TY - JOUR
TI - Investigation of the conjectured nucleon deformation at low momentum
transfer
AU - Sparveris, NF
AU - Alarcon, R
AU - Bernstein, AM
AU - Bertozzi, W and
AU - Botto, T
AU - Bourgeois, P
AU - Calarco, J
AU - Casagrande, F
AU - Distler,
AU - MO
AU - Dow, K
AU - Farkondeh, M
AU - Georgakopoulos, S
AU - Gilad, S and
AU - Hicks, R
AU - Holtrop, M
AU - Hotta, A
AU - Jiang, X
AU - Karabarbounis, A
AU - and Kirkpatrick, J
AU - Kowalski, S
AU - Milner, R
AU - Miskimen, R and
AU - Nakagawa, I
AU - Papanicolas, CN
AU - Sarty, AJ
AU - Sato, Y
AU - Sirca, S
AU - and Shaw, J
AU - Six, E
AU - Stave, S
AU - Stiliaris, E
AU - Tamae, T and
AU - Tsentalovich, G
AU - Tschalaer, C
AU - Turchinetz, W
AU - Zhou, ZL and
AU - Zwart, T
JO - Physical Review and Physical Review Letters Index
PY - 2005
VL - 94
TODO - 2
SP - null
PB - AMER PHYSICAL SOC
SN - 0094-0003
TODO - 10.1103/PhysRevLett.94.022003
TODO - null
TODO - We report new precise H(e,e(’)p)pi(0) measurements at the Delta(1232)
resonance at Q(2)=0.127 (GeV/c)(2) obtained at the MIT-Bates
out-of-plane scattering facility which are particularly sensitive to the
transverse electric amplitude (E2) of the gamma(*)N–>Delta
transition. The new data have been analyzed together with those of
earlier measurements to yield precise quadrupole to dipole amplitude
ratios: Re(E-1+(3/2)/M-1+(3/2))=(-2.3+/-0.3(stat+syst)+/-0.6(model))%
and Re(S-1+(3/2)/M-1+(3/2))=(-6.1+/-0.2(stat+syst)+/-0.5(model))% for
M-1+(3/2)=(41.4+/-0.3(stat+syst)+/-0.4(model))(10(-3)/m(pi)(+)). The
derived amplitudes give credence to the conjecture of deformation in
hadrons favoring, at low Q(2), the dominance of mesonic effects.
ER -