Report on: K -> (pi pi)_{I=2} decays and twisted boundary conditions

by Nilmani Mathur

Friday 26 Mar 2010, 11:30 → 12:30 Asia/Kolkata

A-304 (Colaba Campus)

C.h.Kim, C.T.Sachrajda (Submitted on 16 Mar 2010) Abstract: We propose a new method to evaluate the Lellouch-Luescher factor which relates the Delta I=3/2 K -> pi pi matrix elements computed on a finite lattice to the physical (infinite-volume) decay amplitudes. The method relies on the use of partially twisted boundary conditions, which allow the s-wave pi pi phase shift to be computed as an almost continuous function of the centre-of-mass relative momentum and hence for its derivative to be evaluated. We successfully demonstrate the feasibility of the technique in an exploratory computation.

Paper http://in.arxiv.org/abs/1003.3191