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

Adam, J.; Adamová, D.; Aggarwal, M. M.; Rinella, G. Aglieri; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahmad, S.; Ahn, S. U.; Aiola, S.; Alme, J.; Altinpinar, S.; Djuvsland, Ø.; Lønne, Per-Ivar; Nystrand, J.; Rehman, A.; Röhrich, D.; Tambave, Ganesh Jagannath; Ullaland, K.; Velure, A.; Wagner, B.; Zhang, Hui; Zhou, Zhuo; Zhu, H.; Helstrup, H.; Hetland, Kristin Fanebust; Arsene, I. C.; Paul, B.; Dordic, O.; Lindal, S.; Mahmood, S. M.; Milošević, J.; Qvigstad, H.; Richter, Matthias; Røed, K.; Skaali, T. B.; Tveter, Trine Spedstad; Wikne, J.; Zhao, C.; Langoy, R.; Lien, J.; Akindinov, A.; Alam, Sk Noor; Albuquerque, D. S. D.; Aleksandrov, D.; Alessandro, B.; Alexandre, D.; Molina, José Rubén Alfaro; Alici, A.

doi:10.1103/physrevc.96.034904

Cited by 10 publications

(5 citation statements)

References 55 publications

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“…This correction is never larger than 2% and only affects the h-h correlation function. A similar effect was observed also in a previous analysis [31].…”

Section: Correctionssupporting

confidence: 91%

$$\mathrm {K_S}^{0}$$- and (anti-)$$\Lambda $$-hadron correlations in pp collisions at $${\sqrt{s}} = 13$$ TeV

et al. 2021

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Two-particle Azimuthal correlations are measured with the ALICE apparatus in pp collisions at $$\sqrt{s} = 13$$ s = 13 TeV to explore strangeness- and multiplicity-related effects in the fragmentation of jets and the transition regime between bulk and hard production, probed with the condition that a strange meson ($$\mathrm {K_S}^{0}$$ K S 0 ) or baryon ($$\Lambda $$ Λ ) with transverse momentum $$p_{\mathrm T} >3$$ p T > 3 GeV/$$c$$ c is produced. Azimuthal correlations between kaons or $$\Lambda $$ Λ hyperons with other hadrons are presented at midrapidity for a broad range of the trigger ($$3< p_\mathrm {T}^\mathrm {trigg} < 20$$ 3 < p T trigg < 20 GeV/$$c$$ c ) and associated particle $$p_{\mathrm T}$$ p T (1 GeV/$$c$$ c $$< p_\mathrm {T}^\mathrm {assoc} < p_\mathrm {T}^\mathrm {trigg} $$ < p T assoc < p T trigg ), for minimum-bias events and as a function of the event multiplicity. The near- and away-side peak yields are compared for the case of either $$\mathrm {K_S}^{0}$$ K S 0 or $$\Lambda $$ Λ ($${\overline{\Lambda }}$$ Λ ¯ ) being the trigger particle with that of inclusive hadrons (a sample dominated by pions). In addition, the measurements are compared with predictions from PYTHIA 8 and EPOS LHC event generators.

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“…This correction is never larger than 2% and only affects the h-h correlation function. A similar effect was observed also in a previous analysis [31].…”

Section: Correctionssupporting

confidence: 91%

$$\mathrm {K_S}^{0}$$- and (anti-)$$\Lambda $$-hadron correlations in pp collisions at $${\sqrt{s}} = 13$$ TeV

et al. 2021

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“…The data is divided into five centrality classes according to the signal amplitude in the V0 [10]. More details about the event and track selection can be found elsewhere [7,8].…”

Section: Discussionmentioning

confidence: 99%

“…Particles originating from γ conversions are also removed by an invariant mass cut. The exact details of the cuts can be found in [7,8].…”

Section: Discussionmentioning

confidence: 99%

“…To study the observed effects in the context of flow, the radial expansion velocity (β T ) and the elliptic flow coefficient (v 2 {2}) are extracted from the data and the AMPT samples. For the extracted values the reader is referred to [7,8]. Elliptic flow is quite well described by AMPT; however, β T is underestimated by the model for all studied settings.…”

Section: Discussionmentioning

confidence: 99%

“…In the present contribution, an extension of these measurements to LHC energies by the ALICE detector is discussed. The full details of the presented analysis can be found in [7,8].…”

mentioning

confidence: 99%

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Near-side jet peak broadening in Pb–Pb collisions atsNN=2.76 TeV

Kofarago¹

2017

Nuclear and Particle Physics Proceedings

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Two-particle angular correlation measurements are sensitive probes of the interactions of particles with the medium formed in heavy-ion collisions. Such measurements are done by determining the distribution of the relative pseudorapidity (∆η) and azimuthal angle (∆ϕ) of particles with respect to a higher p T trigger particle (1 < p T,trig < 8 GeV/c). The near-side peak is fitted with a function, which includes both the near-side jet peak and also accounts for the ∆η-independent long-range correlations. The centrality evolution of the width (variance) of the fitted distribution is investigated. In Pb-Pb collisions a significant broadening of the near-side peak in the ∆η direction is observed from peripheral to central collisions, while in the ∆ϕ direction the peak is almost independent of centrality. For the 10% most central events, a departure from the Gaussian shape is also observed at low transverse momentum (1 < p T,assoc < 2 GeV/c, 1 < p T,trig < 3 GeV/c). In this contribution the results obtained by the ALICE experiment in Pb-Pb and pp collisions at √ s NN = 2.76 TeV are shown, and they are interpreted in terms of radial and elliptic flow by comparing them to AMPT model simulations.Keywords: Angular correlations, two-particle correlations, near-side peak, Pb-Pb, 2.76 TeV, ALICE MotivationIn high-energy collisions, the scattered high p T partons produce parton showers, which hadronize into collimated jets of hadrons. As the partons propagate through the expanding medium, they lose energy by medium induced gluon radiation and elastic scatterings, which is commonly referred to as jet quenching. This can result in the energy imbalance of back to back jets, with the radiated energy reappearing at large angles from the jet axis [1,2].At low p T , jets are difficult to identify in the large fluctuating background, and instead statistical analysis techniques are used to study the interaction of the propagating partons with the medium. One such technique is the measurement of two-particle angular correlations, where the distribution of the azimuthal angle difference Email address: monika.kofarago@cern.ch (Monika Kofarago) 1 for the ALICE collaboration 2 CERN and MTA Wigner RCP (∆ϕ) and pseudorapidity difference (∆η) is studied on a statistical basis. In these measurements jets manifest themselves as a peak around (∆ϕ, ∆η) = (0, 0) on the near-side, while as an approximately ∆η independent structure on the away-side (around ∆ϕ = π). The interaction of jets with the medium can modify the shape of the near-side jet peak [3,4,5], and such a centrality dependent broadening was seen by the STAR collaboration in Au-Au collisions atIn the present contribution, an extension of these measurements to LHC energies by the ALICE detector is discussed. The full details of the presented analysis can be found in [7,8]. AnalysisIn the current analysis Pb-Pb and pp data at √ s NN = 2.76 TeV recorded by the ALICE detector [9] are studied. The Inner Tracking System (ITS) and the Time Projection Chamber (TPC) are used for trac...

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The evolution of the near-side peak in two-particle number and transverse momentum correlations in Pb–Pb collisions from ALICE

Varga-Kőfaragó¹,

Acharya

Acosta³

et al. 2019

Nuclear Physics A

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Two-particle number and transverse momentum correlations are powerful tools for studying the medium produced in heavy-ion collisions. Correlations in the angular separation of pairs of hadrons can provide information on the medium transport characteristics. In particular, the transverse momentum correlations are sensitive to momentum currents, and provide information about the system life time, the shear viscosity over entropy density ratio (η/s) and the system relaxation time (τ π ). Furthermore, the interaction of the jets produced in the initial stages of a collision can be studied using number correlations, by observing the medium-induced modification of the near-side jet peak. Measurements of both sets of correlations from Pb-Pb collisions are reported as a function of centrality. Theoretical interpretations and results from Monte Carlo generators are then confronted with the experimental data.

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

Cited by 10 publications

References 55 publications

$$\mathrm {K_S}^{0}$$- and (anti-)$$\Lambda $$-hadron correlations in pp collisions at $${\sqrt{s}} = 13$$ TeV

$$\mathrm {K_S}^{0}$$- and (anti-)$$\Lambda $$-hadron correlations in pp collisions at $${\sqrt{s}} = 13$$ TeV

Near-side jet peak broadening in Pb–Pb collisions atsNN=2.76 TeV

The evolution of the near-side peak in two-particle number and transverse momentum correlations in Pb–Pb collisions from ALICE

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