Quenching effects in the cumulative jet spectrum

Takács, Ádám; Tywoniuk, Konrad

doi:10.1007/jhep10(2021)038

Cited by 14 publications

(10 citation statements)

References 70 publications

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“…For high-p T jets, where τ 1, one is naturally dominated by D(x, τ ; {g}) ≈ D g (x, τ ) and D(x, τ ; {q}) ≈ D S (x, τ ), as discussed above. For the moment, we also neglect possible early vacuum-like evolution that can take place prior to when medium effects become dominant [43][44][45].…”

Section: Transverse Momentum Dependence Of Jet Suppressionmentioning

confidence: 99%

Medium-induced cascade in expanding media

Adhya

Salgado

Spousta

et al. 2020

J. High Energ. Phys.

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Detailed insight into the interplay between parton energy loss and the way deconfined medium created in heavy-ion collisions expands is of great importance for improving the understanding of the jet quenching phenomenon. In this paper we study the impact of the expansion of deconfined medium on the single-gluon emission spectrum, its resummation and the jet suppression factor (QAA) within the BDMPS-Z formalism. We calculate these quantities for three types of expansion scenarios, namely static, exponentially decaying and Bjorken expanding media. The distribution of medium-induced gluons is calculated using an evolution equation with splitting kernels derived from the gluon emission spectra. A universal behavior of splitting kernels is derived in the regime of soft gluon emissions when evaluated at a common effective evolution time τeff. Novel scaling features of the resulting gluon distribution and jet QAA are discussed. For realistic spectra valid beyond the soft-gluon emission limit, where the results are obtained by a numerical solution of the evolution equation, these features are partially replaced by a scaling expected from considering an averaged jet quenching parameter along the trajectory of propagation. Further we show that differences arising from different types of the medium expansion can be to a large extent scaled out by appropriate choice of the quenching parameter. Sizable differences among the values of the quenching parameter for different types of medium expansion point to the importance of the medium expansion for precise modeling of the jet quenching phenomenon.

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Section: Transverse Momentum Dependence Of Jet Suppressionmentioning

confidence: 99%

Medium-induced cascade in expanding media

Adhya

Salgado

Spousta

et al. 2020

J. High Energ. Phys.

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“…[53][54][55][56], while a novel expansion scheme has been proposed at the analytic level [57] and applied to some global observables in Refs. [58,59]. Significant advances have been made on the evolution of this gluonic cascade [60][61][62][63] and its cross-talk with the vacuum evolution [38].…”

Section: B In-medium Calculationmentioning

confidence: 99%

“…with ω max = min(Q s /R, ω c ) and ν = n/p t . Note that recent works have gone beyond the single parton energy loss picture for global observables by resuming the effects of the fluctuating substructure on the total energy loss [58,59,75]. We will extend that formalism to jet substructure observables in a separate publication [50].…”

Section: Energy Lossmentioning

confidence: 99%

“…Ref. [59,[76][77][78] for a possible way out. This feature also explains the a-dependence of the ratio in the bottom panel.…”

Section: Energy Lossmentioning

confidence: 99%

“…To disentangle these two filtering effects, i.e. (i) towards coherent, "unresolved" jets and (ii) quark-initiated jets, an interesting possibility is to measure the θ g distribution in Z/γ+jet events [59,76,79]. 26).…”

Section: Energy Lossmentioning

confidence: 99%

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Dynamically groomed jet radius in heavy-ion collisions

Caucal,

Soto-Ontoso,

Takacs

2021

Preprint

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We explore the ability of a recently proposed jet substructure technique, Dynamical Grooming, to pin down the properties of the Quark-Gluon Plasma formed in ultra-relativistic heavy-ion collisions.In particular, we compute, both analytically and via Monte-Carlo simulations, the opening angle θg of the hardest splitting in the jet as defined by Dynamical Grooming. Our calculation, grounded in perturbative QCD, accounts for the factorization in time between vacuum-like and medium-induced processes in the double logarithmic approximation. We observe that the dominating scale in the θgdistribution is the decoherence angle θc which characterises the resolution power of the medium to propagating color probes. This feature also persists in strong coupling models for jet quenching. We further propose for potential experimental measurements a suitable combination of the Dynamical Grooming condition and the jet radius that leads to a pQCD dominated observable with a very small sensitivity (≤ 10%) to medium response. I. JET SUBSTRUCTURE IN HEAVY-ION COLLISIONS

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Disentangling jet modification in jet simulations and in Z+jet data

Brewer

Brodsky

Rajagopal

2022

J. High Energ. Phys.

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The selection of jets in heavy-ion collisions based on their pT after jet quenching is known to bias towards jets that lost little energy in the quark-gluon plasma. In this work, we study and quantify the impact of this selection bias on jet substructure observables so as to isolate effects caused by the modification of the substructure of jets by quenching. We do so at first in a simplified Monte Carlo study in which it is possible to identify the same jet before and after quenching. We show explicitly that jets selected based on their quenched (i.e. observable) pT have substantially smaller fractional energy loss than those selected based on the pT that they would have had in the absence of any quenching. This selection bias has a large impact on jet structure and substructure observables. As an example, we consider the angular separation ∆R of the hardest splitting in each jet, and find that the ∆R distribution of the (biased) sample of jets selected based upon their quenched pT is almost unmodified by quenching. In contrast, quenching causes dramatic modifications to the ∆R distribution of a sample of jets selected based upon their unquenched pT, with a significant enhancement at larger ∆R coming from the soft particles originating from the wake of the jet in the quark-gluon plasma. The jets which contribute to this enhancement are those which have lost the most energy and which were, therefore, left out of the sample selected after quenching. In a more realistic study, we then show that the same qualitative effects can all be observed in Z+jet events. Selecting jets in such events based on either the jet pT or the Z-boson pT provides an experimentally accessible way to quantify the effects of selection biases in jet observables and separate them from the modification of jet substructure caused by quenching. Selecting Z+jet events based upon the jet pT yields a ∆R distribution that appears almost unmodified whereas selecting Z+jet events based upon the Z-boson pT reveals a significant modification to the ∆R-distribution caused by quenching, once again arising from the wakes of those jets that lose more energy.

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Quenching effects in the cumulative jet spectrum

Cited by 14 publications

References 70 publications

Medium-induced cascade in expanding media

Medium-induced cascade in expanding media

Dynamically groomed jet radius in heavy-ion collisions

Disentangling jet modification in jet simulations and in Z+jet data

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