On the manifestation of chiral symmetry in nuclei and dense nuclear matter

Brown, G. E.; Rho, Mannque

doi:10.1016/s0370-1573(01)00084-9

Cited by 198 publications

(169 citation statements)

References 60 publications

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“…Note that at AGS (Si+Au) the nominal masses are preferred [1]. It was argued [33,34] that changes of masses in-medium in connection to chiral symmetry restoration can lead to larger values of the chemical potentials at lower energies.…”

Section: Model Descriptionmentioning

confidence: 99%

Hadron production in central nucleus–nucleus collisions at chemical freeze-out

2006

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We analyze the experimental hadron yield ratios for central nucleus-nucleus collisions in terms of thermal model calculations over a broad energy range, √ s N N =2.7-200 GeV. The fits of the experimental data with the model calculations provide the thermal parameters, temperature and baryo-chemical potential at chemical freezeout. We compare our results with the values obtained in other studies and also investigate more technical aspects such as a potential bias in the fits when fitting particle ratios or yields. Using parametrizations of the temperature and baryonic chemical potential as a function of energy, we compare the model calculations with data for a large variety of hadron yield ratios. We provide quantitative predictions for experiments at LHC energy, as well as for the low RHIC energy of 62.4 GeV. The relation of the determined parameters with the QCD phase boundary is discussed.

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Section: Model Descriptionmentioning

confidence: 99%

Hadron production in central nucleus–nucleus collisions at chemical freeze-out

2006

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“…Thus applying the same EFT technique will provide a useful check of the validity of EFT* as a bona-fide EFT of QCD as discussed in Ref. [7,12].…”

Section: Discussionmentioning

confidence: 99%

EFT for electroweak processes of light nuclei

Park

2004

Nuclear Physics A

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Recently we succeeded to make a reliable EFT prediction in a totally parameter-free manner for the S factors for the solar pp and hep processes, p + p → d + e + + ν e and 3 He + p → 4 He + e + + ν e [1]. The strategy used in there is to embed a highly sophisticated standard nuclear physics approach (SNPA) exploiting realistic potentials [2,3] into an EFT framework, that we refer to as EFT * . Up to next-next-to-leading order in chiral expansion, it turnes out that there is effectively only one counter-term relevant to this process, the coefficient of which -(d R ) -has been renormalized to reproduce the experimental value of the tritium-beta decay. Our study has also led to very accurate EFT calculations on two-body weak processes that also receive contributions from thed R term, µ − d capture rate [4], and ν − d scattering cross section [5].

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“…Instead a signi cant enhancement in the region of the ρ/ω peak relative to the hadronic cocktail has been observed. Two di erent approaches are followed by theory to explain this: the dropping of the ρ vector meson mass in the medium, as for example described in [Hun97,Cas95,Li96,Bro02], or the modi cation of the spectral function in medium, as described in [Bra98, Rap00, Urb98, Urb00, Rap97, Cha96]. The dropping ρ mass scenario seems to be su cient to explain the spectra presented by CERES, but a modern high statistics experiment (NA60) strongly supports the second scenario of the in-medium modi cation of the spectral function of the ρ meson [Arn06].…”

Section: Dilepton Experimentsmentioning

confidence: 99%

“…The gure on the right compares the excess mass spectra data in the semi-central bin to several model predictions. The thin solid line is the cocktail prediction (sum of known sources) and the dashed dotted line shows calculations from the inmedium moving ρ meson mass model [Bro02,Bro91,Li95], and the in medium broadening model prediction as in [Cha96,Rap00,Rap97] is given by the thick solid line. The actual data points are given by the solid triangles with error bars.…”

Section: Dilepton Experimentsmentioning

confidence: 99%

“…This lead to several new theoretical models to explain these results, like the dropping of the ρ vector meson mass in medium [Hun97,Cas95,Li96,Bro02], or the modi cation of the spectral function in medium [Bra98, Rap00, Urb98, Urb00, Rap97, Cha96]. Recent results of the two current dilepton experiments HADES and NA60 are discussed in Section 1.5 together with their implications for the current models.…”

Section: Introductionmentioning

confidence: 99%

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Level 3 trigger algorithm and Hardware Platform for the HADES experiment

Kirschner

Agakishiev

Liu

et al. 2009

Nuclear Instruments and Methods in Physics Research Section A:

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One focus of the HADES experiment 5 is the investigation of the decay of light vector mesons inside a dense medium into lepton pairs. These decays provide a conceptually ideal tool to study the invariant mass of the vector meson in-medium, since the lepton pairs of these meson decays leave the reaction without further strong interaction. Thus, no nal state interaction a ects the measurement. Unfortunately, the branching ratios of vector mesons into lepton pairs are very small (≈ 10 −5 ). This calls for a high rate, high acceptance experiment. In addition, a sophisticated real time trigger system is used in HADES to enrich the interesting events in the recorded data.The focus of this thesis is the development of a next generation real time trigger method to improve the enrichment of lepton events in the HADES trigger. In addition, a exible hardware platform (GE-MN) was developed to implement and test the trigger method.The GE-MN features two Gigabit-Ethernet interfaces for data transport, a VMEbus for slow control and con guration, and a TigerSHARC DSP for data processing. It provides the experience to discuss the challenges and bene ts of using a commercial standard network technology based system in an experiment. It is demonstrated that the use of the correlation method can enhance the number of events which contain leptons by an experiment dependent factor. The possible enhancements of different reactions are ≈ 30 for p+p, ≈ 50 for C+C and ≈ 5, 5 for Ar+KCl. The e ciency at these enhancements is above 80 %, and it is constant in relation to the parameters polar angle, azimuthal angle and momentum. It is demonstrated how to obtain the correlation parameters from the online available raw data only.

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On the manifestation of chiral symmetry in nuclei and dense nuclear matter

Cited by 198 publications

References 60 publications

Hadron production in central nucleus–nucleus collisions at chemical freeze-out

Hadron production in central nucleus–nucleus collisions at chemical freeze-out

EFT for electroweak processes of light nuclei

Level 3 trigger algorithm and Hardware Platform for the HADES experiment

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