Jet coherence in QCD media: the antenna radiation spectrum

Mehtar-Tani, Yacine; Tywoniuk, Konrad

doi:10.1007/jhep01(2013)031

Cited by 30 publications

(18 citation statements)

References 44 publications

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“…Interactions with the medium and the emission of the gluon are treated in the eikonal approximation which is valid at high energies up to the leading logarithm [15,16]. Within this setup the interference spectrum was derived in [40,43] and reads…”

Section: Jhep10(2012)197mentioning

confidence: 99%

The radiation pattern of a QCD antenna in a dense medium

Mehtar-Tani

Salgado

Tywoniuk

2012

J. High Energ. Phys.

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Abstract:We calculate the radiation spectrum off a qq pair of a fixed opening angle θ qq traversing a medium of length L. Multiple interactions with the medium are handled in the harmonic oscillator approximation, valid for soft gluon emissions. We discuss the time-scales relevant to the decoherence of correlated partons traversing the medium and demonstrate how this relates to the hard scale that govern medium-induced radiation. For large angle radiation, the hard scale is given by Q hard = max r −1 ⊥ , Q s , where r ⊥ = θ qq L is the probed transverse size and Q s is the maximal transverse momentum accumulated by the emitted gluon in the medium. These situations define in turn two distinct regimes, which we call "dipole" and "decoherence" regimes, respectively, which are discussed in detail. A feature common to both cases is that coherence of the radiation is restored at large transverse momenta, k ⊥ > Q hard .

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Section: Jhep10(2012)197mentioning

confidence: 99%

The radiation pattern of a QCD antenna in a dense medium

Mehtar-Tani

Salgado

Tywoniuk

2012

J. High Energ. Phys.

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“…[8] for gluon emissions in the soft limit and extended to finite gluon energy in refs. [34,35]. We work in the framework of classical Yang-Mills (CYM) equations which is appropriate for soft gluon production, e.g., see ref.…”

Section: Jhep04(2012)064mentioning

confidence: 99%

“…This marks the onset of a "dense" regime, which we plan to study in an upcoming publication. The antenna radiation in medium was studied for the multiple-soft scattering approximation in [8] for the soft limit and approached analytically in [34,35].…”

Section: Jhep04(2012)064mentioning

confidence: 99%

The radiation pattern of a QCD antenna in a dilute medium

Mehtar-Tani

Salgado

Tywoniuk

2012

J. High Energ. Phys.

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Radiative interferences in the multi-parton shower is the building block of QCD jet physics in vacuum. The presence of a hot medium made of quarks and gluons is expected to alter this interference pattern. To study these effects, we derive the gluon emission spectrum off a color-correlated quark-antiquark pair (antenna) traversing a colored medium to first order in the medium density. The resulting induced gluon distribution is found to be governed by the hardest scale of the problem. In our setup, this can either be the inverse antenna transverse size, r −1 ⊥ , or the scale related to the transverse color correlation length in the medium, which is given by the Debye mass m D . This emerging scale opens the angular phase space of emissions off the antenna compared to the vacuum case and gives rise to a typical transverse momentum of the medium-induced emitted gluons, k 2 ⊥ med ∼ max(r. Above the hard scale interference effects suppress the spectrum resulting in the restoration of vacuum coherence.

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“…On the theoretical side, progress in the last few years has been reached in different fronts, as improvements in the splitting probability [14,15], the use of effective theories as SCET [16][17][18], or the study of multi-parton radiation [17]. A systematic program to understand the in-medium intrajet color coherence effects, using the antenna setup, has also been started, leading to extremely valuable information about the role of interferences [24][25][26][27][28][29][30]. A clear new picture of the jet quenching phenomena is emerging from these studies [31,32].…”

Section: Introductionmentioning

confidence: 99%

Color coherence in a heavy quark antenna radiating gluons inside a QCD medium

2014

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We compute the color coherence effects for soft gluon radiation off antennas containing heavy quarks in the presence of a QCD medium -the actual calculations is made for a triplet configuration and then generalize to both color singlet and octet ones. This work completes the studies of antenna radiation inside a medium which provide a useful picture of the relevance of interference effects in jet parton showers for the jet quenching phenomenon observed in high-energy nuclear collisions. The analysis is performed resumming the multiple scatterings of the partonic system with the medium. The main conclusion is that decorrelation due to color rotation is more effective in the case in which at least one of the emitters of the antenna is a heavy quark. This effect, present both for a heavy-quark-antiquark or a heavy-quark-gluon antenna is more relevant for the later or for the case in which the energies of the quark and antiquark are very different. The parameter controlling these effects involves the deadcone angle. We find that interferences are cancelled, spoiling the color correlation of the pair, whenωL where E and ω are the energies of the heavy quark and the radiated gluon and L is the medium length. In the case of a heavy-quark-antiquark antenna t form , defined as the difference in splitting times in amplitude and complex conjugate of the amplitude, appears instead of L if the original splitting is symmetric. The presence or absence of interferences modifies the energy loss pattern.

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Jet coherence in QCD media: the antenna radiation spectrum

Cited by 30 publications

References 44 publications

The radiation pattern of a QCD antenna in a dense medium

The radiation pattern of a QCD antenna in a dense medium

The radiation pattern of a QCD antenna in a dilute medium

Color coherence in a heavy quark antenna radiating gluons inside a QCD medium

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