Spin alignment measurements using vector mesons with ALICE detector at the LHC

We present new measurements related to spin alignment of K * 0 vector mesons at mid-rapidity for Pb–Pb collisions at sNN=2.76and5.02TeV . The spin alignment measurements are carried out with respect to production plane and 2 nd order event plane. At low p T the spin density matrix element ρ 00 for K * 0 is found to have values slightly below 1/3, while it is consistent with 1/3, i.e. no spin alignment, at high p T . Similar values of ρ 00 are observed with respect to both production plane and event plane. Within statistical and systematic uncertainties, ρ 00 values are also found to be independent of sNN . ρ 00 also shows centrality dependence with maximum deviation from 1/3 for mid-central collisions with respect to both the kinematic planes. The measurements for K * 0 in pp collisions at s=13TeV and for K 0 S (a spin 0 hadron) in 20-40% central Pb–Pb collisions at sNN=2.76TeV are consistent with no spin alignment.