搜索结果: 1-15 共查到“物理学 pi pi”相关记录22条 . 查询时间(0.031 秒)
K ->pi pi phenomenology in the presence of electromagnetism
Electromagnetic the dollar the electromagnetic radiation
2014/12/22
We describe the influence of electromagnetism on the phenomenology of $K \to \pi\pi$ decays. This is required because the present data were analyzed without inclusion of electromagnetic radiative corr...
Electromagnetic corrections to K ->pi pi. II. Dispersive matching
Electromagnetic virtual photons chiral perturbation theory the model of the resonance
2014/12/22
We express the leading electromagnetic corrections in K → ππ as integrals over the virtual photon squared-momentum Q2. The high Q2 behavior is obtained via the operator product expansion. The low Q2 b...
Electromagnetic corrections to K ->pi pi. I. Chiral perturbation theory
Electromagnetic octet chiral perturbation theory the amplitude
2014/12/22
An analysis of electromagnetic corrections to the (dominant) octet K → ππ hamiltonian using chiral perturbation theory is carried out. Relative shifts in amplitudes at the several per cent level are f...
Determination of <(pi pi)I=2/ohm 7,8/K0 > in the chiral limit
Weak matrix elements no cover dispersion
2014/12/22
We reconsider the dispersive evaluation of the weak matrix elements h()I=2|Q7,8|K0i in the chiral limit. The perturbative matching is accomplished fully within the scheme dependence used in the two ...
K ->pi pi electroweak penguins in the chiral limit
Dispersion electroweak penguin matrix element chiral limit
2014/12/20
We report on dispersive and finite energy sum rule analyses of the electroweak penguin matrix elements left angle bracket(ππ)2|Q7,8|K0right-pointing angle bracket in the chiral limit. We accomplish th...
Starting from hyperbolic dispersion relations, we derive a system of Roy--Steiner equations for pion Compton scattering that respects analyticity, unitarity, gauge invariance, and crossing symmetry.
Starting from hyperbolic dispersion relations, we derive a system of Roy--Steiner equations for pion Compton scattering that respects analyticity, unitarity, gauge invariance, and crossing symmetry. I...
We re-examine the question of measuring the weak phase in B → K decays.
The phase-shift of isospin-2 pi-pi scattering from lattice QCD
The phase-shift of isospin-2 pi-pi scattering lattice QCD
2011/1/7
Finite-volume lattice QCD calculations offer the possibility of extracting resonance parameters from the energy-dependent elastic phase-shift computed using the Luescher technique. In this letter, as ...
K --> pi pi matrix elements from mixed action lattice QCD
K --> pi pi matrix elements mixed action lattice QCD
2011/1/7
We present a new method for determining K --> pi pi matrix elements from lattice simulations that is less costly than direct simulations of K --> pi pi at physical kinematics. It improves, however, up...
Final state interactions and CP violation in B+- --> pi+- pi-+ pi+- decays
Final state interactions CP violation in B+- --> pi+- pi-+ pi+- decays
2011/1/5
We study CP violation and the contribution of the strong pion-pion interactions in the three-body B± →π±π∓π± decays within a quasi two-body QCD factorization approach. The short distance interac...
Are scalar mesons visible in B+- --> pi+pi-pi+- decays?
scalar mesons visible B+- --> pi+pi-pi+- decays
2011/1/5
Two pion effective mass and helicity angle distributions in the charged B-meson decays into three charged pions are studied. The weak decay amplitudes are calculated in the framework of the QCD factor...
Tetraquark-based analysis and predictions of the cross sections and distributions for the processes e^+ e^- --> Upsilon(1S) (pi^+ pi^-, K^+ K^-, eta pi^0) near Upsilon(5S)
processes e^+ e^- --> Upsilon(1S) (pi^+ pi^-, K^+ K^-, eta pi^0) Upsilon(5S)
2011/1/5
We calculate the cross sections and final state distributions for the processes e+e−
!(1S)(+−,K+K−, 0) near the (5S) resonance based on the tetraquark hypothesis. This
framew...
The phase-shift of isospin-2 pi-pi scattering from lattice QCD
phase-shift isospin-2 pi-pi scattering lattice QCD
2011/1/14
Finite-volume lattice QCD calculations o er the possibility of extracting resonance parameters
from the energy-dependent elastic phase-shift computed using the Luscher technique. In this letter,as a...
Precision Measurement of CP Violation in D0->pi+pi- at CDF
Precision Measurement CP Violation D0->pi+pi- at CDF
2011/1/4
We report a preliminary measurement of the CP violating asymmetry in D0 →p+p− using approximately 215·000 decays reconstructed in about 5.94 fb−1 of CDF data.