scholarly journals Dynamical picture for the exotic XYZ states

2018 ◽  
Vol 192 ◽  
pp. 00042 ◽  
Author(s):  
Mikhail Ivanov
Keyword(s):  
Experimental Data ◽  
Charged Particle ◽  
Experimental Observation ◽  
B Meson ◽  
Effective Interaction ◽  
Bound State ◽  
Decay Rates ◽  
Size Parameter ◽  
Molecular Type ◽  
Decay Widths

We present a dynamical approach for description of the multi-quark states that is based on an effective interaction Lagrangian describing the coupling of hadrons to their constituent quarks. First, we explore the consequences of treating the X(3872) meson as a tetraquark bound state. We calculate the decay widths of the observed channels and conclude that for reasonable values of the size parameter of the X(3872) one finds consistency with the available experimental data. Then we have critically checked the tetraquark picture for the Zc(3900) state by analyzing its strong decays. We found that Zc(3900) has a much more stronger coupling to DD* than to J/Ψπ that is in discord with experiment. As an alternative we have employed a molecular-type four-quark current to describe the decays of the Zc(3900) state as the charged particle in the isotriplet. We found that a molecular-type current gives the values of the above decays in accordance with the experimental observation. By using moleculartype four-quark currents for the recently observed resonances Zb(10610) and Zb(10650), we have calculated their two-body decay rates into a bottomonium state plus a light meson as well as into B-meson pairs.

Hidden-bottom decays of $Z_b/Z_b^\prime$ in intermediate meson loops model

2014 ◽  
Vol 29 ◽  
pp. 1460231
Author(s):  
Gang Li
Keyword(s):  
Experimental Data ◽  
Form Factor ◽  
B Meson ◽  
Recent Measurement ◽  
Threshold Effects ◽  
Cutoff Parameter ◽  
Decay Channels ◽  
Decay Widths ◽  
Range Of Values

With the recent measurement of Zb(10610) and [Formula: see text] and [Formula: see text], we investigate the transitions from the Zb(10610) and Zb(10650) to bottomonium states with emission of a pion via intermediate B B* meson loops. The experimental data can be reproduced in this approach with a commonly accepted range of values for the form factor cutoff parameter α. The ϒ(3S)π decay channels appear to experience obvious threshold effects which can be understood by the property of the loop integrals. By investigating the α-dependence of partial decay widths and ratios between different decay channels, we show that the intermediate B B* meson loops are crucial for driving the transitions of [Formula: see text] with n = 1, 2, 3, and hb(mP)π with m = 1 and 2.

scholarly journals The Ds1(2536)+ Decay Widths in the C3P0 Model

2017 ◽  
Vol 45 ◽  
pp. 1760070
Author(s):  
Hercules B. Rodrigues ◽  
Daniel T. da Silva ◽  
Dimiter Hadjimichef
Keyword(s):  
Bound State ◽  
Pair Creation ◽  
Decay Rates ◽  
Composite Particles ◽  
Charmed Meson ◽  
Initial State ◽  
Simultaneous Treatment ◽  
Relativistic Limit ◽  
Quantum Numbers ◽  
Decay Widths

The Fock-Tani representation is a field theory formalism appropriated for the simultaneous treatment of composite particles and their constituents. The 3P0 model is a typical decay model which considers only OZI-allowed strong decays. The model considers a quark-antiquark pair created with the vacuum quantum numbers in the presence of the initial state meson. It is described as the non-relativistic limit of the pair creation Hamiltonian. Applying the Fock-Tani transformation to the microscopic Hamiltonian of the pair creation produces the characteristic expansion in powers of the wavefunction, where the 3P0 model is the lowest order in the expansion. The corrected 3P0 model (C3P0) is obtained from higher orders in the expansion, by the introduction of the bound state kernel [Formula: see text], called the bound state correction. The goal of this work is to study the application of the 3P0 model and C3P0 model in detail for the strange charmed meson sector ([Formula: see text] meson). In particular, we shall calculate the decay amplitudes and decay rates of the [Formula: see text].

scholarly journals ANALYSIS OF THE $B \to K^*_2(1430), a_2(1320), f_2(1270)$ FORM-FACTORS WITH LIGHT-CONE QCD SUM RULES

2011 ◽  
Vol 26 (37) ◽  
pp. 2761-2782 ◽  
Author(s):  
ZHI-GANG WANG
Keyword(s):  
Experimental Data ◽  
Light Cone ◽  
B Meson ◽  
Sum Rules ◽  
Form Factors ◽  
Distribution Amplitude ◽  
Qcd Sum Rules ◽  
Line Shapes ◽  
The Future

In this paper, we study the [Formula: see text] form-factors with the light-cone QCD sum rules, where the B-meson light-cone distribution amplitudes are used. In calculations, we observe that the line-shapes of the B-meson light-cone distribution amplitude ϕ+(ω) have significant impacts on the values of the form-factors, and expect to obtain severe constraints on the parameters of the B-meson light-cone distribution amplitudes from the experimental data in the future.

scholarly journals Experimental observation of symmetry protected bound state in the radiation continuum in the periodic array of ceramic disks

2018 ◽  
Vol 1124 ◽  
pp. 051057 ◽  
Author(s):  
A A Bogdanov ◽  
M Balezin ◽  
P V Kapitanova ◽  
Z Sadrieva ◽  
M Belyakov ◽  
...  
Keyword(s):  
Experimental Observation ◽  
Bound State ◽  
Periodic Array ◽  
Symmetry Protected

scholarly journals T: A three B-meson bound state

2018 ◽  
Vol 784 ◽  
pp. 169-172 ◽  
Author(s):  
H. Garcilazo ◽  
A. Valcarce
Keyword(s):  
B Meson ◽  
Bound State

The Elastohydrodynamic Traction of a Grease LGLT2

2013 ◽  
Vol 135 (3) ◽  
Author(s):  
Yanshuang Wang ◽  
Pu Li ◽  
JiaWei Cao ◽  
Yan Li
Keyword(s):  
Experimental Data ◽  
Regression Analysis ◽  
Experimental Observation ◽  
Normal Load ◽  
Rolling Speed ◽  
Test Rig ◽  
Lubricating Grease ◽  
Traction Coefficient ◽  
Coefficient Versus

The elastohydrodynamic (EHD) traction coefficients of a lubricating grease LGLT2 were tested at various loads and rolling speeds on a self-made test rig. Traction coefficient versus slide-to-roll ratio curves were generated. Formulae which relate traction coefficient with normal load and rolling speed are put forth. The coefficients of the formulae may be computed by regression analysis of the experimental data. The results show that the calculated traction coefficients agree well with the experimental observation. The critical normal load exists when the traction coefficients change with the normal loads.

scholarly journals NONPERTURBATIVE SOLUTIONS IN THE ELECTROWEAK THEORY WITH $\bar t t$ CONDENSATE AND THE t-QUARK MASS

2011 ◽  
Vol 26 (29) ◽  
pp. 4945-4958 ◽  
Author(s):  
BORIS A. ARBUZOV ◽  
IVAN V. ZAITSEV
Keyword(s):  
Satisfactory Agreement ◽  
Quark Mass ◽  
Effective Interaction ◽  
Electroweak Interaction ◽  
Higgs Doublet ◽  
Bound State ◽  
Heavy Quarks ◽  
Spontaneous Generation ◽  
Composite Higgs ◽  
Compensation Principle

We apply Bogoliubov compensation principle to the gauge electroweak interaction. The nontrivial solution of compensation equations for anomalous three-boson gauge invariant effective interaction uniquely defines its form-factor and parameters of the theory including value of gauge electroweak coupling [Formula: see text] in satisfactory agreement with the experimental value. A possibility of spontaneous generation of effective four-fermion interaction of heavy quarks is demonstrated. This interaction defines an equation for a scalar bound state of heavy quarks which serve as a substitute for the elementary scalar Higgs doublet. As a result we calculate the t-quark mass mt = 177 GeV in satisfactory agreement with the experimental value. The results strongly support idea of [Formula: see text] condensate as a source of the electroweak symmetry breaking. The approach predicts heavy composite Higgs scalar MH ≃ 1800 GeV .

FORMULATION OF NEGATIVELY CHARGED PARTICLE RAPIDITY DISTRIBUTION IN NUCLEUS–NUCLEUS COLLISIONS AT HIGH ENERGY

2000 ◽  
Vol 15 (24) ◽  
pp. 1497-1501 ◽  
Author(s):  
FU-HU LIU
Keyword(s):  
Experimental Data ◽  
Charged Particle ◽  
High Energy ◽  
Rapidity Distribution

The negatively charged particle rapidity distribution in nucleus–nucleus collisions at high energy has been described by the thermalized cylinder picture. The calculated results are compared and found to be in agreement with the experimental data of the reactions 16 O + Au at 60A and 200A GeV, 32 S + Ag and S at 200A GeV, and 208 Pb + Pb at 158A GeV bombarding energies.

scholarly journals FINAL STATE INTERACTIONS IN B → ππK AND $B\to K\overline{K}K$ DECAYS

2007 ◽  
Vol 22 (02n03) ◽  
pp. 645-648
Author(s):  
L. LEŚNIAK ◽  
R. KAMIŃSKI ◽  
B. EL-BENNICH ◽  
B. LOISEAU ◽  
A. FURMAN
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Unitary Representation ◽  
B Meson ◽  
Final State ◽  
B Meson Decays ◽  
Meson Decays ◽  
Neutral B Meson ◽  
Final State Interactions

Analysis of charged and neutral B meson decays into π+π-K, K+K-K and [Formula: see text] is performed using a unitary representation of the ππ and [Formula: see text] final state interactions. Comparison of the theoretical model with the experimental data of the Belle and BaBar Collaborations indicates that charming penguin contributions are necessary to describe the B → f0(980) K and B → ρ(770)0 K decays.

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