Intensity interferometry of thermal photons from relativistic heavy-ion collisions

Srivastava, D. K.

doi:10.1103/physrevc.71.034905

Cited by 22 publications

(11 citation statements)

References 64 publications

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“…We do not include here additional ππ Bremsstrahlung contributions (ππ → ππγ) as evaluated in Refs. [24,25]. This source is important at low momenta, q t 0.5 GeV, put plays no role in the region of interest of the present investigation (q t ≥ 1 GeV).…”

Section: A Thermal Emissionmentioning

confidence: 88%

Thermal photons and collective flow at energies available at the BNL Relativistic Heavy-Ion Collider

2011

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We update our calculations of thermal-photon production in nuclear collisions at the Relativistic Heavy-Ion Collider (RHIC). Specifically, we address the recent experimental observation of an elliptic flow of direct photons comparable in magnitude to that of pions, which is at variance with expectations based on quark-gluon plasma (QGP) dominated photon radiation. Our thermal emission rate is based on previous work, i.e., resummed leading-order QGP emission and in-medium hadronic rates in the confined phase. These rates are nearly degenerate at temperatures close to the expected QCD-phase change. The rates are convoluted over an improved elliptic-fireball expansion with transverse-and elliptic-flow fields quantitatively constrained by empirical light-and strangehadron spectra. The resulting direct-photon spectra in central Au-Au collisions are characterized by hadron-dominated emission up to transverse momenta of ∼ 2-3 GeV. The associated large elliptic flow in the hadronic phase mitigates the discrepancy with the measured photon-v2 compared to scenarios with QGP-dominated emission.

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Section: A Thermal Emissionmentioning

confidence: 88%

Thermal photons and collective flow at energies available at the BNL Relativistic Heavy-Ion Collider

2011

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“…[1,2,3,4,5] for recent reviews. While scattering in deconfined matter is expected to mostly manifest itself in the photon spectra at transverse momenta above q t ≃ 2 GeV, the hadronic stages are likely to dominate the emission at low q t [6,7,8,9,10,11,12,13]. The latter regime has recently received renewed interest due to measurements of the WA98 collaboration in central P b-P b collisions at the CERN Super Proton Synchrotron (SPS) [14,15].…”

Section: Introductionmentioning

confidence: 99%

Low-energy thermal photons from meson–meson bremsstrahlung

Liu

Rapp

2007

Nuclear Physics A

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Within an effective hadronic model including electromagnetic interactions via a U em (1) gauge, we reinvestigate photon bremsstrahlung from a hot hadronic gas as expected to be formed in relativistic heavy-ion collisions at SPS energies. We calculate photon emission from the reactions ππ → ππγ and πK → πKγ by an explicit (numerical) evaluation of the multi-dimensional phase space integral. This, in particular, allows to avoid the commonly employed soft photon approximation (SPA), as well as to incorporate finalstate thermal enhancement factors. Both improvements are shown to result in an appreciable increase of the photon production rate over previous hadronic calculations. Upon convolution over a thermal fireball we find an improvement in the description of recent low transverse-momentum WA98 data at SPS. The influence of both Landau-Pomeranchuk-Migdal and in-medium effects on "σ " and ρ-meson exchanges are briefly discussed.

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“…Thus the model results show that rotation significantly influences the HBT evaluation similarly like the expansion, which influences data significantly, e.g. in publications [21][22][23][24][25].…”

Section: Resultsmentioning

confidence: 99%

Interferometry for rotating sources

2016

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The two particle interferometry method to determine the size of the emitting source after a heavy ion collision is extended. Following the extension of the method to spherical expansion dynamics, here we extend the method to rotating systems. It is shown that rotation of a cylindrically symmetric system leads to modifications, which can be perceived as spatial asymmetry by the "azimuthal HBT" method. We study an exact rotating and expanding solution of the fluid dynamical model of heavy ion reactions. We consider a source that is azimuthally symmetric in space around the axis of rotation, and discuss the features of the resulting two particle correlation function. This shows the azimuthal asymmetry arising from the rotation. We show that this asymmetry leads to results similar to those given by spatially asymmetric sources.Comment: 3 pages, 3 figures, submitted to PLB. arXiv admin note: text overlap with arXiv:1508.0188

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Intensity interferometry of thermal photons from relativistic heavy-ion collisions

Cited by 22 publications

References 64 publications

Thermal photons and collective flow at energies available at the BNL Relativistic Heavy-Ion Collider

Thermal photons and collective flow at energies available at the BNL Relativistic Heavy-Ion Collider

Low-energy thermal photons from meson–meson bremsstrahlung

Interferometry for rotating sources

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