Measurement of the charged pion electromagnetic form factor.
نویسندگان
چکیده
Separated longitudinal and transverse structure functions for the reaction 1H(e,e(')pi(+))n were measured in the momentum transfer region Q2 = 0.6--1.6 (GeV/c)(2) at a value of the invariant mass W = 1.95 GeV. New values for the pion charge form factor were extracted from the longitudinal cross section by using a recently developed Regge model. The results indicate that the pion form factor in this region is larger than previously assumed and is consistent with a monopole parametrization fitted to very low Q2 elastic data.
منابع مشابه
Virtual photons in the pion form factors and the energy–momentum tensor
We evaluate the vector and scalar form factor of the pion in the presence of virtual photons at next–to–leading order in two–flavor chiral perturbation theory. We also consider the scalar and tensor pion form factors of the energy–momentum tensor. We find that the intrinsic electromagnetic corrections are very small for the vector and charged pion scalar form factor. The scalar radius of the ne...
متن کاملMesonic Form Factors
The pion electromagnetic form factor is often considered a good observable for studying the relative accuracy of perturbative and nonperturbative descriptions of QCD as the energy scale varies. It is hoped that because the pion is the lightest and simplest hadron that perturbative descriptions will remain accurate at lower energy scales than predictions for heavier and more complicated hadrons,...
متن کاملElectromagnetic Form Factors of Charged and Neutral Kaons
The charged and neutral kaon form factors are calculated as a phenomenological application of the QCD Dyson-Schwinger equations. The results are compared with the pion form factor calculated in the same framework and yield FK±(Q 2) > Fπ±(Q 2) on Q2 ∈ [0, 3] GeV2; and a neutral kaon form factor that is similar in form and magnitude to the neutron charge form factor. These results are sensitive t...
متن کاملar X iv : h ep - l at / 0 41 10 28 v 1 2 0 N ov 2 00 4 Lattice Computations of the Pion Form Factor
The pion electromagnetic form factor is often considered a good observable for studying the onset, with increasing energy, of the perturbative QCD regime for exclusive processes. It is believed that, because the pion is the lightest and simplest hadron, a perturbative description will be valid at lower energy scales than predictions for heavier and more complicated hadrons such as the nucleon [...
متن کاملar X iv : h ep - p h / 02 11 27 5 v 1 1 8 N ov 2 00 2 Meson Form Factors and the Quark - Level Linear σ Model
The quark-level linear σ model (LσM) is employed to compute a variety of electromagnetic and weak observables of light mesons, including pion and kaon form factors and charge radii, charged-pion polarizabilities, semileptonic weak Kl3 decay, semileptonic weak radiative pion and kaon form factors, radiative decays of vector mesons, and nonleptonic weak K2π decay. The agreement of all these predi...
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:
- Physical review letters
دوره 86 9 شماره
صفحات -
تاریخ انتشار 2001