A New Method for Determining gamma from B-> pi pi Decays
High Energy Physics - Phenomenology
2010-11-23 v3 High Energy Physics - Experiment
Abstract
Factorization based on the soft-collinear effective theory (SCET) can be used to reduce the number of hadronic parameters in an isospin analysis of B-> pi pi decays by one. This gives a theoretically precise method for determining the CP violating phase gamma by fitting to the B-> pi pi data without C_{pi0 pi0}. SCET predicts that gamma lies close to the isospin bounds. With the current world averages we find gamma=75^o \pm 2^o {}^{+9^o}_{-13^o}, where the uncertainties are theoretical, then experimental.
Cite
@article{arxiv.hep-ph/0412120,
title = {A New Method for Determining gamma from B-> pi pi Decays},
author = {Christian W. Bauer and Ira Z. Rothstein and Iain W. Stewart},
journal= {arXiv preprint arXiv:hep-ph/0412120},
year = {2010}
}
Comments
4 pages, journal version, fig.4 fixed