LHCb searches for the strong CP-violating decays η → ππ and η′ → ππ
نویسندگان
چکیده
منابع مشابه
- η , η ′ Mixing in B → ππ
An isospin analysis of B → ππ decays yields sin 2α, where α ≡ arg[−VtdV ∗ tb/(VudV ∗ ub)] and Vij is a CKM matrix element, without hadronic uncertainty if isospin is a perfect symmetry. Isospin, however, is broken not only by electroweak effects but also by the u and d quark mass difference. The latter drives π − η, η mixing and converts the isospin-perfect triangle relation between the B → ππ ...
متن کاملSearch for η c Decays into ππ and KK̄
Using 58 million J/ψ events taken with the BESII detector, a search for ηc CP violating decays into ππ and KK̄ has been performed. No clear ηc signal is observed, and upper limits for B(ηc → ππ) and B(ηc → KK̄) are given at the 90% confidence level, B(J/ψ → γηc) · B(ηc → π π) < 1.1 × 10, B(J/ψ → γηc) · B(ηc → π π) < 0.71 × 10, B(J/ψ → γηc) · B(ηc → K K) < 0.96 × 10 and B(J/ψ → γηc) ·B(ηc → K 0 SK...
متن کاملEffects in CP - even and CP - odd K → ππ Decays
Strong isospin-breaking (IB) effects in CP-even and CP-odd K → ππ decays are computed to next-to-leading order (NLO) in the chiral expansion. The impact of these corrections on the magnitude of the ∆I = 1/2 Rule and on the size of the IB correction, ΩIB, to the gluonic penguin contribution to ǫ /ǫ are discussed. In the presence of IB, the standard isospin decomposition of the K → ππ, K → ππ, ππ...
متن کاملStrong Isospin Breaking in CP - even and CP - odd K → ππ Decays
Complete next-to-leading (chiral) order (NLO) expressions for the strong isospin-breaking (IB) contributions in K → ππ are used to discuss (1) for CP-even, the impact on the magnitude of the ∆I = 1/2 Rule, and (2) for CP-odd, the strong IB correction, Ωst, for the gluonic penguin contribution to ǫ /ǫ, with particular emphasis on the strong low-energy constant (LEC) and loop contributions, numer...
متن کاملHadronic η and η ′ decays
The hadronic decays η, η′ → 3π and η′ → ηππ are investigated within the framework of U(3) chiral effective field theory in combination with a relativistic coupled-channels approach. Final state interactions are included by deriving sand p-wave interaction kernels for meson-meson scattering from the chiral effective Lagrangian and iterating them in a Bethe-Salpeter equation. Very good overall ag...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2017
ISSN: 1742-6588,1742-6596
DOI: 10.1088/1742-6596/800/1/012002