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Observation of the χc2(2P) meson in the reaction γγ→DD[bar] at BABAR

A search for the Z(3930) resonance in γγ production of the DD[bar] system has been performed using a data sample corresponding to an integrated luminosity of 384 fb−1 recorded by the BABAR experiment at the PEP-II asymmetric-energy electron-positron collider. The DD[bar] invariant mass distribution...

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Bibliographic Details
Main Authors: Aubert, Bernard (Author) , Marks, Jörg (Author) , Schenk, Sebastian (Author) , Uwer, Ulrich (Author)
Corporate Author: BABAR Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 19 May 2010
In: Physical review. D, Particles, fields, gravitation, and cosmology
Year: 2010, Volume: 81, Issue: 9, Pages: 1-16
ISSN:1550-2368
DOI:10.1103/PhysRevD.81.092003
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevD.81.092003
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.81.092003
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Author Notes:BABAR Collaboration*

MARC

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520 |a A search for the Z(3930) resonance in γγ production of the DD[bar] system has been performed using a data sample corresponding to an integrated luminosity of 384 fb−1 recorded by the BABAR experiment at the PEP-II asymmetric-energy electron-positron collider. The DD[bar] 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[bar]) is found to be (0.24±0.05±0.04) keV. 
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