Polarization transfer inHe4(e→,

Abstract

Polarization-transfer components for 4 He( e, e ′ p) 3 H and 16 O( e, e ′ p) 15 N are computed within the relativistic multiple-scattering Glauber approximation (RMSGA). The RMSGA framework adopts relativistic single-particle wave functions and electron-nucleon couplings. The predictions closely match those of a relativistic plane-wave model indicating the smallness of the final-state interactions for polarization-transfer components. Also short-range correlations play a modest role for the studied observables, as long as small proton missing momenta are probed in quasi-elastic kinematics.The predictions with free and various parameterizations for the medium-modified electromagnetic form factors are compared to the world data.

Chiral solitons in nuclei: Electromagnetic form factors

“…A RMSGA calculation for the helium reaction studied in Ref. [1] has been done with these CQS model results [25], and it delivers remarkably similar results to the same calculation done with the QMC model [16]. The CQS model predicts a smaller deviation than the QMC model from a relativistic plane wave impulse approximation (RPWIA) calculation, which is taken as a baseline in Ref.…”

“…It is a confining model, whereas the CQS model is not. Additionally, the QMC model calculation, when coupled with a relativistic distorted wave impulse approximation (RDWIA) calculation [14] or a relativistic multiple-scattering glauber approximation (RMSGA) calculation [15,16], improves the agreement between theory and the TJNAF data [1]. With our study, we hope to reinforce the interpretation of the medium effect in terms of quark degrees of freedom, as well as provide an alternate model when the accuracy of the data is improved.…”

Nucleon helicity asymmetries in quasielastic neutrino-nucleus interactions

“…the relativistic plane-wave impulse approximation (RPWIA), is reached by putting this phase to unity. The RMSGA model was successfully tested against exclusive A(e, e ′ p) data [42,43]. The validity of the RMSGA model in the low-energy regime was tested by comparing its predictions to results from an RDWIA calculation [32].…”

Polarization Transfer inH4e(e→,e′p→Schiavilla1, Benhar2, Kievsky3 et al. 2005Phys. Rev. Lett.5751012View full textAdd to dashboardCite

“…For example, the studies of Refs. [7,8], based on relativistic mean field theory, ignore correlation effects in the bound-state wave functions and many-body terms in the electromagnetic operator. Furthermore, FSI are treated with a relativistic optical potential in the work of Udias and collaborators [7], in which the contributions associated with charge-exchange processes are neglected -they will turn out to play an important role in the reaction under consideration; see below.…”

“…Furthermore, FSI are treated with a relativistic optical potential in the work of Udias and collaborators [7], in which the contributions associated with charge-exchange processes are neglected -they will turn out to play an important role in the reaction under consideration; see below. In the work of the Ghent group [8], FSI are described in a Glauber framework, which may not be reliable at the low end of the Q 2 range covered by E93-049, since the ejected proton energies are too low. In addition and more importantly, the charge-exchange mechanism referred to earlier is also not included in this study-indeed, it is not obvious how to incorporate it within the context of a Glauber approach.…”