First Observation of a New Narrow D_sJ Meson at 2632MeV/c^2

Details First Observation of a New Narrow D_sJ Meson at 2632MeV/c^2 First Observation of a New Narrow D_sJ Meson at 2632MeV/c^2

2004-11-02

arxiv.org/abs/hep-ex/0411018v1

ECONF C0406271:MONT01,2004; Nucl.Phys.Proc.Suppl.142:467-495,2005

Physics

High Energy Physics

High Energy Physics - Experiment

2 pages, 2 figures, to be published in the proceedings of "XXIV Physics in Collision", Boston, June 2004

Scientific paper

10.1016/S0920-5632(05)00163-5

We report the first observation of a charm-strange meson D_sJ(2632) at a mass of 2632.5+/-1.7 MeV/c^2 in data from SELEX, the charm hadro-production experiment E781 at Fermilab. This state is seen in two decay modes, D_s eta and D^0 K^+. In the D_s eta decay mode we observe a peak with 101 events over a combinatoric background of 54.9 events at a mass of 2635.4+/-3.3 MeV/c^2. There is a corresponding peak of 21 events over a background of 6.9 at 2631.5+/-2.0 MeV/c^2 in the decay mode D^0 K^+. The relative branching ratio Gamma(D^0 K^+)/\Gamma(D_s eta) is 0.14+/-0.06. The full version of this paper has been accepted for publication in PRL (hep-ex/0406045). Here I have reproduced only the mass difference signal plots for the D_s eta and D^0 K^+ decay modes.

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