منابع مشابه
ηcγ TRANSITION FORM FACTOR
The ηcγ transition form factor is calculated in a model based on a modified hard scattering approach to exclusive reactions, in which transverse degrees of freedom are taken into account. For the ηc-meson a distribution amplitude of the Bauer-Stech-Wirbel type is used, where the two free parameters, namely the decay constant fηc and the transverse size of the wave function, are related to the F...
متن کاملMeasurement of the ! c transition form factor
J. P. Lees, V. Poireau, E. Prencipe, V. Tisserand, J. Garra Tico, E. Grauges, M. Martinelli, A. Palano, M. Pappagallo, G. Eigen, B. Stugu, L. Sun, M. Battaglia, D.N. Brown, B. Hooberman, L. T. Kerth, Yu. G. Kolomensky, G. Lynch, I. L. Osipenkov, T. Tanabe, C.M. Hawkes, N. Soni, A. T. Watson, H. Koch, T. Schroeder, D. J. Asgeirsson, C. Hearty, T. S. Mattison, J. A. McKenna, M. Barrett, A. Khan, ...
متن کاملMeasurement of the ! 0 transition form factor
B. Aubert, Y. Karyotakis, J. P. Lees, V. Poireau, E. Prencipe, X. Prudent, V. Tisserand, J. Garra Tico, E. Grauges, M. Martinelli, A. Palano, M. Pappagallo, G. Eigen, B. Stugu, L. Sun, M. Battaglia, D.N. Brown, L. T. Kerth, Yu. G. Kolomensky, G. Lynch, I. L. Osipenkov, K. Tackmann, T. Tanabe, C.M. Hawkes, N. Soni, A. T. Watson, H. Koch, T. Schroeder, D. J. Asgeirsson, B.G. Fulsom, C. Hearty, T....
متن کاملThe Form Factor of the Transition Γγ * Π 0
A simple method is used to extrapolate the form factor for the process γ∗γ∗ → π when two virtual photons produce a π from the region of large spacelike photon virtualities to the experimentally accessible case when one of the photons is real. The method is also applied to the study of the axial anomaly and ω − ρ − π coupling and to the pion charge and charge radius. The results compare favourab...
متن کاملThe Photon-pion Transition Form Factor for Virtual Photons
We discuss the photon to meson transition form factor for virtual photons, which can be measured in ee collisions. We demonstrate that this form factor is independent of the shape of the meson distribution amplitude over a wide kinematical range. This leads to a parameter-free prediction of perturbative QCD to leading twist accuracy, which has a status comparable to the famous leading-twist pre...
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ژورنال
عنوان ژورنال: Few-Body Systems
سال: 2011
ISSN: 0177-7963,1432-5411
DOI: 10.1007/s00601-011-0257-2