Decays of the light hybrid meson 1-+

Abstract

The full width of the light isovector hybrid meson HV with spin-parities 1-+ and content (ugu - dgd)= 2 is evaluated by considering the decays HV -* rho+pi -/+, bi pi -/+, f1(1285)pi, f1(1420)pi, eta pi, and eta'pi. To calculate the partial widths of these channels, we use the quantum chromodynamics (QCD) three-point sum rule method which is necessary to determine strong couplings at the corresponding hybrid-meson-meson vertices. It turns out that the main contribution to the full width Gamma[HV] = (109.7 + 16.0) MeV of the hybrid meson comes from the processes HV -* rho+pi -/+ partial width of which amounts to approximate to 67 MeV. The effects of the decays HV -* b1 pi and HV -* f1 pi; f'1 pi are also sizeable: Their partial widths are equal to 13 MeV and 20 MeV, respectively. The decays to eta pi and eta'pi mesons are subdominant reactions, nevertheless they form approximate to 9% of the full width Gamma[HV]. Results obtained in this work may be interesting to unravel the tangle of predictions about HV existing in the literature, as well as useful in analyses of different resonances.