Details

Autor(en) / Beteiligte

• Valderrama, M. Pavón
• Sánchez, M. Sánchez
• Yang, C.-J.
• Long, Bingwei
• Carbonell, J.
• van Kolck, U.

Titel

Power counting in peripheral partial waves: The singlet channels

Ist Teil von

• Physical review. C, 2017-05, Vol.95 (5), Article 054001

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We analyze the power counting of the peripheral singlet partial waves in nucleon-nucleon scattering. In agreement with conventional wisdom, we find that pion exchanges are perturbative in the peripheral singlets. We quantify from the effective field theory perspective the well-known suppression induced by the centrifugal barrier in the pion-exchange interactions. By exploring perturbation theory up to fourth order, we find that the one-pion-exchange potential in these channels is demoted from leading to subleading order by a given power of the expansion parameter that grows with the orbital angular momentum. We discuss the implications of these demotions for few-body calculations: though higher partial waves have been known for a long time to be irrelevant in these calculations (and are hence ignored), here we explain how to systematize the procedure in a way that is compatible with the effective field theory expansion.