Measurement of the form-factor ratios for D+ → K(black star)0+ ν

E. M. Aitala*, S. Amato, J. C. Anjos, J. A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S. B. Bracker, P. R. Burchat, R. A. Burnstein, T. Carter, H. S. Carvalho, N. K. Copty, L. M. Cremaldi, C. Darling, K. Denisenko, A. Fernandez, G. F. Fox, P. GagnonC. Gobel, K. Gounder, A. M. Halling, G. Herrera, G. Hurvits, C. James, P. A. Kasper, S. Kwan, D. C. Langs, J. Leslie, B. Lundberg, S. MayTal-Beck, B. Meadows, J. R.T. De Mello Neto, D. Mihalcea, R. H. Milburn, J. M. De Miranda, A. Napier, A. Nguyen, A. B. D'Oliveira, K. O'Shaughnessy, K. C. Peng, L. P. Perera, M. V. Purohit, B. Quinn, S. Radeztsky, A. Rafatian, N. W. Reay, J. J. Reidy, A. C. Dos Reis, H. A. Rubin, D. A. Sanders, A. K.S. Santha, A. F.S. Santoro, A. J. Schwartz, M. Sheaff, R. A. Sidwell, A. J. Slaughter, M. D. Sokoloff, J. Solano, N. R. Stanton, R. J. Stefanski, K. Stenson, D. J. Summers, S. Takach, K. Thorne, A. K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, D. Yi, S. M. Yang, S. Yoshida, R. Zaliznyak, C. Zhang

*Corresponding author for this work

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The form factor ratios rv = V(0)/A1(0), r2 = A2(0)/A1(0) and r3 = A3(0)/A1(0) in the decay D+ → K̄(black star)0+ ν, K̄(black star)0 K- π+ have been measured using data from charm hadroproduction experiment E791 at Fermilab. From 3034 (595) signal (background) events in the muon channel, we obtain rv= 1.84 ± 0.11 ± 0.09, r2 = 0.75 ± 0.08 ± 0.09 and, as a first measurement of r3, we find 0.04 ± 0.33 ± 0.29. The values of the form factor ratios rv and r2 measured for the muon channel are combined with the values of rv and r2 that we have measured in the electron channel. The combined E791 results for the muon and electron channels are rv = 1.87 ± 0.08 ± 0.07 and r2 = 0.73 ± 0.06 ± 0.08.

Original languageEnglish
Pages (from-to)435-441
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3-4
StatePublished - 19 Nov 1998


FundersFunder number
Conselho Nacional de Desenvolvimento Cientı́fico e Technológico
Israeli Academy of Sciences and Humanities
U.S. Departament of Energy
U.S.-Israel Binational Science Foundation
National Science Foundation
Consejo Nacional de Ciencia y Tecnología


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