Convergence of chiral effective field theory
نویسندگان
چکیده
منابع مشابه
Chiral effective field theory of ∆(1232) and Compton scattering
Chiral perturbation theory (χPT) is limited to a low-energy domain p ≪ Λ, where p is the momentum of the particles and Λ stands for all the heavy scales such as the masses of the “integrated out” degrees of freedom. In a theory without explicit ∆(1232) fields the limit is set by the excitation energy of the ∆-resonance: ∆ ≡ M∆ −MN ≈ 293 MeV. This limit is clearly seen in Compton scattering off ...
متن کاملImproving the Convergence of NN Effective Field Theory
We study a low-energy effective field theory (EFT) describing the NN system in which all exchanged particles are integrated out. We show that fitting the residue of the S1 amplitude at the deuteron pole, rather than the S1 effective range, dramatically improves the convergence of deuteron observables in this theory. Reproducing the residue ensures that the tail of the deuteron wave function, wh...
متن کاملCharge–dependent nucleon–nucleon potential from chiral effective field theory
We discuss charge symmetry and charge independence breaking in a chiral effective field theory approach for few–nucleon systems based on a modified Weinberg power counting. We construct a two–nucleon potential with bound and scattering states generated by means of a properly regularized Lippmann–Schwinger equation. We systematically introduce strong isospin–violating and electromagnetic operato...
متن کاملThree–Nucleon Forces from Chiral Effective Field Theory
We perform the first complete analysis of nd scattering at next–to–next–to–leading order in chiral effective field theory including the corresponding three–nucleon force and extending our previous work, where only the two–nucleon interaction has been taken into account. The three–nucleon force appears first at this order in the chiral expansion and depends on two unknown parameters. These two p...
متن کاملElectromagnetic nucleon-to-delta transition in chiral effective-field theory.
We perform a relativistic chiral effective-field theory calculation of pion electroproduction off the nucleon (e- N --> e- N(pi)) in the delta(1232)-resonance region. After fixing the three low-energy constants, corresponding to the magnetic (M1), electric (E2), and Coulomb (C2) gammaNdelta couplings, our calculation provides a prediction for the momentum transfer and pion-mass dependence of th...
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: Progress in Particle and Nuclear Physics
سال: 2003
ISSN: 0146-6410
DOI: 10.1016/s0146-6410(03)00034-6