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Title: | Observation of the χc2(2P) meson in the reaction γγ→D¯¯¯D at BABAR |
Author: | Garra Ticó, Jordi Graugés Pous, Eugeni BABAR Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 19-May-2010 |
Publisher: | American Physical Society |
Abstract: | A search for the Z ( 3930 ) resonance in γ γ production of the D ¯¯¯ D 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 D ¯¯¯ D invariant mass distribution shows clear evidence of the Z ( 3930 ) state with a significance of 5.8 σ . We determine mass and width values of ( 3926.7 ± 2.7 ± 1.1 ) MeV / c 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 P C = 2 ++ ); therefore we identify the Z ( 3930 ) state as the χ c 2 ( 2 P ) meson. The value of the partial width Γ γ γ × B ( Z ( 3930 ) → D ¯¯¯ D ) is found to be ( 0.24 ± 0.05 ± 0.04 ) keV . |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.81.092003 |
It is part of: | Physical Review D, 2010, vol. 81, num. 9, p. 092003 |
URI: | http://hdl.handle.net/2445/131725 |
Related resource: | https://doi.org/10.1103/PhysRevD.81.092003 |
ISSN: | 1550-7998 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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