Jet tomography in high-energy nuclear collisions

Zhang, Ben-Wei; Ma, Guoyang; Dai, Wei; Wang, Sa; Zhang, Shan-Liang

doi:10.1051/epjconf/201920604004

Cited by 3 publications

(1 citation statement)

References 43 publications

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“…High-energy nuclear collisions at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) provide an excellent arena to unravel the properties of quark-gluon plasma (QGP), a new state of nuclear matter with de-confined quarks and gluons, which is predicted to be formed in extreme hot and dense system by quantum chromodynamics (QCD), the fundamental theory of strong interaction. In the past few decades, the "jet quenching" phenomenon, the energy loss of the initially produced energic jet due to strong interactions with the constituents of QGP has garnered great interest from physicists and has been extensively studied [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. These studies show that the differences between the final-state observables at large transverse momentum, such as leading hadron spectra and jet production, in p+p and A+A collisions can help us gain insight into the mechanisms of in-medium parton interactions and precisely extract valuable information on the properties of QGP created in relativistic heavy-ion collisions.…”

Section: Introductionmentioning

confidence: 99%

Radial profile of bottom quarks in jets in high-energy nuclear collisions *

et al. 2021

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Angular correlations between heavy quark (HQ) and its tagged jet are potentially new tools to gain insight into the in-medium partonic interactions in relativistic heavy-ion collisions. In this work, we present the first theoretical study on the radial profiles of B mesons in jets in Pb+Pb collisions at the LHC. The initial production of bottom quark tagged jet in p+p is computed by SHERPA which matches the next-to-leading order matrix elements with contributions of parton shower, whereas the massive quark traversing the QGP described by a Monte Carlo model SHELL which can simultaneously simulate light and heavy flavor in-medium energy loss within the framework of Langevin evolution. In p+p collisions, we find that at lower p Q T the radial profiles of heavy flavors in jets are sensitive to the heavy quark mass. In 0 − 10% Pb+Pb collisions at √ sNN = 5.02 TeV, we observe an inverse modification pattern of the B mesons radial profiles in jets at 4 < p Q T < 20 GeV compared to that of D mesons: the jet quenching effects narrow the jet radial profile of B mesons in jets while broaden that of D mesons in jets. We find that in A+A collisions, the contribution dissipated from the higher p Q T > 20 GeV region naturally has a narrower initial distribution and consequently leads to a narrower modification pattern of radial profile; however the diffusion nature of the heavy flavor in-medium interactions will give rise to a broader modification pattern of radial profile. These two effects consequently compete and offset with each other, and the b quarks in jets benefit more from the former and suffers less diffusion effect compared to that of c quarks in jets. These findings can be tested in the future experimental measurements at the LHC to gain better understanding of the mass effect of jet quenching.

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Section: Introductionmentioning

confidence: 99%

Radial profile of bottom quarks in jets in high-energy nuclear collisions *

et al. 2021

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Diffusion of charm quarks in jets in high-energy heavy-ion collisions

et al. 2019

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Heavy flavor physics in high-energy heavy-ion collisions is a promising and active area to study the mass dependence of the " jet quenching " effects both at the RHIC and the LHC. In this talk, we present the first theoretical study on the D 0 meson radial distributions relative to the jet axis both in p+p and Pb+Pb collisions at √ s NN = 5.02 TeV, where a nice agreement of our results with experimental data is observed. The in-medium parton propagations are described by a Monte Carlo transport model which uses the next-to-leading order (NLO) plus parton shower (PS) event generator SHERPA as input and includes elastic (collisional) and inelastic (radiative) in-medium interaction of heavy flavor jet. We find that, at low D 0 meson p T , the radial distribution significantly shifts to larger radius indicating a strong diffusion effect, and the diffusion effects decrease quickly with p T ,which is consistent with the recent CMS measurements. We demonstrate that the angular deviation of charm quarks is sensitive to D s but notq, which may provide new constrains on the collisional and radiative heavy quark energy loss.

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The global geometrical property of jet events in high-energy nuclear collisions

et al. 2020

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We present the first theoretical study of medium modifications of the global geometrical pattern, i.e., transverse sphericity ($$S_{\perp }$$ S ⊥ ) distribution of jet events with parton energy loss in relativistic heavy-ion collisions. In our investigation, POWHEG + PYTHIA is employed to make an accurate description of transverse sphericity in the p + p baseline, which combines the next-to-leading order (NLO) pQCD calculations with the matched parton shower (PS). The Linear Boltzmann Transport (LBT) model of the parton energy loss is implemented to simulate the in-medium evolution of jets. We calculate the event normalized transverse sphericity distribution in central Pb + Pb collisions at the LHC, and give its medium modifications. An enhancement of transverse sphericity distribution at small $$S_{\perp }$$ S ⊥ region but a suppression at large $$S_{\perp }$$ S ⊥ region are observed in A + A collisions as compared to their p + p references, which indicates that in overall the geometry of jet events in Pb + Pb becomes more pencil-like. We demonstrate that for events with 2 jets in the final-state of heavy-ion collisions, the jet quenching makes the geometry more sphere-like with medium-induced gluon radiation. However, for events with $$\ge 3$$ ≥ 3 jets, parton energy loss in the QCD medium leads to the events more pencil-like due to jet number reduction, where less energetic jets may lose their energies and then fall off the jet selection kinematic cut. These two effects offset each other and in the end result in more jetty events in heavy-ion collisions relative to that in p + p.

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Jet tomography in high-energy nuclear collisions

Cited by 3 publications

References 43 publications

Radial profile of bottom quarks in jets in high-energy nuclear collisions *

Radial profile of bottom quarks in jets in high-energy nuclear collisions *

Diffusion of charm quarks in jets in high-energy heavy-ion collisions

The global geometrical property of jet events in high-energy nuclear collisions

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