Jet (de)coherence in Pb–Pb collisions at the LHC

Mehtar-Tani, Yacine; Tywoniuk, Konrad

doi:10.1016/j.nuclphysa.2014.09.057

Cited by 6 publications

(7 citation statements)

References 34 publications

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“…unless further soft radiation attributed to decoherence is added [187]. It would be very interesting to see how well they predict the A J -dependence and the R-dependence of the / p Tdistribution as in figure 13 and figure 14, in particular in the soft and semi-hard momentum regimes.…”

Section: Jhep03(2017)135mentioning

confidence: 92%

Angular structure of jet quenching within a hybrid strong/weak coupling model

Casalderrey-Solana

Gulhan

Milhano

et al. 2017

J. High Energ. Phys.

121

145

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Within the context of a hybrid strong/weak coupling model of jet quenching, we study the modification of the angular distribution of the energy within jets in heavy ion collisions, as partons within jet showers lose energy and get kicked as they traverse the strongly coupled plasma produced in the collision. To describe the dynamics transverse to the jet axis, we add the effects of transverse momentum broadening into our hybrid construction, introducing a parameter K ≡q/T 3 that governs its magnitude. We show that, because of the quenching of the energy of partons within a jet, even when K = 0 the jets that survive with some specified energy in the final state are narrower than jets with that energy in proton-proton collisions. For this reason, many standard observables are rather insensitive to K. We propose a new differential jet shape ratio observable in which the effects of transverse momentum broadening are apparent. We also analyze the response of the medium to the passage of the jet through it, noting that the momentum

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Section: Jhep03(2017)135mentioning

confidence: 92%

Angular structure of jet quenching within a hybrid strong/weak coupling model

Casalderrey-Solana

Gulhan

Milhano

et al. 2017

J. High Energ. Phys.

121

145

View full text Add to dashboard Cite

show abstract

“…In particular, the BDMPS cascade exhibits scaling properties, akin to wave turbulence [15], that are apparently absent in the DGLAP cascade. Also, as was recently emphasized, the BDMPS cascade provides a natural mechanism for the transport of energy towards large angles, which contrasts with the strong angular ordering of QCD cascades in vacuum [16,17,18,19].…”

Section: Introductionmentioning

confidence: 99%

Energy flow along the medium-induced parton cascade

Blaizot

Mehtar-Tani

2016

Annals of Physics

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We discuss the dynamics of parton cascades that develop in dense QCD matter, and contrast their properties with those of similar cascades of gluon radiation in vacuum. We argue that such cascades belong to two distinct classes that are characterized respectively by an increasing or a constant (or decreasing) branching rate along the cascade. In the former class, of which the BDMPS, medium-induced, cascade constitutes a typical example, it takes a finite time to transport a finite amount of energy to very soft quanta, while this time is essentially infinite in the latter case, to which the DGLAP cascade belongs. The medium induced cascade is accompanied by a constant flow of energy towards arbitrary soft modes, leading eventually to the accumulation of the initial energy of the leading particle at zero energy. It also exhibits scaling properties akin to wave turbulence. These properties do not show up in the cascade that develops in vacuum. There, the energy accumulates in the spectrum at smaller and smaller energy as the cascade develops, but the energy never flows all the way down to zero energy. Our analysis suggests that the way the energy is shared among the offsprings of a splitting gluon has little impact on the qualitative properties of the cascades, provided the kernel that governs the splittings is not too singular.

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“…The interplay between jet coherence/decoherence seems to be essential to get the same qualitative picture as one can observe from experimental data. Q-PYTHIA (see figure 4, Top) can be seen as the complete decoherence picture while in figure 4 (Bottom) [31], the dashed region corresponds to the complete coherence of subsequent radiation. As one can see, none of them alone is able to describe the complete evolution of the jet fragmentation as a function of the energy carried by the particles.…”

Section: Experimental Evidencesmentioning

confidence: 99%

Recent progress on the understanding of the medium-induced jet evolution and energy loss in pQCD

Apolinário

2017

EPJ Web Conf.

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Abstract. Motivated by the striking modifications of jets observed both at RHIC and the LHC, significant progress towards the understanding of jet dynamics within QGP has occurred over the last few years. In this talk, I review the recent theoretical developments in the study of medium-induced jet evolution and energy loss within a perturbative framework. The main mechanisms of energy loss and broadening will be firstly addressed with focus on leading particle calculations beyond the eikonal approximation. Then, I will provide an overview of the modifications of the interference pattern between the different parton emitters that build up the parton shower when propagating through an extended coloured medium. I will show that the interplay between color coherence/decoherence that arises from such effects is the main mechanism for the modification of the jet core angular structure. Finally, I discuss the possibility of a probabilistic picture of the parton shower evolution in the limit of a very dense or infinite medium.

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Jet (de)coherence in Pb–Pb collisions at the LHC

Cited by 6 publications

References 34 publications

Angular structure of jet quenching within a hybrid strong/weak coupling model

Angular structure of jet quenching within a hybrid strong/weak coupling model

Energy flow along the medium-induced parton cascade

Recent progress on the understanding of the medium-induced jet evolution and energy loss in pQCD

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