Workshop „Physics Opportunities with Proton Beams at SIS100” was held in Wuppertal
PANDA meetings
04/03-08/03 2024 CM 24/1 in Münster
24/06-28/06 2024 CM 24/2 at GSI
25/06-26/06 2024 FEE/DAQ Workshop
04/11-06/11 2024 CM 24/3 at GSI
05/03-07/03 2025 WS at GSI
16/06-20/06 2025 CM 25 in Uppsala
Feasibility studies for the measurement of time-like proton electromagnetic form factors in reactions of the type $\bar{p} p \rightarrow \mu^{+} \mu^{-}$ at PANDA-FAIR
Iris Zimmermann
TA-POS-2017-001.pdf
(7.84 MB)
This contribution presents the current status of the feasibility studies for the measurement of time-like proton electromagnetic form factors (FF's) using reactions of the type $\bar{p} p \rightarrow \mu^{+} \mu^{-}$ at the PANDA experiment at FAIR. Electromagnetic form factors are fundamental quantities which parameterize the electric and magnetic structure of hadrons. In the time-like region, the FF's can be accessed through reactions of the type $p\bar{p}\rightarrow l^{+} l^{-}$, where l = e, $\mu$, under the assumption of one photon exchange. It will be the first time that muon pairs in the final state will be used for the measurement of the TL em FF's of the proton. One advantage of using this channel is that radiative corrections due to final state radiation are suppressed by the heavy mass of the muon. Measuring $\bar{p} p \rightarrow \mu^{+} \mu^{-}$ will also serve as a consistency check of the TL em FF data from $\bar{p} p \rightarrow e^{+} e^{-}$. In frame of the PANDARoot software, which encompasses full detector simulation and event reconstruction, the statistical precision at which the proton FF's will be determined at PANDA is estimated for the signal reaction $p \bar{p} \rightarrow \mu^{+} \mu^{-}$ at different antiproton beam momenta. The signal identification and the suppression of the main background process ($p\bar{p} \rightarrow \pi^{+} \pi^{-}$) are studied. The preliminary results at different beam momenta are presented.