Dalitz Plot Analysis of the Decay [Formula presented] and Indication of a Low-Mass Scalar [Formula presented] Resonance

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, S. Devmal, A. Fernandez, G. F. FoxP. Gagnon, C. Göbel, K. Gounder, A. M. Halling, G. Herrera, G. Hurvits, C. James, P. A. Kasper, S. Kwan, D. C. Langs, J. Leslie, B. Lundberg, J. Magnin, A. Massafferri, 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, C. J.Solano Salinas, 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

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Abstract

We study the Dalitz plot of the decay [Formula presented] with a sample of 15090 events from Fermilab experiment E791. Modeling the decay amplitude as the coherent sum of known [Formula presented] resonances and a uniform nonresonant term, we do not obtain an acceptable fit. If we allow the mass and width of the [Formula presented] to float, we obtain values consistent with those from PDG but the [Formula presented] per degree of freedom of the fit is still unsatisfactory. A good fit is found when we allow for the presence of an additional scalar resonance, with mass [Formula presented] and width [Formula presented]. The mass and width of the [Formula presented] become [Formula presented] and [Formula presented], respectively. Our results provide new information on the scalar sector in hadron spectroscopy.

Original languageEnglish
JournalPhysical Review Letters
Volume89
Issue number12
DOIs
StatePublished - 2002

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