Longitudinal broadening of near-side jets due to parton cascade

L., G.; Zhang, S.; G., Y.; Xiang-Zhou, Cai; Chen, J. H.; Chen, Zhong

doi:10.1140/epjc/s10052-008-0691-6

Cited by 10 publications

(7 citation statements)

References 35 publications

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“…The ridge structure is a result of the longitudinal expansion of the anisotropic flows as pointed out previously in Ref. [27].…”

Section: Introductionsupporting

confidence: 53%

Higher-order anisotropic flows and dihadron correlations in Pb-Pb collisions atsNN=2.76TeV in a multiphase transport model

2011

Phys. Rev. C

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Using a multiphase transport model that includes both initial partonic and final hadronic scatterings, we have studied higher-order anisotropic flows as well as dihadron correlations as functions of pseudorapidity and azimuthal angular differences between trigger and associated particles in Pb-Pb collisions at √ sNN = 2.76 TeV. With parameters in the model determined previously from fitting the measured multiplicity density of mid-pseudorapidity charged particles in central collisions and their elliptic flow in mid-central collisions, the calculated higher-order anisotropic flows from the two-particle cumulant method reproduce approximately those measured by the ALICE Collaboration, except at small centralities where they are slightly overestimated. Similar to experimental results, the two-dimensional dihadron correlations at most central collisions show a ridge structure at the near side and a broad structure at the away side. The short-and long-range dihadron azimuthal correlations, corresponding to small and large pseudorapidity differences, respectively, are studied for triggering particles with different transverse momenta and are found to be qualitatively consistent with experimental results from the CMS Collaboration. The relation between the shortrange and long-range dihadron correlations with that induced by back-to-back jet pairs produced from initial hard collisions is also discussed.

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“…The ridge structure is a result of the longitudinal expansion of the anisotropic flows as pointed out previously in Ref. [27].…”

Section: Introductionsupporting

confidence: 53%

Higher-order anisotropic flows and dihadron correlations in Pb-Pb collisions atsNN=2.76TeV in a multiphase transport model

2011

Phys. Rev. C

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“…The model successfully describes main features of the dependence of elliptic flow on centrality and transverse momentum [40]. Ridge and broad away-side features in two-particle correlations are also observed in the AMPT model [48,49]. Furthermore, the dependence of quantitative observables such as awayside RMS width and away-side splitting parameter D on transverse momentum and reaction plane in AMPT reproduces the experimental results successfully, where a ZYAM-based elliptic flow subtraction is applied to both the data and the model [50,51].…”

Section: Triangular Flow In the Ampt Modelmentioning

confidence: 99%

Collision-geometry fluctuations and triangular flow in heavy-ion collisions

2010

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We introduce the concepts of participant triangularity and triangular flow in heavy-ion collisions, analogous to the definitions of participant eccentricity and elliptic flow. The participant triangularity characterizes the triangular anisotropy of the initial nuclear overlap geometry and arises from eventby-event fluctuations in the participant-nucleon collision points. In studies using a multi-phase transport model (AMPT), a triangular flow signal is observed that is proportional to the participant triangularity and corresponds to a large third Fourier coefficient in two-particle azimuthal correlation functions. Using two-particle azimuthal correlations at large pseudorapidity separations measured by the PHOBOS and STAR experiments, we show that this Fourier component is also present in data. Ratios of the second and third Fourier coefficients in data exhibit similar trends as a function of centrality and transverse momentum as in AMPT calculations. These findings suggest a significant contribution of triangular flow to the ridge and broad away-side features observed in data. Triangular flow provides a new handle on the initial collision geometry and collective expansion dynamics in heavy-ion collisions.

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“…Further studies on the possibility that the effect can be caused by an interplay of flow and jets have been done comparing the data to generator-level results from A Multi-Phase Transport (AMPT) model [40,41], which has been shown to feature a longitudinal broadening of the near-side peak [42]. Two mechanisms in AMPT produce collective effects: partonic and hadronic rescattering.…”

Section: B Model Comparisonmentioning

confidence: 99%

“…Reference [42] studied partonic pseudorapidity distributions at different evolution times in AMPT. The authors show that the longitudinal broadening is driven by large values of longitudinal flow.…”

Section: Figmentioning

confidence: 99%

Evolution of the longitudinal and azimuthal structure of the near-side jet peak in Pb-Pb collisions at sNN=2.76 TeV

Adam¹,

Adamová²,

Aggarwal³

et al. 2017

Phys. Rev. C

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In two-particle angular correlation measurements, jets give rise to a nearside peak, formed by particles associated to a higher-p T trigger particle. Measurements of these correlations as a function of pseudorapidity (η) and azimuthal (ϕ) differences are used to extract the centrality and p T dependence of the shape of the nearside peak in the p T range 1 < p T < 8 GeV/c in Pb-Pb and pp collisions at √ s NN = 2.76 TeV. A combined fit of the nearside peak and long-range correlations is applied to the data and the peak shape is quantified by the variance of the distributions. While the width of the peak in the ϕ direction is almost independent of centrality, a significant broadening in the η direction is found from peripheral to central collisions. This feature is prominent for the low-p T region and vanishes above 4 GeV/c. The widths measured in peripheral collisions are equal to those in pp collisions in the ϕ direction and above 3 GeV/c in the η direction. Furthermore, for the 10% most central collisions and 1 < p T,assoc < 2 GeV/c, 1 < p T,trig < 3 GeV/c, a departure from a Gaussian shape is found: a depletion develops around the center of the peak. The results are compared to A Multi-Phase Transport (AMPT) model simulation as well as other theoretical calculations indicating that the broadening and the development of the depletion are connected to the strength of radial and longitudinal flow.

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Longitudinal broadening of near-side jets due to parton cascade

Cited by 10 publications

References 35 publications

Higher-order anisotropic flows and dihadron correlations in Pb-Pb collisions atsNN=2.76TeV in a multiphase transport model

Higher-order anisotropic flows and dihadron correlations in Pb-Pb collisions atsNN=2.76TeV in a multiphase transport model

Collision-geometry fluctuations and triangular flow in heavy-ion collisions

Evolution of the longitudinal and azimuthal structure of the near-side jet peak in Pb-Pb collisions at sNN=2.76 TeV

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