5 Form Factor Fit for e + e − → π + π − π + π −
نویسندگان
چکیده
The cross section of e + e − → π + π − π + π − has been measured for center-of-mass energy from 0.6 GeV to 4.5 GeV by BABAR collaboration. We apply these experimental data to fit the theoretical cross section derived from the VMD(Vector Meson Dominance) model. At the same time, the relevant parameters have been deduced from the fitting, and the isovector form factor has also been obtained.
منابع مشابه
Theoretical study of the effects of substituent and quadrupole moment on π-π stacking interactions with coronene
Stability of the π-π stacking interactions in the Ben||substituted-coronene and HFBen||substituted-coronene complexes was studied using the computational quantum chemistry methods (where Ben and HFBen are benzene and hexaflourobenzene, || denotes π-π stacking interaction, substituted-coronene is coronene molecule which substituted with four X groups, and X= NH2, CH3, OH, H, F, CF3, CN and NO). ...
متن کاملEffects of Structure and Partially Localization of the π Electron Clouds of Single-Walled Carbon Nanotubes on the Cation-π Interactions
A C102H30 graphene sheet has been rolled up to construct Single-Walled Carbon NanoTube Fragments (SWCNTFs) as parts of armchair carbon nanotubes by computational quantum chemistry methods. Non-covalent cation-π interactions of the Na+ cation on the central rings of SWCNTFs have investigated. The binding energies of the Na+-SWCNTF complexes versus ...
متن کاملA Global Treatment Of VMD Physics Up To The φ : I . e + e − Annihilations , Anomalies And Vector Meson Partial Widths
The HLS Model, equipped with a mechanism providing the breaking of U(3)/SU(3) symmetry and an isospin symmetry breaking leading naturally to vector meson mixing, has been recently shown to successfully account for e + e − → π + π − cross section and for the dipion spectrum in τ decay. The present study shows that the full anomalous sector of the HLS model can be considered and is validated by t...
متن کاملThe Effect of Hydrogen Bonding and π–π Stacking to Stabilization of 3D Networks of a New Proton Compound, (a-6-mpyH)(Hpyzd) H2O
A new proton transfer compound, formulated as (Hamp-6-pic)(Hpyzd) ∙H2O (1), has been synthesized from the reaction of pyrazine-2,3-dicarboxylic acid (H2pyzd) and 2-amino-6-methyl pyridine (amp-6-pic), in 1:1 molar ratio. Extensive O−H×××O, N−H×××N and O−H×××O hydrogen bonds involving (Hamp-6-pic)+ cation, (Hpyzd)- anion and co-crystal water molecule٫ static electronic٫ and π…π stacking interac...
متن کاملEffects of structure and number of Heteroatom on the π-π stacking interactions of benzene with N-substituted coronenes: A theoretical study
Stability of the π-π stacking interactions in the Ben||N-substituted-coronene complexes was studied using the computational quantum chemistry methods (where Ben is benzene and || denotes π-π stacking interaction, and N-substituted-coronene is coronene molecule which substituted with different number of N atoms). The results reveal simultaneous effects of structure and number of Heteroatom on th...
متن کامل