TO LEARN LIGHT SCALARS FROM SEMILEPTONIC DECAYS OF HEAVY QUARKONIA

2014 ◽  
Vol 35 ◽  
pp. 1460447 ◽  
Author(s):  
N. N. ACHASOV ◽  
A. V. KISELEV
Keyword(s):  
Dominant Role ◽  
Semileptonic Decays ◽  
Heavy Quarkonia ◽  
Scalar Mesons ◽  
Pseudoscalar Mesons ◽  
Light Scalar

We study the mechanism of production of the light scalar mesons in the [Formula: see text] decays: [Formula: see text], and compare it with the mechanism of production of the light pseudoscalar mesons in the [Formula: see text] decays: [Formula: see text]. We show that the [Formula: see text] transition is negligibly small in comparison with the [Formula: see text] one. As for the the f0(980) meson, the intensity of the [Formula: see text] transition is not more thirty percent from the intensity of the [Formula: see text] ([Formula: see text]) transition. So, the [Formula: see text] decay supports the previous conclusions about a dominant role of the four-quark components in the σ(600) and f0(980) mesons.

scholarly journals Semileptonic decays of charmed mesons to light scalar mesons

2020 ◽  
Vol 102 (1) ◽  
Author(s):  
N. R. Soni ◽  
A. N. Gadaria ◽  
J. J. Patel ◽  
J. N. Pandya
Keyword(s):  
Semileptonic Decays ◽  
Charmed Mesons ◽  
Scalar Mesons ◽  
Light Scalar ◽  
Decays Of Charmed Mesons

scholarly journals UNITARY CHIRAL DYNAMICS IN J/Ψ DECAYS INTO VPP AND THE ROLE OF THE SCALAR MESONS

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1897-1900 ◽  
Author(s):  
L. ROCA ◽  
J. E. PALOMAR ◽  
E. OSET ◽  
H. C. CHIANG
Keyword(s):  
Final State Interaction ◽  
Axial Vector ◽  
Final State ◽  
Mass Distributions ◽  
Scalar Mesons ◽  
Pseudoscalar Mesons ◽  
Unitary Approach ◽  
Chiral Unitary Approach ◽  
Ozi Rule

We make a theoretical study of the J/Ψ decays into ωππ, ϕππ, [Formula: see text] and [Formula: see text] using the techniques of the chiral unitary approach stressing the important role of the scalar resonances dynamically generated through the final state interaction of the two pseudoscalar mesons. We also discuss the importance of new mechanisms with intermediate exchange of vector and axial-vector mesons and the role played by the OZI rule in the J/Ψϕππ vertex, quantifying its effects. The results nicely reproduce the experimental data for the invariant mass distributions in all the channels considered.

scholarly journals Exotic meson decays and polarization asymmetry in hadron environment with chiral imbalance

2018 ◽  
Vol 191 ◽  
pp. 05014 ◽  
Author(s):  
A.E. Putilova ◽  
A.V. Iakubovich ◽  
A.A. Andrianov ◽  
V.A. Andrianov ◽  
D. Espriu
Keyword(s):  
Chemical Potential ◽  
Photon Polarization ◽  
Polarization Asymmetry ◽  
Exotic Meson ◽  
Scalar Mesons ◽  
Pseudoscalar Mesons ◽  
Pion Polarizability ◽  
Vacuum States ◽  
Light Scalar ◽  
The Difference

The possibility of the formation of a local parity breaking in a quark-hadron medium is described as a result of a violation of chiral symmetry, i.e, the difference between the average numbers of right and left -handing quarks in the fireball after HIC.The phenomenology of LPB in the fireball induces the introduction of a topological charge and, accordingly, a topological (chiral) chemical potential. Using the effective meson Lagrangian motivated by QCD in the chiral medium the properties of light scalar and pseudoscalar mesons are analyzed. It is establish that exotic decays of scalar mesons arise as a result of mixing of π and a0 vacuum states in the presence of chiral imbalance. The pion electromagnetic formfactor obtains a parity-odd supplement which generates a photon polarization asymmetry in pion polarizability. We consider that the above-mentioned properties of LPB can be revealed in experiments on LHC, RHIC, CBM FAIR and NICA accelerators.

The nucleon–nucleon interaction. II. Pseudoscalar mesons

1976 ◽  
Vol 54 (3) ◽  
pp. 333-341
Author(s):  
A. Z. Capri ◽  
D. Menon ◽  
R. Teshima
Keyword(s):  
Experimental Data ◽  
Realistic Model ◽  
Nucleon Nucleon ◽  
Nucleon Interaction ◽  
Scalar Mesons ◽  
Pseudoscalar Mesons ◽  
Spin Singlet ◽  
Nucleon Nucleon Interaction ◽  
Isospin Triplet

An earlier paper examined the role of scalar mesons in the nucleon–nucleon interaction. A more realistic model, with pseudoscalar mesons, is studied here. Unlike previous treatments of this problem, this approach seems to yield more repulsion than would be required to reproduce experimental data. Calculations are performed on the spin singlet, isospin triplet state; a brief discussion of the deuteron channel and the resulting potentials is also included.

scholarly journals Decay of light scalar mesons into vector-photon and into pseudoscalar mesons

2010 ◽  
Vol 833 (1-4) ◽  
pp. 138-155 ◽  
Author(s):  
Francesco Giacosa ◽  
Giuseppe Pagliara
Keyword(s):  
Scalar Mesons ◽  
Pseudoscalar Mesons ◽  
Light Scalar

scholarly journals Probing pseudoscalar and scalar mesons in semileptonic decays of $D_s^+$, D+ and D0

2015 ◽  
Vol 30 (02) ◽  
pp. 1550012 ◽  
Author(s):  
Amir H. Fariborz ◽  
Renata Jora ◽  
Joseph Schechter ◽  
M. Naeem Shahid
Keyword(s):  
Semileptonic Decay ◽  
Semileptonic Decays ◽  
Low Energy ◽  
Linear Sigma Model ◽  
Model Parameters ◽  
Final State ◽  
Decay Channels ◽  
Scalar Mesons ◽  
Pseudoscalar Mesons ◽  
Quark Substructure

With the primary motivation of probing the quark substructure of scalar mesons, a generalized linear sigma model for the lowest and the next-to-lowest scalar and pseudoscalar mesons is employed to investigate several semileptonic decays of D mesons. The free parameters of the model (in its leading approximation) have been previously determined from fits to mass spectra and various low-energy parameters. With these fixed parameters, the model has already given encouraging predictions for different low-energy decays and scattering, as well as for semileptonic decay channels of [Formula: see text] that include a scalar meson in the final state. In the present work, we apply the same model (in its leading order with the same fixed parameters) to different semileptonic decay channels of [Formula: see text], D+ and D0. Although these decay channels produce only pseudoscalar mesons in the final states, since various properties of scalar mesons have been used in fixing the model parameters, this study further tests the model and its predictions for the quark substructure of both pseudoscalar as well as scalar mesons. We find that these predictions are in qualitative agreement with experiment.

Chronic Pain: Fundamental Scientific Considerations, Specifically for Legal Claims

2013 ◽  
Vol 18 (1) ◽  
pp. 1-18 ◽  
Author(s):  
Robert J. Barth
Keyword(s):  
Health Outcomes ◽  
Pain Perception ◽  
Driving Forces ◽  
Psychological Treatment ◽  
Dominant Role ◽  
Meta Analysis ◽  
General Medicine ◽  
Pain Syndrome ◽  
Problematic Relationship

Abstract Scientific findings have indicated that psychological and social factors are the driving forces behind most chronic benign pain presentations, especially in a claim context, and are relevant to at least three of the AMA Guides publications: AMA Guides to Evaluation of Disease and Injury Causation, AMA Guides to Work Ability and Return to Work, and AMA Guides to the Evaluation of Permanent Impairment. The author reviews and summarizes studies that have identified the dominant role of financial, psychological, and other non–general medicine factors in patients who report low back pain. For example, one meta-analysis found that compensation results in an increase in pain perception and a reduction in the ability to benefit from medical and psychological treatment. Other studies have found a correlation between the level of compensation and health outcomes (greater compensation is associated with worse outcomes), and legal systems that discourage compensation for pain produce better health outcomes. One study found that, among persons with carpal tunnel syndrome, claimants had worse outcomes than nonclaimants despite receiving more treatment; another examined the problematic relationship between complex regional pain syndrome (CRPS) and compensation and found that cases of CRPS are dominated by legal claims, a disparity that highlights the dominant role of compensation. Workers’ compensation claimants are almost never evaluated for personality disorders or mental illness. The article concludes with recommendations that evaluators can consider in individual cases.

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