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

The ALICE collaboration

doi:10.1007/JHEP10(2025)094

First measurement of D^*+ vector meson spin alignment in Pb–Pb collisions at TeV

The ALICE collaboration

Sección de Física

CERN
National Institute for Nuclear Physics
Variable Energy Cyclotron Centre
Sezione INFN
Department of Physics Aligarh Muslim University
Korea Institute of Science and Technology Information
Pavol Jozef Šafárik University
Frankfurt Institute for Advanced Studies
GSI Helmholtzzentrum für Schwerionenforschung
Central China Normal University
Universidad Nacional Autónoma de México
University of Houston
Sungkyunkwan University
University of Bergen
Goethe University Frankfurt
Technical University of Munich
Benemérita Universidad Autónoma de Puebla
National Institute for Physics and Nuclear Engineering
University of Derby
University of Münster
Ruprecht-Karls-Universität Heidelberg
Lawrence Berkeley National Laboratory
Université Grenoble Alpes
Universidade de São Paulo
University of Oslo
Yale University
Tokyo University
Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN
Gangneung-Wonju National University
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Indian Institute of Technology Indore
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CNRS-IN2P3
AGH University of Krakow
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Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
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California Polytechnic State University, San Luis Obispo
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Nara Women's University
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Research output: Contribution to journal › Article › peer-review

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Abstract

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 < p_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 ρ₀₀> 1/3 has been found for p_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).

Original language	English
Article number	94
Journal	Journal of High Energy Physics
Volume	2025
Issue number	10
DOIs	https://doi.org/10.1007/JHEP10(2025)094
State	Published - Oct 2025

Keywords

Heavy Ion Experiments
Particle Correlations and Fluctuations
QCD
Quark Gluon Plasma

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10.1007/JHEP10(2025)094

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@article{8bf57af1d45c45b4afbc7477f261a6b9,

title = "First measurement of D*+ vector meson spin alignment in Pb–Pb collisions at TeV",

abstract = "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).",

keywords = "Heavy Ion Experiments, Particle Correlations and Fluctuations, QCD, Quark Gluon Plasma",

author = "\{The ALICE collaboration\} and S. Acharya and A. Agarwal and \{Aglieri Rinella\}, G. and L. Aglietta and M. Agnello and N. Agrawal and Z. Ahammed and S. Ahmad and Ahn, \{S. U.\} and I. Ahuja and A. Akindinov and V. Akishina and M. Al-Turany and D. Aleksandrov and B. Alessandro and Alfanda, \{H. M.\} and \{Alfaro Molina\}, R. and B. Ali and A. Alici and N. Alizadehvandchali and A. Alkin and J. Alme and G. Alocco and T. Alt and Altamura, \{A. R.\} and I. Altsybeev and Alvarado, \{J. R.\} and Anaam, \{M. N.\} and C. Andrei and N. Andreou and A. Andronic and E. Andronov and V. Anguelov and F. Antinori and P. Antonioli and N. Apadula and H. Appelsh{\"a}user and C. Arata and S. Arcelli and R. Arnaldi and Arneiro, \{J. G.M.C.A.\} and Arsene, \{I. C.\} and M. Arslandok and A. Augustinus and R. Averbeck and D. Averyanov and Azmi, \{M. D.\} and H. Baba and \{Bazo Alba\}, \{J. L.\} and Gago, \{A. M.\}",

note = "Publisher Copyright: {\textcopyright} The Author(s) 2025.",

year = "2025",

month = oct,

doi = "10.1007/JHEP10(2025)094",

language = "English",

volume = "2025",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

number = "10",

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TY - JOUR

T1 - First measurement of D*+ vector meson spin alignment in Pb–Pb collisions at TeV

AU - The ALICE collaboration

AU - Acharya, S.

AU - Agarwal, A.

AU - Aglieri Rinella, G.

AU - Aglietta, L.

AU - Agnello, M.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahmad, S.

AU - Ahn, S. U.

AU - Ahuja, I.

AU - Akindinov, A.

AU - Akishina, V.

AU - Al-Turany, M.

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Alfanda, H. M.

AU - Alfaro Molina, R.

AU - Ali, B.

AU - Alici, A.

AU - Alizadehvandchali, N.

AU - Alkin, A.

AU - Alme, J.

AU - Alocco, G.

AU - Alt, T.

AU - Altamura, A. R.

AU - Altsybeev, I.

AU - Alvarado, J. R.

AU - Anaam, M. N.

AU - Andrei, C.

AU - Andreou, N.

AU - Andronic, A.

AU - Andronov, E.

AU - Anguelov, V.

AU - Antinori, F.

AU - Antonioli, P.

AU - Apadula, N.

AU - Appelshäuser, H.

AU - Arata, C.

AU - Arcelli, S.

AU - Arnaldi, R.

AU - Arneiro, J. G.M.C.A.

AU - Arsene, I. C.

AU - Arslandok, M.

AU - Augustinus, A.

AU - Averbeck, R.

AU - Averyanov, D.

AU - Azmi, M. D.

AU - Baba, H.

AU - Bazo Alba, J. L.

AU - Gago, A. M.

PY - 2025/10

Y1 - 2025/10

N2 - 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).

AB - 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).

KW - Heavy Ion Experiments

KW - Particle Correlations and Fluctuations

KW - QCD

KW - Quark Gluon Plasma

UR - https://www.scopus.com/pages/publications/105018619542

U2 - 10.1007/JHEP10(2025)094

DO - 10.1007/JHEP10(2025)094

M3 - Article

AN - SCOPUS:105018619542

SN - 1126-6708

VL - 2025

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 10

M1 - 94

ER -

First measurement of D^*+ vector meson spin alignment in Pb–Pb collisions at TeV

Abstract

Keywords

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