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27 April 2024

» arxiv » 1505.6106

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Measurement of the Beam-Recoil Polarization in Low-Energy Virtual Compton Scattering from the Proton
L. Doria ; P. Janssens ; P. Achenbach ; C. Ayerbe Gayoso ; D. Baumann ; I. Bensafa ; M. Benali ; J. Beričič ; J. C. Bernauer ; R. Böhm ; D. Bosnar ; L. Correa ; N. D'Hose ; X. Defaÿ ; M. Ding ; M. O. Distler ; H. Fonvieille ; J. Friedrich ; J. M. Friedrich ; G. Laveissière ; M. Makek ; J. Marroncle ; H. Merkel ; M. Mihovilovič ; U. Müller ; L. Nungesser ; B. Pasquini ; J. Pochodzalla ; O. Postavaru ; M. Potokar ; D. Ryckbosch ; S. Sánchez Majos ; B. S. Schlimme ; M. Seimetz ; S. Širca ; G. Tamas ; R. Van de Vyver ; L. Van Hoorebeke ; A. Van Overloop ; Th. Walcher ; M. Weinriefer ;
Date:	22 May 2015
Abstract:	Double-polarization observables in the reaction $vec{e}p ightarrow e’vec{p’}gamma{}$ have been measured at $Q^2=0.33 (GeV/c)^2$. The experiment was performed at the spectrometer setup of the A1 Collaboration using the 855 MeV polarized electron beam provided by the Mainz Microtron (MAMI) and a recoil proton polarimeter. From the double-polarization observables the structure function $P_{LT}^perp$ is extracted for the first time, with the value $(-15.4 pm 3.3 (stat.)^{+1.5}_{-2.4} (syst.)) GeV^{-2}$, using the low-energy theorem for Virtual Compton Sattering. This structure function provides a hitherto unmeasured linear combination of the generalized polarizabilities of the proton.
Source:	arXiv, 1505.6106
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