9 v 1 2 1 A ug 2 00 3 1 “ Point - form ” estimate of the pion form factor revisited
نویسندگان
چکیده
The pion form factor calculation in the " point-form " of relativistic quantum mechanics is reconsidered. Particular attention is given to the relation between the momentum of the system and the momentum transfer as well as to the quark current.
منابع مشابه
ar X iv : h ep - p h / 06 08 27 3 v 1 2 4 A ug 2 00 6 1 Electromagnetic fields and transport coefficients in a hot pion gas
We present recent results on finite temperature electromagnetic form factors and the electrical conductivity in a pion gas. The standard Chiral Perturbation Theory power counting needs to be modified for transport coefficients. We pay special attention to unitarity and to possible applications for dilepton and photon production.
متن کاملar X iv : h ep - p h / 03 08 01 0 v 1 1 A ug 2 00 3 1 Pion absorption and rescattering in the ANP model revisited
Single pion leptoproduction in the region of the (3, 3) resonance is currently of high interest for at least two reasons: (i) These reactions constitute an important part of the total cross section in low energy reactions and are utilized to detect neutrino oscillations in current and future long baseline experiments. (ii) Intranuclear rescattering of the pions in heavy nuclei results in intere...
متن کاملar X iv : h ep - l at / 0 60 80 21 v 1 2 8 A ug 2 00 6 The pion form factor from lattice QCD with two dynamical flavours
We compute the electromagnetic form factor of the pion using non-perturbatively O(a) improved Wilson fermions. The calculations are done for pion masses down to 400 MeV and for lattice spacings of 0.07 – 0.11 fm. We check for finite size effects by repeating some of the measurements on smaller lattices. The large number of lattice parameters we use allows us to extrapolate to the physical point...
متن کاملar X iv : n uc l - th / 0 30 80 39 v 1 1 4 A ug 2 00 3 DSEs , THE PION , AND RELATED MATTERS
The vast body of pion data available provides compelling evidence that this composite particle is a Goldstone mode of the strong interaction associated with the dynamical breaking of chiral symmetry. Therefore a legitimate understanding of pion observables, including its mass, decay constants and form factors, requires that an approach possess a well-defined and valid chiral limit. This is impo...
متن کاملX iv : h ep - p h / 07 02 01 5 v 1 1 F eb 2 00 7 Pion form factor at very large Q 2
The pion form factor at very large Q2 is obtained by using a new pion wave function. It shows that when Q2 >> (1.8GeV )2 the pion form factor reaches the asymptotic limit αs(Q) Q .
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2003