Title

First measurement of Γ(D*+)

Document Type

Article

Publication Date

12-17-2001

Abstract

We present the first measurement of the D* width using 9/fb of e e data collected near the γ(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 Cornell Electron-positron Storage Ring beam spot to measure the energy release distribution from the D* → D π decay. We find Γ(D* ) = 96 ±4(stat) ± 22(syst)keV. We also measure the energy release in the decay and compute Δm = m − m = 145.412 ± 0.002(stat) ± 0.012(syst)MeV/c . © 2001 The American Physical Society. + + − + 0 + + + 0 2 D* D

Publication Name

Physical Review Letters

Volume Number

87

First Page

251801

Last Page

1

Issue Number

25

DOI

10.1103/PhysRevLett.87.251801

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