$Q^2$ Dependence of Quadrupole Strength in the $γ^*p\toΔ^+(1232)\to p π^0$ Transition

Details $Q^2$ Dependence of Quadrupole Strength in the $γ^*p\toΔ^+(1232)\to p π^0$ Transition $Q^2$ Dependence of Quadrupole Strength in the $γ^*p\toΔ^+(1232)\to p π^0$ Transition

2001-10-03

arxiv.org/abs/hep-ex/0110007v3

Phys.Rev.Lett.88:122001,2002

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 5 figures, 1 table. To be published in Phys. Rev. Lett. (References, figures and table updated, minor changes.)

Scientific paper

10.1103/PhysRevLett.88.122001

Models of baryon structure predict a small quadrupole deformation of the nucleon due to residual tensor forces between quarks or distortions from the pion cloud. Sensitivity to quark versus pion degrees of freedom occurs through the $Q^2$ dependence of the magnetic ($M_{1+}$), electric ($E_{1+}$), and scalar ($S_{1+}$) multipoles in the $\gamma^* p \to \Delta^+ \to p \pi^0$ transition. We report new experimental values for the ratios $E_{1+}/M_{1+}$ and $S_{1+}/M_{1+}$ over the range $Q^2$= 0.4-1.8 GeV$^2$, extracted from precision $p(e,e 'p)\pi^{\circ}$ data using a truncated multipole expansion. Results are best described by recent unitary models in which the pion cloud plays a dominant role.

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