The Z^0-tagged jet event asymmetry in heavy-ion collisions at the CERN Large Hadron Collider

Neufeld, R. B.; Vitev, I.

doi:10.48550/arxiv.1202.5556

Cited by 8 publications

(11 citation statements)

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“…Such final-state hot medium effects include radiative energy loss, caused by medium-induced parton splitting, as well as the dissipation of the energy of the parton shower through collisional interactions in the strongly interacting plasma [36,37]. The medium-modified γ+b-jet cross section per binary nucleon-nucleon scattering is calculated as follows [20,38,39]:…”

Section: Modification Of Tagged B-jet Production In Dense Qcd Mattermentioning

confidence: 99%

Photon-tagged and B-meson-tagged b-jet production at the LHC

et al. 2015

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Tagged jet measurements in high energy hadronic and nuclear reactions provide constraints on the energy and parton flavor origin of the parton shower that recoils against the tagging particle. Such additional insight can be especially beneficial in illuminating the mechanisms of heavy flavor production in proton-proton collisions at the LHC and their modification in the heavy ion environment, which are not fully understood. With this motivation, we present theoretical results for isolated-photon-tagged and B-meson-tagged b-jet production at center-of-mass energy 5.1 TeV for comparison to the upcoming lead-lead data. We find that photon-tagged b-jets exhibit smaller momentum imbalance shift in nuclear matter, and correspondingly smaller energy loss, than photon-tagged light flavor jets. Our results show that B-meson tagging is most effective in ensuring that the dominant fraction of recoiling jets originate from prompt b-quarks. Interestingly, in this channel the large suppression of the cross section is not accompanied by a significant momentum imbalance shift.Comment: 9 pages, 6 figures, 1 table; typos in text fixed, extended discussion adde

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Section: Modification Of Tagged B-jet Production In Dense Qcd Mattermentioning

confidence: 99%

Photon-tagged and B-meson-tagged b-jet production at the LHC

et al. 2015

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“…To investigate jet production in the nuclear environment and infer the properties of the QGP, it is important to place constraints on the magnitude of the parton shower energy in the medium [11]. Electroweak vector bosons, such as Z 0 , W ± and γ, produced in conjunction with jets can provide such constraints on average [7,8,14]. For example, in Z 0 -tagged jet production at leading-order obeys the relation p T jet = p T,Z 0 .…”

Section: Tagged Jet Production In Hicmentioning

confidence: 99%

“…Recently the first O(G F α 2 s ) calculations on Z 0 /γ * -tagged jet production and event asymmetry in HIC with finalstate parton energy loss effect have been done [7,8]. This approach has been extended to study isolated-photon tagged jets in A+A collisions at O(α em α 2 s ) [14].…”

Section: Tagged Jet Production In Hicmentioning

confidence: 99%

“…We observe that with jet-medium interaction the tagged jet A J distributions in Pb+Pb reactions are significantly broader and shifted to A J > 0. The underlying physics mechanism is medium-induced parton splitting: energy is lost due to large-angle radiation out of the jet reconstruction parameter R. Consequently, the smaller the jet radius, the larger the width and the average asymmetry of these distributions will be [8] .…”

Section: Tagged Jet Production In Hicmentioning

confidence: 99%

“…In this manuscript we discuss the modification of jet production in relativistic heavy-ion reactions. We include selected results for inclusive jet productions [5,6], Z 0 /γ * -tagged jet cross sections [7,8] and the dijet transverse momentum imbalance [6,9,10] in high-energy nuclear collisions. Our theoretical simulations will be compared with experimental data on jets when available, and predictions for future measurement are also presented.…”

Section: Introductionmentioning

confidence: 99%

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Probing nuclear matter with jets

Zhang

Neufeld

et al. 2013

Nuclear Physics A

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Jet physics in relativistic heavy ion collisions, which combines perturbative QCD jet production with quark and gluon energy loss and in-medium parton shower modification, has emerged as a powerful tool to probe the properties of strongly-interacting matter formed in high-energy nuclear reactions. We present selected results for the modification of jet cross sections and related observables in the ambiance of hot and/or dense nuclear medium. We focus on the inclusive jet spectrum and dijets [${\cal O}(\alpha_s^3) $], and $Z^0/\gamma^*$ tagged jets [${\cal O}(G_F\alpha_s^2) $] in the framework of perturbative QCD.Comment: talk given at the 5th international conference on Hard and Electromagnetic Probes of High Energy nuclear Collisions (Hard Probes 2012), May 27th - June 1st, Caglirai (Italy), 4 pages, 4 figure

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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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The Z^0-tagged jet event asymmetry in heavy-ion collisions at the CERN Large Hadron Collider

Cited by 8 publications

References 0 publications

Photon-tagged and B-meson-tagged b-jet production at the LHC

Photon-tagged and B-meson-tagged b-jet production at the LHC

Probing nuclear matter with jets

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

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