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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
Terms of use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
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
2010-05
URI
http://hdl.handle.net/1721.1/58598
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
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

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