Spacelike and timelike form factors for the (π0,η,η′)→

Abstract

We investigate the (π 0 , η, η ) → γ * γ transitions both for the spacelike region and the timelike region using the light-front quark model (LFQM). In particular, we present the new direct method to explore the timelike region without resorting to mere analytic continuation from the spacelike region to the timelike region. Our direct calculation in timelike region shows the complete agreement not only with the analytic continuation result from the spacelike region but also with the result from the dispersion relation between the real and imaginary parts of the form factor. For the low energy regime, we compare our LFQM results of the transition form factors (TFFs) for the low timelike momentum transfer region and the slope parameters at q 2 = 0 with the recent experimental data from the Dalitz decays of (π 0 , η, η ). For the high energy regime, we incorporate the QCD factorization in our LFQM to examine the asymptotic behavior of TFFs both for the spacelike region and the timelike region. We compare our results with the available experimental data.

Revisiting the form factors of $$P\rightarrow V$$ transition within the light-front quark models

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Distribution amplitudes of heavy mesons and quarkonia on the light front

“…The simplest hadronic distribution amplitude is that of the pion and has justifiably received much attention [6][7][8][9][10][11][12][13][14][15][16][17][18][19] due to increasing interest in, amongst others, precision calculation of two-photon transition form factor [20][21][22][23][24][25][26][27][28][29] and of weak semi-leptonic, B → π ν , and non-leptonic B → ππ, B → ρπ, B → K π . .…”

Dynamical spin effects in the pseudoscalar nonetwithin holographic QCD

“…The photon-meson transition form factor is directly related to the inverse moment of the meson's PDA. For the pion, we have [18]…”