Observation of the χc2(2P) meson in the reaction γγDD¯ at BABAR

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. D 81, 092003 – Published 19 May 2010

Abstract

A search for the Z(3930) resonance in γγ production of the DD¯ system has been performed using a data sample corresponding to an integrated luminosity of 384fb1 recorded by the BABAR experiment at the PEP-II asymmetric-energy electron-positron collider. The DD¯ 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)DD¯) is found to be (0.24±0.05±0.04)keV.

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  • Received 2 February 2010

DOI:https://doi.org/10.1103/PhysRevD.81.092003

©2010 American Physical Society

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Vol. 81, Iss. 9 — 1 May 2010

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