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We present the first measurement of the D*+ width using 9/fb of e+ e- datacollected near the Upsilon(4S) resonance by the CLEO II.V detector. Our methoduses advanced tracking techniques and a reconstruction method that takesadvantage of the small vertical size of the CESR beam spot to measure theenergy release distribution from the D*+ -> D0 pi+ decay. We find Gamma(D*+) =96 +- 4 (Statistical) +- 22 (Systematic) keV. We also measure the energyrelease in the decay and compute Delta m = m(D*+) - m(D0) = 145.412 +- 0.002(Statistical) +- 0.012 (Systematic) MeV/c^2

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

First measurement of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Γ</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mo>(</mml:mo><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mi>*</mml:mi><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mo>)</mml:mo></mml:math>and precision measurement of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>m</mml:mi></mml:mrow><mml:mrow><mml:mrow><mml:msup><mml:mrow><…

First measurement ofΓ(D*+)and precision measurement ofm<…