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Space- and time-like electromagnetic pion form factors in light-cone pQCD |
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| Authors: | Jiunn-Wei Chen Hiroaki Kohyama Kazuaki Ohnishi Udit Raha Yue-Long Shen |
| Affiliation: | 1. Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei 10617, Taiwan, ROC;2. Institute of Physics, Academia Sinica, Taipei, Taiwan 115, ROC;3. Physics Division, National Center for Theoretical Sciences, Hsinchu, Taiwan 300, ROC |
| Abstract: | We present a combined analysis of the space- and time-like electromagnetic pion form factors in light-cone perturbative QCD with transverse momentum dependence and Sudakov suppression. Including the genuine non-perturbative “soft” QCD and the power suppressed twist-3 corrections to the standard twist-2 perturbative QCD result, the experimental form factor data available at moderate energies/momentum transfers can be explained reasonably well. To this end, the bulk of the existing discrepancy between the space- and time-like experimental data is ostensibly reconciled. |
| Keywords: | Perturbative QCD Electromagnetic form factor Distribution amplitude Sudakov suppression Higher twist |
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