Abstract
In two-particle angular correlation measurements, jets give rise to a near-side peak, formed by particles associated to a higher-pT trigger particle. Measurements of these correlations as a function of pseudorapidity (Δη) and azimuthal (Δφ) differences are used to extract the centrality and pT dependence of the shape of the near-side peak in the pT range 1<pT<8 GeV/c in Pb-Pb and pp collisions at sNN = 2.76 TeV. A combined fit of the near-side 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 Δφ direction is almost independent of centrality, a significant broadening in the Δη direction is found from peripheral to central collisions. This feature is prominent for the low-pT region and vanishes above 4 GeV/c. The widths measured in peripheral collisions are equal to those in pp collisions in the Δφ direction and above 3 GeV/c in the Δη direction. Furthermore, for the 10% most central collisions and 1<pT,assoc< 2 GeV/c, 1<pT,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.
| Original language | English (US) |
|---|---|
| Article number | 034904 |
| Journal | Physical Review C |
| Volume | 96 |
| Issue number | 3 |
| DOIs | |
| State | Published - Sep 8 2017 |
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All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
Cite this
Evolution of the longitudinal and azimuthal structure of the near-side jet peak in Pb-Pb collisions at sNN =2.76 TeV. / ALICE Collaboration.
In: Physical Review C, Vol. 96, No. 3, 034904, 08.09.2017.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Evolution of the longitudinal and azimuthal structure of the near-side jet peak in Pb-Pb collisions at sNN =2.76 TeV
AU - ALICE Collaboration
AU - Adam, J.
AU - Adamová, D.
AU - Aggarwal, M. M.
AU - Aglieri Rinella, G.
AU - Agnello, M.
AU - Agrawal, N.
AU - Ahammed, Z.
AU - Ahmad, S.
AU - Ahn, S. U.
AU - Aiola, S.
AU - Akindinov, A.
AU - Alam, S. N.
AU - Albuquerque, D. S.D.
AU - Aleksandrov, D.
AU - Alessandro, B.
AU - Alexandre, D.
AU - Alfaro Molina, R.
AU - Alici, A.
AU - Alkin, A.
AU - Alme, J.
AU - Alt, T.
AU - Altinpinar, S.
AU - Altsybeev, I.
AU - Alves Garcia Prado, C.
AU - An, M.
AU - Andrei, C.
AU - Andrews, H. A.
AU - Andronic, A.
AU - Anguelov, V.
AU - Anson, C.
AU - Antičić, T.
AU - Antinori, F.
AU - Antonioli, P.
AU - Anwar, R.
AU - Aphecetche, L.
AU - Appelshäuser, H.
AU - Arcelli, S.
AU - Arnaldi, R.
AU - Arnold, O. W.
AU - Arsene, I. C.
AU - Arslandok, M.
AU - Audurier, B.
AU - Augustinus, A.
AU - Averbeck, R.
AU - Azmi, M. D.
AU - Badalà, A.
AU - Baek, Y. W.
AU - Bagnasco, S.
AU - Cherney, Michael G.
AU - Seger, Janet E.
PY - 2017/9/8
Y1 - 2017/9/8
N2 - In two-particle angular correlation measurements, jets give rise to a near-side peak, formed by particles associated to a higher-pT trigger particle. Measurements of these correlations as a function of pseudorapidity (Δη) and azimuthal (Δφ) differences are used to extract the centrality and pT dependence of the shape of the near-side peak in the pT range 1
AB - In two-particle angular correlation measurements, jets give rise to a near-side peak, formed by particles associated to a higher-pT trigger particle. Measurements of these correlations as a function of pseudorapidity (Δη) and azimuthal (Δφ) differences are used to extract the centrality and pT dependence of the shape of the near-side peak in the pT range 1
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U2 - 10.1103/PhysRevC.96.034904
DO - 10.1103/PhysRevC.96.034904
M3 - Article
VL - 96
JO - Physical Review C
JF - Physical Review C
SN - 2469-9985
IS - 3
M1 - 034904
ER -