scholarly journals ϕ meson mass and decay width in nuclear matter and nuclei

2017 ◽  
Vol 771 ◽  
pp. 113-118 ◽  
Author(s):  
J.J. Cobos-Martínez ◽  
K. Tsushima ◽  
G. Krein ◽  
A.W. Thomas
Keyword(s):  
Nuclear Matter ◽  
Decay Width ◽  
Meson Mass

scholarly journals φ meson mass and decay width in nuclear matter

2003 ◽  
Vol 67 (4) ◽  
Author(s):  
D. Cabrera ◽  
M. J. Vicente Vacas
Keyword(s):  
Nuclear Matter ◽  
Decay Width ◽  
Meson Mass

VECTOR MESON MODIFICATION IN NUCLEAR MATTER AT CLAS

2008 ◽  
Vol 23 (27n30) ◽  
pp. 2417-2420 ◽  
Author(s):  
CHADEN DJALALI ◽  
MIKE WOOD ◽  
RAKHSHA NASSERIPOUR ◽  
DENNIS WEYGAND ◽  
The CLAS COLLABORATION
Keyword(s):  
Vector Meson ◽  
Nuclear Matter ◽  
Leptonic Decay ◽  
Meson Mass ◽  
Combinatorial Background ◽  
Vector Mesons ◽  
Jefferson Lab ◽  
Mass Distributions ◽  
Collisional Broadening ◽  
Large Acceptance

Photoproduction of vector mesons off nuclei were performed at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS). The properties of the ρ vector mesons were investigated via their rare leptonic decay to e+e−. After subtracting the combinatorial background, the ρ meson mass distributions were extracted for each of the targets. We observe no effects on the mass of the ρ meson, some widening in titanium and iron is observed consistent with the collisional broadening.

scholarly journals Effects of meson mass decrease on superfluidity in nuclear matter

1999 ◽  
Vol 445 (3-4) ◽  
pp. 254-258 ◽  
Author(s):  
Masayuki Matsuzaki ◽  
Tomonori Tanigawa
Keyword(s):  
Nuclear Matter ◽  
Meson Mass

scholarly journals h-Meson Decays and Strong UA(1) Breaking in the Three-flavour Nambu - Jona-Lasinio Model

1997 ◽  
Vol 50 (1) ◽  
pp. 187 ◽  
Author(s):  
M. Takizawa ◽  
Y. Nemoto ◽  
M. Oka
Keyword(s):  
Decay Width ◽  
Baryon Number ◽  
Meson Mass ◽  
Mixing Angle ◽  
Meson Decays ◽  
Two Systems ◽  
Experimental Values ◽  
Good Agreement

We study the η → γγ and η → π 0γγ decays using an extended three-flavour Nambu–Jona-Lasinio model that includes the ’t Hooft instanton induced interaction. We find that the η-meson mass, the η → γγ decay width and the η → π 0γγ decay width are in good agreement with the experimental values when the UA(1) breaking is strong and the flavour SU(3) singlet-octet mixing angle θ is about zero. The effects of the UA(1) breaking on the baryon number one and two systems are also studied.

scholarly journals Holographic meson mass splitting in the nuclear matter

2013 ◽  
Vol 2013 (8) ◽  
Author(s):  
Bum-Hoon Lee ◽  
Shahin Mamedov ◽  
Siyoung Nam ◽  
Chanyong Park
Keyword(s):  
Nuclear Matter ◽  
Mass Splitting ◽  
Meson Mass

SIGMA MESON AND PROPERTIES OF NUCLEAR MATTER

2009 ◽  
Vol 18 (05n06) ◽  
pp. 1191-1205
Author(s):  
A. B. SANTRA ◽  
U. LOMBARDO
Keyword(s):  
Nuclear Matter ◽  
Symmetry Energy ◽  
Symmetric Nuclear Matter ◽  
Meson Mass ◽  
Skin Thickness ◽  
Neutron Skin ◽  
Solar Mass ◽  
Hartree Fock ◽  
Hadronic Parameter ◽  
Sigma Meson

We have calculated the saturation observables of symmetric nuclear matter and nuclear symmetry energy in the framework of Brueckner-Hartree-Fock (BHF) formalism with Bonn-B potential as two-body interaction, including modification of hadronic parameter inside nuclear medium. We have found that it is possible to understand all the saturation observables of symmetric nuclear matter by incorporating in-medium modification of the parameters of sigma meson alone. Linear density dependent reduction of σ-nucleon coupling constant by about 6.8% and density independent reduction σ-meson mass by about 3.5% is sufficient to understand nuclear matter saturation observables. We find with the calculated symmetry energy that neutron skin thickness of 208Pb is 0.20 fm and the radius of 1.4 solar mass neutron stars as 11.98 ± 0.75 km.

MEDIUM MODIFICATIONS OF LIGHT VECTOR MESONS IN PHOTOPRODUCTION REACTIONS AT JLAB

2009 ◽  
Vol 24 (02n03) ◽  
pp. 309-316
Author(s):  
◽  
M. H. WOOD ◽  
C. DJALALI ◽  
R. NASSERIPOUR ◽  
D. WEYGAND
Keyword(s):  
Mass Spectrum ◽  
Nuclear Matter ◽  
Mass Spectra ◽  
Decay Channel ◽  
Theoretical Calculations ◽  
Meson Mass ◽  
Vector Mesons ◽  
Small Shift ◽  
Light Vector ◽  
Dense Nuclear Matter

Theoretical calculations predict the modification of properties of vector mesons, such as a shift in their masses and/or broadening of their widths in dense nuclear matter. These effects can be related to partial restoration of chiral symmetry at high density or temperature. The light vector mesons (ρ, ω, and ϕ) were photo-produced on 2 H , C , Ti , Fe , and Pb targets at the Thomas Jefferson National Laboratory using the CEBAF Large Acceptance Spectrometer (CLAS). The data were taken with a beam of tagged photons with energies up to 4 GeV. The properties of the ρ vector meson at normal nuclear densities and zero temperature,were investigated via their rare leptonic decay to e+e-. This decay channel is preferred over hadronic modes in order to eliminate final state interactions in the nuclear matter. A combinatorial background was subtracted from the invariant mass spectra using a well-established event-mixing technique. The ρ meson mass spectrum was extracted after the ω and ϕ signals were removed in a nearly model-independent way. The rho meson mass distributions were extracted for each of the targets. Comparisons were made between the ρ mass spectra from the heavy targets ( A > 2) with the mass spectrum extracted from the deuterium target. With respect to the ρ-meson mass, we obtain a small shift compatible with zero. Also, we measure widths consistent with standard nuclear many-body effects such as collisional broadening and Fermi motion. In this experiment, due to the long lifetimes and momenta greater than 0.8 GeV, the ω and ϕ mesons have a high probability of decaying outside the nucleus in their vacuum state. However, their in-medium widths can be accessed through their absorption inside the nucleus. Preliminary results on the ratios of the nuclear transparencies of the ω and ϕ mesons as a function of the number of target nucleons A, have been obtained and indicate a substantial widening in the medium.

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