Lepton-proton two-photon exchange in chiral perturbation theory
نویسندگان
چکیده
منابع مشابه
Two-photon Exchange in Electron-proton Elastic Scattering: Theory Update
Recent theoretical developments in the studies of two-photon exchange effects in elastic electron-proton scattering are reviewed. Two-photon exchange mechanism is considered a likely source of discrepancy between polarized and unpolarized experimental measurements of the proton electric form factor at momentum transfers of several GeV. This mechanism predicts measurable effects that are current...
متن کاملTwo–loop integrals in chiral perturbation theory
We consider chiral perturbation theory in the meson sector at order E 6. In the terminology of the external field technique, the two–loop graphs so generated are of the sunset type. We discuss the evaluation of several of these in the case where the masses of the particles running in the loops are equal. In particular, we present integral representations that are suitable for the evaluation of ...
متن کاملRadiative Muon Capture by a Proton in Chiral Perturbation Theory
The first measurement of the radiative muon capture (RMC) rate on a proton was recently carried out at TRIUMF. The TRIUMF group analyzed the RMC rate, Γ RMC, in terms of the theoretical formula of Beder and Fearing, and found the surprising result that gP ≡ fP (q2 = −0.88mμ) is 1.5 times the value expected from PCAC. To assess the reliability of the theoretical framework used by the TRIUMF grou...
متن کاملChiral two - pion exchange and proton - proton partial - wave analysis
The chiral two-pion exchange component of the long-range pp interaction is studied in an energy-dependent partial-wave analysis. We demonstrate its presence and importance, and determine the chiral parameters ci (i = 1, 3, 4). The values agree well with those obtained from pion-nucleon amplitudes. 11.80.Et, 12.39.Fe, 13.75.Cs, 21.30.-x Typeset using REVTEX
متن کاملTwo-Flavor Chiral Perturbation Theory for Hyperons
The three-flavor chiral expansion for octet baryons has well-known problems with convergence. We show that this three-flavor chiral expansion can be reorganized into a two-flavor expansion thereby eliminating large kaon and eta loop contributions. Issues of the underlying formulation are addressed by considering the effect of strangeness changing thresholds on hyperon masses. While the spin-3/2...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review D
سال: 2020
ISSN: 2470-0010,2470-0029
DOI: 10.1103/physrevd.101.013008