Benchmarks for the New-Physics Search through CP Violation in B0→π0KS

Fleischer, Robert, Jäger, Seb, Pirjol, Dan and Zupan, Jure (2008) Benchmarks for the New-Physics Search through CP Violation in B0→π0KS. Physical Review D, 78 (11). pp. 111501-1. ISSN 1550-7998

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Using isospin relations, we predict the standard model correlation between Sπ0KS≡(sin⁡2β)π0KS and Aπ0KS, the mixing-induced and direct CP asymmetries of B0→π0KS. The calculation uses flavor SU(3) only to fix the isospin-3/2 amplitude through the B±→π±π0 branching ratio, and thus has a small irreducible theoretical error. It can reach percent level precision thanks to expected future lattice-QCD progress for the calculation of the relevant SU(3)-breaking form-factor ratio, and serves as a benchmark for new-physics searches. We obtain an interesting picture in the Aπ0KS–Sπ0KS plane, where the current experimental data show a discrepancy with the standard model, and comment on the direct CP asymmetries of B0→π-K+ and B+→π0K+. A modified electroweak penguin with a large new CP-violating phase can explain the discrepancy and allows us to accommodate also the corresponding data for other b→s penguin-dominated decays.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Sebastian Jaeger
Date Deposited: 06 Feb 2012 20:02
Last Modified: 07 Mar 2017 05:48

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