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Study of the P-wave charmonium state \chi_{cJ} in \psi(2S) decays

High Energy Physics - Experiment 2008-11-26 v2
Authors: J. Z. Bai
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Abstract

The processes ψ(2S)→γπ+π−\psi(2S)\to \gamma \pi^+ \pi^-, γK+K−\gamma K^+ K^- and γppˉ\gamma p \bar{p} have been studied using a sample of 3.7×1063.7 \times 10^6 produced ψ(2S)\psi(2S) decays. We determine the total width of the χc0\chi_{c0} to be Γχc0tot=14.3±2.0±3.0\Gamma^{tot}_{\chi_{c0}} = 14.3\pm 2.0\pm 3.0 MeV. We present the first measurement of the branching fraction B(χc0→ppˉ)=(16.3±4.4±5.4)×10−5B(\chi_{c0} \to p \bar{p}) = (16.3 \pm 4.4 \pm 5.4)\times 10^{-5}, where the first error is statistical and the second one systematic. Branching fractions of χc0,2→π+π−\chi_{c0,2} \to \pi^+ \pi^- and K+K−K^+ K^- are also reported.

Keywords

P-wave charmonium χ_{cJ} ψ(2S) decays branching fraction proton-antiproton

Cite

@article{arxiv.hep-ex/9807001,
  title  = {Study of the P-wave charmonium state \chi_{cJ} in \psi(2S) decays},
  author = {J. Z. Bai},
  journal= {arXiv preprint arXiv:hep-ex/9807001},
  year   = {2008}
}

Comments

10 pages, revtex, 3 figures, 2 tables

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