Extracting alpha from B0(d) --> K0 anti-K0 Decays

Abstract

We propose a new method for obtaining the CP phase alpha, based on measurements of B0(d) --> K0 anti-K0, along with theoretical input. Due to the similarities of QCD factorization (QCDf) and perturbative QCD (pQCD), this input is basically the same for each of these models. Although the theoretical error is large at present, many of the contributing quantities will be better known in the future, leading to a smaller error. One outstanding question is the extent to which the precision on quark masses, especially m_c/m_b, can be improved. If one assumes that new physics is not present, the method can be used 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 the existence of long-distance effects beyond those included in models of nonleptonic decays based on factorization (such as QCDf and pQCD), or the presence of new physics.

5 pages, To appear in PRD

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Cited by in corpus (7)

• CP violation in the B system
• Flavor dependence of annihilation parameters in QCD factorization
• Penguin-mediated B_(d,s)->VV decays and the Bs - anti-Bs mixing angle
• Penguin pollution estimates relevant for phi_2/alpha extraction
• A solution to B --> pi pi puzzle and B --> K K
• Connecting B_d and B_s decays through QCD factorisation and flavour symmetries
• Extracting the Bs - anti-Bs mixing angle from B--> VV decays and comments on the puzzling B--> K* l+l- decay