نتایج جستجو برای: ππ interactions
تعداد نتایج: 389020 فیلتر نتایج به سال:
Using the large hadroproduced charm sample collected in experiment E791 at Fermilab, we have measured ratios of branching fractions for the two-body singlyCabibbo-suppressed charged decays of the D: Γ(D → KK) Γ(D → Kπ) = 0.109± 0.003± 0.003, Γ(D → ππ) Γ(D → Kπ) = 0.040 ± 0.002 ± 0.003, and Γ(D → KK) Γ(D → ππ) = 2.75 ± 0.15±0.16. We have looked for differences in the decay rates of D andD to the...
A correct understanding and description of the I = 2 ππ S-wave interaction is important for the extraction of the I = 0 ππ S-wave interaction from experimental data and for understanding the I = 0 ππ S-wave interaction theoretically. With t-channel ρ, f 2 (1270) exchange and the ππ → ρρ → ππ box diagram contribution, we reproduce the ππ isotensor S-wave and D-wave scattering phase shifts and in...
The recent observation of B d → ππ and B̄ d → ππ decay modes allows us to make a fresh isospin analysis of B → ππ transitions. We find that current experimental data can impose some model-independent constraints on the parameter space of direct CP violation in Bd → ππ and Bd → ππ. Furthermore, we establish a direct relationship between the weak phase α and the charge-averaged branching fractions...
We present a method of determining the CKM-angle α by performing simultaneous measurements of the mixing-induced CP asymmetries of the decays Bd → ππ and Bd → KK̄. The accuracy of our approach is limited by SU(3)-breaking effects originating from b̄ → d̄ss̄ QCD-penguin diagrams. Using plausible power-counting arguments we show that these uncertainties are expected to be of the same order as those a...
I discuss three B physics results with potential for exhibiting new flavourchanging interactions: (1) the time-dependent CP asymmetry in B → J/ψKS decay; (2) branching fractions and CP asymmetries in B → ππ, πK decays; (3) inclusive and exclusive semi-hadronic b → s transitions.
Three novel nitrogen-containing macrolides have been synthesized by esterification. All of them have been characterized by infrared (IR), elemental analysis, mass spectra (MS), and 1H NMR spectroscopy, and their crystal structures were determined by single-crystal X-ray diffraction. The preparation methods and the intermolecular associations based on C–H· · ·O hydrogen bonds and ππ stacking int...
In this talk I summarize a recently proposed mechanism to understand ππ scattering to 1 GeV. The model is motivated by the 1/NC expansion to QCD, and includes a current algebra contact term and resonant pole exchanges. Chiral symmetry plays an important role in restricting the form of the interactions. The existence of a broad low energy scalar (σ) is indicated.
In this talk I summarize a recently proposed mechanism to understand ππ scattering to 1 GeV. The model is motivated by the 1/NC expansion to QCD, and includes a current algebra contact term and resonant pole exchanges. Chiral symmetry plays an important role in restricting the form of the interactions. The existence of a broad low energy scalar (σ) is indicated.
We discuss the recent literature on the treatment of final state interactions in K → ππ. Various approaches are compared and particular emphasis is given to the possibility of combining dispersive methods with lattice input. Recent results on the dependence of various quantities on the quark masses at order p in the chiral expansion are presented and the relevance for the lattice calculations i...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید