Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic predictions of quasielastic proton-nucleus spin observables
  based on a complete Lorentz invariant representation of the NN scattering
  matrix   Within the framework of the relativistic plane wave impulse approximation
(RPWIA), complete sets of quasielastic $(\vec{p}, \vec{p}^{'})$ and $(\vec{p},
\vec{n})$ spin observables are calculated employing a general Lorentz invariant
representation of the NN scattering matrix (referred to as the IA2
representation). The use of a complete representation eliminates the
arbitrariness of a previously-used five-term parameterization (commonly called
the IA1 representation) and allows for the correct incorporation of
effective-mass-type medium effects within the RPWIA framework and within the
context of the Walecka model. For quasielastic scattering from a $^{40}$Ca
target at incident proton energies between 200 and 500 MeV, we investigate the
sensitivity of complete sets of spin observables to effective nucleon masses
for both IA1 and IA2 representations. In general it is seen that the IA1
representation may overestimate the importance of nuclear medium effects,
whereas the IA2-based predictions nearly correspond to values for free
nucleon-nucleon scattering.

28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th