Medium Modification of Jet Fragmentation in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Au</mml:mi><mml:mo mathvariant="bold">+</mml:mo><mml:mi>Au</mml:mi></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo mathvariant="bold">=</mml:mo><mml:mn>200</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mte

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doi:10.1103/physrevlett.111.032301

Cited by 50 publications

(25 citation statements)

References 34 publications

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“…By contrast, at RHIC energies, measurements based on correlations of hadrons with leading reconstructed jets or non-decay (direct) photons indicate that the lost energy remains much closer to the jet axis [15,16], suggesting only a moderate broadening of the jet structure for all but the softest constituents. The difference between the RHIC and LHC energy results could be due to a number of different reasons; both the details of the experimental analyses and the mean parton kinematics being probed at the two facilities differ significantly.…”

mentioning

confidence: 87%

Dijet imbalance measurements in Au+Au and pp collisions at sNN

Adamczyk¹,

Adkins²,

Agakishiev³

et al. 2017

Phys. Rev. Lett.

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mentioning

confidence: 87%

Dijet imbalance measurements in Au+Au and pp collisions at sNN

Adamczyk¹,

Adkins²,

Agakishiev³

et al. 2017

Phys. Rev. Lett.

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“…With the understanding of the transverse distribution of intra-jet particles through the studies of jet shapes and cross sections, it would be interesting to study the modification of their longitudinal distribution to gain orthogonal information about the in-medium parton shower [17,18,131,132]. We leave the studies of jet fragmentation function modification using the SCET formulation [120,133,134], as well as the modification of jet masses [135][136][137][138] which probes the jet formation mechanism at the soft scale, for future work.…”

Section: Jhep05(2016)023mentioning

confidence: 99%

Towards the understanding of jet shapes and cross sections in heavy ion collisions using soft-collinear effective theory

Chien

Vitev

2016

J. High Energ. Phys.

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We calculate the jet shape and the jet cross section in heavy ion collisions using soft-collinear effective theory (SCET) and its extension with Glauber gluon interactions in the medium (SCET G ). We use the previously developed framework to systematically resum the jet shape at next-to-leading logarithmic accuracy, and we consistently include the medium modification by incorporating the leading order medium-induced splitting functions. The calculation provides, for the first time, a quantitative understanding of the jet shape modification measurement in lead-lead collisions at √ s NN = 2.76 TeV at the LHC. The inclusive jet suppression is also calculated within the same framework beyond the traditional concept of parton energy loss, and the dependence on the centrality, the jet radius and the jet kinematics is examined. In the end we present predictions for the anticipated jet shape and cross section measurements in lead-lead collisions at √ s NN ≈ 5.1 TeV at the LHC.

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“…This Letter presents such a measurement of the FF in high-p T jets azimuthally balanced by a prompt, isolated photon in pp and Pb+Pb collisions at a center-of-mass energy of 5.02 TeV per nucleon pair, using data samples with integrated luminosities of 25 pb −1 and 0.49 nb −1 , respectively. Photon-hadron p T correlations in gold-gold collisions were measured at the Relativistic Heavy Ion Collider [19,20]. A measurement of the γ-tagged jet FF at the LHC compared the FF at detector level with theoretical calculations that parameterize the detector smearing effects [21].Following previous measurements in ATLAS [5,6], the FF for a jet to contain a charged particle with a given p T , η and φ [22] is expressed as D(p T ) = (1/N jet )(dN ch (p T )/dp T ) or D(z) = (1/N jet )(dN ch (z)/dz) where N jet is the total number of jets, N ch is the number of charged particles associated with a jet, and the longitudinal momentum fraction, z, is defined as p T cos (∆R) /p jet T , ∆R = ((η jet − η part ) 2 + (φ jet − φ part ) 2 ) 1/2 .…”

mentioning

confidence: 99%

mentioning

confidence: 99%

Comparison of Fragmentation Functions for Jets Dominated by Light Quarks and Gluons from pp and Pb+Pb Collisions in ATLAS

Aaboud¹,

Aad²,

Abbott³

et al. 2019

Phys. Rev. Lett.

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The ATLAS Collaboration Charged-particle fragmentation functions for jets azimuthally balanced by a high-transversemomentum, prompt, isolated photon are measured in 25 pb −1 of pp and 0.49 nb −1 of Pb+Pb collision data at 5.02 TeV per nucleon pair recorded with the ATLAS detector at the Large Hadron Collider. The measurements are compared to predictions of Monte Carlo generators and to measurements of inclusively selected jets. In pp collisions, a different jet fragmentation function in photon-tagged events from that in inclusive jet events arises from the difference in fragmentation between light quarks and gluons. The ratios of the fragmentation functions in Pb+Pb events to that in pp events are used to explore the parton color-charge dependence of jet quenching in the hot medium. In relatively peripheral collisions, fragmentation functions exhibit a similar modification pattern for photon-tagged and inclusive jets. However, photontagged jets are observed to have larger modifications than inclusive jets in central Pb+Pb events.Ultrarelativistic nucleus-nucleus collisions create a quark-gluon plasma, a hot, dense, and long-lived system of deconfined quarks and gluons. The high density of unscreened color charges causes hard-scattered partons with large transverse momentum (p T ) to lose energy as they traverse the medium, a phenomenon referred to as jet quenching. In lead-lead (Pb+Pb) collisions at the Large Hadron Collider (LHC), jet production rates at fixed p T are suppressed relative to proton-proton (pp) collisions [1][2][3][4]. Since the parton shower develops inside the quark-gluon plasma, the momentum distributions of hadrons in the quenched jet are also modified. Measurements of the jet fragmentation function (FF) for inclusively produced jets in Pb+Pb collisions [5-7] exhibit differences from pp collisions. In these measurements, jets are selected by their final-state p T , i.e. after the effects of quenching, which may result in a bias towards jets that have suffered only modest modifications and complicates interpretation of the data [8, 9]. Alternatively, the initial parton p T can be tagged with a particle unaffected by the medium, such as a photon (γ) [10][11][12].The photon approximately balances the parton p T before quenching and thus selects populations of jets in pp and Pb+Pb collisions with identical initial conditions. A jet recoiling against a prompt photon is more likely to be initiated by the showering of a light quark, whereas inclusive jets are mostly initiated by gluons. Thus γ-tagged jets can provide information about how energy loss depends on the color charge of the initiating parton. Finally, the photon selection equally samples all geometric production points, whereas the inclusive selection may be biased towards jets which have lost less energy or were produced near the surface of the medium [13][14][15].Many theoretical models of jet quenching have highlighted the value of γ-tagged jet measurements [16][17][18], inviting systematic comparisons of these with inclusive jet measur...

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Medium Modification of Jet Fragmentation inAu+AuCollisions atsNN=200

Cited by 50 publications

References 34 publications

Dijet imbalance measurements in Au+Au and pp collisions at sNN

Dijet imbalance measurements in Au+Au and pp collisions at sNN

Towards the understanding of jet shapes and cross sections in heavy ion collisions using soft-collinear effective theory

Comparison of Fragmentation Functions for Jets Dominated by Light Quarks and Gluons from pp and Pb+Pb Collisions in ATLAS

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