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Measurements of the proton elastic-form-factor ratio mu pG p E/G p M at low momentum transfer |
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| Authors: | Ron G Glister J Lee B Allada K Armstrong W Arrington J Beck A Benmokhtar F Berman B L Boeglin W Brash E Camsonne A Calarco J Chen J P 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 D W Holmstrom T Hyde C E Ibrahim H Ilieva Y de Jager C W Jiang X Jones M K Kang H Kelleher A Khrosinkova E Kuchina E Kumbartzki G LeRose J J Lindgren R Markowitz P May-Tal Beck S McCullough E Meekins D Meziane M Meziani Z-E Michaels R Moffit B Norum B E Oh Y Olson M Paolone M Paschke K Perdrisat C F Piasetzky E |
| Affiliation: | Tel Aviv University, Tel Aviv 69978, Israel. |
| Abstract: | High-precision measurements of the proton elastic form-factor ratio, mu pG p E/G p M, have been made at four-momentum transfer, Q2, values between 0.2 and 0.5 GeV2. The new data, while consistent with previous results, clearly show a ratio less than unity and significant differences from the central values of several recent phenomenological fits. By combining the new form-factor ratio data with an existing cross-section measurement, one finds that in this Q2 range the deviation from unity is primarily due to G p E being smaller than expected. |
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