A search for the Z(3930) resonance in γγ production of the DD⎯⎯⎯ 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⎯⎯⎯ 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⎯⎯⎯) is found to be (0.24±0.05±0.04)  keV.

Aubert, B., Karyotakis, Y., Lees, J.p., Poireau, V., Prencipe, E., Prudent, X., et al. (2010). Observation of the chi(c2)(2P) meson in the reaction gamma gamma -> D(D)over-bar at BABAR. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 81(9), 1-16 [10.1103/PhysRevD.81.092003].

Observation of the chi(c2)(2P) meson in the reaction gamma gamma -> D(D)over-bar at BABAR

PATRIGNANI, CLAUDIA;
2010

Abstract

A search for the Z(3930) resonance in γγ production of the DD⎯⎯⎯ 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⎯⎯⎯ 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⎯⎯⎯) is found to be (0.24±0.05±0.04)  keV.
2010
Aubert, B., Karyotakis, Y., Lees, J.p., Poireau, V., Prencipe, E., Prudent, X., et al. (2010). Observation of the chi(c2)(2P) meson in the reaction gamma gamma -> D(D)over-bar at BABAR. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 81(9), 1-16 [10.1103/PhysRevD.81.092003].
Aubert, B; Karyotakis, Y; Lees, Jp; Poireau, V; Prencipe, E; Prudent, X; Tisserand, V; Tico, Jg; Grauges, E; Martinelli, M; Palano, A; Pappagallo, M; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/537449
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