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



Singh, Ranbir, Acharya, S, Acosta, FT, Adamova, D, Adolfsson, J, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z
et al (show 1009 more authors) (2019) Spin alignment measurements using vector mesons with ALICE detector at the LHC .

Access the full-text of this item by clicking on the Open Access link.

Abstract

We present new measurements related to spin alignment of K* 0 vector mesons at mid-rapidity for Pb–Pb collisions at s NN = 2.76 and 5.02 TeV . 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 s NN . 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 = 13 TeV and for K0 S (a spin 0 hadron) in 20-40% central Pb–Pb collisions at s NN = 2.76 TeV are consistent with no spin alignment.

Item Type: Conference Item (Unspecified)
Uncontrolled Keywords: heavy-ion collision, spin alignment, vector meson, ALICE
Depositing User: Symplectic Admin
Date Deposited: 09 May 2019 10:49
Last Modified: 16 Jun 2026 05:48
DOI: 10.1016/j.nuclphysa.2018.12.004
Open Access URL: https://doi.org/10.1016/j.nuclphysa.2018.12.004
Related Websites:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3040431
Disclaimer: The University of Liverpool is not responsible for content contained on other websites from links within repository metadata. Please contact us if you notice anything that appears incorrect or inappropriate.