FOCUS Document 775-v14

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A Measurement of the Ds+ Lifetime

Document #:
FOCUS-doc-775-v14
Document type:
Publication
Submitted by:
Harry Cheung
Updated by:
Harry Cheung
Document Created:
02 Nov 2004, 18:35
Contents Revised:
23 Aug 2005, 14:00
Metadata Revised:
23 Aug 2005, 14:00
Actually Revised:
23 Aug 2005, 14:59
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Abstract:
A high statistics measurement of the $D_s^+$ lifetime from the Fermilab fixed-target FOCUS photoproduction experiment is presented. We describe the analysis of the two decay modes, $D_s^+\rightarrow \phi^0\pi^+$ and $D_s^+\rightarrow \overline{K}^{\ast 0}K^+$, used for the measurement. The measured lifetime is $507.4\pm 5.1~(\mathrm{stat.}) \pm 4.8~(\mathrm{syst.})$~fs using $8961\pm 105$ $D_s^+\rightarrow \phi^0\pi^+$ and $4680\pm 90$ $D_s^+\rightarrow \overline{K}^{\ast 0}K^+$ decays. This a significant improvement over the present world average.
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  • PS (prl_ds_ltime.ps, 229.0 kB)
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Published in hep-ex/0504056.
Published in Phys. Rev. Lett. vol. 95 pg. 052003.
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