Abstract
We present a study of the inclusive D*(+/-) production in the decay of Y(1S) using (98.6 +/- 0.9) X 10(6) Y(2S) mesons collected with the BABAR detector at the Y(2S) resonance. Using the decay chain Y(2S) -> pi(+)pi Y-(1S), Y(1S) -> D*X-+/-, where X is unobserved, we measure the branching fraction B[Y(1S) -> D*X-+/-] = (2.52 +/- 0.13(stat) +/- 0.15(syst)% and the D*(+/-) momentum distribution in the rest frame of the Y(1S). We find evidence for an excess of D*+/- production over the expected rate from the virtual photon annihilation process Y(1S) -> gamma* -> c (c) over bar -> D*X-+/-.
We are grateful for the extraordinary contributions of
our PEP-II colleagues in achieving the excellent luminosity
and machine conditions that have made this work possible.
The success of this project also relies critically on
the expertise and dedication of the computing organizations
that support BABAR. The collaborating institutions wish to thank SLAC for its support and the kind hospitality
extended to them. This work is supported by the
US Department of Energy and National Science Foundation,
the Natural Sciences and Engineering Research
Council (Canada), the Commissariat à l'Energie Atomique
and Institut National de Physique Nucléaire et de
Physique des Particules (France), the Bundesministerium
für Bildung und Forschung and Deutsche Forschungsgemeinschaft
(Germany), the Istituto Nazionale di Fisica
Nucleare (Italy), the Foundation for Fundamental Research
on Matter (The Netherlands), the Research Council
of Norway, the Ministry of Education and Science of
the Russian Federation, Ministerio de Educación y Ciencia
(Spain), and the Science and Technology Facilities
Council (United Kingdom). Individuals have received
support from the Marie-Curie IEF program (European
Union) and the A. P. Sloan Foundation.
Peer reviewed