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Factorization based on the soft-collinear effective theory (SCET) can be usedto reduce the number of hadronic parameters in an isospin analysis of B-> pi pidecays by one. This gives a theoretically precise method for determining the CPviolating 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 currentworld averages we find gamma=75^o \pm 2^o {}^{+9^o}_{-13^o}, where theuncertainties are theoretical, then experimental.Comment: 4 pages, journal version, fig.4 fixe

Determining γ from B→ππ Decays without the CP-Asymmetry Cπ0π0