Measurement of the form-factor ratios for Ds+ → φℓ+ 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, S. M. Yang, D. Yi, S. Yoshida, R. Zaliznyak, C. Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


We have measured the form factor ratios rV = V(0)/A1(0) and r2 = A2(0)/A1(0) for the decay Ds+ → φℓ+ ν, φ → K+ K-, using data from charm hadroproduction experiment E791 at Fermilab. Results are based on 144 signal and 22 background events in the electron channel and 127 signal and 34 background events in the muon channel. We combine the measurements from both lepton channels to obtain rV = 2.27 ± 0.35 ± 0.22 and r2 = 1.57 ± 0.25 ± 0.19.

Original languageEnglish
Pages (from-to)294-300
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-3
StatePublished - 1999


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


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