Электронный каталог

Статья

Acharya, S.
First Measurement of D&sup( *+) Vector Meson Spin Alignment in Pb-Pb Collisions at *%s&sub(NN)=5.02 TeV / S.Acharya, B.Batyunya, R.A.Diaz, S.Grigoryan, A.Kondratyev, A.Kuznetsov, L.Malinina, K.Mikhaylov, P.Nomokonov, V.Pozdniakov, E.Rogochaya, A.Vodopyanov, [ALICE Collab.]. – Text : electronic // Journal of High Energy Physics. – 2025. – Vol. 2025, No. 10. – P. 094. – URL: https://doi.org/10.1007/JHEP10(2025)094. – Bibliogr.: 53.

The first measurement of prompt D&sup(*+)-meson spin alignment in ultrarelativistic heavy-ion collisions with respect to the direction orthogonal to the reaction plane is presented. The spin alignment is quantified by measuring the element ρ&sub(00) of the diagonal spin-density matrix for prompt D&sup(*+) mesons with 4 < p&sub(T) < 30 GeV/c in two rapidity intervals, |y| < 0.3 and 0.3 < |y| < 0.8, in central (0–10%) and midcentral (30–50%) Pb–Pb collisions at TeV. Evidence of spin alignment ρ&sub(00) > 1/3 has been found for p&sub(T) > 15 GeV/c and 0.3 < |y| < 0.8 with a significance of 3.1σ. The measured spin alignment of prompt D*+ mesons is compared with the one of inclusive J/ψ mesons measured at forward rapidity (2.5 < y < 4).



ОИЯИ = ОИЯИ (JINR)2025