Measurement of the ratio of the vector to pseudoscalar charm semileptonic decay rate Γ (D+ → K̄ *0μ+νμ)/Γ (D+ → K̄0μ+νμ)

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. CinquiniJ. 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

Research output: Contribution to journalArticlepeer-review


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 Γ(D+→Kπμ+ν μ)/Γ(D+→K̄0μ +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+→K̄ *0μ+νμ)/Γ(D +→K̄0μ+νμ)=0. 594±0.043±0.033 and the ratio Γ(D+→K̄ 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 +→K̄0+,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 (] we extract B(D+→K̄ 0μ+ν)=(9.27±0.69±0.59±0.61)%.

Original languageEnglish (US)
Pages (from-to)33-41
Number of pages9
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
StatePublished - Sep 23 2004

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Fingerprint Dive into the research topics of 'Measurement of the ratio of the vector to pseudoscalar charm semileptonic decay rate Γ (D<sup>+</sup> → K̄ *<sup>0</sup>μ<sup>+</sup>ν<sub>μ</sub>)/Γ (D<sup>+</sup> → K̄<sup>0</sup>μ<sup>+</sup>ν<sub>μ</sub>)'. Together they form a unique fingerprint.

Cite this