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

The transverse momentum ( p 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 s NN = 2.76 TeV. The measurement of the p T 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 2 is measured in the 0.8 < p T < 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 , K and p+p transverse-momentum spectra and v 2 are used to predict the deuteron p T spectra and v 2 within the Blast-Wave model. The predictions are able to reproduce the v 2 coefficient in the measured p T range and the transversemomentum spectra for p T > 1.8 GeV/c within the experimental uncertainties. The measurement of the coalescence parameter B 2 is performed, showing a p 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 T ) and the B 2 ( p T ) trend.