What can we learn from a measurement of sin(2 beta + gamma)?
  The constraints on the value of the CKM phase gamma that may be achieved by prospective measurements of sin(2 beta) and sin(2 beta + gamma) are discussed. Significant constraints require quite small errors, and may depend on assumptions about strong phases. The measurement of sin(2 beta + gamma) combined with other experiments could provide valuable limits on new physics in Bd-Bdbar mixing. 
Joao P. Silva, Abner Soffer, Lincoln Wolfenstein and Feng Wu