Selfconsistent description of vector-mesons in matter

Riek, F.; Knoll, J.

doi:10.1016/j.nuclphysa.2004.05.010

Cited by 29 publications

(46 citation statements)

References 70 publications

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“…As for the in-medium width of a ω meson at rest, in [33], where the three pion decay mode is explicitly considered, it is found to increase by an order of magnitude at normal nuclear saturation density as compared to the free width, while in a subsequent revision of the model [37] a value of about 40 MeV is reported. A similar result was also reported in [38], while the width was found to be around 60 MeV in [46] and [49]. All these studies point to a considerable increase of the ω width in the medium with respect to its free width.…”

Section: Introductionsupporting

confidence: 85%

The width of the ω meson in the nuclear medium

Ramos

Tolós

Molina³

et al. 2013

Eur. Phys. J. A

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We evaluate the width of the ω meson in nuclear matter. We consider the free decay mode of the ω into three pions, which is dominated by ρπ decay, and replace the ρ and π propagators by their medium modified ones. We also take into account the quasielastic and inelastic processes induced by a vector-baryon interaction dominated by vector meson exchange, as well as the contributions coming from the ω → KK mechanism with medium modified K,K propagators. We obtain a substantial increase of the ω width in the medium, reaching a value of 129 ± 10 MeV at normal nuclear matter density for an ω at rest, which comes mainly from ωN → ππN, ωN N → πN N processes associated to the dominant ω → ρπ decay mode. The value of the width increases moderately with momentum, reaching values of around 200 MeV at 600 MeV/c.

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Section: Introductionsupporting

confidence: 85%

The width of the ω meson in the nuclear medium

Ramos

Tolós

Molina³

et al. 2013

Eur. Phys. J. A

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show abstract

“…The ω meson has also been studied at finite temperature and density within the Walecka model [29,30] obtaining a decrease in mass and an increase in width. Similar conclusions were made in [31] using a many body approach.…”

Section: Introductionsupporting

confidence: 77%

Analysis of ω self-energy at finite temperature and density in the real-time formalism

Ghosh

Sarkar

2013

Eur. Phys. J. A

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Using the real time formalism of field theory at finite temperature and density we have evaluated the in-medium ω self-energy from baryon and meson loops. We have analyzed in detail the discontinuities across the branch cuts of the self-energy function and obtained the imaginary part from the non-vanishing contributions in the cut regions. An extensive set of resonances have been considered in the baryon loops. Adding the meson loop contribution we obtain the full modified spectral function of the ω meson in a thermal gas of mesons, baryons and anti-baryons in equilibrium for several values of temperature and baryon chemical potential.

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“…The build-up of the chemical potentials (necessary to preserve the experimentally observed hadron ratios throughout the hadronic cooling) therefore facilitates the observation of in-medium effects in the dilepton spectra. A strong broadening of the ρ in hot and dense matter has also been reported in other calculations at finite T and ̺ B [47,48]. The in-medium ρ-spectral function has been rather extensively employed to calculate dilepton spectra in heavyion collisions.…”

Section: ρ Mesonmentioning

confidence: 53%

Dilepton radiation at the CERN super-proton synchrotron

2008

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A quantitative evaluation of dilepton sources in heavy-ion reactions is performed taking into account both thermal and non-thermal production mechanisms. The hadronic thermal emission rate is based on an electromagnetic current-correlation function with a low-mass region (LMR, M 1 GeV) dominated by vector mesons (ρ, ω, φ) and an intermediate-mass region (IMR, 1 GeV ≤ M ≤ 3 GeV) characterized by (the onset of) a multi-meson continuum. A convolution of the emission rates over a thermal fireball expansion results in good agreement with experiment in the low-mass spectra, confirming the predicted broadening of the ρ meson in hadronic matter in connection with the prevalence of baryon-induced medium effects. The absolute magnitude of the LMR excess is mostly controlled by the fireball lifetime, which in turn leads to a consistent explanation of the dilepton excess in the IMR in terms of thermal radiation. The analysis of experimental transversemomentum (qT ) spectra reveals discrepancies with thermal emission for qT 1 GeV in noncentral In-In collisions, which we address by extending our calculations by: (i) a refined treatment of ρ decays at thermal freezeout, (ii) primordially produced ρ's subject to energy-loss, (iii) Drell-Yan annihilation, and (iv) thermal radiation from t-channel meson exchange processes. We investigate the sensitivity of dilepton spectra to the critical temperature and hadro-chemical freezeout of the fireball. The ρ broadening in the LMR turns out to be robust, while in the IMR Quark-Gluon Plasma radiation is moderate unless the critical temperature is rather low.

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Selfconsistent description of vector-mesons in matter

Cited by 29 publications

References 70 publications

The width of the ω meson in the nuclear medium

The width of the ω meson in the nuclear medium

Analysis of ω self-energy at finite temperature and density in the real-time formalism

Dilepton radiation at the CERN super-proton synchrotron

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