Study of nuclear modification factors of deuteron and anti-deuteron in Pb-Pb collisions at √sNN=2.76 TeV

The nuclear modification factors (R-AA) of d and d have been studied using the parton and hadron cascade model plus the dynamically constrained phase space coalescence model in peripheral (40-60%) and central (0 7 5%) Pb-Pb collisions at root s(NN) = 2.76 TeV with vertical bar y vertical bar< 0.5, p(T) < 20.0 GeV/c. It is found that the R-AA of d, (d) over bar is similar to that of hadrons (pi(+/-) , p, (p) over bar) and the R-AA of antiparticles is the same as that of particles. The suppression effect of d is more significant than that of baryons and mesons in the high-p(T) region. The suppression of R-AA at high-p(T) strongly depends on event centrality and mass of the particles, i.e., the central collision is more suppressed than the peripheral collision. Besides, the yield ratios and double ratios for different particle species, and the coalescence parameter B-2 for (d, (d) over bar) in pp and Pb-Pb collisions are discussed, respectively. It is observed that the yield ratios and double ratios of d top and p to pi are similar to those of their anti-particles in three different collision systems, suggesting that the suppressions of matter (pi(+), p, d) and the corresponding antimatter (pi(-), (p) over bar, (d) over bar) are around the same level.

Automated summary

The nuclear modification factors of d and d in Pb-Pb collisions have been studied using a cascade model. It is found that the d and d-bar show similar suppression as hadrons in high-pT region, and the suppression depends on centrality and mass. The yield ratios and double ratios for different particle species are discussed.