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

Jasmine Brewer¹,
Quinn Brodsky² &
Krishna Rajagopal³

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15 Citations
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A preprint version of the article is available at arXiv.

Abstract

The selection of jets in heavy-ion collisions based on their p_T 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) p_T have substantially smaller fractional energy loss than those selected based on the p_T 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 p_T 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 p_T, 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 p_T or the Z-boson p_T 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 p_T yields a ∆R distribution that appears almost unmodified whereas selecting Z+jet events based upon the Z-boson p_T 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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Angular structure of jet quenching within a hybrid strong/weak coupling model

Article Open access 27 March 2017

Medium modification of the shape of small-radius jets in central Pb-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=2.76 \) TeV

Article Open access 22 October 2018

Modification of jet substructure in heavy ion collisions as a probe of the resolution length of quark-gluon plasma

Article Open access 08 January 2020

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Theoretical Physics Department, CERN, CH-1211, Genève 23, Switzerland
Jasmine Brewer
Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, USA
Quinn Brodsky
Center for Theoretical Physics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, USA
Krishna Rajagopal

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Jasmine Brewer
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Brewer, J., Brodsky, Q. & Rajagopal, K. Disentangling jet modification in jet simulations and in Z+jet data. J. High Energ. Phys. 2022, 175 (2022). https://doi.org/10.1007/JHEP02(2022)175

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Received: 01 November 2021
Revised: 28 January 2022
Accepted: 05 February 2022
Published: 21 February 2022
DOI: https://doi.org/10.1007/JHEP02(2022)175

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

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

Medium modification of the shape of small-radius jets in central Pb-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=2.76 \) TeV

Modification of jet substructure in heavy ion collisions as a probe of the resolution length of quark-gluon plasma

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

Abstract

Article PDF

Similar content being viewed by others

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

Medium modification of the shape of small-radius jets in central Pb-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=2.76 \) TeV

Modification of jet substructure in heavy ion collisions as a probe of the resolution length of quark-gluon plasma

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