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Measurement of the ratio of the vector to pseudoscalar charm semileptonic decay rate gamma(D+ ---> anti-K*0 mu+ nu) / gamma(D+ ---> anti-K0 mu+ nu)

Document #:
FOCUS-doc-728-v2
Document type:
Publication
Submitted by:
Jonathan A. Pellish
Updated by:
Jonathan A. Pellish
Document Created:
11 Aug 2004, 15:15
Contents Revised:
11 Aug 2004, 15:34
Metadata Revised:
23 Sep 2004, 15:25
Actually Revised:
24 Aug 2005, 15:22
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Abstract:
Using a high statistics sample of photo-produced charm particles from the FOCUS experiment at Fermilab, we report on the measurement of the ratio of semileptonic rates \Gamma(D+ > ANTI-K pi mu+ nu)/\Gamma(D+ > ANTI-K0 mu+ nu)= 0.625 +/- 0.045 +/- 0.034. Allowing for the K pi S-wave interference measured previously by FOCUS, we extract the vector to pseudoscalar ratio \Gamma(D+ > ANTI-K*0 mu+ nu)/\Gamma(D+ > ANTI-K0 mu+ nu)= 0.594 +/- 0.043 +/- 0.033 and the ratio \Gamma(D+ > ANTI-K0 mu+ nu)/\Gamma(D+ > K- pi+ pi+)= 1.019 +/- 0.076 +/- 0.065. Our results show a lower ratio for \Gamma(D > K* \ell nu})/\Gamma(D > K \ell nu) than has been reported recently and indicate the current world average branching fractions for the decays D+ >ANTI-K0(mu+, e+) nu are low. Using the PDG world average for B(D+ > K- pi+ pi+) we extract B(D+ > ANIT-K0 mu+ nu)=(9.27 +/- 0.69 +/- 0.59 +/- 0.61)%.
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Published in hep-ex/0406060.
Published in Phys. Lett. B vol. 598 pg. 33.
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