Journal
PHYSICAL REVIEW D
Volume 81, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.81.092003
Keywords
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Funding
- U.S. Department of Energy
- National Science Foundation
- Natural Sciences and Engineering Research Council (Canada)
- Commissariat a l'Energie Atomique and Institut National de Physique Nucleaire et de Physique des Particules (France)
- Bundesministerium fur Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany)
- Istituto Nazionale di Fisica Nucleare (Italy)
- Foundation for Fundamental Research on Matter (The Netherlands)
- Research Council of Norway
- Ministry of Education and Science of the Russian Federation
- Ministerio de Educacion y Ciencia (Spain)
- Science and Technology Facilities Council (United Kingdom)
- European Union
- A.P. Sloan Foundation
- STFC [ST/H001166/1, ST/H000992/1, ST/F008015/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H001166/1, ST/F008015/1, PP/E000444/1, ST/H000992/1] Funding Source: researchfish
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A search for the Z(3930) resonance in gamma gamma production of the D (D) over 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 D (D) over bar invariant mass distribution shows clear evidence of the Z(3930) state with a significance of 5.8 sigma. 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(PC) = 2(++)); therefore we identify the Z(3930) state as the chi(c2)(2P) meson. The value of the partial width Gamma(gamma gamma) x B(Z(3930) -> D (D) over bar) is found to be (0.24 +/- 0.05 +/- 0.04) keV.
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