-171803-7 [10.1103/PhysRevLett.131.171803].
Precise Measurement of the D_{s}^{+} Lifetime at Belle II
Branchini, PMembro del Collaboration Group
;Budano, AMembro del Collaboration Group
;Bussino, SMembro del Collaboration Group
;De Pietro, GMembro del Collaboration Group
;Laurenza, MMembro del Collaboration Group
;Martellini, CMembro del Collaboration Group
;Martini, AMembro del Collaboration Group
;
2023-01-01
Abstract
We measure the lifetime of the D-s(+) meson using a data sample of 207 fb(-1) collected by the Belle II experiment running at the SuperKEKB asymmetric-energy e(+)e(- )collider. The lifetime is determined by fitting the decay-time distribution of a sample of 116x10(3) D-s(+)->phi pi+ decays. Our result is tau(+)(Ds)=(499.5 +/- 1.7 +/- 0.9) fs, where the first uncertainty is statistical and the second is systematic. This result is significantly more precise than previous measurements.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
