On the breaking of Casimir scaling in jet quenching

Apolinário, Liliana; Barata, João; Milhano, José Guilherme

doi:10.1140/epjc/s10052-020-8133-1

Cited by 7 publications

(5 citation statements)

References 34 publications

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“…So, in principle, the 𝛾+jet and inclusive 𝑅 𝐴𝐴 could be different simply because their jet spectra have different steepness values. Furthermore, as was argued in [8], the color factor dependence can be diluted as the jet cascade develops, breaking Casimir scaling. In order to deconvolute bin migration and spectrum shape influence from the actual jet energy loss we can try to calculate the 𝑄 𝐴𝐴 for 𝛾+jets and dĳets and get a less biased estimate.…”

Section: Pos(hardprobes2023)184mentioning

confidence: 80%

“…Furthermore, the jet deposits energy in the medium while travelling through it and part of that energy is reconstructed inside the jet, i.e., medium response. These mechanisms compete for jet radius variation of energy loss [7,8]. To gain insight into these medium-induced effects, the usual strategy is to compare samples of medium jets produced in heavy-ion collisions with samples of vacuum jets produced in pp collisions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Unbiased quantification of jet energy loss

Silva,

Apolinario,

Luís

et al. 2024

Proceedings of 11th International Conference on Hard and Elecctromagnetic Probes of High-Energy Nuclear Collisions — PoS(HardPr

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Bin migration effects hinder a direct connection between the nuclear modification factor 𝑅 𝐴𝐴 and the energy lost by jets. The 𝑅 𝐴𝐴 compares yields of jets in pp and AA collisions that are reconstructed with the same 𝑝 𝑇 and is thus biased by the steeply falling nature of the jet spectrum. To mitigate these effects, Brewer et al. [1] introduced a novel observable to directly quantify average jet energy loss (𝑄 𝐴𝐴 ) which is given by the ratio of the transverse momenta that correspond to the same probability quantiles in pp and AA spectra. This work reinforces the claim that 𝑄 𝐴𝐴 ratio is a reliable proxy for jet energy loss and, by using it, it shows that energy loss decreases with increasing jet radius when QGP response, as implemented in the JEWEL event generator, is accounted for. Further, our results establish that, contrary to recent claims, the difference in 𝑅 𝐴𝐴 between inclusive and boson-jet events is dominated by differences in the spectral shape, leaving the colour charge of the jet initiating parton with a minor role to play. The experimental feasibility of a 𝑄 𝐴𝐴 measurement is addressed.

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Section: Pos(hardprobes2023)184mentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Unbiased quantification of jet energy loss

Silva,

Apolinario,

Luís

et al. 2024

Proceedings of 11th International Conference on Hard and Elecctromagnetic Probes of High-Energy Nuclear Collisions — PoS(HardPr

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show abstract

“…To the extent that the quarkgluon plasma sees a jet as an extended object with the color of the initiating parton, gluon jets will lose more energy by a factor of their larger color charge. Deviations from this scaling would suggest that the quark-gluon plasma resolves finer scales within the jet [37]. Unfortunately, jet measurements are generally a mixture of both quark-and gluon-initiated jets, which makes constraining their separate energy loss difficult.…”

Section: Pos(hardprobes2020)012mentioning

confidence: 99%

Jets as a probe of the quark-gluon plasma

Brewer¹

2021

Proceedings of 10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions — PoS(HardPro

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The suppression and modification of high-energy processes, like jets, in heavy-ion collisions provides an important window to access the degrees of freedom of this exotic material on different length scales. Despite increasingly precise and differential measurements of the properties of jets in heavy-ion collisions, however, it has remained challenging to use jets to make unambiguous and model-independent statements about the quark-gluon plasma. Here I will give a personal take on some origins of these challenges, including the difficulty of modelling and biases from jet selection that obfuscate the direct interpretation of jet modification measurements. I will discuss a few model studies that have helped to disentangle the source of non-intuitive effects in measurements, and finally highlight data-driven approaches as an interesting opportunity toward studying the quark-gluon plasma in a model-independent way.

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“…To the extent that the quarkgluon plasma sees a jet as an extended object with the color of the initiating parton, gluon jets will lose more energy by a factor of their larger color charge. Deviations from this scaling would suggest that the quark-gluon plasma resolves finer scales within the jet [39]. Unfortunately, jet measurements are generally a mixture of both quark-and gluon-initiated jets, which makes constraining their separate energy loss difficult.…”

Section: Toward Interpreting Data Without Modelsmentioning

confidence: 99%

Jets as a probe of the quark-gluon plasma

Brewer¹

2020

Preprint

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The suppression and modification of high-energy objects, like jets, in heavy-ion collisions provide an important window to access the degrees of freedom of the quark-gluon plasma on different length scales. Despite increasingly precise and differential measurements of the properties of jets in heavy-ion collisions, however, it has remained challenging to use jets to make unambiguous and model-independent statements about the quark-gluon plasma. Here I will give a personal take on some origins of these challenges, including the difficulty of modelling and biases from jet selection that obfuscate the direct interpretation of jet modification measurements. I will discuss a few model studies that have helped to disentangle the source of non-intuitive effects in measurements, and finally highlight data-driven approaches as an interesting opportunity toward studying the quark-gluon plasma in a model-independent way using jets.

show abstract

On the breaking of Casimir scaling in jet quenching

Cited by 7 publications

References 34 publications

Unbiased quantification of jet energy loss

Unbiased quantification of jet energy loss

Jets as a probe of the quark-gluon plasma

Jets as a probe of the quark-gluon plasma

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