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

J. Adam, D. Adamová, M. M. Aggarwal, G. Aglieri Rinella, M. Agnello, N. Agrawal, Z. Ahammed, S. Ahmad, S. U. Ahn, S. Aiola, A. Akindinov, S. N. Alam, D. S.D. Albuquerque, D. Aleksandrov, B. Alessandro, D. Alexandre, R. Alfaro Molina, A. Alici, A. Alkin, J. AlmeT. Alt, S. Altinpinar, I. Altsybeev, C. Alves Garcia Prado, M. An, C. Andrei, H. A. Andrews, A. Andronic, V. Anguelov, C. Anson, T. Antičić, F. Antinori, P. Antonioli, R. Anwar, L. Aphecetche, H. Appelshäuser, S. Arcelli, R. Arnaldi, O. W. Arnold, I. C. Arsene, M. Arslandok, B. Audurier, A. Augustinus, R. Averbeck, G. Feofilov, V. Kondratiev, V. Kovalenko, V. Vechernin, L. Vinogradov, A. Zarochentsev, ALICE Collaboration

Результат исследований: Научные публикации в периодических изданияхстатья

6 Цитирования (Scopus)

Аннотация

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.

Язык оригиналаанглийский
Номер статьи034904
ЖурналPhysical Review C
Том96
Номер выпуска3
DOI
СостояниеОпубликовано - 8 сен 2017

Предметные области Scopus

  • Ядерная физика и физика высоких энергий

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  • Цитировать

    Adam, J., Adamová, D., Aggarwal, M. M., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., Ahn, S. U., Aiola, S., Akindinov, A., Alam, S. N., Albuquerque, D. S. D., Aleksandrov, D., Alessandro, B., Alexandre, D., Alfaro Molina, R., Alici, A., Alkin, A., ... ALICE Collaboration (2017). Evolution of the longitudinal and azimuthal structure of the near-side jet peak in Pb-Pb collisions at sNN =2.76 TeV. Physical Review C, 96(3), [034904]. https://doi.org/10.1103/PhysRevC.96.034904