Observation of Direct Photons in Central<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>158</mml:mn><mml:mi mathvariant="italic">A</mml:mi></mml:math>GeV<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>P</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>208</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>b</mml:m

We analyze the photon rates from a hadronic gas in equilibrium using chiral reduction formulas and a density expansion. The chiral reduction is carried to second order in the pion density which in principal includes all kinetic processes of the type $X\to \pi\gamma$ and $X\to \pi\pi\gamma$. The resulting rates are encoded in the form of vacuum correlation functions which are amenable to experiment. The hadronic rates computed in this work along with the known perturbative QGP rates are integrated over the space-time evolution of a hydrodynamic model tuned to hadronic observables. The resulting yields are compared to the recent photon and low mass dilepton measurements at the SPS and RHIC. Predictions for the LHC are made

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“…[29,30]. In this case, upper limits could be obtained for photon momentum in the range 0.5 q ⊥ 1.5 and data points obtained above 1.5 GeV.…”

Section: A Sps: Photons At Wa98mentioning

confidence: 72%

Thermal photons from heavy ion collisions: A spectral function approach

Dusling

Zahed

2010

Phys. Rev. C

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“…From an analysis of the spectrum of neutral pions, the temperature was estimated to be T 160GeV ≈ 0.185GeV [26]. We take σ inel HI ≈ 6.3b, the minimum-bias cross section for the experiment [27].…”

Section: Arxiv:170507052v2 [Hep-ph] 13 Oct 2017mentioning

confidence: 99%

Magnetic Monopole Mass Bounds from Heavy-Ion Collisions and Neutron Stars

Gould

Rajantie

2017

Phys. Rev. Lett.

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Magnetic monopoles, if they exist, would be produced amply in strong magnetic fields and high temperatures via the thermal Schwinger process. Such circumstances arise in heavy-ion collisions and in neutron stars, both of which imply lower bounds on the mass of possible magnetic monopoles. In showing this, we construct the cross section for pair production of magnetic monopoles in heavy-ion collisions, which indicates that they are particularly promising for experimental searches such as MoEDAL.

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“…An accurate measurement of π 0 and heavier hadrons provides the necessary input to subtract the decay background. This method has been successfully used in heavy-ion reactions [56,57]; however, it does not provide event-by-event direct photon identification.…”

Section: Direct Photon Analysismentioning

confidence: 99%

Inclusiveπ0,η, and direct photon production at high transverse momentum inp+p
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C
Self Cite
39
3
13
0
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We report a measurement of high-p T inclusive π 0 , η, and direct photon production in p + p and d + Au collisions at √ s NN = 200 GeV at midrapidity (0 < η < 1). Photons from the decay π 0 → γ γ were detected in the barrel electromagnetic calorimeter of the STAR experiment at the Relativistic Heavy Ion Collider. The η → γ γ decay was also observed and constituted the first η measurement by STAR. The first direct photon cross-section measurement by STAR is also presented; the signal was extracted statistically by subtracting the π 0 , η, and ω(782) decay background from the inclusive photon distribution observed in the calorimeter. The analysis is described in detail, and the results are found to be in good agreement with earlier measurements and with next-to-leading-order perturbative QCD calculations.

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Observation of Direct Photons in Central158AGeVP208b

Cited by 185 publications

References 27 publications

Thermal photons from heavy ion collisions: A spectral function approach

Thermal photons from heavy ion collisions: A spectral function approach

Magnetic Monopole Mass Bounds from Heavy-Ion Collisions and Neutron Stars

Inclusiveπ0,η, and direct photon production at high transverse momentum inp+p
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C
Self Cite
39
3
13
0
View full text Add to dashboard Cite

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Observation of Direct Photons in Central158AGeVP208b

Cited by 185 publications

References 27 publications

Thermal photons from heavy ion collisions: A spectral function approach

Thermal photons from heavy ion collisions: A spectral function approach

Magnetic Monopole Mass Bounds from Heavy-Ion Collisions and Neutron Stars

Inclusiveπ0,η, and direct photon production at high transverse momentum inp+pAbelev1, Aggarwal2, Ahammed3 et al. 2010Phys. Rev. CSelf Cite393130View full textAdd to dashboardCite

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About

Inclusiveπ0,η, and direct photon production at high transverse momentum inp+p
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C
Self Cite
39
3
13
0
View full text Add to dashboard Cite