Light vector mesons

Milov, A.

doi:10.1140/epjc/s10052-009-0915-4

Cited by 4 publications

(5 citation statements)

References 42 publications

(35 reference statements)

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“…However we have observed a different trend (i.e. a smaller suppression) for strange particles and η has a strangeness content too [69,70]. Therefore, since the η cannot be measured at low-p T , we take as systematic uncertainty in the low-p T region (and consequently on the extrapolated dN/dy), the difference of the two spec- tra (∼ 30%) in the low-p T range.…”

Section: Cocktail Of Hadronic Sourcesmentioning

confidence: 86%

Detailed measurement of the e+e- pair continuum in p+p and Au+Au collisions at sqrt(s_NN)=200 GeV and implications for direct photon production

Adare

2009

Preprint

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PHENIX has measured the e + e − pair continuum in √ sNN =200 GeV Au + Au and p+p collisions over a wide range of mass and transverse momenta. The e + e − yield is compared to the expectations from hadronic sources, based on PHENIX measurements. In the intermediate-mass region, between the masses of the φ and the J/ψ meson, the yield is consistent with expectations from correlated cc production, although other mechanisms are not ruled out. In the low mass region, below the φ, the p + p inclusive mass spectrum is well described by known contributions from light meson decays. In contrast, the Au + Au minimum bias inclusive mass spectrum in this region shows an enhancement by a factor of 4.7 ± 0.4 stat ± 1.5 syst ± 0.9 model . At low mass (mee < 0.3 GeV/c 2 ) and high pT (1 < pT <5 GeV/c) an enhanced e + e − pair yield is observed that is consistent with production of virtual direct photons. This excess is used to infer the yield of real direct photons. In central Au + Au collisions, the excess of the direct photon yield over the p + p is exponential in pT , with inverse slope T = 221 ± 19 stat ± 19 syst MeV. Hydrodynamical models with initial temperatures ranging from Tinit ≃ 300-600 MeV at times of 0.6-0.15 fm/c after the collision are in qualitative agreement with the direct photon data in Au + Au. For low pT < 1 GeV/c the low-mass region shows a further significant enhancement that increases with centrality and has an inverse slope of T ≃ 100 MeV. Theoretical models under predict the low-mass, low-pT enhancement.

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Section: Cocktail Of Hadronic Sourcesmentioning

confidence: 86%

Detailed measurement of the e+e- pair continuum in p+p and Au+Au collisions at sqrt(s_NN)=200 GeV and implications for direct photon production

Adare

2009

Preprint

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“…Particularly important are the vector mesons, for which there is now evidence from both theory [36,46,47] and experiment [48,49] that the masses may decrease by approximately 10 − 15% at normal nuclear matter density and zero temperature. It should be pointed out that, as reviewed recently by Hayano and Hatsuda [50] and Milov [51], there are also experiments which do not support the above in-medium decrease (or drop) of the meson mass. However, there are more experiments that support the in-medium decrease of meson masses as compared to experiments which do not see such evidence.…”

Section: Formalismmentioning

confidence: 91%

“…However, there are more experiments that support the in-medium decrease of meson masses as compared to experiments which do not see such evidence. [51] Densitydependent nuclear interactions obtained by applying the above scaling to the light mesons (ω, ρ and σ) which mediate the NN potential have been employed in studying the properties of nuclear matter [30,31,37,38] and the 14 C → 14 N β-decay [39]. We are interested in the EOS and E sym up to densities as high as ρ ≃ 5ρ 0 , and at such high densities the above linear scaling is clearly not suitable.…”

Section: Formalismmentioning

confidence: 99%

Low-momentum interactions with Brown-Rho-Ericson scalings, and the density dependence of the nuclear symmetry energy

2011

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We have calculated the nuclear symmetry energy Esym(ρ) up to densities of 4 ∼ 5ρ0 with the effects from the Brown-Rho (BR) and Ericson scalings for the in-medium mesons included. Using the V low−k low-momentum interaction with and without such scalings, the equations of state (EOS) of symmetric and asymmetric nuclear matter have been calculated using a ring-diagarm formalism where the particle-particle-hole-hole ring diagrams are included to all orders. The EOS for symmetric nuclear matter and neutron matter obtained with linear BR scaling are both overly stiff compared with the empirical constraints of Danielewicz et al. [9]. In contrast, satisfactory results are obtained by either using the non-linear Ericson scaling or by adding a Skyrme-type three-nucleon force (TNF) to the unscaled V low−k interaction. Our results for Esym(ρ) obtained with the non-linear Ericson scaling are in good agreement with the empirical values of Tsang et al. [7] and Li et al. [10], while those with TNF are slightly below these values. For densities below the nuclear saturation density ρ0, the results of the above calculations are nearly equivalent to each other and all in satisfactory agreement with the empirical values.

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“…* (y, p T ), obtained * (892) 0 , as well as the p T dependence of m K * and K * (see Figs 6,7,5). 0 < p T < 1.5 GeV/c…”

mentioning

confidence: 95%

“…Resonance production is believed to be an important tool to study the dynamics of high-energy collisions. In dense systems created in heavy nucleus-nucleus collisions, the properties of some of them (widths, masses, branching ratios) were predicted to be modified due to partial restoration of chiral symmetry [2][3][4][5]. The transverse mass spectra and yields of resonances are also important inputs for Blast-Wave (BW) models (determining kinetic/thermal freeze-out temperature and transverse flow velocity; see for example Ref.…”

Section: Introductionmentioning

confidence: 99%

$$K^{*}(892)^0$$ meson production in inelastic p+p interactions at 40 and 80 $$\text{ GeV }\!/\!c$$ beam momenta measured by NA61/SHINE at the CERN SPS

et al. 2022

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Measurements of $$K^{*}(892)^0$$ K ∗ ( 892 ) 0 resonance production via its $$K^{+}\pi ^{-}$$ K + π - decay mode in inelastic p+p collisions at beam momenta 40 and 80 $$\text{ GeV }\!/\!c$$ GeV / c ($$\sqrt{s_{NN}}=8.8$$ s NN = 8.8 and 12.3 $$\text{ GeV }$$ GeV ) are presented. The data were recorded by the NA61/SHINE hadron spectrometer at the CERN Super Proton Synchrotron. The template method was used to extract the $$K^{*}(892)^0$$ K ∗ ( 892 ) 0 signal. Transverse momentum and rapidity spectra were obtained. The mean multiplicities of $$K^{*}(892)^0$$ K ∗ ( 892 ) 0 mesons were found to be $$(35.1 \pm 1.3 \mathrm {(stat)} \pm 3.6 \mathrm {(sys))} \cdot 10^{-3}$$ ( 35.1 ± 1.3 ( stat ) ± 3.6 ( sys ) ) · 10 - 3 at 40 $$\text{ GeV }\!/\!c$$ GeV / c and $$(58.3 \pm 1.9 \mathrm {(stat)} \pm 4.9 \mathrm {(sys))} \cdot 10^{-3}$$ ( 58.3 ± 1.9 ( stat ) ± 4.9 ( sys ) ) · 10 - 3 at 80 $$\text{ GeV }\!/\!c$$ GeV / c . The NA61/SHINE results are compared with the Epos1.99 and Hadron Resonance Gas models as well as with world data. The transverse mass spectra of $$K^{*}(892)^0$$ K ∗ ( 892 ) 0 mesons and other particles previously reported by NA61/SHINE were fitted within the Blast-Wave model. The transverse flow velocities are close to 0.1–0.2 of the speed of light and are significantly smaller than the ones determined in heavy nucleus-nucleus interactions at the same beam momenta.

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Light vector mesons

Cited by 4 publications

References 42 publications

Detailed measurement of the e+e- pair continuum in p+p and Au+Au collisions at sqrt(s_NN)=200 GeV and implications for direct photon production

Detailed measurement of the e+e- pair continuum in p+p and Au+Au collisions at sqrt(s_NN)=200 GeV and implications for direct photon production

Low-momentum interactions with Brown-Rho-Ericson scalings, and the density dependence of the nuclear symmetry energy

$$K^{*}(892)^0$$ meson production in inelastic p+p interactions at 40 and 80 $$\text{ GeV }\!/\!c$$ beam momenta measured by NA61/SHINE at the CERN SPS

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