EPJ Web of Conferences
Volume 37, 2012MESON 2012 – 12th International Workshop on Production, Properties and Interaction of MESONS
|Number of page(s)||4|
|Section||Meson decays - parallel talks|
|Published online||06 December 2012|
Dalitz plot studies of D0 → KS0π+π− decays
1 Division of Theoretical Physics, The Henryk Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Kraków, Poland
2 ul. Bronowicka 85/26, 30-091 Kraków, Poland
3 Laboratoire de Physique Nucléaire et de Hautes Énergies, Groupe Théorie, Université Pierre et Marie Curie et Université Paris-Diderot, IN2P3 et CNRS, 4 place Jussieu, 75252 Paris, France
a e-mail: Leonard.Lesniak@ifj.edu.pl
The availaible data on the D0 → KS0π+π− decays are analysed in the framework of the quasi two-body QCD factorization approximation. The annihilation, via Wexchange, amplitudes are added to the weak-decay tree amplitudes. The doubly Cabibbo suppressed parts of the amplitudes are also considered. The strong interactions between the kaon-pion and pion-pion pairs in the S-, P- and D-final states are described in terms of the corresponding form factors. The kaon-pion or pion-pion scalar and vector form factors are constrained by other experimental data. Unitarity, analyticity and chiral symmetry are also used to obtain their functional forms. We go through a minimization procedure to reproduce the KS0π−, KS0π+ and π+ π- effective mass projections of the Dalitz plot distributions. The large number (27) of non-zero amplitudes leads to a large number of parameters. The resulting model distributions and branching fractions are compared to the accurate Belle Collaboration data.
© Owned by the authors, published by EDP Sciences, 2012
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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