Centrality dependence of pion freeze-out radii in Pb-Pb collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi mathvariant="italic">N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>2.76</mml:mn></mml:mrow></mml:math> TeV

Adam, J.; Antičić, T.; Erhardt, F.; Planinić, M.; Poljak, N.; Utrobicic, A.; Zyzak, M.

doi:10.1103/physrevc.93.024905

Cited by 47 publications

(41 citation statements)

References 60 publications

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“…The average radii obtained in this analysis are consistent with the results reported in Ref. [31]. As expected, the radii are larger in more central collisions and at smaller k T values, the latter reflecting the effect of radial flow [7,32].…”

supporting

confidence: 81%

“…Other than being differential in the event plane, this analysis is similar in most aspects to the analysis reported in [31], and further details can be found there. The results reported below were obtained with the second harmonic event plane [27] determined with the TPC tracks.…”

supporting

confidence: 58%

“…They include uncertainties related to the tracking efficiency and track quality, momentum resolution [31], different pair cuts (Δφ Ã and Δη), and correlation function fit ranges. Positive and negative pion pairs, as well as data obtained with two opposite magnetic field polarities of the ALICE L3 magnet, have been analyzed separately and a small difference in the results (less than 3%) has been also accounted for in the systematic error.…”

mentioning

confidence: 99%

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Azimuthally Differential Pion Femtoscopy in Pb-Pb Collisions at sNN=2.76 TeV

Adamová¹,

Aggarwal²,

Rinella³

et al. 2017

Phys. Rev. Lett.

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We present the first azimuthally differential measurements of the pion source size relative to the second harmonic event plane in Pb-Pb collisions at a center-of-mass energy per nucleon-nucleon pair of ffiffiffiffiffiffiffiffi s NN p ¼ 2.76 TeV. The measurements have been performed in the centrality range 0%-50% and for pion pair transverse momenta 0.2 < k T < 0.7 GeV=c. We find that the R side and R out radii, which characterize the pion source size in the directions perpendicular and parallel to the pion transverse momentum, oscillate out of phase, similar to what was observed at the Relativistic Heavy Ion Collider. The final-state source eccentricity, estimated via R side oscillations, is found to be significantly smaller than the initial-state source eccentricity, but remains positive-indicating that even after a stronger expansion in the in-plane direction, the pion source at the freeze-out is still elongated in the out-of-plane direction. The 3 þ 1D hydrodynamic calculations are in qualitative agreement with observed centrality and transverse momentum R side oscillations, but systematically underestimate the oscillation magnitude.

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supporting

confidence: 81%

supporting

confidence: 58%

mentioning

confidence: 99%

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Azimuthally Differential Pion Femtoscopy in Pb-Pb Collisions at sNN=2.76 TeV

Adamová¹,

Aggarwal²,

Rinella³

et al. 2017

Phys. Rev. Lett.

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“…This effect appears to be stronger at LHC energies than at RHIC energies [35,36]. It was studied by the ALICE collaboration for pions in Pb-Pb collisions at 2.76 TeV [19] at different centralities. This work extends this study to kaons and compares the obtained transverse radii with those found in the analysis for pions and to the model calculations discussed above.…”

Section: Introductionmentioning

confidence: 99%

“…ALICE has excellent capabilities to study femtoscopy observables due to good track-by-track particle identification (PID), particle acceptance down to low transverse momenta p T , and good resolution of secondary vertices. We already studied pion correlation radii in Pb-Pb collisions at 2.76 TeV [9,19]. Pion femtoscopy showed genuine effects originating from collective flow in heavy-ion collisions, manifesting as a decrease of the source radii with increasing pair transverse mass m T = (k 2 T + m 2 ) 1/2 [14,20], where k T = |p T,1 + p T,2 |/2 is the average transverse momentum of the corresponding pair and m is the particles mass.…”

Section: Introductionmentioning

confidence: 99%

Kaon femtoscopy in Pb-Pb collisions at sNN=2.76 TeV

Acharya¹,

Adam²,

Adamová³

et al. 2017

Phys. Rev. C

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We present the results of three-dimensional femtoscopic analyses for charged and neutral kaons recorded by ALICE in Pb-Pb collisions at √ s NN = 2.76 TeV. Femtoscopy is used to measure the space-time characteristics of particle production from the effects of quantum statistics and final-state interactions in two-particle correlations. Kaon femtoscopy is an important supplement to that of pions because it allows one to distinguish between different model scenarios working equally well for pions. In particular, we compare the measured three-dimensional kaon radii with a purely hydrodynamical calculation and a model where the hydrodynamic phase is followed by a hadronic rescattering stage. The former predicts an approximate transverse mass (m T ) scaling of source radii obtained from pion and kaon correlations. This m T scaling appears to be broken in our data, which indicates the importance of the hadronic rescattering phase at LHC energies. A k T scaling of pion and kaon source radii is observed instead. The time of maximal emission of the system is estimated by using the three-dimensional femtoscopic analysis for kaons. The measured emission time is larger than that of pions. Our observation is well supported by the hydrokinetic model predictions.

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Event-shape and multiplicity dependence of freeze-out radii in pp collisions at $$ \sqrt{s} $$ = 7 TeV

Acharya

Adamová

Adhya

et al. 2019

J. High Energ. Phys.

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Two-particle correlations in high-energy collision experiments enable the extraction of particle source radii by using the Bose-Einstein enhancement of pion production at low relative momentum q ∝ 1/R. It was previously observed that in pp collisions at √ s = 7 TeV the average pair transverse momentum k T range of such analyses is limited due to large background correlations which were attributed to mini-jet phenomena. To investigate this further, an event-shape dependent analysis of Bose-Einstein correlations for pion pairs is performed in this work. By categorizing the events by their transverse sphericity S T into spherical (S T > 0.7) and jet-like (S T < 0.3) events a method was developed that allows for the determination of source radii for much larger values of k T for the first time. Spherical events demonstrate little or no background correlations while jet-like events are dominated by them. This observation agrees with the hypothesis of a mini-jet origin of the non-femtoscopic background correlations and gives new insight into the physics interpretation of the k T dependence of the radii. The emission source size in spherical events shows a substantially diminished k T dependence, while jet-like events show indications of a negative trend with respect to k T in the highest multiplicity events. Regarding the emission source shape, the correlation functions for both event sphericity classes show good agreement with an exponential shape, rather than a Gaussian one.

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Centrality dependence of pion freeze-out radii in Pb-Pb collisions atsNN=2.76 TeV

Cited by 47 publications

References 60 publications

Azimuthally Differential Pion Femtoscopy in Pb-Pb Collisions at sNN=2.76 TeV

Azimuthally Differential Pion Femtoscopy in Pb-Pb Collisions at sNN=2.76 TeV

Kaon femtoscopy in Pb-Pb collisions at sNN=2.76 TeV

Event-shape and multiplicity dependence of freeze-out radii in pp collisions at $$ \sqrt{s} $$ = 7 TeV

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