10,024 research outputs found
Strong decays of radially excited mesons in a chiral approach
We study radial excitations of pseudoscalar and vector (q bar q) mesons
within a chiral approach. We derive a general form for a chiral Lagrangian
describing processes involving excited pseudoscalar and vector mesons. The
parameters of the chiral Lagrangian are fitted using data and previous
calculations in the framework of the 3P0 model. Finite-width effects are
examined and predictions for mesons previously not discussed are given.
Available experimental data is analyzed whenever possible. Possible hints for
exotic mesons and open interpretation-issues are discussed.Comment: 16 page
Transition between ordinary and topological insulator regimes in two-dimensional resonant magnetotransport
In the two-dimensional case the transition between ordinary and topological
insulator states can be described by a massive Dirac model with the mass term
changing its sign at the transition point. We theoretically investigate how
such a transition manifests itself in resonant transport via localized helical
edge states. The resonance occurs in the middle of the band gap due to a zero
edge-state mode which is protected by the time-reversal symmetry, also when
coupled to the conducting leads. We obtain the explicit dependence of the
resonant conductance on the mass parameter and an external magnetic field. The
proposal may be of practical use, allowing one to determine the orbital
g-factor of helical edge states in two-dimensional topological insulators.Comment: 7 pages, 3 eps figures, Phys. Rev. B (in press
Production of pair in electron-positron annihilation in the Nambu-Jona-Lasinio model
The process is described in the framework of the
expanded NJL model in the energy region from 0.9 GeV to 1.5 GeV. The
contribution of intermediate state with vector mesons , and , where is the first radial
excitation of - meson was taken into account. Results obtained are in
satisfactory agreement with experimental data.Comment: 5 pages, 1 figure, 1 tabl
Two-photon decays of vector mesons and dilepton decays of scalar mesons in dense matter
Two-photon decays of vector mesons and dilepton decays of scalar mesons which
are forbidden in vacuum and can occur in dense baryonic matter due to the
explicit violation of Lorentz symmetry are described within a quark model of
the Nambu--Jona-Lasinio type. The temperature and chemical potential dependence
of these processes is investigated. It is found that their contribution to the
production of photons and leptons in heavy-ion collisions is enhanced near the
conditions corresponding to the restoration of chiral symmetry. Moreover, in
the case of the a_0 meson and especially the \rho-meson, a resonant behaviour
(an additional amplification) is observed due to the degeneration of \rho and
a_0 masses when a hot hadron matter is approaching a chirally symmetric phase.Comment: 20 figures, IOP styl
On Yang-Mills instantons in a spherically symmetric background
We present arguments for the existence of self-dual Yang-Mills instantons for
several spherically symmetric backgrounds with Euclidean signature. The
time-independent Yang-Mills field has finite action and a vanishing energy
momentum tensor and does not disturb the geometry. We conjecture the existence
of similar solutions for any nonextremal SO(3)-spherically symmetric
background.Comment: 6 pages, 3 figures; v2: references adde
rho(omega)-> pi^0 pi^0 gamma, rho(omega) -> eta pi^0 gamma decays in the local quark Nambu--Jona-Lasinio model
The branching ratios and photon spectra of the rare processes rho(omega)->
pi^0 pi^0 gamma, rho(omega) -> eta pi^0 gamma are calculated in the framework
of the standard local quark Nambu--Jona-Lasinio (NJL) model. Three types of
diagrams are considered: the quark box and the pole diagrams with scalar
(sigma,a_0(980)) and vector (rho,omega) mesons. The obtained estimations for
the widths of the processes rho(omega)-> pi^0 pi^0 gamma are in satisfactory
agreement with existing experimental data. Predictions are made for the widths
of the processes rho(omega) -> eta pi^0 gamma.Comment: 6 pages, 5 figure
Nonabelian solutions in AdS_4 and d=11 supergravity
We consider solutions of the four dimensional Einstein-Yang-Mills system with
a negative cosmological constant , where is the nonabelian
gauge coupling constant. This theory corresponds to a consistent truncation of
gauged supergravity and may be uplifted to supergravity. A
systematic study of all known solutions is presented as well as new
configurations corresponding to rotating regular dyons and rotating nonabelian
black holes. The thermodynamics of the static black hole solutions is also
discussed. The generic EYM solutions present a nonvanishing magnetic flux at
infinity and should give us information about the structure of a CFT in a
background SU(2) field. We argue that the existence of these configurations
violating the no hair conjecture is puzzling from the AdS/CFT point of view.Comment: 52 pages; 24 figures; v2: minor changes, references added, version to
be published in PR
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