A New Method for Determining gamma from B-> pi pi Decays

Details A New Method for Determining gamma from B-> pi pi Decays A New Method for Determining gamma from B-> pi pi Decays

2004-12-09

arxiv.org/abs/hep-ph/0412120v3

Phys.Rev.Lett.94:231802,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, journal version, fig.4 fixed

Scientific paper

10.1103/PhysRevLett.94.231802

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.

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