Details

Autor(en) / Beteiligte

• Zhan, X
• Allada, K
• Armstrong, D S
• Arrington, J
• Bertozzi, W
• Boeglin, W
• Chen, J-P
• Chirapatpimol, K
• Choi, S
• Chudakov, E
• Cisbani, E
• Decowski, P
• Dutta, C
• Frullani, S
• Fuchey, E
• Garibaldi, F
• Gilad, S
• Gilman, R
• Glister, J
• Hafidi, K
• Hahn, B
• Hansen, J-O
• Higinbotham, D W
• Holmstrom, T
• Holt, R J
• Huang, J
• Huber, G M
• Itard, F
• De Jager, CW
• Jiang, X
• Johnson, M
• Katich, J
• De Leo, R
• LeRose, J J
• Lindgren, R
• Long, E
• Margaziotis, D J
• Beck, SMay-Tal
• Meekins, D
• Michaels, R
• Moffit, B
• Norum, B E
• Olson, M
• Piasetzky, E
• Pomerantz, I
• Protopopescu, D
• Qian, X
• Qiang, Y
• Rakhman, A
• Ransome, R D
• Reimer, P E
• Reinhold, J
• Riordan, S
• Ron, G
• Saha, A
• Sarty, A J
• Sawatzky, B
• Schulte, E C
• Shabestari, M
• Shahinyan, A
• Shneor, R
• Sirca, S
• Solvignon, P
• Sparveris, N F
• Strauch, S
• Subedi, R
• Sulkosky, V
• Vilardi, I
• Wang, Y
• Wojtsekhowski, B
• Ye, Z
• Zhang, Y

Titel

High-precision measurement of the proton elastic form factor ratio mu pGE/GM at low Q super(2)

Ist Teil von

• Physics letters. B, 2011-11, Vol.705 (1-2), p.59-64

Erscheinungsjahr

2011

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• We report a new, high-precision measurement of the proton elastic form factor ratio mu pGE/GM for the four-momentum transfer squared [inline image]. The measurement was performed at Jefferson Lab (JLab) in Hall A using recoil polarimetry. With a total uncertainty of approximately 1%, the new data clearly show that the deviation of the ratio mu pGE/GM from unity observed in previous polarization measurements at high Q super(2) continues down to the lowest Q super(2) value of this measurement. The updated global fit that includes the new results yields an electric (magnetic) form factor roughly 2% smaller (1% larger) than the previous global fit in this Q super(2) range. We obtain new extractions of the proton electric and magnetic radii, which are [inline image] and [inline image]. The charge radius is consistent with other recent extractions based on the electron-proton interaction, including the atomic hydrogen Lamb shift measurements, which suggests a missing correction in the comparison of measurements of the proton charge radius using electron probes and the recent extraction from the muonic hydrogen Lamb shift.