Absence of Gluonic Components in Axial and Tensor Mesons
نویسنده
چکیده
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 branching ratios and electromagnetic decays are incompatible with the experimental results. These results suggest the absence of gluonic components in the states of axial and tensor isosinglet mesons analyzed here. [email protected] [email protected] [email protected]
منابع مشابه
On hard electroproduction of mesons: helicity flip amplitudes with tensor gluon contributions
We consider hard electroproduction of mesons at twist-3 level and focus our attention on helicity flip amplitudes corresponding to the production of transversely polarized mesons by transverse photons. We demonstrate that helicity-flip amplitude for the transversely polarized particles are closely related to the contributions of the matrix elements of the tensor gluon operator which can serve a...
متن کاملNucleon spin and the mixing of axial vector mesons.
It is shown that the QCD anomaly may lead to an abnormal mixing behavior of the axial vector mesons similar to the pseudoscalar mesons. These mixing effects, involving a gluonic axial vector state, generate a non-vanishing strange quark component in the nucleon. They reduce the matrix element of the singlet axial vector in comparison to the value obtained in a na¨ıve quark model. The results ar...
متن کاملGLUONIC EFFECTS IN η- and η′-NUCLEON AND NUCLEUS INTERACTIONS
Gluonic degrees of freedom play an important role in the physics of the flavour-singlet J = 1 channel [1] through the QCD axial anomaly [2]. The most famous example is the axial U(1) problem: the masses of the η and η′ mesons are much greater than the values they would have if these mesons were pure Goldstone bosons associated with spontaneously broken chiral symmetry [3]. This extra mass is in...
متن کاملar X iv : h ep - p h / 01 10 26 8 v 3 1 6 N ov 2 00 1 Gluonic effects in vector meson photoproduction at large momentum transfers
Non-perturbative QCD mechanisms are of fundamental importance in strong interaction physics. In particular, the flavor singlet axial anomaly leads to a gluonic pole mechanism which has been shown to explain the η ′ mass, violations of the OZI rule and more recently the proton spin. We show here that the interaction derived from the gluonic pole exchange explains the high momentum transfer behav...
متن کاملar X iv : h ep - p h / 01 10 26 8 v 2 1 5 N ov 2 00 1 Gluonic effects in vector meson photoproduction at large momentum transfers
Non-perturbative QCD mechanisms are of fundamental importance in strong interaction physics. In particular, the flavor singlet axial anomaly leads to a gluonic pole mechanism which has been shown to explain the η ′ mass, violations of the OZI rule and more recently the proton spin. We show here that the interaction derived from the gluonic pole exchange explains the high momentum transfer behav...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2000