The transverse momentum (pT) spectra and elliptic flow coefficient (v2) of deuterons and anti-deuterons at mid-rapidity (| y| < 0.5) are measured with the ALICE detector at the LHC in PbâPb collisions at sNN = 2.76 TeV. The measurement of the pTspectra of (anti-)deuterons is done up to 8 GeV/ c in 0â10% centrality class and up to 6 GeV/ c in 10â20% and 20â40% centrality classes. The v2is measured in the 0.8 <5 GeV/ c interval and in six different centrality intervals (0â5, 5â10, 10â20, 20â30, 30â40 and 40â50%) using the scalar product technique. Measured ϱ, K±and p+p ¯ transverse-momentum spectra and v2are used to predict the deuteron pTspectra and v2within the Blast-Wave model. The predictions are able to reproduce the v2coefficient in the measured pTrange and the transverse-momentum spectra for pT> 1.8 GeV/ c within the experimental uncertainties. The measurement of the coalescence parameter B2is performed, showing a pTdependence in contrast with the simplest coalescence model, which fails to reproduce also the measured v2coefficient. In addition, the coalescence parameter B2and the elliptic flow coefficient in the 20â40% centrality interval are compared with the AMPT model which is able, in its version without string melting, to reproduce the measured v2(pT) and the B2(pT) trend.
Measurement of deuteron spectra and elliptic flow in Pb-Pb collisions at root s(NN)=2.76 TeV at the LHC
Barbera, R.;La Rocca, P.;Petta, C.;Riggi, F.;
2017-01-01
Abstract
The transverse momentum (pT) spectra and elliptic flow coefficient (v2) of deuterons and anti-deuterons at mid-rapidity (| y| < 0.5) are measured with the ALICE detector at the LHC in PbâPb collisions at sNN = 2.76 TeV. The measurement of the pTspectra of (anti-)deuterons is done up to 8 GeV/ c in 0â10% centrality class and up to 6 GeV/ c in 10â20% and 20â40% centrality classes. The v2is measured in the 0.8 <5 GeV/ c interval and in six different centrality intervals (0â5, 5â10, 10â20, 20â30, 30â40 and 40â50%) using the scalar product technique. Measured ϱ, K±and p+p ¯ transverse-momentum spectra and v2are used to predict the deuteron pTspectra and v2within the Blast-Wave model. The predictions are able to reproduce the v2coefficient in the measured pTrange and the transverse-momentum spectra for pT> 1.8 GeV/ c within the experimental uncertainties. The measurement of the coalescence parameter B2is performed, showing a pTdependence in contrast with the simplest coalescence model, which fails to reproduce also the measured v2coefficient. In addition, the coalescence parameter B2and the elliptic flow coefficient in the 20â40% centrality interval are compared with the AMPT model which is able, in its version without string melting, to reproduce the measured v2(pT) and the B2(pT) trend.File | Dimensione | Formato | |
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