Speaker
Description
Charge asymmetry is examined by comparing the electron/muon---proton scattering with positron/anti-muon---proton scattering. This method is a sophisticated tool for investigating the two-photon exchange phenomenon, which significantly contributes to the radiative corrections to the lepton---proton scattering. The emission of real photons (Bremsstrahlung process) also contributes to the observed charge asymmetry. We present a theoretical framework and numerical analysis of soft photon emission related to charge asymmetry in lepton and antilepton scattering with protons at MUSE kinematics (i.e. at the incident momentum of lepton $p_l = $ $115$ MeV, $153 $ MeV, and $210 $ MeV). We have taken into account the soft-photon bremsstrahlung process and evaluated the bremsstrahlung contribution (real photon emission i.e. $ e^\pm/\mu^\pm (p_l)+ p (P_p) \rightarrow e^\pm/\mu^\pm(p_l^\prime) +p (P_p^\prime) + \gamma (k)$) to the elastic lepton-proton scattering process using heavy baryon chiral perturbation theory, a low-energy effective field theory for QCD. The differential scattering cross-section, evaluated here, is calculated at $\frac{1}{M}$ accuracy, where $M$ is the mass of the proton.
| Field of contribution | Theory |
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