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Measurement of the high-energy contribution to the Gerasimov-Drell-Hearn sum rule | | M. M. Dalton
; A. Deur
; C. D. Keith
; S. Širca
; J. Stevens
; | | Date: |
25 Aug 2020 | | Abstract: | We propose to measure the high-energy behavior of the integrand of the
Gerasimov-Drell-Hearn (GDH) sum rule on the proton and the neutron up to 12
GeV. The convergence of the GDH integral will be investigated for the first
time and to high precision. The validity of the GDH sum rule on the neutron
will be accurately tested for the first time, while for the proton the
uncertainty will be improved by $25\%$ relative. The data will allow precision
testing of Regge phenomenology in the polarized domain. The $a_1$ and $f_1$
Regge trajectory intercepts will be obtained to an order of magnitude higher
precision than the current best estimates. The data will also contribute to the
determination of the real and imaginary parts of the spin-dependent Compton
amplitude, the polarizability correction to hyperfine splitting in hydrogen,
and to studying the transition between polarized DIS and diffractive regimes.
The experiment will require a circularly polarized photon beam (produced from
a longitudinally polarized electron beam) with a flux approximately 1/3 of the
GlueX-II experiment E12-13-003. The experiment will run in two configurations
which require two different CEBAF beam energies. A new longitudinal polarized
proton and deuteron target will be needed in Hall D. The experiment will
require 21 PAC days at the nominal CEBAF energy and another 12 PAC days at an
energy 1/3 to 1/2 of the nominal. | | Source: | arXiv, 2008.11059 | | Services: | Forum | Review | PDF | Favorites | |
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