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

S. Acharya, D. Adamová, J. Adolfsson, M.M. Aggarwal, G. Aglieri Rinella, M. Agnello, N. Agrawal, Z. Ahammed, N. Ahmad, S.U. Ahn, …
European Physical Journal C, 卷.77(10), 658
10/2017
DOI: https://doi.org/10.1140/epjc/s10052-017-5222-x

摘要

Engineering (miscellaneous) Physics and Astronomy (miscellaneous)
The transverse momentum (p <sub>T</sub> ) spectra and elliptic flow coefficient (v <sub>2</sub> ) 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 sNN = 2.76 TeV. The measurement of the p <sub>T</sub> spectra of (anti-)deuterons is done up to 8 GeV/ c in 0–10% centrality class and up to 6 GeV/ c in 10–20% and 20–40% centrality classes. The v <sub>2</sub> is measured in the 0.8 < p <sub>T</sub> <5 GeV/ 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 π <sup>±</sup> , K <sup>±</sup> and p+p ¯ transverse-momentum spectra and v <sub>2</sub> are used to predict the deuteron p <sub>T</sub> spectra and v <sub>2</sub> within the Blast-Wave model. The predictions are able to reproduce the v <sub>2</sub> coefficient in the measured p <sub>T</sub> range and the transverse-momentum spectra for p <sub>T</sub> > 1.8 GeV/ c within the experimental uncertainties. The measurement of the coalescence parameter B <sub>2</sub> is performed, showing a p <sub>T</sub> dependence in contrast with the simplest coalescence model, which fails to reproduce also the measured v <sub>2</sub> coefficient. In addition, the coalescence parameter B <sub>2</sub> 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 <sub>2</sub> (p <sub>T</sub> ) and the B <sub>2</sub> (p <sub>T</sub> ) trend.

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