High-energy photons from expanding quark-gluon plasma and hot hadronic matter

Journal Article · Sun Nov 01 04:00:00 EST 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.46.3802· OSTI ID:7072662

Chakrabarty, S; Alam, J; Srivastava, D K; Sinha, B ^[1]; Raha, S ^[2]

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1. Variable Energy Cyclotron Centre, 1/AF Bidhan Nagar, Calcutta 700064 (India)
2. Bose Institute, 93/1 Acharya Prafulla Chandra Road, Calcutta 700009 (India)

The emission of high-energy photons from an expanding quark-gluon plasma (QGP), which undergoes a first-order phase transition to a hot hadronic gas before freeze-out, is evaluated. Compton and annihilation processes in the quark-gluon plasma and an exhaustive array of {ital hh}{r arrow}{ital h}{gamma} reactions as wel l as decays in hot hadronic matter are considered. We find that, if the initial temperature of the QGP is more than twice the critical temperature, then, beyond a transverse momentum of about 2--3 GeV, the photons from the QGP outshine those having their origin in hadronic matter. We further note that the increase in degrees of freedom in the hot hadronic matter reduces the lifetime of the mixed phase.

• OSTI ID: 7072662
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 46:9; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662230 -- Quantum Chromodynamics-- (1992-)
662390* -- Electromagnetic Processes & Properties-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BASIC INTERACTIONS
BOSONS
COMPTON EFFECT
CROSS SECTIONS
DECAY
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
EMISSION
ENERGY RANGE
EQUATIONS
EQUATIONS OF STATE
FIELD THEORIES
HADRONS
INTERACTIONS
LINEAR MOMENTUM
MATTER
MESONS
MEV RANGE
MEV RANGE 100-1000
MOMENTUM TRANSFER
PARTICLE DECAY
PARTICLE INTERACTIONS
PHASE TRANSFORMATIONS
PHOTON EMISSION
PIONS
PIONS MINUS
PIONS NEUTRAL
PIONS PLUS
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MATTER
QUARK-ANTIQUARK INTERACTIONS
RADIATIVE DECAY
SCATTERING
SPACE-TIME
TRANSVERSE MOMENTUM