Benchmarks for the new-physics search through CP violation in B{sup 0}{yields}{pi}{sup 0}K{sub S}

Journal Article · Mon Dec 01 04:00:00 EST 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.111501· OSTI ID:21250975

Fleischer, Robert; Jaeger, Sebastian ^[1]; Pirjol, Dan ^[2]; Zupan, Jure ^[1]

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1. Theory Division, Department of Physics, CERN, CH-1211 Geneva 23 (Switzerland)
2. National Institute for Physics and Nuclear Engineering, Department of Particle Physics, 077125 Bucharest (Romania)

Using isospin relations, we predict the standard model correlation between S{sub {pi}{sup 0}}{sub K{sub S}}{identical_to}(sin2{beta}){sub {pi}{sup 0}}{sub K{sub S}} and A{sub {pi}{sup 0}}{sub K{sub S}}, the mixing-induced and direct CP asymmetries of B{sup 0}{yields}{pi}{sup 0}K{sub S}. The calculation uses flavor SU(3) only to fix the isospin-3/2 amplitude through the B{sup {+-}}{yields}{pi}{sup {+-}}{pi}{sup 0} 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 A{sub {pi}{sup 0}}{sub K{sub S}}-S{sub {pi}{sup 0}}{sub K{sub S}} plane, where the current experimental data show a discrepancy with the standard model, and comment on the direct CP asymmetries of B{sup 0}{yields}{pi}{sup -}K{sup +} and B{sup +}{yields}{pi}{sup 0}K{sup +}. 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{yields}s penguin-dominated decays.

• OSTI ID: 21250975
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 11 Vol. 78; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
ASYMMETRY
B NEUTRAL MESONS
B PLUS MESONS
BENCHMARKS
BRANCHING RATIO
CP INVARIANCE
FLAVOR MODEL
FORM FACTORS
ISOSPIN
KAONS
KAONS PLUS
LATTICE FIELD THEORY
PIONS NEUTRAL
PIONS PLUS
QUANTUM CHROMODYNAMICS
STANDARD MODEL
SU-3 GROUPS
SYMMETRY BREAKING
WEINBERG-SALAM GAUGE MODEL