TY - GEN
T1 - New extraction of the e ±elastic scattering cross-section ratio based on phenomenological two-photon exchange corrections
AU - Qattan, I. A.
N1 - Funding Information:
This work was supported by Khalifa University of Science and Technology.
Publisher Copyright:
© 2021 Author(s).
PY - 2021/2/5
Y1 - 2021/2/5
N2 - The proton's electric GEp(Q2) and magnetic GMp(Q2) form factors (FFs) are fundamental quantities in nuclear and elementary particle physics. However, the inconsistency in the results on these FFs and their ratio µpRp=µpGEp/GMp as measured using the conventional Rosenbluth separation method, and the polarization transfer (PT) method suggested a systematic difference between the two techniques. To reconcile these measurements, several studies suggested that missing higher order radiative correction to the electron-proton elastic scattering cross section sR(?, Q2), and in particular two-photon exchange (TPE) corrections should be applied. While several analyses were performed to extract the TPE contributions, the most direct technique for measuring TPE is the comparison of electron-proton and positron-proton elastic scattering. In this study, I present a new extraction of the e± elastic scattering cross-section ratio Re+e- as determined using a new parametrization of the TPE corrections. I then compare my results to several previous phenomenological extractions, TPE hadronic calculations, and existing world data on the ratio Re+e- emphasizing mainly the recent high-Q2 measurements from the CLAS, VEPP-3 Novosibirsk, and OLYMPUS collaborations.
AB - The proton's electric GEp(Q2) and magnetic GMp(Q2) form factors (FFs) are fundamental quantities in nuclear and elementary particle physics. However, the inconsistency in the results on these FFs and their ratio µpRp=µpGEp/GMp as measured using the conventional Rosenbluth separation method, and the polarization transfer (PT) method suggested a systematic difference between the two techniques. To reconcile these measurements, several studies suggested that missing higher order radiative correction to the electron-proton elastic scattering cross section sR(?, Q2), and in particular two-photon exchange (TPE) corrections should be applied. While several analyses were performed to extract the TPE contributions, the most direct technique for measuring TPE is the comparison of electron-proton and positron-proton elastic scattering. In this study, I present a new extraction of the e± elastic scattering cross-section ratio Re+e- as determined using a new parametrization of the TPE corrections. I then compare my results to several previous phenomenological extractions, TPE hadronic calculations, and existing world data on the ratio Re+e- emphasizing mainly the recent high-Q2 measurements from the CLAS, VEPP-3 Novosibirsk, and OLYMPUS collaborations.
UR - http://www.scopus.com/inward/record.url?scp=85101023054&partnerID=8YFLogxK
U2 - 10.1063/5.0036999
DO - 10.1063/5.0036999
M3 - Conference contribution
AN - SCOPUS:85101023054
T3 - AIP Conference Proceedings
BT - Proceedings of the 14th Asia Pacific Physics Conference
A2 - Tou, Teck-Yong
A2 - Yokoyama, Jun'ichi
A2 - Shukor, Roslan Abdul
A2 - Tanaka, Kazuhiro
A2 - Choi, Hyoung Joon
A2 - Matsumoto, Ryoji
A2 - Chin, Oi-Hoong
A2 - Chin, Jia Hou
A2 - Ratnavelu, Kuru
T2 - 14th Asia Pacific Physics Conference, APPC 2019
Y2 - 17 November 2019 through 22 November 2019
ER -