Measurement of deuteron spectra and elliptic flow in Pb–Pb collisions at \(\sqrt{s_{\rm NN}}\) = 2.76 TeV at the LHC
Acharya, Shreyasi; Adamová, Dagmar; Adolfsson, Jonatan; Aggarwal, Madan M.; Aglieri Rinella, Gianluca; Agnello, Michelangelo; Agrawal, Nikita; Ahammed, Zubayer; Ahmad, Shafiq F.; Ahn, Sang Un; Alme, Johan; Altenkaemper, Lucas; Djuvsland, Øystein; Fionda, Fiorella Maria Celeste; Lønne, Per-Ivar; Nystrand, Joakim; Rehman, Attiq ur; Røhrich, Dieter; Tambave, Ganesh Jagannath; Ullaland, Kjetil; Velure, Arild; Wagner, Boris; Zhang, Hui; Zhou, Zhuo; Zhu, Hongsheng; Arsene, Ionut Christian; Bätzing, Paul Christoph; Dordic, Olja; Lardeux, Antoine Xavier; Lindal, Svein; Mahmood, Sohail Musa; Milosevic, Jovan; Richter, Matthias; Røed, Ketil; Skaali, Toralf Bernhard; Tveter, Trine Spedstad; Wikne, Jon Christopher; Zhao, Chengxin; Helstrup, Håvard; Hetland, Kristin Fanebust; Kileng, Bjarte; Nesbø, Simon Voigt; Storetvedt, Maksim Melnik; Langøy, Rune; Lien, Jørgen André; Aiola, Salvatore; Akindinov, Alexander; Alam, Sk Noor; Alba, José Luis Bazo; De Albuquerque, Danilo Silva; ALICE, Collaboration
Peer reviewed, Journal article
Published version

Åpne
Permanent lenke
https://hdl.handle.net/1956/18184Utgivelsesdato
2017-10Metadata
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Originalversjon
https://doi.org/10.1140/epjc/s10052-017-5222-xSammendrag
The transverse momentum \(p_{\rm T}\) spectra and elliptic flow coefficient \(v_2\) of deuterons and anti-deuterons at mid-rapidity \(|y|<0.5\) are measured with the ALICE detector at the LHC in Pb-Pb collisions at \(\sqrt{s_{\rm NN}} = 2.76\) TeV. The measurement of the \(p_{\rm T}\) spectra of (anti-)deuterons is done up to 8 GeV/\).\) in 0-10% centrality class and up to GeV/\).\) in 10-20% and 20-40% centrality classes. The \(v_2\) is measured in the \(0.8 <p_{\rm T} <5\) GeV/\).\) 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 \(\pi^{\pm}\). K\).{\pm}\) and p+\).overline{\mathrm{p}}\) transverse-momentum spectra and \(v_2\) are used to predict the deuteron \(p_{\rm T}\) spectra and \(v_2\) within the Blast-Wave model. The predictions are able to reproduce the \(v_2\) coefficient in the measured \(p_{\rm T}\) range and the transverse-momentum spectra for \(p_{\rm T}>1.8\) GeV/\).\) within the experimental uncertainties. The measurement of the coalescence parameter \(B_2\) is performed, showing a \(p_{\rm T}\) dependence in contrast with the simplest coalescence model, which fails to reproduce also the measured \(v_2\) coefficient. In addition, the coalescence parameter \(B_2\) 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 \(v_2\).\(p_{\rm T}\) and the \(B_2\).\(p_{\rm T}\) trend.