Factorization of Jet Cross Sections in Heavy-Ion Collisions

Qiu, Jian‐Wei; Ringer, Felix; Sato, Nobuo; Zurita, Pía

doi:10.1103/physrevlett.122.252301

Cited by 44 publications

(31 citation statements)

References 80 publications

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“…Figure 13 shows R AA vs. p jet T for several values of R and for the top 0-10% centrality class as well as several predictions from generators and analytic calculations. The gray boxes in figure 13 are predictions from a jet factorization model based on a phenomenological approach to establish QCD factorization of jet cross sections in heavy ion collisions [92]. Mediummodified jet functions are extracted from jet nuclear modification factors at smaller jet distance parameter values (R = 0.2 and 0.4) and predictions are made for larger distance parameter values.…”

Section: Resultsmentioning

confidence: 99%

First measurement of large area jet transverse momentum spectra in heavy-ion collisions

Sirunyan

Tumasyan²,

Adam³

et al. 2021

J. High Energ. Phys.

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Jet production in lead-lead (PbPb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV is studied with the CMS detector at the LHC, using PbPb and pp data samples corresponding to integrated luminosities of 404 μb−1 and 27.4 pb−1, respectively. Jets with different areas are reconstructed using the anti-kT algorithm by varying the distance parameter R. The measurements are performed using jets with transverse momenta (pT) greater than 200 GeV and in a pseudorapidity range of |η| < 2. To reveal the medium modification of the jet spectra in PbPb collisions, the properly normalized ratio of spectra from PbPb and pp data is used to extract jet nuclear modification factors as functions of the PbPb collision centrality, pT and, for the first time, as a function of R up to 1.0. For the most central collisions, a strong suppression is observed for high-pT jets reconstructed with all distance parameters, implying that a significant amount of jet energy is scattered to large angles. The dependence of jet suppression on R is expected to be sensitive to both the jet energy loss mechanism and the medium response, and so the data are compared to several modern event generators and analytic calculations. The models considered do not fully reproduce the data.

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Section: Resultsmentioning

confidence: 99%

First measurement of large area jet transverse momentum spectra in heavy-ion collisions

Sirunyan

Tumasyan²,

Adam³

et al. 2021

J. High Energ. Phys.

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“…The concept of jet or parton energy loss has played an important role in theoretical calculations of jet quenching in heavy-ion collisions [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49]. Typically, the notion of energy loss is defined in the soft gluon approximation where flavor-changing processes are suppressed, and calculations are performed in the lowest non-trivial fixed order or resummed expansions.…”

Section: Jhep07(2021)041mentioning

confidence: 99%

“…The dependence of the energy loss mechanism on the parton flavor has been discussed extensively in the literature -in particular in the context of jet quenching studies in heavy-ion collisions [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49]. While we only focus on vacuum energy loss in this work, our results set the baseline for studies of energy loss in the nuclear medium.…”

Section: Quark/gluon Energy Lossmentioning

confidence: 99%

Leading jets and energy loss

Neill

Ringer

Sato

2021

J. High Energ. Phys.

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The formation and evolution of leading jets can be described by jet functions which satisfy non-linear DGLAP-type evolution equations. Different than for inclusive jets, the leading jet functions constitute normalized probability densities for the leading jet to carry a longitudinal momentum fraction relative to the initial fragmenting parton. We present a parton shower algorithm which allows for the calculation of leading-jet cross sections where logarithms of the jet radius and threshold logarithms are resummed to next-to-leading logarithmic (NLL′) accuracy. By calculating the mean of the leading jet distribution, we are able to quantify the average out-of-jet radiation, the so-called jet energy loss. When an additional reference scale is measured, we are able to determine the energy loss of leading jets at the cross section level which is identical to parton energy loss at leading-logarithmic accuracy. We identify several suitable cross sections for an extraction of the jet energy loss and we present numerical results for leading subjets at the LHC. In addition, we consider hemisphere and event-wide leading jets in electron-positron annihilation similar to measurements performed at LEP. Besides the average energy loss, we also consider its variance and other statistical quantities such as the KL divergence which quantifies the difference between quark and gluon jet energy loss. We expect that our results will be particularly relevant for quantifying the energy loss of quark and gluon jets that propagate through hot or cold nuclear matter.

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“…New measurements of the absolute level of jet suppression and its p T dependence will directly test models and serve as a key constraint for global analyses of high-p T observables. Additionally, the evolution of jet suppression with the jet resolution parameter, R, can constrain competing effects between the recovery of out-ofcone radiation and the changing selection of the jet population (such as reduction of the quark/gluon fraction) as R increases [23][24][25].…”

mentioning

confidence: 99%

Measurements of inclusive jet spectra in pp and central Pb-Pb collisions at sNN=5.02TeV

Acharya¹,

Adamová²,

Adler³

et al. 2020

Phys. Rev. C

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This article reports measurements of the p T -differential inclusive jet cross section in pp collisions at √ s = 5.02 TeV and the p T -differential inclusive jet yield in Pb-Pb 0-10% central collisions at √ s NN = 5.02 TeV. Jets were reconstructed at midrapidity with the ALICE tracking detectors and electromagnetic calorimeter using the anti-k T algorithm. For pp collisions, we report jet cross sections for jet resolution parameters R = 0.1-0.6 over the range 20 < p T,jet < 140 GeV/c, as well as the jet cross-section ratios of different R and comparisons to two next-to-leading-order (NLO)-based theoretical predictions. For Pb-Pb collisions, we report the R = 0.2 and R = 0.4 jet spectra for 40 < p T,jet < 140 GeV/c and 60 < p T,jet < 140 GeV/c, respectively. The scaled ratio of jet yields observed in Pb-Pb to pp collisions, R AA , is constructed, and exhibits strong jet quenching and a clear p T dependence for R = 0.2. No significant R dependence of the jet R AA is observed within the uncertainties of the measurement. These results are compared to several theoretical predictions.

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Factorization of Jet Cross Sections in Heavy-Ion Collisions

Cited by 44 publications

References 80 publications

First measurement of large area jet transverse momentum spectra in heavy-ion collisions

First measurement of large area jet transverse momentum spectra in heavy-ion collisions

Leading jets and energy loss

Measurements of inclusive jet spectra in pp and central Pb-Pb collisions at sNN=5.02TeV

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