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    Please use this identifier to cite or link to this item: http://nccur.lib.nccu.edu.tw/handle/140.119/120970


    Title: Pion transition form factor in $k_T$ factorization
    Authors: 李湘楠
    Li, Hsiang-nan
    Mishima, Satoshi
    Contributors: 應物所
    Date: 2009
    Issue Date: 2018-11-21 16:18:11 (UTC+8)
    Abstract: 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.
    Relation: Physical Review D, Vol.80, No.7, pp.074024
    Data Type: article
    DOI 連結: http://dx.doi.org/10.1103/PhysRevD.80.074024
    DOI: 10.1103/PhysRevD.80.074024
    Appears in Collections:[應用物理研究所 ] 期刊論文

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