Forward-central two-particle correlations in p-Pb collisions at root s(NN)=5.02 TeV

J. Adam; D. Adamova; M.M. Aggarwal; G. Aglieri Rinella; Maria Agnello; N. Agrawal; Z. Ahammed; S. U. Ahn; I. Aimo; S. Aiola; A. Akindinov; B. Alessandro; A. Alici; A. Alkin; T. Alt; Ian Bearden; Hans Bøggild; Christian Holm Christensen; Kristjan Herlache Gulbrandsen; Jens Jørgen Gaardhøje; Hans Hjersing Dalsgaard; Børge Svane Nielsen; Alexander Colliander Hansen; Ante Bilandzic; Marek Chojnacki; Valentina Zaccolo; You Zhou; Christian Alexander Bourjau

doi:10.1016/j.physletb.2015.12.010

Forward-central two-particle correlations in p-Pb collisions at root s(NN)=5.02 TeV

J. Adam, D. Adamova, M.M. Aggarwal, G. Aglieri Rinella, Maria Agnello, N. Agrawal, Z. Ahammed, S. U. Ahn, I. Aimo, S. Aiola, A. Akindinov, B. Alessandro, A. Alici, A. Alkin, T. Alt, Ian Bearden, Hans Bøggild, Christian Holm Christensen, Kristjan Herlache Gulbrandsen, Jens Jørgen GaardhøjeHans Hjersing Dalsgaard, Børge Svane Nielsen, Alexander Colliander Hansen, Ante Bilandzic, Marek Chojnacki, Valentina Zaccolo, You Zhou, Christian Alexander Bourjau

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Abstract

Two-particle angular correlations between trigger particles in the forward pseudorapidity range (2.5 < |η| < 4.0) and associated particles in the central range (|η| < 1.0) are measured with the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV. The trigger particles are reconstructed using the muon spectrometer, and the associated particles by the central barrel tracking detectors. In high-multiplicity events, the double-ridge structure, previously discovered in two-particle angular correlations at midrapidity, is found to persist to the pseudorapidity ranges studied in this Letter. The second-order Fourier coefficients for muons in high-multiplicity events are extracted after jet-like correlations from low-multiplicity events have been subtracted. The coefficients are found to have a similar transverse momentum (p_T) dependence in p-going (p-Pb) and Pb-going (Pb-p) configurations, with the Pb-going coefficients larger by about 16 ± 6%, rather independent of p_T within the uncertainties of the measurement. The data are compared with calculations using the AMPT model, which predicts a different p_T and η dependence than observed in the data. The results are sensitive to the parent particle v2 and composition of reconstructed muon tracks, where the contribution from heavy flavour decays is expected to dominate at p_T>2 GeV/c.

Originalsprog	Engelsk
Tidsskrift	Physics Letters B
Vol/bind	753
Sider (fra-til)	126-139
ISSN	0370-2693
DOI	https://doi.org/10.1016/j.physletb.2015.12.010
Status	Udgivet - 10 feb. 2016

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10.1016/j.physletb.2015.12.010

1-s2.0-S0370269315009533-mainForlagets udgivne version, 920 KBLicens: CC BY

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Adam, J., Adamova, D., Aggarwal, M. M., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., U. Ahn, S., Aimo, I., Aiola, S., Akindinov, A., Alessandro, B., Alici, A., Alkin, A., Alt, T., Bearden, I., Bøggild, H., Christensen, C. H., Gulbrandsen, K. H., ... Bourjau, C. A. (2016). Forward-central two-particle correlations in p-Pb collisions at root s(NN)=5.02 TeV. Physics Letters B, 753, 126-139. https://doi.org/10.1016/j.physletb.2015.12.010

Adam, J, Adamova, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, U. Ahn, S, Aimo, I, Aiola, S, Akindinov, A, Alessandro, B, Alici, A, Alkin, A, Alt, T, Bearden, I , Bøggild, H , Christensen, CH , Gulbrandsen, KH , Gaardhøje, JJ, Dalsgaard, HH, Nielsen, BS, Hansen, AC, Bilandzic, A, Chojnacki, M, Zaccolo, V, Zhou, Y & Bourjau, CA 2016, 'Forward-central two-particle correlations in p-Pb collisions at root s(NN)=5.02 TeV', Physics Letters B, bind 753, s. 126-139. https://doi.org/10.1016/j.physletb.2015.12.010

@article{5a3762d5d0474324823fd4e2ffcd2fb4,

title = "Forward-central two-particle correlations in p-Pb collisions at root s(NN)=5.02 TeV",

abstract = "Two-particle angular correlations between trigger particles in the forward pseudorapidity range (2.5 < |η| < 4.0) and associated particles in the central range (|η| < 1.0) are measured with the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV. The trigger particles are reconstructed using the muon spectrometer, and the associated particles by the central barrel tracking detectors. In high-multiplicity events, the double-ridge structure, previously discovered in two-particle angular correlations at midrapidity, is found to persist to the pseudorapidity ranges studied in this Letter. The second-order Fourier coefficients for muons in high-multiplicity events are extracted after jet-like correlations from low-multiplicity events have been subtracted. The coefficients are found to have a similar transverse momentum (pT) dependence in p-going (p-Pb) and Pb-going (Pb-p) configurations, with the Pb-going coefficients larger by about 16 ± 6%, rather independent of pT within the uncertainties of the measurement. The data are compared with calculations using the AMPT model, which predicts a different pT and η dependence than observed in the data. The results are sensitive to the parent particle v2 and composition of reconstructed muon tracks, where the contribution from heavy flavour decays is expected to dominate at pT>2 GeV/c.",

author = "J. Adam and D. Adamova and M.M. Aggarwal and {Aglieri Rinella}, G. and Maria Agnello and N. Agrawal and Z. Ahammed and {U. Ahn}, S. and I. Aimo and S. Aiola and A. Akindinov and B. Alessandro and A. Alici and A. Alkin and T. Alt and Ian Bearden and Hans B{\o}ggild and Christensen, {Christian Holm} and Gulbrandsen, {Kristjan Herlache} and Gaardh{\o}je, {Jens J{\o}rgen} and Dalsgaard, {Hans Hjersing} and Nielsen, {B{\o}rge Svane} and Hansen, {Alexander Colliander} and Ante Bilandzic and Marek Chojnacki and Valentina Zaccolo and You Zhou and Bourjau, {Christian Alexander}",

year = "2016",

month = feb,

day = "10",

doi = "10.1016/j.physletb.2015.12.010",

language = "English",

volume = "753",

pages = "126--139",

journal = "Physics Letters B",

issn = "0370-2693",

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TY - JOUR

T1 - Forward-central two-particle correlations in p-Pb collisions at root s(NN)=5.02 TeV

AU - Adam, J.

AU - Adamova, D.

AU - Aggarwal, M.M.

AU - Aglieri Rinella, G.

AU - Agnello, Maria

AU - Agrawal, N.

AU - Ahammed, Z.

AU - U. Ahn, S.

AU - Aimo, I.

AU - Aiola, S.

AU - Akindinov, A.

AU - Alessandro, B.

AU - Alici, A.

AU - Alkin, A.

AU - Alt, T.

AU - Bearden, Ian

AU - Bøggild, Hans

AU - Christensen, Christian Holm

AU - Gulbrandsen, Kristjan Herlache

AU - Gaardhøje, Jens Jørgen

AU - Dalsgaard, Hans Hjersing

AU - Nielsen, Børge Svane

AU - Hansen, Alexander Colliander

AU - Bilandzic, Ante

AU - Chojnacki, Marek

AU - Zaccolo, Valentina

AU - Zhou, You

AU - Bourjau, Christian Alexander

PY - 2016/2/10

Y1 - 2016/2/10

N2 - Two-particle angular correlations between trigger particles in the forward pseudorapidity range (2.5 < |η| < 4.0) and associated particles in the central range (|η| < 1.0) are measured with the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV. The trigger particles are reconstructed using the muon spectrometer, and the associated particles by the central barrel tracking detectors. In high-multiplicity events, the double-ridge structure, previously discovered in two-particle angular correlations at midrapidity, is found to persist to the pseudorapidity ranges studied in this Letter. The second-order Fourier coefficients for muons in high-multiplicity events are extracted after jet-like correlations from low-multiplicity events have been subtracted. The coefficients are found to have a similar transverse momentum (pT) dependence in p-going (p-Pb) and Pb-going (Pb-p) configurations, with the Pb-going coefficients larger by about 16 ± 6%, rather independent of pT within the uncertainties of the measurement. The data are compared with calculations using the AMPT model, which predicts a different pT and η dependence than observed in the data. The results are sensitive to the parent particle v2 and composition of reconstructed muon tracks, where the contribution from heavy flavour decays is expected to dominate at pT>2 GeV/c.

AB - Two-particle angular correlations between trigger particles in the forward pseudorapidity range (2.5 < |η| < 4.0) and associated particles in the central range (|η| < 1.0) are measured with the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV. The trigger particles are reconstructed using the muon spectrometer, and the associated particles by the central barrel tracking detectors. In high-multiplicity events, the double-ridge structure, previously discovered in two-particle angular correlations at midrapidity, is found to persist to the pseudorapidity ranges studied in this Letter. The second-order Fourier coefficients for muons in high-multiplicity events are extracted after jet-like correlations from low-multiplicity events have been subtracted. The coefficients are found to have a similar transverse momentum (pT) dependence in p-going (p-Pb) and Pb-going (Pb-p) configurations, with the Pb-going coefficients larger by about 16 ± 6%, rather independent of pT within the uncertainties of the measurement. The data are compared with calculations using the AMPT model, which predicts a different pT and η dependence than observed in the data. The results are sensitive to the parent particle v2 and composition of reconstructed muon tracks, where the contribution from heavy flavour decays is expected to dominate at pT>2 GeV/c.

U2 - 10.1016/j.physletb.2015.12.010

DO - 10.1016/j.physletb.2015.12.010

M3 - Journal article

SN - 0370-2693

VL - 753

SP - 126

EP - 139

JO - Physics Letters B

JF - Physics Letters B

ER -

Forward-central two-particle correlations in p-Pb collisions at root s(NN)=5.02 TeV

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