Dilepton emission rates from hot hadronic matter

Renk, Thorsten; Mishra, Amruta

doi:10.1103/physrevc.69.054905

Cited by 12 publications

(17 citation statements)

References 72 publications

(121 reference statements)

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“…10 Concerning the values µ v,j , one readily sees that 9 The same conclusion that the best fit of the pion HBT radii is obtained when the temperature of surface emission from a hypersurface with a spacelike normal is significantly higher than the temperature of volume emission is made also in Ref. [35], where SPS data for 158 AGeV central Pb+Pb collisions are analyzed.…”

Section: Resultssupporting

confidence: 59%

“…The phase-space 11 The conclusion that a long-lived fireball can be compatible with HBT measurements is made also in Ref. [35] 12 An independence of R side on transport opacity was also found in a covariant transport model [18]. distribution of particles emitted from the surface prior to the fireball breakup is similar to the local chemical equilibrium distribution with parameters rather close to the ones found at chemical freeze-out in RHIC Au+Au collisions.…”

Section: Discussionmentioning

confidence: 55%

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Hydrodynamic source with continuous emission in Au+Au collisions ats=200GeV

et al. 2006

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We analyze single particle momentum spectra and interferometry radii in central Au+Au collisions at RHIC within a hydro-inspired parametrization accounting for continuous hadron emission through the whole lifetime of hydrodynamically expanding fireball. We found that a satisfactory description of the data is achieved for a physically reasonable set of parameters when the emission from non space-like sectors of the enclosed freeze-out hypersurface is fairly long: 9 fm/c. This protracted surface emission is compensated in outward interferometry radii by positive r out − t correlations that are the result of an intensive transverse expansion. The main features of the experimental data are reproduced: in particular, the obtained ratio of the outward to sideward interferometry radii is less than unity and decreases with increasing transverse momenta of pion pairs. The extracted value of the temperature of emission from the surface of hydrodynamic tube approximately coincides with one found at chemical freeze-out in RHIC Au+Au collisions. A significant contribution of the surface emission to the spectra and to the correlation functions at relatively large transverse momenta should be taken into account in advanced hydrodynamic models of ultrarelativistic nucleus-nucleus collisions.

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Section: Resultssupporting

confidence: 59%

Section: Discussionmentioning

confidence: 55%

Hydrodynamic source with continuous emission in Au+Au collisions ats=200GeV

et al. 2006

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“…(This was pointed out also in refs. [17][18][19][20].) From our solutions we have (for a broad but finite rapidity distribution, where the saddle-point approximation is valid):…”

Section: Life-time Estimationmentioning

confidence: 99%

Detailed description of accelerating, simple solutions of relativistic perfect fluid hydrodynamics

2008

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In this paper we describe in full details a new family of recently found exact solutions of relativistic, perfect fluid dynamics. With an ansatz, which generalizes the well-known Hwa-Bjorken solution, we obtain a wide class of new exact, explicit and simple solutions, which have a remarkable advantage as compared to presently known exact and explicit solutions: they do not lack acceleration. They can be utilized for the description of the evolution of the matter created in high energy heavy ion collisions. Because these solutions are accelerating, they provide a more realistic picture than the well-known Hwa-Bjorken solution, and give more insight into the dynamics of the matter. We exploit this by giving an advanced simple estimation of the initial energy density of the produced matter in high energy collisions, which takes acceleration effects (i.e. the work done by the pressure and the modified change of the volume elements) into account. We also give an advanced estimation of the life-time of the reaction. Our new solutions can also be used to test numerical hydrodynamical codes reliably. In the end, we also give an exact, 1+1 dimensional, relativistic hydrodynamical solution, where the initial pressure and velocity profile is arbitrary, and we show that this general solution is stable for perturbations.

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“…The results at √ s N N = 130 GeV also were consistent with a monotonic increase of R ℓ from AGS energies ( √ s N N ≃ 2-5 GeV), while R o and R s remained roughly constant. It should be noted that it is possible to fit the experimental data at RHIC to a variety of ansätze [14,15,16], but the interpretation remains an open question. The wealth of HBT data over a large number of variables and their experimentally-determined systematic dependencies continue to create new challenges for theorists and add yet more pieces to the "HBT puzzle".…”

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confidence: 99%

Transverse momentum and rapidity dependence of Hanbury-Brown–Twiss correlations in Au+Au collisions atsNN=62.4 and 200 GeV

et al. 2006

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Two-particle correlations of identical charged pion pairs from Au+Au collisions at√ s N N = 62.4and 200 GeV were measured by the PHOBOS experiment at RHIC. Data for the 15% most central events were analyzed with Bertsch-Pratt and Yano-Koonin-Podgoretskii parameterizations using pairs with rapidities of 0.4 < yππ < 1.3 and transverse momenta 0.1 < kT < 1.4 GeV/c. The Bertsch-Pratt radii Ro and R ℓ decrease as a function of pair transverse momentum, while Rs is consistent with a weaker dependence. Ro and Rs are independent of collision energy, while R ℓ shows a slight increase. The source rapidity y YKP scales roughly with the pair rapidity yππ, indicating strong dynamical correlations. Recent experimental results from all four experiments at the Relativistic Heavy Ion Collider (RHIC) have concluded that Au+Au collisions at the top RHIC energy ( √ s N N = 200 GeV) have produced an extremely hot and dense state of matter [1, 2,3,4]. This matter may have degrees of freedom that are purely hadronic ("hadronic gas"), purely partonic ("Quark-Gluon Plasma", QGP), or an admixture of both. Identical-particle correlation measurements (Hanbury-Brown and Twiss, HBT) yield valuable information on the size, shape, duration, and spatiotemporal evolution of the emission source. Because the dynamics of a hadron gas and a QGP are naïvely expected to be quite different, HBT may allow us to discriminate between these three scenarios [5,6].Experimentally, the correlation function C(q) is defined aswhere p 1 and p 2 are the particle four-momenta, P (p 1 , p 2 ) is the probability of a pair being measured with relative four-momentum q = p 1 − p 2 , and P (p 1 ) and P (p 2 ) are the single-particle probabilities. The numerator is determined directly from data, while the denominator is constructed using a standard event-mixing technique. C(q) can be fit to the Bertsch-Pratt parameterization of a Gaussian source in three dimensions [6,7,8],where q ℓ is the component of q along the beam direction; q o is the component along the pair transverse momentum k T = 1 2 ( p T 1 + p T 2 ); and q s is the component orthogonal to the other two. The q o q ℓ cross-term vanishes only for symmetric collisions with acceptances centered around midrapidity. The λ parameter represents the correlation strength and is expected to be unity for a completely incoherent source. According to the definitions of q o and q s , R o probes a mixture of the spatial and temporal extent of the source, while R s measures only the spatial component. In the special case of a boost-invariant, transparent, azimuthally symmetric source, the ratio R o /R s may be a good indicator of the duration of the emission of particles from the source. Predictions for this quantity from hydrodynamic and transport models varied by over an order of magnitude [9,10], but mostly focused on values between 1.5-2.0, while the first results from RHIC at

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Dilepton emission rates from hot hadronic matter

Cited by 12 publications

References 72 publications

Hydrodynamic source with continuous emission in Au+Au collisions ats=200GeV

Hydrodynamic source with continuous emission in Au+Au collisions ats=200GeV

Detailed description of accelerating, simple solutions of relativistic perfect fluid hydrodynamics

Transverse momentum and rapidity dependence of Hanbury-Brown–Twiss correlations in Au+Au collisions atsNN=62.4 and 200 GeV

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