Transverse-Momentum Dependent Factorization for gamma^* pi^0 to gamma

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dc.creatorMa, J. P.
dc.creatorWang, Q.
dc.date2006-07-21
dc.date2007-02-06
dc.date.accessioned2026-07-07T11:05:17Z
dc.date.available2026-07-07T11:05:17Z
dc.descriptionWith a consistent definition of transverse-momentum dependent (TMD) light-cone wave function, we show that the amplitude for the process $γ^* π^0 \toγ$ can be factorized when the virtuality of the initial photon is large. In contrast to the collinear factorization in which the amplitude is factorized as a convolution of the standard light-cone wave function and a hard part, the TMD factorization yields a convolution of a TMD light-cone wave function, a soft factor and a hard part. We explicitly show that the TMD factorization holds at one loop level. It is expected that the factorization holds beyond one-loop level because the cancelation of soft divergences is on a diagram-by-diagram basis. We also show that the TMD factorization helps to resum large logarithms of type $\ln^2x$.
dc.descriptionPublished version in Phys.Rev.D75:014014,2007
dc.identifierhttps://arxiv.org/abs/hep-ph/0607234
dc.identifierhttp://arxiv.org/abs/hep-ph/0607234
dc.identifierPhys.Rev.D75:014014,2007
dc.identifierdoi:10.1103/PhysRevD.75.014014
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/189158
dc.subjectHigh Energy Physics - Phenomenology
dc.titleTransverse-Momentum Dependent Factorization for gamma^* pi^0 to gamma
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