Measurement of deuteron spectra and elliptic flow in PbâPb collisions at sqrt(s_NN) = 2.76 TeV at the LHC

The transverse momentum () spectra and elliptic flow coefficient () of deuterons and anti-deuterons at mid-rapidity () are measured with the ALICE detector at the LHC in Pb–Pb collisions at = 2.76 TeV. The measurement of the spectra of (anti-)deuterons is done up to 8 GeV in 0–10% centrality class and up to 6 GeV in 10–20% and 20–40% centrality classes. The is measured in the 0.8   1.8 GeV within the experimental uncertainties. The measurement of the coalescence parameter is performed, showing a dependence in contrast with the simplest coalescence model, which fails to reproduce also the measured coefficient. In addition, the coalescence parameter 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 () and the () trend.