Electromagnetic decay of vector mesons as derived from QCD sum rules

Zhu, Shi-Lin; Hwang, W. Y. P.; Yang, Ze-sen

doi:10.1016/s0370-2693(97)01524-4

Cited by 15 publications

(2 citation statements)

References 18 publications

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“…This difference just comes from the definition of coupling constant g s [58]. We use the following values for the initial and final states [46,54,64]:…”

Section: Numerical Analysismentioning

confidence: 99%

Decay properties of the1−+hybrid state

et al. 2011

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Within the framework of the QCD sum rules, we consider the three-point correlation function, work at the limit q 2 ! 0 and m ! 0, and pick out the singular term $ 1 q 2 to extract the pionic coupling constants of the 1 Àþ hybrid meson. Then, we calculate the decay widths of different modes. The decay width of the S-wave modes b 1 , f 1 increases quickly as the hybrid meson mass and decay momentum increase. But for the low mass hybrid meson around 1.6 GeV, the P-wave decay mode is very important and its width is around 180 MeV, while the widths of and 0 are strongly suppressed. We suggest the experimental search of 1 ð1600Þ through the decay chains at the Beijing Spectrometer: J=c ðc 0 Þ ! 1 þ or J=c ðc 0 Þ ! 1 þ , where the 1 state can be reconstructed through the decay modes 1 ! ! þ À 0 or 1 ! f 1 ð1285Þ 0 . It is also interesting to look for 1 using the available BELLE/ BABAR data through the process e þ e

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“…This difference just comes from the definition of coupling constant g s [58]. We use the following values for the initial and final states [46,54,64]:…”

Section: Numerical Analysismentioning

confidence: 99%

Decay properties of the1−+hybrid state

et al. 2011

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“…The transition form factors between the pseudoscalar and vector mesons are also investigated by employing rather different approaches [20][21][22][23][24][25], the resulted theoretical predictions however are self-consistent and comparable from each other. The radiative form factors of vector meson, such as the ρ meson, also draw some interests [26,27].…”

Section: Introductionmentioning

confidence: 99%

ργ*→π(ρ)transition form factors in the perturbative QCD factorization approach

et al. 2015

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In this paper, we studied the ργ * → π and ργ * → ρ transition processes and made the calculations for the ρπ transition form factor Q 4 F ρπ (Q 2 ) and the ρ meson electromagnetic form factors, F LL,LT,TT (Q 2 ) and F 1,2,3 (Q 2 ), by employing the perturbative QCD (PQCD) factorization approach. For the ργ * → π transition, we found that the contribution to form factor Q 4 F ρπ (Q) from the term proportional to the distribution amplitude combination φ T ρ (x 1 )φ P π (x 2 ) is absolutely dominant, and the PQCD predictions for both the size and the Q 2 -dependence of this form factor Q 4 F ρπ (Q 2 ) agree well with those from the extended ADS/QCD models or the light-cone QCD sum rule. For the ργ * → ρ transition and in the region of Q 2 ≥ 3 GeV 2 , further more, we found that the PQCD predictions for the magnitude and their Q 2 -dependence of the F 1 (Q 2 ) and F 2 (Q 2 ) form factors agree well with those from the QCD sum rule, while the PQCD prediction for F 3 (Q 2 ) is much larger than the one from the QCD sum rule.

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