Lifetime Measurements of the Three Charmed Pseudoscalar d Mesons
- UC, Santa Barbara
The lifetimes of the $D^0, D^+$, and $$D^+_s$$ mesons were measured using high resolution silicon microstrip detectors in an experiment at FNAL. The experiment was performed in a Tagged Photon beam incident on beryllium at an average center of mass energy of 15 GeV. A total of 100 million events was recorded. The silicon microstrip detectors were used to suppress the combinatorial background by two orders of magnitude and to extract a large clean charm sample. From a full reconstruction of 32 million events 969 $D^+$'s decaying to $$K^-\pi^+\pi^+$$, and 1360 $D^0$'s into $$K^-\pi^+$$ and $$K^-\pi^+\pi^-\pi^+$$ were obtained. An analysis of 45 million events produced 99 $$D^+_s$$'s into the $$\phi^0\pi^+$$ and $$\bar{K}^{*0} K^+$$ channels. A maximum likelihood fit to the proper time distributions gave 0.435 ± 0.015 ± 0.010, 1.06 ± 0.05 ± 0.03, and 0.48$$^{+0.06}_{-0.05}$$ ± 0.02 picoseconds for the $D^0, D^+,$ and $$D^+_s$$ lifetimes, respectively. Thus, the lifetimes of the $D^0$ and the $$D^+_s$$ were measured to be equal within error, and the lifteime of then $D^+$ was confirmed to be significantly different.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1433223
- Report Number(s):
- FERMILAB-THESIS-1987-19; UCSB-HEP-87-8; 246408
- Country of Publication:
- United States
- Language:
- English
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