| dc.contributor | 應物所 | |
| dc.creator (作者) | 李湘楠 | |
| dc.creator (作者) | Li, Hsiang-nan | |
| dc.creator (作者) | Mishima, Satoshi | |
| dc.date (日期) | 2009 | |
| dc.date.accessioned | 21-Nov-2018 16:18:11 (UTC+8) | - |
| dc.date.available | 21-Nov-2018 16:18:11 (UTC+8) | - |
| dc.date.issued (上傳時間) | 21-Nov-2018 16:18:11 (UTC+8) | - |
| dc.identifier.uri (URI) | http://nccur.lib.nccu.edu.tw/handle/140.119/120970 | - |
| dc.description.abstract (摘要) | It has been pointed out that the recent BaBar data on the pi gamma^* -> gamma transition form factor F_{pi gamma}(Q^2) at low (high) momentum transfer squared Q^2 indicate an asymptotic (flat) pion distribution amplitude. These seemingly contradictory observations can be reconciled in the k_T factorization theorem: the increase of the measured Q^2F_{pi gamma}(Q^2) for Q^2 > 10 GeV^2 is explained by convoluting a k_T dependent hard kernel with a flat pion distribution amplitude, k_T being a parton transverse momentum. The low Q^2 data are accommodated by including the resummation of alpha_s ln^2x, x being a parton momentum fraction, which provides a stronger suppression at the endpoints of x. The next-to-leading-order correction to the pion transition form factor is found to be less than 20% in the considered range of Q^2. | en_US |
| dc.format.extent | 186477 bytes | - |
| dc.format.mimetype | application/pdf | - |
| dc.relation (關聯) | Physical Review D, Vol.80, No.7, pp.074024 | |
| dc.title (題名) | Pion transition form factor in $k_T$ factorization | en_US |
| dc.type (資料類型) | article | |
| dc.identifier.doi (DOI) | 10.1103/PhysRevD.80.074024 | |
| dc.doi.uri (DOI) | http://dx.doi.org/10.1103/PhysRevD.80.074024 | |
