Emilio Del Moral Hernandez

Axial N → Δ(1232) and N → N*(1440) transition form factors

We calculate the axial N → A(1232) and N → N*(1440) transition form factors in a chiral constituent quark model. As required by the partial conservation of axial current (PCAC) condition, we include one- and two-body axial exchange currents. We compare the axial N - A(1232) form factors with previous quark model calculations that use only one-body axial currents, and with experimental analyses. The paper provides the first calculation of all weak axial N → N*(1440) form factors. Our main result is that exchange currents are very important for certain axial transition form factors. In addition to improving our understanding of nucleon structure, the present results are relevant to the neutrino-nucleus scattering cross section predictions needed in the analysis of neutrino mixing experiments.

Isoscalar Roper ( N 1440 * ) excitation in the p p → pp π 0 reaction close to threshold

A new mechanism for the

Axial N{yields}{delta}(1232) and N{yields}N*(1440) transition form factors

pstackrel{ensuremath{rightarrow}}{p}mathrm{pp}{ensuremath{pi}}^{0}

N→Δ(1232)E2transition and Siegert’s theorem

reaction close to threshold is suggested coming from the isoscalar excitation of the Roper and its decay into

Electromagnetic properties of the (1232)

N(ensuremath{pi}ensuremath{pi}{)}_{sensuremath{-}mathrm{w}mathrm{a}mathrm{v}mathrm{e}},

Erratum: Axial N → Δ ( 1232 ) and N → N * ( 1440 ) transition form factors [Phys. Rev. C 75 , 065203 (2007)]

with one of the

Erratum: Axial N{yields}{delta}(1232) and N{yields}N*(1440) transition form factors [Phys. Rev. C 75, 065203 (2007)]

{ensuremath{pi}}^{0}

Axial N(1232) and NN*(1440) transition form factors

emitted and the other one reabsorbed on the second nucleon. We show that this new mechanism can lead to important interference with other mechanisms suggested so far.

Deformation of the nucleon and nucleon-nucleon interaction in the quark model

We calculate the axial N{yields}{delta}(1232) and N{yields}N*(1440) transition form factors in a chiral constituent quark model. As required by the partial conservation of axial current (PCAC) condition, we include one- and two-body axial exchange currents. We compare the axial N{yields}{delta}(1232) form factors with previous quark model calculations that use only one-body axial currents, and with experimental analyses. The paper provides the first calculation of all weak axial N{yields}N*(1440) form factors. Our main result is that exchange currents are very important for certain axial transition form factors. In addition to improving our understanding of nucleon structure, the present results are relevant to the neutrino-nucleus scattering cross section predictions needed in the analysis of neutrino mixing experiments.