Observation of the chi _{c2}(2P) meson in the reaction gamma gamma -->DD[over -bar] at BABAR
Author(s)
Dujmic, Denis; Henderson, Shawn Wesley; Sciolla, Gabriella; Yamamoto, R. K.; Zhao, M.; Cowan, Ray F; Fisher, Peter H; Spitznagel, Michael A; ... Show more Show less
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Alternative title
Observation of the χc2(2P) meson in the reaction γγ→DD̅ at BABAR
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Show full item recordAbstract
A search for the Z(3930) resonance in γγ production of the DD̅ system has been performed using a data sample corresponding to an integrated luminosity of 384 fb[superscript -1] recorded by the BABAR experiment at the PEP-II asymmetric-energy electron-positron collider. The DD̅ 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/c[superscript 2] 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 (J[superscript PC]=2[superscript ++]); therefore we identify the Z(3930) state as the χ[subscript c2](2P) meson. The value of the partial width Γ[subscript γγ]×B(Z(3930)→DD̅ ) is found to be (0.24±0.05±0.04) keV.
Date issued
2010-05Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical Review D
Publisher
American Physical Society
Citation
BABAR Collaboration et al. “Observation of the chi _{c2}(2P) meson in the reaction gamma gamma -->DD[over -bar] at BABAR.” Physical Review D 81.9 (2010): 092003. © 2010 The American Physical Society
Version: Final published version
ISSN
1550-7998
1550-2368