Measurement of the ratio of the vector to pseudoscalar charm semileptonic decay rate Γ(D+→K¯*0μ+νμ)/Γ(D+→K¯0μ+νμ)

• DOI: 10.1016/j.physletb.2004.07.060
• Publication Date: 2004-08-25T15:32:18Z
• Authors: J.M. Link; P.M. Yager; J.C. Anjos; I. Bediaga; C. Göbel; A.A. Machado; J. Magnin; A. Massafferri; J.M. de Miranda; I.M. Pepe; E. Polycarpo; A.C. dos Reis; S. Carrillo; E. Casimiro; E. Cuautle; A. Sánchez-Hernández; C. Uribe; F. Vázquez; L. Agostino; L. Cinquini; J.P. Cumalat; B. O'Reilly; I. Segoni; K. Stenson; J.N. Butler; H.W.K. Cheung; G. Chiodini; I. Gaines; P.H. Garbincius; L.A. Garren; E. Gottschalk; P.H. Kasper; A.E. Kreymer; R. Kutschke; M. Wang; L. Benussi; L. Bertani; S. Bianco; F.L. Fabbri; A. Zallo; M. Reyes; C. Cawlfield; D.Y. Kim; A. Rahimi; J. Wiss; R. Gardner; A. Kryemadhi; Y.S. Chung; J.S. Kang; B.R. Ko; J.W. Kwak; K.B. Lee; K. Cho; H. Park; G. Alimonti; S. Barberis; M. Boschini; A. Cerutti; P. D'Angelo; M. DiCorato; P. Dini; L. Edera; S. Erba; M. Giammarchi; P. Inzani; F. Leveraro; S. Malvezzi; D. Menasce; M. Mezzadri; L. Moroni; D. Pedrini; C. Pontoglio; F. Prelz; M. Rovere; S. Sala; T.F. Davenport; V. Arena; G. Boca; G. Bonomi; G. Gianini; G. Liguori; M.M. Merlo; D. Pantea; D. Lopes Pegna; S.P. Ratti; C. Riccardi; P. Vitulo; H. Hernandez; A.M. Lopez; H. Mendez; A. Paris; J. Quinones; J.E. Ramirez; Y. Zhang; J.R. Wilson; T. Handler; R. Mitchell; A.D. Bryant; D. Engh; M. Hosack; W.E. Johns; E. Luiggi; M. Nehring; P.D. Sheldon; E.W. Vaandering; M. Webster; M. Sheaff
• Keywords: 0103 physical sciences; 01 natural sciences; article; mathematical computing; measurement; physics; statistics

AbstractUsing 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 Γ(D+→Kπμ+νμ)/Γ(D+→K¯0μ+νμ)=0.625±0.045±0.034. 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 Γ(D+→K¯*0μ+νμ)/Γ(D+→K¯0μ+νμ)=0.594±0.043±0.033 and the ratio Γ(D+→K¯0μ+νμ)/Γ(D+→K−π+π+)=1.019±0.076±0.065. 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 D+→K¯0(μ+,e+)νμ,e 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 B(D+→K¯0μ+ν)=(9.27±0.69±0.59±0.61)%.