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We propose a new method for obtaining the CP phase alpha, based onmeasurements of B0(d) --> K0 anti-K0, along with theoretical input. Due to thesimilarities of QCD factorization (QCDf) and perturbative QCD (pQCD), thisinput is basically the same for each of these models. Although the theoreticalerror is large at present, many of the contributing quantities will be betterknown in the future, leading to a smaller error. One outstanding question isthe extent to which the precision on quark masses, especially m_c/m_b, can beimproved. If one assumes that new physics is not present, the method can beused to predict the values of CP asymmetries in B0(d) --> K0 anti-K0: 0.02 <=A_{dir}^2 + A_{mix}^2 <= 0.125. A result outside this range would signal theexistence of long-distance effects beyond those included in models ofnonleptonic decays based on factorization (such as QCDf and pQCD), or thepresence of new physics.Comment: 5 pages, To appear in PR

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Extracting the quark mixing phase<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>B</mml:mi><mml:mi>d</mml:mi><mml:mn>0</mml:mn></mml:msubsup><mml:mo>→</mml:mo><mml:msup><mml:mi>K</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:msup><mml:mover accent="true"><mml:mi>K</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mn>0</mml:mn></mml:msup></mml:math>decays

Extracting the quark mixing phaseαfromBd0→K0K¯0decays