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

1 June 2005

journal article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 94 (23) , 231802
https://doi.org/10.1103/physrevlett.94.231802

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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This publication has 32 references indexed in Scilit:

Observation of $B^{0} \to π^{0} π^{0}$
Physical Review Letters, 2005
$B \to M_{1} M_{2}$ : Factorization, charming penguins, strong phases, and polarization
Physical Review D, 2004
Observation of Large $C P$ Violation and Evidence for Direct $C P$ Violation in $B^{0} \to π^{+} π^{-}$ Decays
Physical Review Letters, 2004
Factorization ofBdecays into two light mesons in soft-collinear effective theory
Physical Review D, 2003
Hard scattering factorization from effective field theory
Physical Review D, 2002
Soft-collinear factorization in effective field theory
Physical Review D, 2002
Invariant operators in collinear effective theory
Physics Letters B, 2001
An effective field theory for collinear and soft gluons: Heavy to light decays
Physical Review D, 2001
Summing Sudakov logarithms in $\vec{B} X_{s} γ$ in effective field theory
Physical Review D, 2000
Isospin analysis ofCPasymmetries inBdecays
Physical Review Letters, 1990