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Peter Christiansen Profile

Peter Christiansen

Professor

Peter Christiansen Profile

First measurement of D*+ vector meson spin alignment in Pb–Pb collisions at √sNN = 5.02 TeV

Author

  • S. Acharya
  • S. Basu
  • P. Christiansen
  • J. Hansen
  • K.E. Iversen
  • R. Nepeivoda
  • A. Ohlson
  • I. Panasenko
  • D. Silvermyr
  • J. Staa
  • N. Zurlo
Show all

Summary, in English

The first measurement of prompt D*+-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 ρ00 of the diagonal spin-density matrix for prompt D*+ mesons with 4 < pT< 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 ρ00> 1/3 has been found for pT> 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). © The Author(s) 2025.

Department/s

  • Particle and nuclear physics

Publishing year

2025

Language

English

Publication/Series

Journal of High Energy Physics

Volume

2025

Issue

10

Document type

Article

Publisher

Springer

Topic

  • Subatomic Physics

Keywords

  • Heavy Ion Experiments
  • Particle Correlations and Fluctuations
  • QCD
  • Quark Gluon Plasma

Status

Published

ISBN/ISSN/Other

  • ISSN: 1029-8479