[g2p_ana] Fwd: Paper on GDH and \delta_{LT}

[Jian-Ping Chen]

-------- Forwarded Message --------
Subject: Paper on GDH and \delta_{LT}
Date: Tue, 10 Jan 2017 09:19:41 -0500 (EST)
From: Alexandre Deur <deurpam at jlab.org>
To: jpchen <jpchen at jlab.org>, Vincent Sulkosky <vasulk at jlab.org>, Nguyen 
Ton <ton at jlab.org>, Chao Peng <cpeng at jlab.org>, Karl Slifer 
<slifer at jlab.org>, Sebastian Kuhn <kuhn at jlab.org>, Marco Ripani 
<marco.ripani at ge.infn.it>, Krishna Adhikari <adhikari at jlab.org>

Hello,

In case you have not seen it yet, the following paper on GDH and 
\delta_{LT} appeared on the archive this morning.

Best regards,

Alexandre

arXiv:1701.01947
Date: Sun, 8 Jan 2017 11:46:30 GMT   (181kb,D)

Title: Spin-dependent sum rules connecting real and virtual Compton 
scattering
   verified
Authors: Vadim Lensky, Vladimir Pascalutsa, Marc Vanderhaeghen, Chungwen Kao
Categories: hep-ph nucl-ex nucl-th
Comments: 21 pages, 4 figures, RevTeX 4
Report-no: MITP/16-119
\\
   We present a detailed derivation of the two sum rules relating the spin
polarizabilities measured in real, virtual, and doubly-virtual Compton
scattering. For example, the polarizability $\delta_{LT}$, accessed in
inclusive electron scattering, is related to the spin polarizability
$\gamma_{E1E1}$ and the slope of generalized polarizabilities
$P^{(M1,M1)1}-P^{(L1,L1)1}$, measured in, respectively, the real and the
virtual Compton scattering. We verify these sum rules in different 
variants of
chiral perturbation theory, discuss their empirical verification for the
proton, and prospect their use in studies of the nucleon spin structure.