High momentum dilepton production from jets in a quark gluon plasma

Turbide, Simon; Gale, Charles; Srivastava, D. K.; Fries, Rainer J.

doi:10.1103/physrevc.74.014903

Cited by 38 publications

(82 citation statements)

References 59 publications

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“…Refined calculations, also taking into account energy loss of the jet before the photon is produced, confirm this result [23,24,25]. Fig.…”

Section: Photons From Jetssupporting

confidence: 60%

“…Fig. 5 shows a recent calculation for expected dilepton yields at the Large Hadron Collider (LHC, √ s N N = 5.5 TeV) as a function of dilepton mass M [25]. At LHC the relative contribution from jet-medium photons will be even larger than at RHIC.…”

Section: Photons From Jetsmentioning

confidence: 99%

“…Different contributions to direct photon production in heavy ion collisions. From left: prompt photons from initial hard scatterings of partons; (vacuum) bremsstrahlung from jets; thermal photons from the quark gluon plasma; jets emitted from jet-plasma interactions [25]. The sources are thermal radiation (dash-dotted line), direct primary hard scattering (dashed line), bremsstrahlung (dash-dot-dotted line) and jet-medium interactions (dotted line).…”

Section: Photons From Jetsmentioning

confidence: 99%

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Quark and Gluon Degrees of Freedom in High-Energy Heavy Ion Collisions

Fries

2008

Nuclear Physics A

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I discuss some recent progress in our understanding of high energy nuclear collisions. I will focus on two topics which I was lucky to co-pioneer in the recent past. One is recombination of quarks and its interpretation as a signal for deconfinement, the second is electromagnetic radiation from jets passing through a quark gluon plasma. This talk was given during the award ceremony for the 2007 IUPAP Young Scientist Award.

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“…Refined calculations, also taking into account energy loss of the jet before the photon is produced, confirm this result [23,24,25]. Fig.…”

Section: Photons From Jetssupporting

confidence: 60%

Section: Photons From Jetsmentioning

confidence: 99%

Section: Photons From Jetsmentioning

confidence: 99%

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Quark and Gluon Degrees of Freedom in High-Energy Heavy Ion Collisions

Fries

2008

Nuclear Physics A

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“…These features reflect the small flow anisotropies during the early QGP stage, especially for dileptons with large p T and M whose production requires high temperatures and is therefore peaked at very early times. One should keep in mind, however, that the present analysis does not include lepton pairs produced via the Drell-Yan and jet fragmentation processes, nor those produced through jet-plasma interactions [45]. These can contribute their own characteristic azimuthal asymmetries [22].…”

Section: Dilepton Emission Rates and Spectramentioning

confidence: 99%

Elliptic flow of thermal dileptons in relativistic nuclear collisions

et al. 2007

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We calculate the transverse momentum and invariant mass dependence of elliptic flow of thermal dileptons for Au+Au collisions at the Relativistic Heavy Ion Collider. The system is described using hydrodynamics, with the assumption of formation of a thermalized quark-gluon plasma at some early time, followed by cooling through expansion, hadronization, and decoupling. Dileptons are emitted throughout the expansion history: by annihilation of quarks and antiquarks in the early quark-gluon plasma stage and through a set of hadronic reactions during the late hadronic stage. The resulting differential elliptic flow exhibits a rich structure, with different dilepton mass windows providing access to different stages of the expansion history. Elliptic flow measurements for dileptons, combined with those of hadrons and direct photons, are a powerful tool for mapping the time evolution of heavy-ion collisions.

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“…α and α s are the electromagnetic and strong coupling constant, T is the local temperature at x, f q is the phase space distribution of fast quarks interacting with the medium and e f is the electric charge of a quark with the index f running over all active quark flavors. This rate has subsequently also been calculated for virtual photons [16,17]. We note that the photon rate is proportional to T 2 ln 1/T , and hence the total yield of backscattering photons is rather sensitive to the medium temperature.…”

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confidence: 99%

Jet-Tagged Back-Scattering Photons for Quark Gluon Plasma Tomography

Fries

Srivastava

2013

Nuclear Physics A

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Direct photons are important probes for quark gluon plasma created in high energy nuclear collisions. Various sources of direct photons in nuclear collisions are known, each of them endowed with characteristic information about the production process. However, it has been challenging to separate direct photon sources through measurements of single inclusive photon spectra and photon azimuthal asymmetry. Here we explore a method to identify photons created from the back-scattering of high momentum quarks off quark gluon plasma. We show that the correlation of back-scattering photons with a trigger jet leads to a signal that should be measurable at RHIC and LHC.Photons and dileptons have long been considered good probes of the hot and dense fireball created in high energy nuclear collisions. This is mostly due to the fact that the probability for particles without color charge to reinteract after their creation is negligible. Here we will mostly focus on photons though many of the arguments are equally valid for virtual photons and the dilepton pairs into which they decay.Many sources of direct photons are known in high energy nuclear collisions: This includes (i) hard initial and fragmentation photons [1], which emerge from high momentum transfer scatterings of partons in the first instance of the collisions, either directly or as bremsstrahlung off quark and gluon jets. These photon sources are also active in collisions of protons. After the initial phase there is a pre-equilibrium phase that can last up to 1 fm/c in which (ii) pre-equilibrium photons can be emitted. The dynamics during the pre-equilibrium phase is not well understood and estimates of photon production under widely different assumptions are available [2,3]. There is ample evidence that eventually an equilibrated quark gluon plasma (QGP) is created in collisions at energies available at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC). This leads to the emission of (iii) thermal photon radiation [4,5,6,7] which has been used as a thermometer for the hot nuclear matter created in those collisions [8]. As the fireball cools and expands confinement of partons into hadrons sets in. This could lead to (iv) photons from hadronization processes [9]. After hadronization the matter is still hot enough to emit (v) thermal photons from the hadronic phase [4]. Lastly we mention the source of photons that we will be interested in isolating here, (vi) photons from interactions of fast partons in QGP. It has been argued that interactions of fast quarks and gluons with QGP, that lead to energy loss of those partons can also produce photons through Compton scattering, annihilation and bremsstrahlung [10,11,12]. As in the purely electromagnetic sector Compton and annihilation photons in QCD can be emitted in back-scattering kinematics, making them a potentially high-yield source at large momenta. In these proceedings we discuss how these back-scattering

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High momentum dilepton production from jets in a quark gluon plasma

Cited by 38 publications

References 59 publications

Quark and Gluon Degrees of Freedom in High-Energy Heavy Ion Collisions

Quark and Gluon Degrees of Freedom in High-Energy Heavy Ion Collisions

Elliptic flow of thermal dileptons in relativistic nuclear collisions

Jet-Tagged Back-Scattering Photons for Quark Gluon Plasma Tomography

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