Single-Spin Polarization Effects and the Determination of Timelike Proton Form Factors

Abstract

We show that measurements of the proton's polarization in electron-positron annihilation to a proton-antiproton pair $e^{+}{e}^{-}\to p\bar{p}$ strongly discriminate between the analytic forms of models which fit the proton form factors in the spacelike region. In particular, the single-spin asymmetry normal to the scattering plane measures the relative phase difference between the timelike $G_E$ and $G_M$ form factors. The expected proton polarization in the timelike region is large, of order of several tens of percent.

LaTex, 12 pages, 4 figures

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Cited by in corpus (39)

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• Nucleon Electromagnetic Form Factors in the Timelike Region
• Periodic interference structures in the time-like proton form factor
• The covariant structure of light-front wave functions and the behavior of hadronic form factors
• Nucleon electromagnetic form factors and polarization observables in space-like and time-like regions
• Spin asymmetries and correlations in lambda-pair production through the radiative return method
• General analysis of polarization phenomena in $e^{+}+e^{-}\to N+\bar{N}$ for axial parametrization of two--photon exchange
• The electromagnetic form factors of $\Lambda$ hyperon in the vector meson dominance model
• Charmful Three-body Baryonic B decays
• Polarization effects in the reaction $\bar{p}+p\to e^{+}+e^{-}$ in presence of two-photon exchange
• No Sommerfeld resummation factor in e+e- -> ppbar ?
• A description of the ratio between electric and magnetic proton form factors by using space-like, time-like data and dispersion relations
• Prospects for e+e- physics at Frascati between the phi and the psi
• Four-body baryonic decays of $B\to p\bar{p}{\pi }^{+}{\pi }^{-}({\pi }^{+}{K}^{-})$ and $\Lambda \bar{p}{\pi }^{+}{\pi }^{-}(K^{+}{K}^{-})$
• Study of $B\to p\bar{p}{K}^{\ast }$ and $B\to p\bar{p}\rho$
• Direct CP violation in internal W-emission dominated baryonic B decays
• New Results in Light-Front Phenomenology
• Production and decay of hyperons in a transversely polarized electron-positron collider
• Three-body charmless baryonic ${\bar{B}}_s^0$ decays
• Asymptotic behavior of nucleon electromagnetic form factors in time-like region
• Baryonic $B$ meson decays
• Determination of Nucleon Form factors from Baryonic B Decays
• Factorization and angular distribution asymmetries in charmful baryonic B decays
• Radiative Corrections to the Azimuthal Asymmetry in Transversely Polarized Moller Scattering
• High Energy Photon-Photon Collisions at a Linear Collider
• Study of $\bar{B}\to \Lambda \bar{p}\rho (\varphi )$ and $\bar{B}\to \Lambda \bar{\Lambda }{\bar{K}}^{\ast }$
• Charmful baryonic B\to {\bf B\bar B'}M_c decays
• Polarisation observables in lepton antilepton to proton antiproton reactions including lepton mass
• The electromagnetic form factors of ${\Lambda }_c$ hyperon in the vector meson dominance model
• Study of Two-Photon Corrections in the $p\bar{p}-->e+e-$ Process: Hard Rescattering Mechanism
• Extraction of proton form factors in the timelike region from unpolarized e+e- --> p pbar events
• Study of $B^{-}\to \Lambda \bar{p}{\eta }^{{(}^{\prime })}$ and ${\bar{B}}_s^0\to \Lambda \bar{\Lambda }{\eta }^{{(}^{\prime })}$ decays
• The electromagnetic form factors of $\Lambda$ hyperon in $e^{+}{e}^{-}\to \bar{\Lambda }\Lambda$
• Extraction of proton form factors in the timelike region from single-polarized e+ e- -> \vec p anti-p events
• Angular asymmetries in $B\to \Lambda \bar{p}M$ decays
• Exploring the simplest purely baryonic decay processes
• Flavor content of nucleon form factors in the space- and time-like region
• A theoretical study of spin filtering and its application to polarizing antiprotons