نتایج جستجو برای: mesons
تعداد نتایج: 13462 فیلتر نتایج به سال:
The spectrum of qq̄, J = 0, 2 mesons is discussed. We have shown that due to instanton induced forces the physical states are strong mixtures of the SUf(3) group basis states. The cross-sections for annihilation of the NN̄ system into (qq̄)(qq̄) mesons are obtained. The a0(980) meson is considered as q q̄ meson consisting of 9f and 36f plets. The branchings are also predicted for the cross-sections ...
We present effective-field-theory results with unitarized interactions on the Dmeson transport coefficients in a gas populated by light mesons and baryons at finite temperature and baryochemical potential. The Fokker-Planck equation is used to compute the drag force, the relaxation time and the diffusion coefficients of D mesons for collisions at FAIR. At finite baryochemical potential, the com...
We have used a high-resolution drift chamber in the Mark II Detector at PEP 5 to metiure the lifetimes of Do and D+ mesons produced in e+eannihilations at 29 GeV. Based on a sample of74 decays for the Do mesons and 23 decays for the D+ mesons, the lifetimes are found to be 4.7fi:i f 0.5 x lo-l3 set and 8 9f3*8 . 2., f 1.3 x lo-l3 set, respectively. This leads to a ratio of lifetimes of 1.9”;.“,...
We make the first calculation of the electroweak couplings of hybrid mesons to conventional mesons appropriate to photoproduction and to the decays of B or D mesons. E1 amplitudes are found to be large and may contribute in charge exchange gammap-->nH(+) allowing production of (among others) the charged 1(-+) exotic hybrid off a(2) exchange. Axial hybrid meson photoproduction is predicted to be...
A diverse experimental program for the study of the photoproduction of mesons off nuclei has been carried out and is still running at the Mainz MAMI and Bonn ELSA electron accelerators with the TAPS, Crystal Barrel, and Crystal Ball calorimeters. It is motivated as a detailed study of the in-medium properties of hadrons and the meson nucleus interactions. Typical examples for the in-medium beha...
Some aspects of B physics relevant for experiments in hadron colliders are discussed. These include the determination of parameters of the CKMMatrix and con rmation of its role in CP violation, studies of mixing of nonstrange and strange B mesons, lifetimes of hadrons containing b quarks, the use of \same-side" tagging of neutral B mesons via correlations with charged pions through fragmentatio...
I report on a lattice computation of the energy of a system of two light quarks and two static antiquarks as a function of the separation of the static antiquarks. In terms of hadrons such a system corresponds to a pair of B mesons and its energy to the hadronic potential. I present selected results for different isospin, spin and parity combinations of the individual B mesons mainly focusing o...
We study the decay of high spin mesons using the gauge-string theory correspondence. The rate of the process is calculated by studying the splitting of a macroscopic string intersecting a D-brane. The result is applied to the decay of mesons in N=4 super Yang-Mills theory with a small number of flavors and in a gravity dual of large N QCD. In QCD the decay of high spin mesons is found to be hea...
Mesons containing one heavy quark are a useful laboratory to test QCD models. In the limit of heavy quark mass mQ → ∞, heavy mesons’ properties are governed by the dynamics of the light quark. As such, these states become “hydrogen atoms” of hadron physics. In this Heavy Quark Symmetry approach (see references 1) the quantum numbers of the heavy and light quarks are separately conserved by the ...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید