scholarly journals Charmonium radiative transitions, meson and glueball particle properties with the effective strong coupling

2019 ◽  
Vol 204 ◽  
pp. 08002
Author(s):  
Gurjav Ganbold
Keyword(s):  
Strong Coupling ◽  
Freezing Point ◽  
Gluon Condensate ◽  
Weak Decay ◽  
Scalar Glueball ◽  
Particle Properties ◽  
Radiative Transitions ◽  
Specific Behaviour ◽  
Quark Models ◽  
Mass Dependent

The particle properties of conventional mesons and scalar glueball, radiative transitions of charmonium excited states χcJ (J = 0, 1, 2) are studied in the framework of relativistic quark models with infrared confinement by taking into account the mass dependence of the effective strong coupling. A specific behaviour of the mass-dependent strong coupling with a freezing point αs (0) = 1.032 has been revealed. The spectrum and leptonic (weak) decay constants of conventional mesons have been calculated in good agreement with the latest experimental data. New estimates on the scalar glueball mass, ’radius’ and gluon condensate value have been obtained. Dominant radiative transitions of the charmonium orbital excitations χcJ → J/ψ + γ have been studied and the partial decay widths have been estimated with reasonable accuracy.

scholarly journals Strong Effective Coupling, Meson Ground States, and Glueball within Analytic Confinement

Particles ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 180-196 ◽  
Author(s):  
Gurjav Ganbold
Keyword(s):  
Freezing Point ◽  
Gluon Condensate ◽  
Meson Mass ◽  
Minimal Set ◽  
Running Coupling ◽  
Hadron Mass ◽  
Relative Errors ◽  
The Masses ◽  
Mass Dependent ◽  
Good Agreement

The phenomena of strong running coupling and hadron mass generating have been studied in the framework of a QCD-inspired relativistic model of quark-gluon interaction with infrared-confined propagators. We derived a meson mass equation and revealed a specific new behavior of the mass-dependent strong coupling α ^ s ( M ) defined in the time-like region. A new infrared freezing point α ^ s ( 0 ) = 1.03198 at origin has been found and it did not depend on the confinement scale Λ > 0 . Independent and new estimates on the scalar glueball mass, ‘radius’ and gluon condensate value have been performed. The spectrum of conventional mesons have been calculated by introducing a minimal set of parameters: the masses of constituent quarks and Λ . The obtained values are in good agreement with the latest experimental data with relative errors less than 1.8 percent. Accurate estimates of the leptonic decay constants of pseudoscalar and vector mesons have been performed.

scholarly journals A FIVE-DIMENSIONAL TOY MODEL FOR LIGHT HADRON EXCITATIONS

2010 ◽  
Vol 25 (20) ◽  
pp. 3933-3940 ◽  
Author(s):  
S. S. AFONIN
Keyword(s):  
Scalar Field ◽  
Finite Number ◽  
Strong Coupling ◽  
Gluon Condensate ◽  
Strong Coupling Regime ◽  
Meson Spectrum ◽  
Light Hadron ◽  
Discrete States ◽  
Holographic Approach

In the usual holographic approach to QCD, the meson spectrum is generated due to a nontrivial five-dimensional background. We propose an alternative five-dimensional scenario in which the spectrum emerges due to coupling to a scalar field whose condensation is supposed to be dual to the formation of gluon condensate and mimics the scale anomaly in QCD. The spectrum of model has finite number of discrete states plus continuum and reveals a Regge-like behavior in the strong coupling regime.

INVESTIGATING AdS/QCD DUALITY THROUGH THE SCALAR GLUEBALL CORRELATOR

2009 ◽  
Vol 24 (22) ◽  
pp. 4177-4192 ◽  
Author(s):  
P. COLANGELO ◽  
F. DE FAZIO ◽  
F. JUGEAU ◽  
S. NICOTRI
Keyword(s):  
Gluon Condensate ◽  
Dilaton Field ◽  
Wall Model ◽  
Scalar Glueball ◽  
Gluon Condensates ◽  
Soft Wall Model ◽  
Soft Wall ◽  
Point Correlation ◽  
Point Correlation Function

We investigate AdS/QCD duality for the two-point correlation function of the lowest dimension scalar glueball operator, in the case of the IR soft wall model. We point out the role of the boundary conditions for the bulk-to-boundary propagator in determining the gluon condensates. We show how a low energy QCD theorem can be obtained within the AdS approach, together with a gluon condensate close to the commonly accepted value and robust against perturbation of the background dilaton field.

Distinct particle properties between ultrafine and accumulation modes under clean and polluted urban environments

2020 ◽  
Author(s):  
Yuying Wang ◽  
Zhanqing Li ◽  
Renyi Zhang ◽  
Xiaoai Jin ◽  
Qiuyan Wang
Keyword(s):  
Formation Process ◽  
Urban Environments ◽  
Chemical Processes ◽  
Subsequent Growth ◽  
Particle Properties ◽  
Heavy Pollution ◽  
Primary Emissions ◽  
Mass Dependent ◽  
Aerosol Hygroscopicity ◽  
Distinct Particle

<p>In this study, we report a phenomenon of fast changing in aerosol hygroscopicity between clean and pollution periods observed frequently in urban Beijing during winter using a hygroscopicity tandem mobility analyzer (H-TDMA). The cause of this phenomenon and the formation process of particles in different modes are discussed. During clean periods, ultrafine mode particles (Nucleation and Aitken modes) mainly stem from nucleation events with subsequent growth. During heavy pollution periods, they originate chiefly from primary emissions. Coarser-mode particles like accumulation mode particles are mainly from primary emission during clean periods and aqueous reactions during pollution periods. This finding based on H-TDMA measurement can make up the deficiency of mass-dependent instruments in analyzing sources and chemical processes of ultrafine mode particles.</p>

Xenon in Archean barite: Weak decay of 130Ba, mass-dependent isotopic fractionation and implication for barite formation

2009 ◽  
Vol 73 (22) ◽  
pp. 6834-6846 ◽  
Author(s):  
Magali Pujol ◽  
Bernard Marty ◽  
Pete Burnard ◽  
Pascal Philippot
Keyword(s):  
Isotopic Fractionation ◽  
Weak Decay ◽  
Mass Dependent

scholarly journals Casimir operator dependences of nonperturbative fermionic QCD amplitudes

2016 ◽  
Vol 31 (20n21) ◽  
pp. 1650120 ◽  
Author(s):  
H. M. Fried ◽  
T. Grandou ◽  
R. Hofmann
Keyword(s):  
Perturbation Theory ◽  
Gauge Group ◽  
Strong Coupling ◽  
Casimir Operator ◽  
Group Representation ◽  
Fermionic Sector ◽  
Quadratic Casimir Operator ◽  
Rank 2 ◽  
Quark Models ◽  
Schwinger Mechanism

In eikonal and quenched approximations, it is argued that the strong coupling fermionic QCD Green’s functions and related amplitudes depart from a sole dependence on the [Formula: see text] quadratic Casimir operator, [Formula: see text], evaluated over the fundamental gauge group representation. Noted in nonrelativistic quark models and in a nonperturbative generalization of the Schwinger mechanism, an additional dependence on the cubic Casimir operator shows up, in contradistinction with perturbation theory and other nonperturbative approaches. However, it accounts for the full algebraic content of the rank-2 Lie algebra of [Formula: see text]. Though numerically subleading effects, cubic Casimir dependences, here and elsewhere, appear to be a signature of the nonperturbative fermionic sector of QCD.

scholarly journals ON INFLATION AND VARIATION OF THE STRONG COUPLING CONSTANT

2007 ◽  
Vol 16 (06) ◽  
pp. 1043-1052 ◽  
Author(s):  
N. CHAMOUN ◽  
S. J. LANDAU ◽  
H. VUCETICH
Keyword(s):  
Phase Transition ◽  
Strong Coupling ◽  
Early Universe ◽  
Gluon Condensate ◽  
Strong Coupling Constant ◽  
Coupling Constant ◽  
Variation Of Constants

Variation of constants in the very early universe can generate inflation. We consider a scenario where the strong coupling constant was changing in time and where the gluon condensate underwent a phase transition ending the inflation.

Recent Radiative and Collisional Atomic Data of Astrophysical Interest

1988 ◽  
Vol 102 ◽  
pp. 129-132
Author(s):  
K.L. Baluja ◽  
K. Butler ◽  
J. Le Bourlot ◽  
C.J. Zeippen
Keyword(s):  
Mass Production ◽  
Bound States ◽  
Physical Models ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Atomic Data ◽  
Isoelectronic Sequence ◽  
Astrophysical Interest ◽  
Radiative Transitions ◽  
Forbidden Transitions

SummaryUsing sophisticated computer programs and elaborate physical models, accurate radiative and collisional atomic data of astrophysical interest have been or are being calculated. The cases treated include radiative transitions between bound states in the 2p4and 2s2p5configurations of many ions in the oxygen isoelectronic sequence, the photoionisation of the ground state of neutral iron, the electron impact excitation of the fine-structure forbidden transitions within the 3p3ground configuration of CℓIII, Ar IV and K V, and the mass-production of radiative data for ions in the oxygen and fluorine isoelectronic sequences, as part of the international Opacity Project.

HVEM Cryomicroscopy of Frozen Hydrated PTK1 Cells

1990 ◽  
Vol 48 (1) ◽  
pp. 500-501
Author(s):  
E.T. O’Toole ◽  
G.P. Wray ◽  
J.R. Kremer ◽  
J.R. Mcintosh
Keyword(s):  
Liquid Nitrogen ◽  
Phase Contrast ◽  
Culture Medium ◽  
Low Dose ◽  
Ammonium Acetate ◽  
Freezing Point ◽  
Voltage Electron ◽  
Cold Stage ◽  
Humidity Chamber ◽  
Coated Carbon

Ultrarapid freezing and cryomicroscopy of frozen hydrated material makes it possible to visualize samples that have never been exposed to chemical fixatives, dehydration, or stains. In principle, freezing and cryoimaging methods avoid artifacts associated with chemical fixation and processing and allow one to visualize the specimen in a condition that is close to its native state. Here we describe a way to use a high voltage electron microscope (HVEM) for the cryoimaging of frozen hydrated PTK1 cells.PTK1 cells were cultured on formvar-coated, carbon stabilized gold grids. After three days in culture, the grids were removed from the culture medium and blotted in a humidity chamber at 35° C. In some instances, the grids were rinsed briefly in 0.16 M ammonium acetate buffer (pH 7.2) prior to blotting. After blotting, the grids were transferred to a plunging apparatus and plunged into liquid ethane held directly above its freezing point. The plunging apparatus consists of a vertical slide rail that guides the fall of a mounted pair of forceps that clamp the specimen. The forceps are surrounded by a plexiglass humidity chamber mounted over a dewar of liquid nitrogen containing an ethane chamber. After freezing, the samples were transferred to liquid nitrogen and viewed in a JEOL JEM 1000 equipped with a top entry cold stage designed and built by Mr. George Wray (Univ. Colorado). The samples were routinely exposed to electron doses of 1 e/Å2/sec, and viewed at a temperature of −150° C. A GATAN video system was used to enhance contrast and to estimate the correct amount of underfocus needed to obtain phase contrast at various magnifications. Low dose micrographs were taken using two second exposures of Kodak 4463 film. The state of the solid water in the specimen was determined by diffraction using a 30/μm field limiting aperture and a camera length of 1 meter.

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