20-27 July 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

Pion elastic and pi-gamma form factors at large momentum transfers

22 Jul 2011, 10:00
Bayard (Alpes Congrès - Alpexpo)


Alpes Congrès - Alpexpo

Parallel session talk QCD QCD


Dr Dmitri Melikhov (HEPHY, Vienna, Austria & SINP, Moscow, Russia)


We study the pion elastic and the pi-gamma transition form factors at large values of the momentum transfers making use of the existing experimental data and two theoretical approaches: (i) the local-duality QCD sum rules and (ii) quantum-mechanical potential models with an interaction consisting of Coulomb and confining parts in which case the ground-state form factors satisfy factorization theorems similar to those in QCD. For the pion elastic form factor, we show that the existing data at Q²=1-6 GeV² lead to important consequences for the behaviour of the form factor at larger momentum transfers, up to asymptotically large values. For the pi-gamma from factor, we discuss possible dynamical mechanisms which could explain mysterious BaBar data for this form factor at Q²=10-30 GeV².

Primary authors

Dr Dmitri Melikhov (HEPHY, Vienna, Austria & SINP, Moscow, Russia) Ms Irina Balakireva (SINP, Moscow, Russia) Dr Wolfgang Lucha (HEPHY, Vienna, Austria)

Presentation Materials