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Study of Two-Photon Exchange via the Beam Transverse Single Spin Asymmetry in Electron-Proton Elastic Scattering at Forward Angles over a Wide Energy Range | | B. Gou
; J. Arvieux
; K. Aulenbacher
; D. Balaguer Ríos
; S. Baunack
; D. Becker
; L. Capozza
; W. Deconinck
; J. Diefenbach
; R. Frascaria
; M. Gorchtein
; B. Gläser
; D. von Harrach
; Y. Imai
; E. M. Kabuß
; R. Kothe
; S. Kowalski
; R. Kunne
; F. E. Maas
; H. Merkel
; M. C. Mora Espí
; M. Morlet
; U. Müller
; S. Ong
; E. Schilling
; C. Weinrich
; J. van de Wiele
; M. Zambrana
; I. Zimmermann
; | | Date: |
14 Feb 2020 | | Abstract: | We report on a new measurement of the beam transverse single spin asymmetry
in electron-proton elastic scattering, $A^{ep}_{perp}$, at five beam energies
from 315.1 MeV to 1508.4 MeV and at a scattering angle of $30^{circ} < heta
< 40^{circ}$. The covered $Q^2$ values are 0.032, 0.057, 0.082, 0.218, 0.613
(GeV/c)$^2$. The measurement clearly indicates significant inelastic
contributions to the two-photon-exchange (TPE) amplitude in the low-$Q^2$
kinematic region. No theoretical calculation is able to reproduce our result.
Comparison with a calculation based on unitarity, which only takes into account
elastic and $mathrm{pi N}$ inelastic intermediate states, suggests that there
are other inelastic intermediate states such as $mathrm{pi pi N}$,
$mathrm{K Lambda}$ and $mathrm{eta N}$. Covering a wide energy range, our
new high-precision data provide a benchmark to study those intermediate states. | | Source: | arXiv, 2002.6252 | | Services: | Forum | Review | PDF | Favorites | |
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