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Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions

Adare, A. (author)
University of Colorado
Christiansen, Peter (author)
Lund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Gustafsson, Hans-Åke (author)
Lund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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Haslum, Eva (author)
Lund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Nystrand, Joakim (author)
Lund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Oskarsson, Anders (author)
Lund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Otterlund, Ingvar (author)
Lund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Rosendahl, Sarah (author)
Lund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Silvermyr, David (author)
Lund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Stenlund, Evert (author)
Lund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Tydesjö, Henrik (author)
Lund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Zou, L. (author)
University of California, Riverside
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 (creator_code:org_t)
 
2019
2019
English.
In: Physical Review Letters. - 1079-7114. ; 123:2
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • The PHENIX collaboration presents first measurements of low-momentum (0.41 GeV/c) direct-photon yield dNγdir/dη is a smooth function of dNch/dη and can be well described as proportional to (dNch/dη)α with α≈1.25. This scaling behavior holds for a wide range of beam energies at the Relativistic Heavy Ion Collider and the Large Hadron Collider, for centrality selected samples, as well as for different A+A collision systems. At a given beam energy, the scaling also holds for high pT (>5 GeV/c), but when results from different collision energies are compared, an additional sNN-dependent multiplicative factor is needed to describe the integrated-direct-photon yield. © 2019 authors. Published by the American Physical Society.

Subject headings

NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

Keyword

Heavy ions
Photons
Au+Au collisions
Collision energies
Collision systems
Large Hadron Collider
Multiplicative factors
Relativistic Heavy Ion Collider
Scaling behavior
Ultrarelativistic heavy ion collision
Colliding beam accelerators

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art (subject category)
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