scholarly journals HEAVY MESON RADIATIVE DECAYS AND LIGHT VECTOR MESON DOMINANCE

1995 ◽  
Vol 10 (17) ◽  
pp. 2467-2478 ◽  
Author(s):  
PANKAJ JAIN ◽  
ARSHAD MOMEN ◽  
JOSEPH SCHECHTER
Keyword(s):  
Vector Meson ◽  
Heavy Baryon ◽  
Bound State ◽  
Heavy Meson ◽  
Coupling Constants ◽  
Vector Meson Dominance ◽  
Baryon Spectrum ◽  
Light Vector ◽  
Pattern Application ◽  
Suitable Notion

Electromagnetic interactions are introduced in the effective chiral Lagrangian for heavy mesons which includes light vector particles. A suitable notion of vector meson dominance is formulated. The constraints on the heavy meson-light vector and heavy meson-light pseudoscalar coupling constants are obtained using experimental D*→Dγ branching ratios. These constraints are compared with values estimated from semileptonic transition amplitudes as well as from extension of the light meson coupling pattern. Application to the heavy baryon spectrum in the “bound state” model is made.

scholarly journals VECTOR MESON DOMINANCE AND RADIATIVE DECAYS OF HEAVY SPIN-3/2 BARYONS TO HEAVY SPIN-1/2 BARYONS

2012 ◽  
Vol 27 (11) ◽  
pp. 1250054 ◽  
Author(s):  
T. M. ALIEV ◽  
M. SAVCI ◽  
V. S. ZAMIRALOV
Keyword(s):  
Vector Meson ◽  
Light Cone ◽  
Radiative Decay ◽  
Sum Rules ◽  
Coupling Constants ◽  
Radiative Decays ◽  
Vector Meson Dominance ◽  
Qcd Sum Rules ◽  
Light Vector ◽  
Decay Widths

Using the calculated values of the strong coupling constants of the heavy sextet spin-3/2 baryons to sextet and antitriplet heavy spin-1/2 baryons with light vector mesons within the light cone QCD sum rules method, and vector meson dominance assumption, the radiative decay widths are calculated. These widths are compared with the "direct" radiative decay widths predicted in the framework of the light cone QCD sum rules.

scholarly journals Vector-meson production and vector meson dominance

2021 ◽  
Vol 81 (10) ◽  
Author(s):  
Y.-Z. Xu ◽  
S.-Y. Chen ◽  
Z.-Q. Yao ◽  
D. Binosi ◽  
Z.-F. Cui ◽  
...  
Keyword(s):  
Vector Meson ◽  
Meson Production ◽  
Bound State ◽  
Vector Meson Dominance ◽  
Transition Strength ◽  
Momentum Dependence ◽  
Vector Mesons ◽  
Vector Meson Production ◽  
Proton Mass ◽  
Light Vector

AbstractWe consider the fidelity of the vector meson dominance (VMD) assumption as an instrument for relating the electromagnetic vector-meson production reaction $$e + p \rightarrow e^\prime + V + p$$ e + p → e ′ + V + p to the purely hadronic process $$V + p \rightarrow V+p$$ V + p → V + p . Analyses of the photon vacuum polarisation and the photon-quark vertex reveal that such a VMD Ansatz might be reasonable for light vector-mesons. However, when the vector-mesons are described by momentum-dependent bound-state amplitudes, VMD fails for heavy vector-mesons: it cannot be used reliably to estimate either a photon-to-vector-meson transition strength or the momentum dependence of those integrands that would arise in calculations of the different reaction amplitudes. Consequently, for processes involving heavy mesons, the veracity of both cross-section estimates and conclusions based on the VMD assumption should be reviewed, e.g., those relating to hidden-charm pentaquark production and the origin of the proton mass.

scholarly journals f1(1285) → e+e- decay and direct f1 production in e+e- collisions

2018 ◽  
Vol 182 ◽  
pp. 02106
Author(s):  
A.S. Rudenko
Keyword(s):  
Vector Meson ◽  
Cross Section ◽  
Relative Phase ◽  
Charge Asymmetry ◽  
Coupling Constants ◽  
Vector Meson Dominance ◽  
Dominance Model ◽  
Vector Meson Dominance Model

The width of the f1(1285) → e+e+e- decay is calculated in the vector meson dominance model. The result depends on the relative phase between two coupling constants describing f1 → ρ0γ decay. The width Γ( f1 → e+e+e-) is estimated to be ≃ 0:07 - 0:19 eV. Direct f1 production in e+e+e- collisions is discussed, and the e+e+e- → f1 → a0π → ηππ cross section is calculated. Charge asymmetry in the e+e+e- → ηπ+π- reaction due to interference between e+e+e- → f1 and e+e+e- → ηρ0 amplitudes is studied.

scholarly journals Heavy baryon–light vector meson couplings in QCD

2011 ◽  
Vol 852 (1) ◽  
pp. 141-154 ◽  
Author(s):  
T.M. Aliev ◽  
K. Azizi ◽  
M. Savcı
Keyword(s):  
Vector Meson ◽  
Heavy Baryon ◽  
Light Vector Meson ◽  
Light Vector

POSSIBLE MOLECULAR STRUCTURES IN THE HEAVY BARYON SPECTRUM

2014 ◽  
Vol 26 ◽  
pp. 1460123
Author(s):  
D. R. ENTEM ◽  
P. G. ORTEGA ◽  
F. FERNÁNDEZ
Keyword(s):  
Experimental Data ◽  
Bound States ◽  
Constituent Quark ◽  
Heavy Baryon ◽  
Bound State ◽  
Constituent Quark Model ◽  
Molecular Structures ◽  
Baryon Spectrum ◽  
Small Binding Energy ◽  
Bottom Baryon

We use a chiral constituent quark model to study possible molecular structures in the heavy baryon spectrum. We first analyze D*N states and we find a bound state in the JP = 3/2- sector with an small binding energy. This state can be identified with the Λc(2940)+. The decays of this state are compatible with the existent experimental data. As a by product a state is predicted in the bottom baryon spectrum as a [Formula: see text] state with a mass around 6250 MeV. Moreover we also analyze other DN, D*N, DΔ and D*Δ states and their analogs in the bottom baryon sector finding several bound states.

Light vector meson and heavy baryon strong interaction

2009 ◽  
Vol 80 (9) ◽  
Author(s):  
Peng-Zhi Huang ◽  
Hua-Xing Chen ◽  
Shi-Lin Zhu
Keyword(s):  
Vector Meson ◽  
Strong Interaction ◽  
Heavy Baryon ◽  
Light Vector Meson ◽  
Light Vector

scholarly journals Heavy quark spin multiplet structure of Pc-like pentaquarks as a P-wave hadronic molecular state

2019 ◽  
Vol 2019 (12) ◽  
Author(s):  
Yuki Shimizu ◽  
Yasuhiro Yamaguchi ◽  
Masayasu Harada
Keyword(s):  
Heavy Quark ◽  
Bound States ◽  
Heavy Baryon ◽  
Bound State ◽  
Molecular State ◽  
Heavy Meson ◽  
P Wave ◽  
Exchange Potential ◽  
Multiplet Structure ◽  
Quark Spin

Abstract We study the heavy quark spin (HQS) multiplet structure of P-wave $Q\bar{Q}qqq$-type pentaquarks treated as molecules of a heavy meson and a heavy baryon. We define the light-cloud spin (LCS) basis decomposing the meson–baryon spin wave function into LCS and HQS parts. Introducing the LCS basis, we find HQS multiplets classified by the LCS: five HQS singlets, two HQS doublets, and three HQS triplets. We construct the one-pion exchange potential respecting the heavy quark spin and chiral symmetries to demonstrate which HQS multiplets are realized as a bound state. By solving the coupled channel Schrödinger equations, we study the heavy meson–baryon systems with $I=1/2$ and $J^P=(1/2^+, 3/2^+, 5/2^+, 7/2^+)$. The bound states which have the same LCS structure are degenerate at the heavy quark limit, and the degeneracy is resolved for finite mass. This HQS multiplet structure will be measured in future experiments.

AN EFFECTIVE LAGRANGIAN CALCULATION OF THE SEMILEPTONIC DECAY MODES OF THE τ LEPTON

1990 ◽  
Vol 05 (14) ◽  
pp. 2737-2753 ◽  
Author(s):  
ERIC BRAATEN ◽  
ROBERT J. OAKES ◽  
SZE-MAN TSE
Keyword(s):  
Vector Meson ◽  
Ad Hoc ◽  
Semileptonic Decay ◽  
Branching Fractions ◽  
Decay Rates ◽  
Coupling Constants ◽  
Vector Meson Dominance ◽  
Decay Modes ◽  
Effective Lagrangian ◽  
Pseudoscalar Mesons

The semileptonic decay rates of the τ lepton into final states containing up to three pseudoscalar mesons are calculated using a general low energy effective Lagrangian for pseudoscalar and vector mesons with U (3)× U (3) chiral symmetry. Symmetry breaking is taken into account in the meson masses and mixing angles. All of the coupling constants in the Lagrangian are determined empirically from vector meson decay data without additional ad hoc hypotheses such as vector meson dominance. The results compare well with the measured decay rates where data are available. No unexpectedly large branching fractions are found that might account for the “missing” decay modes of the τ.

Sign in / Sign up

Export Citation Format

Share Document