Rearranging pionless effective field theory

✍ Scribed by Silas R. Beane; Martin J. Savage

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 218 KB
• Volume: 694
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(01)01088-0

✦ Synopsis

We point out a redundancy in the operator structure of the pionless effective field theory, EFT(/ π), which dramatically simplifies computations. This redundancy is best exploited by using dibaryon fields as fundamental degrees of freedom. In turn, this suggests a new power counting scheme which sums range corrections to all orders. We explore this method with a few simple observables: the deuteron charge form factor, np → dγ, and Compton scattering from the deuteron. Unlike EFT(/ π), the higher-dimension operators involving electroweak gauge fields are not renormalized by the s-wave strong interactions, and therefore do not scale with inverse powers of the renormalization scale. Thus, naive dimensional analysis of these operators is sufficient to estimate their contribution to a given process.  2001 Published by Elsevier Science B.V.