Charge-Symmetry Breaking and the Two-Pion-Exchange Two-Nucleon Interaction
نویسنده
چکیده
Charge-symmetry breaking in the nucleon-nucleon force is investigated within an effective field theory, using a classification of isospin-violating interactions based on power-counting arguments. The relevant charge-symmetry-breaking interactions corresponding to the first two orders in the power counting are discussed, including their effects on the 3He − 3H binding-energy difference. The static charge-symmetry-breaking potential linear in the nucleon-mass difference is constructed using chiral perturbation theory. Explicit formulae in momentum and configuration spaces are presented. The present work completes previously obtained results.
منابع مشابه
Isospin Violation in the Two–nucleon System
I discuss isospin violation in an effective field theory appraoch of the nucleon– nucleon interaction. The observed leading order charge independence breaking is explained in terms of one–pion exchange together with a four–nucleon contact term. A general classification scheme of corrections to this leading order results is presented and an explanation is offered why charge–dependent pion–nucleo...
متن کاملDominant 2πγ-exchange nucleon-nucleon interaction: Spin-spin and tensor potentials
We calculate at two-loop order in chiral perturbation theory the electromagnetic corrections to the two-pion exchange nucleon-nucleon interaction that is generated by the isovector spin-flip ππNN contact-vertex proportional to the large low-energy constant c4 ≃ 3.4GeV−1. We find that the respective 2πγ-exchange potentials contain sizeable isospinbreaking components which reach up to −4% of corr...
متن کامل0 60 50 40 v 1 1 8 M ay 2 00 6 Electromagnetic corrections to the dominant two - pion exchange nucleon - nucleon potential N . Kaiser
We calculate at two-loop order in chiral perturbation theory the electromagnetic corrections to the dominant two-pion exchange nucleon-nucleon interaction that is generated by the isoscalar πN contact-vertex proportional to the large low-energy constant c 3. We find that the respective 2πγ-exchange potential contains sizeable isospin-breaking components which amount to about −1% of the strongly...
متن کاملCharge-Independence Breaking in the Two-Pion-Exchange Nucleon-Nucleon Force
Charge-independence breaking due to the pion-mass difference in the (chiral) two-pion-exchange nucleon-nucleon force is investigated. A general argument based on symmetries is presented that relates the charge-symmetric part of that force to the proton-proton case. The static potential linear in that mass difference is worked out as an explicit example by means of Feynman diagrams, and this con...
متن کاملCharge independence breaking and charge symmetry breaking in the nucleon–nucleon interaction from effective field theory
We discuss charge symmetry and charge independence breaking in an effective field theory approach for few–nucleon systems. We systematically introduce strong isospin–violating and electromagnetic operators in the theory. The charge dependence observed in the nucleon–nucleon scattering lengths is due to one–pion exchange and one electromagnetic four–nucleon contact term. This gives a parameter f...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2003