Harmonic decomposition of two particle angular correlations in Pb-Pb collisions at root s(NN)=2.76 TeV

Aamodt, K.; Abelev, B.; Abrahantes Quintana, A.; Adamova, D.; Adare, A. M.; Aggarwal, M. M.; Rinella, G. Aglieri; Agocs, A. G.; Agostinelli, A.; Aguilar Salazar, S.; Ahammed, Z.; Ahmad, N.; Masoodi, A. Ahmad; Ahn, S. U.; Akindinov, A.; Aleksandrov, D.; Alessandro, B.; Molina, R. Alfaro; Alici, A.; Alkin, A.; Almaraz Avina, E.; Alme, J.; Alt, T.; Altini, V.; Altinpinar, S.; Altsybeev, I.; Andrei, C.; Andronic, A.; Anguelov, V.; Anielski, J.; Anticic, T.; Antinori, F.; Antonioli, P.; Aphecetche, L.; Appelshaeuser, H.; Arbor, N.; Arcelli, S.; Arend, A.; Armesto, N.; Arnaldi, R.; Aronsson, T.; Arsene, I. C.; Arslandok, M.; Asryan, A.; Augustinus, A.; Averbeck, R.; Awes, T. C.; Aysto, J.; Azmi, M. D.; Bach, M.

Harmonic decomposition of two particle angular correlations in Pb-Pb collisions at root s(NN)=2.76 TeV

Mark

Aamodt, K. ; Abelev, B. ; Abrahantes Quintana, A. ; Adamova, D. ; Adare, A. M. ; Aggarwal, M. M. ; Rinella, G. Aglieri ; Agocs, A. G. ; Agostinelli, A. and Aguilar Salazar, S. , et al. (2012) In Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics 708(3-5). p.249-264

Abstract: Angular correlations between unidentified charged trigger (t) and associated (a) particles are measured by the ALICE experiment in Pb-Pb collisions at root s(NN) = 2.76 TeV for transverse momenta 0.25 < p(T)(t,a) < 15 GeV/c, where p(T)(t) > p(T)(a). The shapes of the pair correlation distributions are studied in a variety of collision centrality classes between 0 and 50% of the total hadronic cross section for particles in the pseudorapidity interval |eta| < 1.0. Distributions in relative azimuth Delta phi equivalent to phi(t) - phi(a) are analyzed for |Delta eta| equivalent to |eta(t) - eta(a)| > 0.8, and are referred to as "long-range correlations". Fourier components V-n Delta equivalent to < cos(n Delta phi)> are... (More); Angular correlations between unidentified charged trigger (t) and associated (a) particles are measured by the ALICE experiment in Pb-Pb collisions at root s(NN) = 2.76 TeV for transverse momenta 0.25 < p(T)(t,a) < 15 GeV/c, where p(T)(t) > p(T)(a). The shapes of the pair correlation distributions are studied in a variety of collision centrality classes between 0 and 50% of the total hadronic cross section for particles in the pseudorapidity interval |eta| < 1.0. Distributions in relative azimuth Delta phi equivalent to phi(t) - phi(a) are analyzed for |Delta eta| equivalent to |eta(t) - eta(a)| > 0.8, and are referred to as "long-range correlations". Fourier components V-n Delta equivalent to < cos(n Delta phi)> are extracted from the long-range azimuthal correlation functions. If particle pairs are correlated to one another through their individual correlation to a common symmetry plane, then the pair anisotropy V-n Delta (p(T)(t), p(T)(a)) is fully described in terms of single-particle anisotropies v(n)(p(T)) as V-n Delta(p(T)(t), p(T)(a)) = v(n)(p(T)(t))v(n)(p(T)(a)). This expectation is tested for 1 <= n <= 5 by applying a global fit of all V-n Delta(p(T)(t), p(T)(a)) to obtain the best values v(n){GF}(p(T)). It is found that for 2 <= n <= 5, the fit agrees well with data up to p(T)(a) similar to 3-4 GeV/c, with a trend of increasing deviation as p(T)(t) and p(T)(a) are increased or as collisions become more peripheral. This suggests that no pair correlation harmonic can be described over the full 0.25 < p(T) < 15 GeV/c range using a single v(n)(p(T)) curve: such a description is however approximately possible for 2 <= n <= 5 when p(T)(a) < 4 GeV/c. For the n = 1 harmonic, however, a single v(1)(p(T)) curve is not obtained even within the reduced range p(T)(a) < 4 GeV/c. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved. (Less)

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author

Aamodt, K. ; Abelev, B. ; Abrahantes Quintana, A. ; Adamova, D. ; Adare, A. M. ; Aggarwal, M. M. ; Rinella, G. Aglieri ; Agocs, A. G. ; Agostinelli, A. and Aguilar Salazar, S. , et al. (More)

Aamodt, K. ; Abelev, B. ; Abrahantes Quintana, A. ; Adamova, D. ; Adare, A. M. ; Aggarwal, M. M. ; Rinella, G. Aglieri ; Agocs, A. G. ; Agostinelli, A. ; Aguilar Salazar, S. ; Ahammed, Z. ; Ahmad, N. ; Masoodi, A. Ahmad ; Ahn, S. U. ; Akindinov, A. ; Aleksandrov, D. ; Alessandro, B. ; Molina, R. Alfaro ; Alici, A. ; Alkin, A. ; Almaraz Avina, E. ; Alme, J. ; Alt, T. ; Altini, V. ; Altinpinar, S. ; Altsybeev, I. ; Andrei, C. ; Andronic, A. ; Anguelov, V. ; Anielski, J. ; Anticic, T. ; Antinori, F. ; Antonioli, P. ; Aphecetche, L. ; Appelshaeuser, H. ; Arbor, N. ; Arcelli, S. ; Arend, A. ; Armesto, N. ; Arnaldi, R. ; Aronsson, T. ; Arsene, I. C. ; Arslandok, M. ; Asryan, A. ; Augustinus, A. ; Averbeck, R. ; Awes, T. C. ; Aysto, J. ; Azmi, M. D. ; Bach, M. ; Badala, A. ; Baek, Y. W. ; Bailhache, R. ; Bala, R. ; Ferroli, R. Baldini ; Baldisseri, A. ; Baldit, A. ; Pedrosa, F. Baltasar Dos Santos ; Ban, J. ; Baral, R. C. ; Barbera, R. ; Barile, F. ; Barnafoeldi, G. G. ; Barnby, L. 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organization

Particle and nuclear physics

publishing date

2012

type

Contribution to journal

publication status

published

subject

Subatomic Physics

in

Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics

volume

708

issue

3-5

pages

249 - 264

publisher

Elsevier

external identifiers

wos:000301556500004
scopus:84863115572

ISSN

0370-2693

DOI

10.1016/j.physletb.2012.01.060

language

English

LU publication?

yes

id

3e9eaaa5-f810-4efe-99fe-d641d6aadb9a (old id 2513325)

date added to LUP

2016-04-01 14:21:34

date last changed

2023-01-04 04:09:53

@article{3e9eaaa5-f810-4efe-99fe-d641d6aadb9a,
  abstract     = {{Angular correlations between unidentified charged trigger (t) and associated (a) particles are measured by the ALICE experiment in Pb-Pb collisions at root s(NN) = 2.76 TeV for transverse momenta 0.25 &lt; p(T)(t,a) &lt; 15 GeV/c, where p(T)(t) &gt; p(T)(a). The shapes of the pair correlation distributions are studied in a variety of collision centrality classes between 0 and 50% of the total hadronic cross section for particles in the pseudorapidity interval |eta| &lt; 1.0. Distributions in relative azimuth Delta phi equivalent to phi(t) - phi(a) are analyzed for |Delta eta| equivalent to |eta(t) - eta(a)| &gt; 0.8, and are referred to as "long-range correlations". Fourier components V-n Delta equivalent to &lt; cos(n Delta phi)&gt; are extracted from the long-range azimuthal correlation functions. If particle pairs are correlated to one another through their individual correlation to a common symmetry plane, then the pair anisotropy V-n Delta (p(T)(t), p(T)(a)) is fully described in terms of single-particle anisotropies v(n)(p(T)) as V-n Delta(p(T)(t), p(T)(a)) = v(n)(p(T)(t))v(n)(p(T)(a)). This expectation is tested for 1 &lt;= n &lt;= 5 by applying a global fit of all V-n Delta(p(T)(t), p(T)(a)) to obtain the best values v(n){GF}(p(T)). It is found that for 2 &lt;= n &lt;= 5, the fit agrees well with data up to p(T)(a) similar to 3-4 GeV/c, with a trend of increasing deviation as p(T)(t) and p(T)(a) are increased or as collisions become more peripheral. This suggests that no pair correlation harmonic can be described over the full 0.25 &lt; p(T) &lt; 15 GeV/c range using a single v(n)(p(T)) curve: such a description is however approximately possible for 2 &lt;= n &lt;= 5 when p(T)(a) &lt; 4 GeV/c. For the n = 1 harmonic, however, a single v(1)(p(T)) curve is not obtained even within the reduced range p(T)(a) &lt; 4 GeV/c. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.}},
  author       = {{Aamodt, K. and Abelev, B. and Abrahantes Quintana, A. and Adamova, D. and Adare, A. M. and Aggarwal, M. M. and Rinella, G. Aglieri and Agocs, A. G. and Agostinelli, A. and Aguilar Salazar, S. and Ahammed, Z. and Ahmad, N. and Masoodi, A. Ahmad and Ahn, S. U. and Akindinov, A. and Aleksandrov, D. and Alessandro, B. and Molina, R. Alfaro and Alici, A. and Alkin, A. and Almaraz Avina, E. and Alme, J. and Alt, T. and Altini, V. and Altinpinar, S. and Altsybeev, I. and Andrei, C. and Andronic, A. and Anguelov, V. and Anielski, J. and Anticic, T. and Antinori, F. and Antonioli, P. and Aphecetche, L. and Appelshaeuser, H. and Arbor, N. and Arcelli, S. and Arend, A. and Armesto, N. and Arnaldi, R. and Aronsson, T. and Arsene, I. C. and Arslandok, M. and Asryan, A. and Augustinus, A. and Averbeck, R. and Awes, T. C. and Aysto, J. and Azmi, M. D. and Bach, M. and Badala, A. and Baek, Y. W. and Bailhache, R. and Bala, R. and Ferroli, R. 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Valencia and Vallero, S. and van der Kolk, N. and van Leeuwen, M. and Vyvre, R. Vande and Vannucci, L. and Vargas, A. and Varma, R. and Vasileiou, M. and Vasiliev, A. and Vechernin, V. and Veldhoen, M. and Venaruzzo, M. and Vercellin, E. and Vergara, S. and Vernekohl, D. C. and Vernet, R. and Verweij, M. and Vickovic, L. and Viesti, G. and Vikhlyantsev, O. and Vilakazi, Z. and Baillie, O. Villalobos and Vinogradov, A. and Vinogradov, L. and Vinogradov, Y. and Virgili, T. and Viyogi, Y. P. and Vodopyanov, A. and Voloshin, K. and Voloshin, S. and Volpe, G. and von Haller, B. and Vranic, D. and Vrlakova, J. and Vulpescu, B. and Vyushin, A. and Wagner, B. and Wagner, V. and Wan, R. and Wang, D. and Wang, M. and Wang, Y. and Wang, Y. and Watanabe, K. and Wessels, J. P. and Westerhoff, U. and Wiechula, J. and Wikne, J. and Wilde, M. and Wilk, A. and Wilk, G. and Williams, M. C. S. and Windelband, B. and Karampatsos, L. Xaplanteris and Yang, H. and Yasnopolskiy, S. and Yi, J. and Yin, Z. and Yokoyama, H. and Yoo, I-K. and Yoon, J. and Yu, W. and Yuan, X. and Yushmanov, I. and Zach, C. and Zampolli, C. and Zaporozhets, S. and Zarochentsev, A. and Zavada, R. and Zaviyalov, N. and Zbroszczyk, H. and Zelnicek, P. and Zgura, I. and Zhalov, M. and Zhang, X. and Zhou, D. and Zhou, F. and Zhou, Y. and Zhu, X. and Zichichi, A. and Zimmermann, A. and Zinovjev, G. and Zoccarato, Y. and Zynovyev, M.}},
  issn         = {{0370-2693}},
  language     = {{eng}},
  number       = {{3-5}},
  pages        = {{249--264}},
  publisher    = {{Elsevier}},
  series       = {{Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics}},
  title        = {{Harmonic decomposition of two particle angular correlations in Pb-Pb collisions at root s(NN)=2.76 TeV}},
  url          = {{http://dx.doi.org/10.1016/j.physletb.2012.01.060}},
  doi          = {{10.1016/j.physletb.2012.01.060}},
  volume       = {{708}},
  year         = {{2012}},
}

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Harmonic decomposition of two particle angular correlations in Pb-Pb collisions at root s(NN)=2.76 TeV