Pion charge form factor and constraints from space-time translations
نویسندگان
چکیده
منابع مشابه
Form factors in relativistic quantum mechanic: constraints from space-time translations
The comparison of form factors calculated from a single-particle current in different relativistic quantum mechanic approaches evidences tremendous discrepancies. The role of constraints coming from space-time translations is considered here with this respect. It is known that invariance under these translations implies the energy-momentum conservation relation that is usually assumed to hold g...
متن کاملForm factors in RQM approaches: constraints from space-time translations, extension to constituents with spin-1/2 and unequal masses
Constraints related to transformations of currents under space-time translations have been considered for the relativistic quantum mechanics calculation of form factors of J = 0 systems composed of scalar constituents with equal masses. Accounting for these constraints amounts to take into account many-body currents that restore the equality of the momentum transferred separately to the system ...
متن کاملThe pion form factor from first principles
We calculate the electromagnetic form factor of the pion in quenched lattice QCD. The non-perturbatively improved Sheikoleslami-Wohlert lattice action is used together with the O(a) improved current. We calculate form factor for pion masses down to mπ = 360 MeV . We compare the mean square radius for the pion extracted from our form factors to the value obtained from the ’Bethe Salpeter amplitu...
متن کاملThe Pion Form Factor
The pion, and specifically its charge form factor, is of key interest in the study of the quark-gluon structure of hadrons. This is exemplified by the many calculations that treat the pion as one of their prime examples. One of the reasons is that the valence structure of the pion, being 〈qq̄〉, is relatively simple. Hence it is expected that the value of the four-momentum transfer squared Q, dow...
متن کاملPion structure from improved lattice QCD: form factor and charge radius at low masses
The charge form factor of the pion is calculated in lattice QCD. The non-perturbatively improved Sheikholeslami-Wohlert action is used together with the O(a) improved vector current. Other choices for the current are examined. The form factor is extracted for pion masses from 970 MeV down to 360 MeV and for momentum transfers Q2 ≤ 2 GeV. The mean square charge radius is extracted, compared to p...
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ژورنال
عنوان ژورنال: Chinese Physics C
سال: 2010
ISSN: 1674-1137
DOI: 10.1088/1674-1137/34/9/038