First Measurement of $Γ(D^{*+})$

Details First Measurement of $Γ(D^{*+})$ First Measurement of $Γ(D^{*+})$

2001-02-05

arxiv.org/abs/hep-ex/0102007v1

Physics

High Energy Physics

High Energy Physics - Experiment

24 pages postscript, also available through http://w4.lns.cornell.edu/public/CONF, Submitted to the Fourth International Con

Scientific paper

We have made the first measurement of the D*+ width using 9/fb of e+e- data collected near the Upsilon(4S) resonance by the CLEO II.V detector. Our method uses advanced tracking techniques and a reconstruction method that takes advantage of the small vertical size of the CESR beam spot to measure the energy release distribution from the D*+ -> D0 pi+ decay. Our preliminary result is Gamma(D*+) = 96 +- 4 (Statistical) +- 22 (Systematic) keV.

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