Q2 Dependence of quadrupole strength in the gamma*p --> Delta(+)(1232) --> p pi(0) transition

Physical Review Letters
K JooCLAS Collaboration

Abstract

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 Q2 dependence of the magnetic (M1+), electric (E1+), and scalar (S1+) multipoles in the gamma*p-->Delta(+)-->p pi(0) transition. We report new experimental values for the ratios E(1+)/M(1+) and S(1+)/M(1+) over the range Q2 = 0.4-1.8 GeV2, extracted from precision p(e,e(')p)pi(0) data using a truncated multipole expansion. Results are best described by recent unitary models in which the pion cloud plays a dominant role.

References

Jan 1, 1988·Physical Review. D·K BermuthJ B Seaborn
Apr 6, 2001·Physical Review Letters·C MertzA Young

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Citations

Feb 7, 2017·Reports on Progress in Physics·S X NakamuraY Suzuki
Feb 3, 2004·Physical Review Letters·S StepanyanUNKNOWN CLAS Collaboration
Oct 10, 2006·Physical Review Letters·M UngaroUNKNOWN CLAS Collaboration
Oct 4, 2005·Physical Review Letters·J J KellyUNKNOWN Jefferson Laboratory E91011 and Hall A Collaborations
Jun 22, 2013·Reports on Progress in Physics·V Crede, W Roberts
Dec 31, 2005·Physical Review Letters·Vladimir Pascalutsa, Marc Vanderhaeghen
Jul 5, 2002·Physical Review Letters·L D van BuurenZ-L Zhou
Dec 17, 2004·Physical Review Letters·A J Buchmann
Mar 16, 2007·Physical Review Letters·C AlexandrouA Tsapalis
Feb 9, 2005·Physical Review Letters·C AlexandrouA Tsapalis
Feb 9, 2005·Physical Review Letters·N F SparverisT Zwart
Feb 21, 2006·Physical Review Letters·Vladimir PascalutsaMarc Vanderhaeghen

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