Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Helicity Amplitudes In the Hypercentral Constituent Quark Model   We report on the recent results of the hypercentral constituent quark model.
The model contains a spin independent three-quark interaction which is inspired
by QCD lattice calculations and reproduces the average energy values of the
SU(6) multiplets. The splittings are obtained with a residual generalized
SU(6)-breaking interaction, including an isospin dependent term. The long
standing problem of the Roper resonance is absent and all the 3- and 4-star
states are well reproduced. The model has also been used for predictions
concerning the electromagnetic transition form factors giving a good
description of the medium $Q^2$ -behaviour. In particular the calculated
$S_{11} A_{{1/2}}$ helicity amplitude agrees very well with the recent CLAS
data. Finally the ratio of the elastic form factors of the proton, calculated
including kinematic relativistic corrections, exhibits a substantial decreasing
with $Q^2$ in agreement with the recent TJNAF experiment.

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The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org