Vector mesons in medium and dileptons in heavy-ion collisions

Rapp, Ralf; Wambach, J.

doi:10.1016/b978-044450539-2/50003-6

Cited by 428 publications

(807 citation statements)

References 33 publications

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“…Among these, the ρ(770 MeV/c 2 ) is the most important, due to its strong coupling to the ππ channel and its short lifetime of only 1.3 fm/c. Changes both in width and in mass were originally suggested as precursor signatures of the chiral transition [1] and subsequent models have tied these changes directly [2] or indirectly [3] to chiral symmetry restoration.…”

Section: Introductionmentioning

confidence: 99%

NA60 results onp_Tspectra and the ρ spectral function in In–In collisions

Seixas

Arnaldi

Averbeck

et al. 2007

J. Phys. G: Nucl. Part. Phys.

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Abstract. The NA60 experiment at the CERN SPS has studied low-mass muon pairs in 158 AGeV In-In collisions. A strong excess of pairs is observed above the yield expected from neutral meson decays. The unprecedented sample size of close to 400K events and the good mass resolution of about 2% have made it possible to isolate the excess by subtraction of the decay sources (keeping the ρ). The shape of the resulting mass spectrum exhibits considerable broadening, but essentially no shift in mass. The acceptance-corrected transverse-momentum spectra have a shape atypical for radial flow and show a significant mass dependence, pointing to different sources in different mass regions.

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Section: Introductionmentioning

confidence: 99%

NA60 results onp_Tspectra and the ρ spectral function in In–In collisions

Seixas

Arnaldi

Averbeck

et al. 2007

J. Phys. G: Nucl. Part. Phys.

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“…In the low invariant mass region which is dominated by lepton pairs produced during the later stages of the collision, dilepton emission takes place due to the decay of vector mesons. Consequently, the spectral properties of vector mesons, the ρ meson in particular has been a subject of intense discussion [7,4,2,8]. We find that it is only for the π − π loop that one calculates the thermal self-energy loop for the vector mesons directly.…”

Section: Introductionmentioning

confidence: 91%

In-medium vector mesons and low mass lepton pairs from heavy ion collisions

Sarkar

Ghosh

2012

J. Phys.: Conf. Ser.

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Abstract.The ρ and ω meson self-energy at finite temperature and baryon density have been analysed for an exhaustive set of mesonic and baryonic loops in the real time formulation of thermal field theory. The large enhancement of spectral strength below the nominal ρ mass is seen to cause a substantial enhancement in dilepton pair yield in this mass region. The integrated yield after space-time evolution using relativistic hydrodynamics with quark gluon plasma in the initial state leads to a very good agreement with the experimental data from In-In collisions obtained by the NA60 collaboration. IntroductionColliding heavy ions at ultra-relativistic energies is the only way to produce and study bulk properties of strongly interacting matter. Systematic efforts, both theoretical and experimental over the last few decades [1,2] have addressed various facets of the thermodynamics of the underlying theory − QCD. The spectra of hadrons emitted after freeze-out of the fireball produced in heavy ion collisions have provided us with a wealth of information. This includes the recent discovery made by studying the elliptic flow of hadrons that the quark gluon plasma (QGP) produced in Au+Au collisions at RHIC actually behaves as a strongly interacting fluid [3] as opposed to a asymptotically free gas of quarks and gluons. However, by virtue of the fact that electromagnetic probes (real photons and dileptons) are emitted all through the lifetime of the fireball coupled with their low rescattering probability make them penetrating probes capable of mapping the space-time history of the collision [4]. Lepton pairs with both invariant mass and transverse momentum information are in fact preferable to real photons. Large mass pairs produced by Drell-Yan process and from the decays of heavy quarkonia are emitted early whereas pairs with low invariant mass radiated from thermal hadronic matter and Dalitz decays of hadrons are produced late in the collision. The invariant mass spectra of dileptons thus carry time information as displayed explicitly in [5] using the invariant mass dependence of the elliptic flow of lepton pairs.The rate of production of thermal dileptons is proportional to the two-point correlator of vector currents [6]. In the low invariant mass region which is dominated by lepton pairs produced during the later stages of the collision, dilepton emission takes place due to the decay of vector mesons. Consequently, the spectral properties of vector mesons, the ρ meson in particular has been a subject of intense discussion [7,4,2,8]. We find that it is only for the π − π loop that

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“…Especially their decay to dileptons is presently investigated in elementary and complex (nucleus-nucleus) collisions in different laboratories all over the world (cf. the reviews [1,2,3] and Refs. therein).…”

Section: Introductionmentioning

confidence: 99%

Production of a0 mesons in pp and pn reactions

Bratkovskaya

Grishina

Kondratyuk

et al. 2002

J. Phys. G: Nucl. Part. Phys.

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Abstract. We investigate the cross section for the reaction N N → N N a 0 near threshold and at medium energies. An effective Lagrangian approach with one-pion exchange is applied to analyze different contributions to the cross section for different isospin channels. The Reggeon exchange mechanism is also considered. The results are used to calculate the contribution of the a 0 meson to the cross sections and invariant KK mass distributions of the reactions pp → pnK +K 0 and pp → ppK + K − . It is found that the experimental observation of a + 0 mesons in the reaction pp → pnK +K 0 is much more promising than the observation of a 0 0 mesons in the reaction pp → ppK + K − . PACS

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Vector mesons in medium and dileptons in heavy-ion collisions

Cited by 428 publications

References 33 publications

NA60 results onp_Tspectra and the ρ spectral function in In–In collisions

NA60 results onp_Tspectra and the ρ spectral function in In–In collisions

In-medium vector mesons and low mass lepton pairs from heavy ion collisions

Production of a0 mesons in pp and pn reactions

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Vector mesons in medium and dileptons in heavy-ion collisions

Cited by 428 publications

References 33 publications

NA60 results onpTspectra and the ρ spectral function in In–In collisions

NA60 results onpTspectra and the ρ spectral function in In–In collisions

In-medium vector mesons and low mass lepton pairs from heavy ion collisions

Production of a0 mesons in pp and pn reactions

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Product

Resources

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NA60 results onp_Tspectra and the ρ spectral function in In–In collisions

NA60 results onp_Tspectra and the ρ spectral function in In–In collisions