A unitarized FSI framework with no adjustable parameters for B decays, calibrated on BaBar γγ o D Dbar data, predicts enhanced CP asymmetries in pure-annihilation channels that match existing measurements.
Observation of the chi_c2(2P) meson in the reaction gamma gamma -> D Dbar at BABAR
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abstract
A search for the Z(3930) resonance in gamma gamma production of the DDbar 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 DDbar 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)xB(Z(3930)-> DDbar) is found to be (0.24 +- 0.05 +- 0.04) keV.
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Resolving the CP Asymmetry Puzzle in $B$ Decays with Unitarized Final-State Interactions
A unitarized FSI framework with no adjustable parameters for B decays, calibrated on BaBar γγ o D Dbar data, predicts enhanced CP asymmetries in pure-annihilation channels that match existing measurements.