Observation of the χc2(2P) meson in the reaction γγ→ DD̄ at BABAR

BABAR Collaboration

研究成果: Article査読

81 被引用数 (Scopus)

抄録

A search for the Z(3930) resonance in γγ production of the DD̄ system has been performed using a data sample corresponding to an integrated luminosity of 384fb-1 recorded by the BABAR experiment at the PEP-II asymmetric-energy electron-positron collider. The DD̄ invariant mass distribution shows clear evidence of the Z(3930) state with a significance of 5.8σ. We determine mass and width values of (3926.7±2. 7±1.1)MeV/c2 and (21.3±6.8±3.6)MeV, respectively. A decay angular analysis provides evidence that the Z(3930) is a tensor state with positive parity and C parity (JPC=2++); therefore we identify the Z(3930) state as the χc2(2P) meson. The value of the partial width Γγγ×B(Z(3930)→DD̄) is found to be (0.24±0.05±0.04)keV.

本文言語English
論文番号092003
ジャーナルPhysical Review D - Particles, Fields, Gravitation and Cosmology
81
9
DOI
出版ステータスPublished - 2010 5 19
外部発表はい

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学
  • 物理学および天文学(その他)

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