Origins of the di-jet asymmetry in heavy-ion collisions

Milhano, José Guilherme; Zapp, Korinna

doi:10.1140/epjc/s10052-016-4130-9

Cited by 101 publications

(102 citation statements)

References 52 publications

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“…This is a consequence of the fact that wider jets typically contain more, and less hard, partonic fragments and lose more energy than narrower jets with the same energy. The same phenomenon has been observed in calculations of jet quenching that are entirely done at strong coupling [145,147] and in Monte Carlo calculations of radiative energy loss that are entirely done at weak coupling [105]. We find that this observation leads to two unexpected consequences.…”

Section: Jhep03(2017)135supporting

confidence: 80%

“…Because of the steeply falling spectrum, there are not many jets that originate with higher energies, lose energy, and end up in the given energy bin. The result is a narrowing of jets that remain in a given energy bin, something that has been seen previously in both perturbative [105] and holographic [145,147] analyses. And, we see from the K = 0 results in figure 4 that narrower dijets are less acoplanar.…”

Section: Jhep03(2017)135supporting

confidence: 61%

“…(See ref. [105] for a similar effect in a perturbative-based jet quenching Monte Carlo [76,77,81,82].) The small-z region of the fragmentation function is sensitive to backreaction effects.…”

Section: Jhep03(2017)135mentioning

confidence: 90%

“…This happens if wider jets lose more energy than narrower jets (as is the case in perturbative calculations in QCD [166] and in holographic calculations of jets in strongly coupled N = 4 SYM theory [145]) and if the probability distribution for the jet production absent any medium effects is a steeply falling function of jet energy, as is the case. Recent weakly coupled Monte Carlo calculations of an ensemble of QCD jets in heavy ion collisions as compared with those in proton-proton collisions [105] and recent holographic analyses of how propagation through plasma modifies the energy and opening angle distribution of an ensemble of N = 4 SYM jets with initial distributions as in perturbative QCD [147] both provide clear illustrations of how jets with a given energy can end up narrower in heavy ion collisions even though every individual jet broadens as it propagates through plasma. We shall find the same in our hybrid model.…”

Section: Jhep03(2017)135mentioning

confidence: 99%

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

Casalderrey-Solana

Gulhan

Milhano

et al. 2017

J. High Energ. Phys.

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120

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)135supporting

confidence: 80%

Section: Jhep03(2017)135supporting

confidence: 61%

Section: Jhep03(2017)135mentioning

confidence: 90%

Section: Jhep03(2017)135mentioning

confidence: 99%

See 2 more Smart Citations

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

Casalderrey-Solana

Gulhan

Milhano

et al. 2017

J. High Energ. Phys.

Self Cite

120

145

View full text Add to dashboard Cite

show abstract

“…In a back-to-back dijet pair propagating through the QGP, the sub-leading jet has typically lost more energy than its leading partner [56]. This quenching asymmetry can be combined with ΔS 12 to experimentally further constrain the nature of jet quenching.…”

Section: Subjets In Dijet Pairsmentioning

confidence: 99%

Novel subjet observables for jet quenching in heavy-ion collisions

et al. 2018

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Using a novel observable that relies on the momentum difference of the two most energetic subjets within a jet ΔS 12 we study the internal structure of highenergy jets simulated by several Monte Carlo event generators that implement the partonic energy-loss in a dense partonic medium. Based on inclusive jet and dijet production we demonstrate that ΔS 12 is an effective tool to discriminate between different models of jet modifications over a broad kinematic range. The new quantity, while preserving the collinear and infrared safety of modern jet algorithms, it is experimentally attractive because of its inherent resilience against backgrounds of heavy-ion collisions.

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Molière scattering in quark-gluon plasma: finding point-like scatterers in a liquid

DʼEramo

Rajagopal

Yin

2019

J. High Energ. Phys.

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By finding rare (but not exponentially rare) large-angle deflections of partons within a jet produced in a heavy ion collision, or of such a jet itself, experimentalists can find the weakly coupled short-distance quark and gluon particles (scatterers) within the strongly coupled liquid quark-gluon plasma (QGP) produced in heavy ion collisions. This is the closest one can come to probing QGP via a scattering experiment and hence is the best available path toward learning how a strongly coupled liquid emerges from an asymptotically free gauge theory. The short-distance, particulate, structure of liquid QGP can be revealed in events in which a jet parton resolves, and scatters off, a parton from the droplet of QGP. The probability for picking up significant transverse momentum via a single scattering was calculated previously, but only in the limit of infinite parton energy which means zero angle scattering. Here, we provide a leading order perturbative QCD calculation of the Molière scattering probability for incident partons with finite energy, scattering at a large angle. We set up a thought experiment in which an incident parton with a finite energy scatters off a parton constituent within a "brick" of QGP, which we treat as if it were weakly coupled, as appropriate for scattering with large momentum transfer, and compute the probability for a parton to show up at a nonzero angle with some energy. We include all relevant channels, including those in which the parton that shows up at a large angle was kicked out of the medium as well as the Rutherford-like channel in which what is seen is the scattered incident parton. The results that we obtain will serve as inputs to future jet Monte Carlo calculations and can provide qualitative guidance for how to use future precise, high statistics, suitably differential measurements of jet modification in heavy ion collisions to find the scatterers within the QGP liquid.

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Origins of the di-jet asymmetry in heavy-ion collisions

Cited by 101 publications

References 52 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

Novel subjet observables for jet quenching in heavy-ion collisions

Molière scattering in quark-gluon plasma: finding point-like scatterers in a liquid

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