نتایج جستجو برای: mesons
تعداد نتایج: 13462 فیلتر نتایج به سال:
We present a covariant approach to describe the low–lying scalar, pseudoscalar, vector and axialvector mesons as quark–antiquark bound states. This approach is based on an effective interaction modeling of the non–perturbative structure of the gluon propagator that enters the quark Schwinger–Dyson and meson Bethe–Salpeter equations. We extract the meson masses and compute the pion and kaon deca...
We show how a field theory containing classical vortex solutions can be expressed as an effective string theory of long distance QCD describing the two transverse oscillations of the string. We use the semiclassical expansion of this effective string theory about a classical rotating string solution to obtain Regge trajectories for mesons with zero mass quarks. The first semiclassical correctio...
Glueball candidates and qq̄ mesons have been found to be produced with different momentum and angular dependences in the central region of pp collisions. This talk illustrates this phenomenon and explains the φ and t dependences of mesons with JPC = 0±+, 1++, 2±+. For production of 0++ and 2++ mesons the analysis reveals a systematic behaviour in the data that appears to distinguish between qq̄ a...
In this review article we present the calculation of the splitting rate in flat space of a macroscopic fundamental string either intersecting at a generic angle a Dp-brane or lying on it. The result is then applied, in the context of the string/gauge theory correspondence, to the study of exclusive decay rates of large spin mesons into mesons. As examples, we discuss the cases of N = 4 SYM with...
A quarkonium-gluonium mixing scheme previously developed to describe the characteristic of the pseudoscalar mesons is applied to axial and tensor mesons. The parameters of the model are determined by fitting the eigenvalues of a mass matrix. The corresponding eigenvectors give the proportion of light quarks, strange quarks and glueball in each meson. However the predictions of the model for bra...
Unlike the quarks, gluons are not very conspicuous in strong interaction physics. The quarks exhibit their flavor quite openly, but gluons act in the background and are difficult to identify. There are plenty of “smoking guns” for the quark degrees of freedom, but it is hard to identify one for the glue, with one exception: The mass and mixing pattern of the 0−+–mesons. In fact, the peculiariti...
In this article, we assume that the (0, 1) strange-bottom mesons are the conventional bs̄ mesons, and calculate the electromagnetic coupling constants d, g1, g2 and g3 using the light-cone QCD sum rules. Then we study the radiative decays Bs0 → B sγ, Bs1 → Bsγ, Bs1 → B sγ and Bs1 → Bs0γ, and observe that the widths are rather narrow. We can search for the (0, 1) strange-bottom mesons in the inva...
A review of the theoretical and experimental status of hybrid hadrons is presented. The states π1(1400), π1(1600), and π1(2015) are thoroughly reviewed, along with experimental results from GAMS, VES, Obelix, COMPASS, KEK, CLEO, Crystal Barrel, CLAS, and BNL. Theoretical lattice results on the gluelump spectrum, adiabatic potentials, heavy and light hybrids, and transition matrix elements are d...
Using data collected near the D{s}{*+}D{s}{-} peak production energy E_{cm}=4170 MeV by the CLEO-c detector, we study the decays of D{s}{+} mesons to two pseudoscalar mesons. We report on searches for the singly Cabibbo-suppressed D{s}{+} decay modes K{+}eta, K{+}eta', pi{+}K{S}{0}, K{+}pi{0}, and the isospin-forbidden decay mode D{s}{+}-->pi{+}pi{0}. We normalize with respect to the Cabibbo-fa...
For the first time, as far as we know, in field theory are found explicit forms of propagators satisfying the Källen – Lehmann representation. To be exact, it is shown that scalar meson propagators, taking into account a virtual intermediate state contribution to the resonance self-energy, satisfy the Källen – Lehmann representation in the wide domain of coupling constants of the light scalar m...
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