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B Decays to Hadronic States with CharmCharmonium in BaBar
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3 B DECAYS TO HADRONIC STATES WITH CHARM/CHARMONIUM IN
BABAR
G. Vuagnin
(for the BABAR Collaboration)
INFN Sezione di Trieste, Area di Ricerca, Padriciano 99,
34012 Trieste, ITALY
In this paper the studies of three different B decays to hadronic states are presented. These
results are based on 1999-2003 dataset collected by the BABAR experiment at the PEP-II
e+e? storage ring at the Stanford Linear Accelerator Center. The measurements are the
hadronic branching fraction of B+ → J/ΨpΛ?, B0 → J/Ψpp?, B0 → D?±D?, and the direct
CP -asymmetry in B0 → D0(CP )K? channels.
1 Introduction
The decay of B mesons to open charm and charmonium provides an excellent laboratory for
the study of hadronic B decays. With about 88 millions of B pairs, the BABAR experiment
has collected a sample of data that enable to test models of B decay in more modes and with
greater precision than ever before. In this note we present some examples. In section 2 a test
on non-relativistic QCD is described. In the next section a measurement of branching fraction
and measurements of time-integrated asymmetries in channels suitable for CP violation study
are presented. The BABAR detector is described in detail elsewhere 1. Charge conjugation is
implied throughout this note.
2 B Decays To Charmonium States
The inclusive production of charmonium mesons in B decay at the Υ(4S) shows an excess of J/Ψ
mesons at low center-of-mass momentum pCM
2,3,4, when compared to distributions predicted
by non-relativistic QCD calculations 5. Some hypothesis have been proposed to explain the
sources of the excess: an intrinsic 6 charm component of the B, the production of an sd?g
hybrid 7 in conjunction with a J/Ψ, or the possibility that the excess comes from decays of
the type B → J/Ψ baryon anti-baryon 8. The rate of these decays could be enhanced by the
intermediate production of an exotic state allowed by QCD but not yet observed. In this section
we p
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