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Matching lightcone- and anomaly-sum-rule predictions for the pion-photon transition form factor

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arxiv 1512.02556 v2 pith:R2Y5LW4O submitted 2015-12-08 hep-ph

Matching lightcone- and anomaly-sum-rule predictions for the pion-photon transition form factor

classification hep-ph
keywords factorformpion-photonrulestransitionapproachespredictionstypes
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The pion-photon transition form factor is studied by employing two types of Sum Rules: Light Cone Sum Rules (LCSR) and Anomaly Sum Rules (ASR). By comparing the predictions for the pion-photon transition form factor, obtained from these two approaches, the applicability limit of the LCSRs at low momenta is determined. Reciprocally, the ASR threshold dependence on the momentum was extracted using our LCSR-based method in combination with two different types of pion distribution amplitudes and found that at higher Q2 it approaches a constant.

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