Cover Image

Evidence of spin-orbital angular momentum interactions in relativistic heavy-ion collisions

The first evidence of spin alignment of vector mesons (K*0 and ϕ) in heavy-ion collisions at the Large Hadron Collider (LHC) is reported. The spin density matrix element ρ00 is measured at midrapidity (|y|<0.5) in Pb-Pb collisions at a center-of-mass energy (√sNN) of 2.76 TeV with the ALICE detec...

Full description

Saved in:
Bibliographic Details
Main Authors: Acharya, Shreyasi (Author) , Angelov, Venelin (Author) , Arslandok, Mesut (Author) , Danisch, Meike (Author) , Feuillard, Victor (Author) , Glässel, Peter (Author) , Kim, Jiyoung (Author) , Kim, Minjung (Author) , Köhler, Markus Konrad (Author) , Martin, Nicole Alice (Author) , Ohlson, Alice (Author) , Reygers, Klaus (Author) , Schicker, Rainer (Author) , Schmah, Alexander (Author) , Schmidt, Marten Ole (Author) , Stachel, Johanna (Author) , Weiser, Dennis (Author) , Windelband, Bernd (Author) , Yüncü, Alperen (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal)
Language:English
Published: 30 June 2020
In: Physical review letters
Year: 2020, Volume: 125, Issue: 1
ISSN:1079-7114
DOI:10.1103/PhysRevLett.125.012301
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.125.012301
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.125.012301
Get full text
Author Notes:S. Acharya et al.* (The ALICE Collaboration)
Description
Summary:The first evidence of spin alignment of vector mesons (K*0 and ϕ) in heavy-ion collisions at the Large Hadron Collider (LHC) is reported. The spin density matrix element ρ00 is measured at midrapidity (|y|<0.5) in Pb-Pb collisions at a center-of-mass energy (√sNN) of 2.76 TeV with the ALICE detector. ρ00 values are found to be less than 1/3 (1/3 implies no spin alignment) at low transverse momentum (pT<2 GeV/c) for K*0 and ϕ at a level of 3σ and 2σ, respectively. No significant spin alignment is observed for the K0S meson (spin=0) in Pb-Pb collisions and for the vector mesons in pp collisions. The measured spin alignment is unexpectedly large but qualitatively consistent with the expectation from models which attribute it to a polarization of quarks in the presence of angular momentum in heavy-ion collisions and a subsequent hadronization by the process of recombination.
Item Description:The ALICE Collaboration: S. Acharya, V. Angelov, M. Arslandok, M. Danisch, V. Feuillard, P. Glässel, J. Kim, M. Kim, M.K. Köhler, N.A. Martin, A. Ohlson, K. Reygers, R. Schicker, A. Schmah, M.O. Schmidt, J. Stachel, D. Weiser, B. Windelband, A. Yüncü [und viele weitere]
Gesehen am 15.09.2020
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.125.012301

Similar Items