In-Medium $$\varvec{\rho }$$ ρ -Meson Properties in a Light-Front Approach

Melo, J. P. B. C. de; Tsushima, K.

doi:10.1007/s00601-017-1233-2

Few-Body Syst

2017

DOI: 10.1007/s00601-017-1233-2

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In-Medium $$\varvec{\rho }$$ ρ -Meson Properties in a Light-Front Approach

J. P. B. C. de Melo

K. Tsushima

Abstract: Properties of ρ-meson in symmetric nuclear matter are investigated within a light-front constituent quark model (LFCQM), using the in-medium input calculated by the quark-meson coupling (QMC) model. The LFCQM used here was previously applied in vacuum to calculate the ρ-meson electromagnetic properties, namely, charge G 0 , magnetic G 1 , and quadrupole G 2 form factors, as well as the electromagnetic radius and decay constant. We predict the in-medium modifications of the ρ-meson electromagnetic form factors … Show more

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Cited by 3 publications

References 30 publications

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$$\rho $$–Meson Form-factors in Point form of Poincaré-Invariant Quantum Mechanics

Haurysh

Andreev

2021

Few-Body Syst

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Form-factors investigation of $$\rho ^{\pm }$$ ρ ± –mesons was carried out within the framework of the relativistic quark model, based on point form of Poincaré-invariant quantum mechanics taking into account the internal structure of constituent quarks. It is shown that the parameters of the model obtained from the condition of the agreement of theoretical calculations with experimental data on leptonic decays for light $$\pi ^{\pm }$$ π ± — and $$\rho ^{\pm }$$ ρ ± –mesons lead to the results correlating with calculations in models based on light-front and instant forms of dynamics. The proposed scheme for the combined description of lepton transitions of pseudoscalar and vector mesons that is based on point form of dynamics, leads to the results on the magnetic moment of $$\rho ^{\pm }$$ ρ ± –meson correlating with the experimental data and other models.

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$$\rho $$–Meson Form-factors in Point form of Poincaré-Invariant Quantum Mechanics

Haurysh

Andreev

2021

Few-Body Syst

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ρ-Meson properties in medium

Melo

Tsushima

2019

Physics Letters B

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Properties of ρ-meson in symmetric nuclear matter are investigated in a light-front constituent quark model (LFCQM), using the in-medium inputs calculated by the quark-meson coupling (QMC) model. The LFCQM used in this study was already applied for the studies of the electromagnetic properties of ρ-meson in vacuum, namely, the charge G 0 , magnetic G 1 , and quadrupole G 2 form factors, electromagnetic charge radius, and electromagnetic decay constant. Using the two different density dependence of the regulator mass in medium, we predict that the charge radius, and quadrupole moment are enhanced as increasing the nuclear matter density, while the magnetic moment is slightly quenched. Furthermore, we predict the value Q 2 zero , which crosses zero of the charge form factor, G 0 (Q 2 zero ) = 0 (Q 2 = −q 2 > 0 with q being the four-momentum transfer), decreases as increasing the nuclear matter density by the two different density dependence of the regulator mass. On the other hand, for the electromagnetic decay constant of the ρ-meson, the two different density dependence of the regulator mass predict the opposite density dependence. Namely, as increasing the nuclear matter density, the naive treatment with the density independent regulator mass as in the vacuum, predicts the increase of the decay constant, while the other that assumes the same density dependence of the regulator mass as that of the in-medium constituent quark mass, predicts the decrease of the decay constant. Thus, although the other physical quantities are predicted to have similar density dependence by the two different density dependence of the regulator mass applied, the density dependence of the ρ-meson electromagnetic decay constant are predicted to have opposite density dependence, and the facts suggest that the in-medium ρ-meson decay constant needs to be investigated further in the future.

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ρ meson magnetic dipole moment from BaBar e+e−→π+π−
Rojas,
Toledo
2024
Phys. Rev. D
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We obtain the value of the magnetic dipole moment of the ρ meson, using data from the collaboration for the e+e−→π+π−2π0 process. The considered center of mass energy range is from 0.9 to 1.8 GeV. We describe the γ*→4π vertex using a vector meson dominance model, including the intermediate resonant contributions relevant at these energies. We find μρ=2.7±0.3 in e/2mρ units. We improve on the previous extracted value, where preliminary data from the same collaboration was used, by considering definite data, better grounded values of the parameters involved, and an explicit gauge invariant description of the process. Published by the American Physical Society 2024

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In-Medium $$\varvec{\rho }$$ ρ -Meson Properties in a Light-Front Approach

Cited by 3 publications

References 30 publications

$$\rho $$–Meson Form-factors in Point form of Poincaré-Invariant Quantum Mechanics

$$\rho $$–Meson Form-factors in Point form of Poincaré-Invariant Quantum Mechanics

ρ-Meson properties in medium

ρ meson magnetic dipole moment from BaBar e+e−→π+π−
Rojas,
Toledo
2024
Phys. Rev. D
0
0
0
0
View full text Add to dashboard Cite

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In-Medium $$\varvec{\rho }$$ ρ -Meson Properties in a Light-Front Approach

Cited by 3 publications

References 30 publications

$$\rho $$–Meson Form-factors in Point form of Poincaré-Invariant Quantum Mechanics

$$\rho $$–Meson Form-factors in Point form of Poincaré-Invariant Quantum Mechanics

ρ-Meson properties in medium

ρ meson magnetic dipole moment from BaBar e+e−→π+π−Rojas, Toledo 2024Phys. Rev. D0000View full textAdd to dashboardCite

Contact Info

Product

Resources

About

ρ meson magnetic dipole moment from BaBar e+e−→π+π−
Rojas,
Toledo
2024
Phys. Rev. D
0
0
0
0
View full text Add to dashboard Cite