High-precision measurement of the proton elastic form factor ratio μpGE/G M at low Q 2
- 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, C.W.
- Jiang, X.
- Johnson, M.
- Katich, J.
- de Leo, R.
- LeRose, J.J.
- Lindgren, R.
- Long, E.
- Margaziotis, D.J.
- May-Tal Beck, S.
- 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.
- Širca, S.
- Solvignon, P.
- Sparveris, N.F.
- Strauch, S.
- Subedi, R.
- Sulkosky, V.
- Vilardi, I.
- Wang, Y.
- Wojtsekhowski, B.
- Ye, Z.
- Zhang, Y.
DOIAbstract
We report a new, high-precision measurement of the proton elastic form factor ratio μpGE /GM for the four-momentum transfer squared Q 2 = 0.3–0.7 (GeV/c)2. 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 μpGE /GM from unity observed in previous polarization measurements at high Q 2 continues down to the lowest Q 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 2 range. We obtain new extractions of the proton electric and magnetic radii, which are r...
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