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Measurement of deuteron spectra and elliptic flow in Pb–Pb collisions at √sNN=2.76 TeV at the LHC

The transverse momentum (pTpTp_\mathrm{T} ) spectra and elliptic flow coefficient (v2v2v_{2}) of deuterons and anti-deuterons at mid-rapidity (|y|<0.5|y|<0.5|y|<0.5) are measured with the ALICE detector at the LHC in Pb-Pb collisions at sNN−−−√sNN\sqrt{s_{\mathrm {NN}}} = 2.76 TeV. The meas...

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Main Authors: Acharya, Shreyasi (Author) , Angelov, Venelin (Author) , Arslandok, Mesut (Author) , Danisch, Meike (Author) , Deisting, Alexander (Author) , Glässel, Peter (Author) , Kim, Jiyoung (Author) , Klewin, Sebastian (Author) , Leardini, Lucia (Author) , Mercado Pérez, Jorge (Author) , Oeschler, Helmut (Author) , Ohlson, Alice (Author) , Pachmayer, Yvonne C. (Author) , Reygers, Klaus (Author) , Schicker, Rainer (Author) , Schmidt, Marten Ole (Author) , Schuchmann, Simone (Author) , Stachel, Johanna (Author) , Weiser, Dennis (Author) , Wilkinson, Jeremy (Author) , Windelband, Bernd (Author) , Zimmermann, Alice (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal)
Language:English
Published: 4 October 2017
In: The European physical journal. C, Particles and fields
Year: 2017, Volume: 77, Issue: 10
ISSN:1434-6052
DOI:10.1140/epjc/s10052-017-5222-x
Online Access:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1140/epjc/s10052-017-5222-x
Verlag, kostenfrei, Volltext: https://doi.org/10.1140/epjc/s10052-017-5222-x
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Author Notes:ALICE Collaboration*
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Summary:The transverse momentum (pTpTp_\mathrm{T} ) spectra and elliptic flow coefficient (v2v2v_{2}) of deuterons and anti-deuterons at mid-rapidity (|y|<0.5|y|<0.5|y|<0.5) are measured with the ALICE detector at the LHC in Pb-Pb collisions at sNN−−−√sNN\sqrt{s_{\mathrm {NN}}} = 2.76 TeV. The measurement of the pTpTp_\mathrm{T} spectra of (anti-)deuterons is done up to 8 GeV/c/c/c in 0-10% centrality class and up to 6 GeV/c/c/c in 10-20% and 20-40% centrality classes. The v2v2v_{2} is measured in the 0.8 < pTpTp_\mathrm{T} < < <~5 GeV/c/c/c interval and in six different centrality intervals (0-5, 5-10, 10-20, 20-30, 30-40 and 40-50%) using the scalar product technique. Measured ππ\pi ±±^{\pm }, K±±^{\pm } and p+p¯¯¯p¯\overline{\mathrm {p}} transverse-momentum spectra and v2v2v_{2} are used to predict the deuteron pTpTp_\mathrm{T} spectra and v2v2v_{2} within the Blast-Wave model. The predictions are able to reproduce the v2v2v_{2} coefficient in the measured pTpTp_\mathrm{T} range and the transverse-momentum spectra for pTpTp_\mathrm{T} > 1.8 GeV/c/c/c within the experimental uncertainties. The measurement of the coalescence parameter B2B2B_2 is performed, showing a pTpTp_\mathrm{T} dependence in contrast with the simplest coalescence model, which fails to reproduce also the measured v2v2v_{2} coefficient. In addition, the coalescence parameter B2B2B_2 and the elliptic flow coefficient in the 20-40% centrality interval are compared with the AMPT model which is able, in its version without string melting, to reproduce the measured v2v2v_{2}(pTpTp_\mathrm{T} ) and the B2B2B_2(pTpTp_\mathrm{T} ) trend.
Item Description:ALICE Collaboration: S. Acharya, V. Anguelov, M. Arslandok, M.C. Danisch, A. Deisting, P. Glässel, J. Kim, S. Klewin, L. Leardini, J. Mercado Pérez, H. Oeschler, A. Ohlson, Y. Pachmayer, K. Reygers, R. Schicker, M.O. Schmidt, S. Schuchmann, J. Stachel, D.F. Weiser, J. Wilkinson, B. Windelband, A. Zimmermann [und weitere]
Gesehen am 27.08.2018
Physical Description:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-017-5222-x

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