Features of photons radiated off quarks escaping from a quark-gluon plasma
- Variable Energy Cyclotron Centre, 1/AF Bidhan Nagar, Calcutta 700 064 (India)
Radiation of photons off quarks escaping from a quark-gluon plasma and thereby accelerated by the confining color field is studied. The rate of emission of these photons is found to increase with their rapidity for a given energy. The {ital p}{sub {ital T}} spectrum of the photons thus radiated is compared to those due to the Compton and annihilation processes in the quark-gluon plasma (QGP) after accounting for the space-time evolution of the plasma. The largest contributions are seen if the current mass for the quarks is used and then the photons produced due to the color-confining mechanism operating on the quarks are found to give a contribution of about 100% at very low {ital p}{sub {ital T}} and about 10--20% at the transverse momenta of 2--3 GeV as compared to the photons due to the Compton and annihilation processes in the plasma. However, if a larger value is associated with the mass of the quark, this radiation is very strongly suppressed. This uncertainty raises doubts about the usefulness of such radiations as a signature of a QGP, which is rather unfortunate as these photons are known to be polarized.
- OSTI ID:
- 44756
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 9 Vol. 51; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
Similar Records
High-energy photons from expanding quark-gluon plasma and hot hadronic matter
Color, spin, and flavor diffusion in quark-gluon plasmas
Journal Article
·
Sat Oct 31 23:00:00 EST 1992
· Physical Review, D (Particles Fields); (United States)
·
OSTI ID:7072662
Color, spin, and flavor diffusion in quark-gluon plasmas
Journal Article
·
Mon May 09 00:00:00 EDT 1994
· Physical Review Letters; (United States)
·
OSTI ID:7068455