Theoretical review on sin2beta(phi_1) from b to s penguins

Chua, Chun-Khiang

doi:10.48550/arxiv.0807.3596

Cited by 1 publication

(2 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the contribution of these CKM-suppressed amplitudes may not be negligible, resulting in a non-zero A ωK 0 S and in a deviation of S ωK 0 S from sin 2φ 1 . Several theoretical methods were used to estimate the effect of these amplitudes, indicating the expected value of S ωK 0 S slightly higher than sin 2φ 1 [3]. However, current experimental measurements indicate the opposite [4,5,6], which might be a consequence of a contribution of new heavy particles in the loop of the penguin diagram [7].…”

Section: Measurement Of Branching Fractions and Cp Violation Paramete...mentioning

confidence: 98%

See 1 more Smart Citation

Time-dependent CP violation in B decays at Belle

Šantelj

2014

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP 2013)

View full text Add to dashboard Cite

Using the full data sample collected with the Belle detector at the KEKB asymmetric-energy e + e − collider, we present three recent measurements of time-dependent CP violation in B decays, and a measurement of branching fraction of the B 0 → ρ 0 ρ 0 decay. We studied B → ωK decays and measured the values of CP violation parameters in B 0 → ωK 0 S to be A ωK 0 S = 0.36 ± 0.19(stat) ± 0.05(syst) and S ωK 0 S = +0.91 ± 0.32(stat) ± 0.05(syst), which gives the first evidence of CP violation in this decay. In addition, we measured the direct CP violation in B + → ωK + to be A CP (B + → ωK + ) = 0.03 ± 0.04(stat) ± 0.01(syst), and two branching fractions B(B 0 → ωK 0 ) = (4.5 ± 0.4(stat) ± 0.3(syst)) × 10 −6 and B(B + → ωK + ) = (6.8 ± 0.4(stat) ± 0.4(syst)) × 10 −6 (preliminary). From the measurement of CP violation parameters in the B 0 → η K 0 decay we obtain S η K 0 = 0.68 ± 0.07(stat) ± 0.03(syst) and A η K 0 = +0.03 ± 0.05(stat) ± 0.03(syst) (preliminary), which are the world's most precise values to date. Measuring CP violating parameters in the B 0 → π + π − decay gives A π + π − = +0.33 ± 0.06(stat) ± 0.03(syst) and S π + π − = −0.64 ± 0.08(stat) ± 0.03(syst). This result is used in an isospin analysis to constrain the φ 2 angle of the unitarity triangle, with which we rule out the region 23.8 • < φ 2 < 66.8 • at the 1σ confidence level. The measured branching fraction of the B 0 → ρ 0 ρ 0 decay is B(B 0 → ρ 0 ρ 0 ) = (1.02 ± 0.30(stat) ± 0.15(syst)) × 10 −6 , with the fraction of longitudially polarized ρ 0 mesons being f L = 0.21 +0.18 −0.22 ± 0.13. From the same measurement we obtain also the first evidence of the B 0 → f 0 ρ 0 decay, by measuring B(B 0 → f 0 ρ 0 ) × B( f 0 → π + π − ) = (0.86 ± 0.27(stat) ± 0.14(syst)) × 10 −6 . Using this result in an isospin analysis we obtain φ 2 = (91.0 ± 7.2) • .

show abstract

Section: Measurement Of Branching Fractions and Cp Violation Paramete...mentioning

confidence: 98%

“…Theoretically this is the cleanest mode to measure CP violation parameters in a b → s qq process, as the contributions from the CKM suppressed diagrams are expected to be 0.02 for both S ηK 0 and A η K 0 [3].…”

Section: Measurement Cp Violation Parameters Inmentioning

confidence: 99%

Time-dependent CP violation in B decays at Belle

Šantelj

2014

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP 2013)

View full text Add to dashboard Cite

show abstract

Theoretical review on sin2beta(phi_1) from b to s penguins

Abstract: Recent theoretical results of the standard model expectations on sin 2β eff from penguin-dominated b → s decays are briefly reviewed.

Cited by 1 publication

References 16 publications

Time-dependent CP violation in B decays at Belle

Time-dependent CP violation in B decays at Belle

Contact Info

Product

Resources

About