Dalitz plot analysis of the decay D(+)-->K(-)pi(+)pi(+) and indication of a low-mass scalar Kpi resonance

Dalitz plot analysis of the decay D(+)-->K(-)pi(+)pi(+) and indication of a low-mass scalar Kpi resonance

We study the Dalitz plot of the decay D(+)-->K(-)pi(+)pi(+) with a sample of 15090 events from Fermilab experiment E791. Modeling the decay amplitude as the coherent sum of known Kpi resonances and a uniform nonresonant term, we do not obtain an acceptable fit. If we allow the mass and width of t...

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Veröffentlicht in:Physical review letters 2002-09, Vol.89 (12), p.121801-121801
Hauptverfasser: Aitala, E M, Amato, S, Anjos, J C, Appel, J A, Ashery, D, Banerjee, S, Bediaga, I, Blaylock, G, Bracker, S B, Burchat, P R, Burnstein, R A, Carter, T, Carvalho, H S, Copty, N K, Cremaldi, L M, Darling, C, Denisenko, K, Devmal, S, Fernandez, A, Fox, G F, Gagnon, P, Göbel, C, Gounder, K, Halling, A M, Herrera, G, Hurvits, G, James, C, Kasper, P A, Kwan, S, Langs, D C, Leslie, J, Lundberg, B, Magnin, J, Massafferri, A, MayTal-Beck, S, Meadows, B, de Mello Neto, J R T, Mihalcea, D, Milburn, R H, de Miranda, J M, Napier, A, Nguyen, A, d'Oliveira, A B, O'Shaughnessy, K, Peng, K C, Perera, L P, Purohit, M V, Quinn, B, Radeztsky, S, Rafatian, A, Reay, N W, Reidy, J J, dos Reis, A C, Rubin, H A, Sanders, D A, Santha, A K S, Santoro, A F S, Schwartz, A J, Sheaff, M, Sidwell, R A, Slaughter, A J, Sokoloff, M D, Solano Salinas, C J, Stanton, N R, Stefanski, R J, Stenson, K, Summers, D J, Takach, S, Thorne, K, Tripathi, A K, Watanabe, S, Weiss-Babai, R, Wiener, J, Witchey, N, Wolin, E, Yang, S M, Yi, D, Yoshida, S, Zaliznyak, R, Zhang, C
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Sprache:eng
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Zusammenfassung:We study the Dalitz plot of the decay D(+)-->K(-)pi(+)pi(+) with a sample of 15090 events from Fermilab experiment E791. Modeling the decay amplitude as the coherent sum of known Kpi resonances and a uniform nonresonant term, we do not obtain an acceptable fit. If we allow the mass and width of the K(*)(0)(1430) to float, we obtain values consistent with those from PDG but the chi(2) 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 797+/-19+/-43 MeV/c(2) and width 410+/-43+/-87 MeV/c(2). The mass and width of the K(*)(0)(1430) become 1459+/-7+/-5 MeV/c(2) and 175+/-12+/-12 MeV/c(2), respectively. Our results provide new information on the scalar sector in hadron spectroscopy.
ISSN:0031-9007