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...
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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
30 June 2020
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| 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 
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| Author Notes: | S. Acharya et al.* (The ALICE Collaboration) |
MARC
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| 500 | |a 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] | ||
| 500 | |a Gesehen am 15.09.2020 | ||
| 520 | |a 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. | ||
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