Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dalitz plot studies of D0 --> K0S pi+ pi- decays in a factorization
  approach   The presently available high-statistics data of the D0 --> K0S pi+ pi-
processes measured by the Belle and BABAR Collaborations are analyzed within a
quasi two-body QCD factorization framework. Starting from the weak effective
Hamiltonian, tree and annihilation amplitudes build up the D0 --> K0S pi+ pi-
decay amplitude. Two of the three final-state mesons are assumed to form a
single scalar, vector or tensor state originating from a quark-antiquark pair
so that the factorization hypothesis can be applied. The meson-meson final
state interactions are described by K pi and pi pi scalar and vector form
factors for the S and P waves and by relativistic Breit-Wigner formulae for the
D waves. A combined chi^2 fit to a Belle Dalitz plot density distribution, to
the total experimental branching fraction and to the tau^- --> K0S pi- nu_tau
decay data is carried out to fix the 33 free parameters. These are mainly
related to the strengths of the scalar form factors and to unknown meson to
meson transition form factors at a large momentum transfer squared equal to the
D0 mass squared. A good overall agreement to the Belle Dalitz plot density
distribution is achieved. Another set of parameters fits equally well the BABAR
Collaboration Dalitz plot model. The branching fractions of the dominant
channels compare well with those of the isobar Belle or BABAR models.The
lower-limit values of the branching fractions of the annihilation amplitudes
are significant. Built upon experimental data from other processes, the unitary
K pi and pi pi scalar form factors, entering our decay amplitude and satisfying
analyticity and chiral symmetry constraints, are furthermore constrained by the
present Dalitz plot analysis. Our decay amplitude could be a useful input for
determinations of D0-D0bar mixing parameters and of the CKM angle gamma (or
phi3).

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The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga