Low Q^2 measurements of the proton form factor ratio $mu_p G_E / G_M$

A. Beck; A. Camsonne; A. Freyberger; A. J. Sarty; A. Kelleher; A. Puckett; A. Saha; A. Shahinyan; B. Craver; B.E. Norum

arxiv: 1103.5784 · v2 · pith:NEEGYW5Onew · submitted 2011-03-29 · ⚛️ nucl-ex · nucl-th

Low Q² measurements of the proton form factor ratio mu_p G_E / G_M

G. Ron , X. Zhan , J. Glister , B. Lee , K. Allada , W. Armstrong , J. Arrington , A. Beck

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F. Benmokhtar B.L. Berman W. Boeglin E. Brash A. Camsonne J. Calarco J. P. Chen S. Choi E. Chudakov L. Coman B. Craver F. Cusanno J. Dumas C. Dutta R. Feuerbach A. Freyberger S. Frullani F. Garibaldi R. Gilman O. Hansen D. W. Higinbotham T. Holmstrom C.E. Hyde H. Ibrahim Y. Ilieva C. W. de Jager X. Jiang M. Jones A. Kelleher E. Khrosinkova E. Kuchina G. Kumbartzki J. J. Lerose R. Lindgren P. Markowitz S. May-Tal Beck E. McCullough M. Meziane Z.-E. Meziani R. Michaels B. Moffit B.E. Norum Y. Oh M. Olson M. Paolone K. Paschke C. F. Perdrisat E. Piasetzky M. Potokar R. Pomatsalyuk I. Pomerantz A. Puckett V. Punjabi X. Qian Y. Qiang R. Ransome M. Reyhan J. Roche Y. Rousseau A. Saha A. J. Sarty B. Sawatzky E. Schulte M. Shabestari A. Shahinyan R. Shneor S. Sirca K. Slifer P. Solvignon J. Song R. Sparks R. Subedi S. Strauch G. M. Urciuoli K. Wang B. Wojtsekhowski X. Yan H. Yao X. Zhu

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keywords protonformratiofactormeasurementsanalysisbackgroundcompared

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We present an updated extraction of the proton electromagnetic form factor ratio, mu_p G_E/G_M, at low Q^2. The form factors are sensitive to the spatial distribution of the proton, and precise measurements can be used to constrain models of the proton. An improved selection of the elastic events and reduced background contributions yielded a small systematic reduction in the ratio mu_p G_E/G_M compared to the original analysis.

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Electromagnetic form factors of the nucleon from the instanton vacuum
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Nucleon EM form factors computed in instanton vacuum model with parameters fixed by saddle-point equation yield proton charge radius 0.841 fm matching muonic hydrogen and good agreement on Q2 dependence of ratios.