نتایج جستجو برای: b meson
تعداد نتایج: 908529 فیلتر نتایج به سال:
The study of rare hadronic B-meson decays with branching fractions O(10) enable us to probe a wide range of phenomena. Such decays can be used to probe our understanding of the CKM [1] description of quark mixing and CP violation (CPV ) in the Standard Model of Particle Physics (SM) by measuring all three of the Unitarity Triangle angles α, β and γ, as well as charge asymmetries in direct CPV ∆...
We investigate the B meson light-cone distribution amplitudes in the heavyquark limit which are relevant for the QCD factorization approach for the exclusive B meson decays. We derive exact relations between twoand three-particle distribution amplitudes from the QCD equations of motion and heavy-quark symmetry constraint. As solution of these relations, we give representations for the quark-ant...
After a brief discussion of the promise and limitations of the lattice technique, I review lattice QCD results for several quantities of phenomenological interest. These are: matrix elements for heavy-to-light meson decays, leptonic decay constants f B and f D , the parameters B B and B K for neutral B and K meson mixing respectively, the strong coupling constant, light quark masses and the lig...
Bd and Bs meson systems play a fundamental role to test and improve our understanding of Standard Model flavor dynamics. The mixing parameters ∆md,s represent important constraints in the unitarity triangle analysis. Their theoretical estimates require non-perturbative calculations of B-meson decay constants and B-parameters; accurate results, recently obtained from the lattice, are reviewed. O...
The study of inclusive semileptonic decays of B mesons is analyzed from the viewpoint of probing hadron structure and strong interactions. General formulas for the differential decay rates are given in terms of the structure functions in arbitrary frame of reference, taking into account the finite charged lepton mass. These formulas can be used for structure function measurements. The behavior ...
We have investigated exclusive, radiative B meson decays to charmless mesons (ρ, ω, φ, K(892), K 2 (1430)) in 9.7× 106 BB̄ decays accumulated with the CLEO detector. The B → K(892)γ branching fractions are determined to be B(B0 → K∗0(892)γ) = (4.55 +0.72 −0.68 ± 0.34)×10−5 and B(B+ → K∗+(892)γ) = (3.76 +0.89 −0.83 ± 0.28)×10−5. We have searched for CP asymmetry in B → K(892)γ decays and measure ...
The low-lying bottomoniumlike tetraquarks $b\overline{b}q\overline{q}$ ($q=u$, $d$, $s$) with spin-parity ${J}^{P}={0}^{+}$, ${1}^{+}$, and ${2}^{+}$, isospin $I=0$, 1, or $\frac{1}{2}$, are systematically investigated within the theoretical framework of real- complex-scaling range a chiral quark model, which has already been successfully applied in analysis several multiquark systems. A comple...
In this paper we propose a knot model of the π mesons. In this knot model we give the formation of the π meson by strong interaction and the decay of the π meson to the moun μ and the moun neutrino νμ by weak interaction. We give a mass machanism for the generation of the masses of the π 0 meson, π meson, the moun μ and the moun neutrino νμ. PACS numbers: 12.90.+b, 12.40.Yx, 12.10.Dm.
We report on recent developments and results from Lattice Gauge Theory. These include determinations of the strong coupling constant αs and the b-quark mass Mb and an update on the Kaon B parameter BK . Lattice results for heavy meson decay constants and semileptonic B and D meson decay form factors are reviewed. The first attempts to study the Isgur-Wise function and the radiative Penguin deca...
The beauty hadron decays is unique laboratory to study charmonium and charmonium-like states, such as the $\chi_{c1}(3872)$ meson, other exotic states tensor D-wave $\psi_2(3823$) states. However nature of many candidates are still unknown. most recent LHCb results related b-hadron obtained using large data samples collected during Run 1 2 periods presented. This includes precise determination ...
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