منابع مشابه
Charged Pion Polarizability From the Lattice
Direct evaluation of charged particle polarizabilities on the lattice is quite difficult. However, a short cut for charged pion polarizability the Das, Mathur, Okubo Sum Rule can readily be calculated using lattice techniques. A phenomenological model has been developed to fit the time behavior of the propagators in this expression. Numerical systematics are discussed and some preliminary resul...
متن کاملLattice Charge Overlap II: Aspects of Charged Pion Polarizability
Formulas are developed for use in lattice studies of charged hadron polarizabilities. In particular, the valence quark different-flavor component of the charged pion polarizability is examined on a 163 × 24 lattice at β = 6.0 using Wilson fermions. Using the elastic limit results of Part I of this series, it is concluded that this represents a small negative component of the full charged polari...
متن کاملMeasurement of the charged-pion polarizability.
The COMPASS collaboration at CERN has investigated pion Compton scattering, π(-)γ→π(-)γ, at center-of-mass energy below 3.5 pion masses. The process is embedded in the reaction π(-)Ni→π(-)γNi, which is initiated by 190 GeV pions impinging on a nickel target. The exchange of quasireal photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, Q(2)<0.0015 (G...
متن کاملPion charge radius from charged pion electroproduction
We analyze a low-energy theorem of threshold pion electroproduction which allows one to determine the charge radius of the pion. We show that at the same order where the radius appears, pion loops induce a correction to the momentum dependence of the longitudinal dipole amplitude L01 (2) . This model-independent correction amounts to an increase of the pion charge radius squared from the electr...
متن کاملMeasuring the charged pion polarizability in the γγ → π + π − reaction
Development has begun of a new experiment to measure the charged pion polarizability απ − βπ . The charged pion polarizability ranks among the most important tests of low-energy QCD presently unresolved by experiment. Analogous to precision measurements of π◦→ γγ that test the intrinsic odd-parity (anomalous) sector of QCD, the pion polarizability tests the intrinsic evenparity sector of QCD. T...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 1997
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(96)00643-3