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.

Ron, G

Zhan, X

Glister, J

Lee, B

Allada, K

Armstrong, W

Arrington, J

Beck, A

Benmokhtar, F

Berman, BL

Boeglin, W

Brash, E

Camsonne, A

Calarco, J

Chen, JP

Choi, Seonho

Chudakov, E

Coman, L

Craver, B

Cusanno, F

Dumas, J

Dutta, C

Feuerbach, R

Freyberger, A

Frullani, S

Garibaldi, F

Gilman, R

Hansen, O

Higinbotham, DW

Holmstrom, T

Hyde, CE

Ibrahim, H

Ilieva, Y

de Jager, CW

Jiang, X

Jones, M

Kelleher, A

Khrosinkova, E

Kuchina, E

Kumbartzki, G

LeRose, JJ

Lindgren, R

Markowitz, P

Beck, S May-Tal

McCullough, E

Meziane, M

Meziani, Z-E

Michaels, R

Moffit, B

Norum, BE

Oh, Y

Olson, M

Paolone, M

Paschke, K

Perdrisat, CF

Piasetzky, E

Potokar, M

Pomatsalyuk, R

Pomerantz, I

Puckett, AJR

Punjabi, V

Qian, X

Qiang, Y

Ransome, R

Reyhan, M

Roche, J

Rousseau, Y

Saha, A

Sarty, AJ

Sawatzky, B

Schulte, E

Shabestari, M

Shahinyan, A

Shneor, R

Sirca, S

Slifer, Karl

Solvignon, P

Song, J

Sparks, R

Subedi, R

Strauch, S

Urciuoli, GM

Wang, K

Wojtsekhowski, B

Yan, X

Yao, H

Zhu, X

Collaboration, Jefferson Lab Hall

published 

November 21, 2011

Nuclear & Particles Physics

Physical Review C: Nuclear Physics  Journal