Article

# Search for CP violation in the decays D+--> K(S)pi+ and D+-->K(S)K+.

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University of California, Davis, California 95616, USA.
(Impact Factor: 7.51). 01/2002; 88(4):041602. DOI: 10.1103/PhysRevLett.88.041602
Source: PubMed

ABSTRACT

A high-statistics sample of photoproduced charm from the FOCUS experiment has been used to search for direct CP violation in the decay rates for D+-->K(S)pi+ and D+-->K(S)K+. We have measured the following asymmetry parameters relative to D+-->K-pi+pi+: A(CP)(K(S)pi+) = (-1.6+/-1.5+/-0.9)%, A(CP)(K(S)K+) = (+6.9+/-6.0+/-1.5)%, and A(CP)(K(S)K+) = (+7.1+/-6.1+/-1.2)% relative to D+-->K(S)pi+. We have also measured the relative branching ratios and found Gamma(D+-->K(0)pi+)/Gamma(D+-->K-pi+pi+) = (30.60+/-0.46+/-0.32)%, Gamma(D+-->K(0)K+)/Gamma(D+-->K-pi+pi+) = (6.04+/-0.35+/-0.30)%, and Gamma(D+-->K(0)K+)/Gamma(D+-->K(0)pi+) = (19.96+/-1.19+/-0.96)%.

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Available from: Marco A. Reyes, Aug 21, 2014
• ##### Article: Search for CP violation in the decays D+-> K-S pi(+) and D+-> KSK+ (vol 88, art no 041602, 2002)

No preview · Article · Apr 2002 · Physical Review Letters
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##### Article: Study of the Cabibbo-suppressed decay modes D0→π−π+ and D0→K−K+
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ABSTRACT: Using data from the FOCUS (E831) experiment at Fermilab, we present a new measurement for the branching ratios of the Cabibbo-suppressed decay modes D0→π−π+ and D0→K−K+. We measured: Γ(D0→K−K+)/Γ(D0→π−π+)=2.81±0.10(stat)±0.06(syst), Γ(D0→K−K+)/Γ(D0→K−π+)=0.0993±0.0014(stat)±0.0014(syst), and Γ(D0→π−π+)/Γ(D0→K−π+)=0.0353±0.0012(stat)±0.0006(syst). These values have been combined with other experimental data to extract the ratios of isospin amplitudes and the phase shifts for the D→KK and D→ππ decay channels.
Full-text · Article · Jan 2003 · Physics Letters B
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##### Article: Measurement of the ratio of the vector to pseudoscalar charm semileptonic decay rate Γ (D+ → K̄ *0μ+νμ)/Γ (D+ → K̄0μ+νμ)
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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 . Allowing for the Kπ S-wave interference measured in [J.M. Link, et al., FOCUS Collaboration, Phys. Lett. B 544 (2002) 89], we extract the vector to pseudoscalar ratio and the ratio . Our results show a lower ratio for Γ(D→K*ℓν)/Γ(D→Kℓν) than has been reported recently and indicate the current world average branching fractions for the decays are low. Using the world average B(D+→K−π+π+) [K. Hagiwara, et al., Particle Data Group Collaboration, Phys. Rev. D 66 (2002) 010001, and 2003 partial update for edition 2004 (http://pdg.lbl.gov)] we extract .
Full-text · Article · Sep 2004 · Physics Letters B