Speaker
Mattias Sjö
(Lund University)
Description
In recent years, detailed studies of three-pion systems have become possible in lattice QCD. This has in turn led to interest in 3-to-3 scattering of pions in the chiral perturbation theory framework, which complements the lattice results. In particular, it provides a valuable handle on finite-volume effects and the pion mass dependence. I present our derivation of the next-to-leading order amplitude for this process, as well as its conversion into the three-particle K-matrix, which enables direct comparison to the lattice. Our results significantly improve the agreement between theory and lattice, which was poor when only leading-order effects were taken into account.
Author
Mattias Sjö
(Lund University)
Co-authors
Dr
Fernando Romero-López
(MIT)
Johan Bijnens
(Lund University)
Jorge Baeza-Ballesteros
(U. de Valencia)
Prof.
Stephen R. Sharpe
(U. of Washington)
Dr
Tomáš Husek
(Lund U./Charles U.)
