Solutions of evolution equations for medium-induced QCD cascades

Kutak, Krzysztof; Płaczek, W.; Straka, Róbert

doi:10.1140/epjc/s10052-019-6838-9

Cited by 30 publications

(46 citation statements)

References 44 publications

(70 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5.4.1, is sensitive to the large-k ⊥ tail of the k ⊥ distribution. A Monte Carlo implementation of the elastic collisions (in the diffusion approximation) has recently been presented [65] for a jet evolving via (BDMPS-Z) medium-induced radiation alone. In the future, we plan to extend the method in [65] to the full parton shower, including VLEs.…”

Section: Discussionmentioning

confidence: 99%

“…A Monte Carlo implementation of the elastic collisions (in the diffusion approximation) has recently been presented [65] for a jet evolving via (BDMPS-Z) medium-induced radiation alone. In the future, we plan to extend the method in [65] to the full parton shower, including VLEs. More generally, one could also add the effects of elastic collisions in terms of energy loss (the "drag force") and longitudinal momentum broadening.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Deciphering the 𝓏g distribution in ultrarelativistic heavy ion collisions

Caucal

Iancu

Soyez

2019

J. High Energ. Phys.

148

View full text Add to dashboard Cite

Within perturbative QCD, we develop a new picture for the parton shower generated by a jet propagating through a dense quark-gluon plasma. This picture combines in a simple, factorised, way multiple medium-induced parton branchings and standard vacuum-like emissions, with the phasespace for the latter constrained by the presence of the medium. We implement this picture as a Monte Carlo generator that we use to study two phenomenologically important observables: the jet nuclear modification factor R AA and the z g distribution reflecting the jet substructure. In both cases, the outcome of our Monte Carlo simulations is in good agreement with the LHC measurements. We provide basic analytic calculations that help explaining the main features observed in the data. We find that the energy loss by the jet is increasing with the jet transverse momentum, due to a rise in the number of partonic sources via vacuum-like emissions. This is a key element in our description of both R AA and the z g distribution. For the latter, we identify two main nuclear effects: incoherent jet energy loss and hard medium-induced emissions. As the jet transverse momentum increases, we predict a qualitative change in the ratio between the z g distributions in PbPb and pp collisions: from increasing at small z g , this ratio becomes essentially flat, or even slightly decreasing.We want to dedicate this paper to the 80 th birthday of Al Mueller, who pioneered the studies of jet quenching in perturbative QCD and was also our collaborator on a previous paper which introduced the general physical picture that we further develop in this work. arXiv:1907.04866v1 [hep-ph]

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Deciphering the 𝓏g distribution in ultrarelativistic heavy ion collisions

Caucal

Iancu

Soyez

2019

J. High Energ. Phys.

148

View full text Add to dashboard Cite

show abstract

“…Our focus here is to see to what extent the non-Gaussian spectrum of minijets as obtained in Ref. [42] is visible in the final-state observables. The study is rather of a theoretical nature since we only account for gluonic jets.…”

Section: Introductionmentioning

confidence: 89%

“…The above integral equations can be formally solved by iteration. Denoting τ = t/t * , we get [42] D…”

Section: B In-medium Evolutionmentioning

confidence: 99%

“…However, we believe that in the appropriate rapidity range, i.e., the mid-forward region, the observables we are studying are mostly sensitive to gluons but still not to the extent to account for saturation effects [39][40][41]43]. In order to describe the propagation of partons produced in hard collisions inside a hot quark-gluon plasma, we have applied the recently developed Monte Carlo generator MINCAS [42] that solves the rate equation describing the rescattering and radiation of a hard parton in a dense QCD medium [44] (for a similar approach see Refs. [18,19]).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Jet quenching and effects of non-Gaussian transverse-momentum broadening on dijet observables

et al. 2020

Self Cite

View full text Add to dashboard Cite

We study, at a qualitative level, production of jet pairs in ultrarelativistic nuclear collisions. We propose a new framework for combining k T factorization and a formalism for in-medium propagation of jet particles that takes into account stochastic transverse forces as well as medium-induced radiation. This approach allows to address dijet observables accounting for exact kinematics of the initial state. Using our framework, we provide a description of R AA data and study azimuthal decorrelations of the produced dijets. In particular, we find that the resulting dijet observables feature behavior deviating from that of jet pairs which undergo transverse-momentum broadening following the Gaussian distribution. We interpret this behavior as a consequence of dynamics encoded in the Blaizot-Dominguez-Mehtar-Tani-Iancu equation.

show abstract

A unified picture of medium-induced radiation

Isaksen

Takács

Tywoniuk

2023

J. High Energ. Phys.

View full text Add to dashboard Cite

We revisit the picture of jets propagating in the quark-gluon plasma. In addition to vacuum radiation, partons scatter on the medium constituents resulting in induced emissions. Analytical approaches to including these interactions have traditionally dealt separately with multiple, soft, or rare, hard scatterings. A full description has so far only been available using numerical methods. We achieve full analytical control of the relevant scales and map out the dominant physical processes in the full phase space. To this aim, we extend existing expansion schemes for the medium-induced spectrum to the Bethe-Heitler regime. This covers the whole phase space from early to late times, and from hard splittings to emissions below the thermal scale. Based on the separation of scales, a space-time picture naturally emerges: at early times, induced emissions start to build from rare scatterings with the medium. At a later stage, induced emissions due to multiple soft scatterings result in a turbulent cascade that rapidly degrades energy down to, and including, the Bethe-Heitler regime. We quantify the impact of such an improved picture, compared to the current state-of-the-art factorization that includes only soft scatterings, by both analytical and numerical methods for the medium-induced energy distribution function. Our work serves to improve our understanding of jet quenching from small to large systems and for future upgrades of Monte Carlo generators.

show abstract

Solutions of evolution equations for medium-induced QCD cascades

Cited by 30 publications

References 44 publications

Deciphering the 𝓏g distribution in ultrarelativistic heavy ion collisions

Deciphering the 𝓏g distribution in ultrarelativistic heavy ion collisions

Jet quenching and effects of non-Gaussian transverse-momentum broadening on dijet observables

A unified picture of medium-induced radiation

Contact Info

Product

Resources

About