Related Experiment Video
Updated: Jul 29, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Determining gamma from B --> pi(pi) decays without the CP-asymmetry Cpi(0)pi(0)
Christian W Bauer1, Ira Z Rothstein, Iain W Stewart
1California Institute of Technology, Pasadena, California 91125, USA.
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 Cpi(0)pi(0). SCET predicts that gamma lies close to the isospin bounds. With the current world averages we find gamma = 75 degrees +/- 2 degrees(+9 degrees)(-13 degrees), where the uncertainties are theoretical, then experimental.
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