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
University of Science and Technology of China
Indian Institute of Technology Indore
University of Jammu
CNRS-IN2P3
AGH University of Krakow
University of Kansas
National and Kapodistrian University of Athens
Gauhati University
Wigner Research Centre for Physics
Nantes Université
Université Clermont Auvergne
University of Lund
Indian Institute of Technology Bombay
University of Copenhagen
Université de Strasbourg
Universidad Autonoma de Sinaloa
Faculty of Nuclear Sciences and Physical Engineering
Czech Academy of Sciences
Bose Institute
Oak Ridge National Laboratory
Pusan National University
Università di Brescia
Institute of Space Science (ISS)
Polytechnic University of Bari
Sofia University St. Kliment Ohridski
STFC Daresbury Laboratory
Austrian Academy of Sciences
National Research Foundation
University of the Witwatersrand
Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
Pontifical Catholic Univ. of Peru
National University of Science and Technology POLITEHNICA Bucharest
Warsaw University of Technology
University of Liverpool
Fudan University
Université de Lyon
Max-Planck-Institut für Physik
Inha University
Homi Bhabha National Institute
National Institute for Subatomic Physics
University of Tsukuba
Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile
University of Birmingham
Università del Piemonte Orientale and Gruppo Collegato INFN
Universidade Federal do ABC
University of Pavia
University of California at Berkeley
Università degli Studi di Foggia
Comenius University
Hiroshima University
INFN, Laboratori Nazionali Di Frascati
Politecnico di Torino
University of Texas at Austin
Saga University
Chicago State University
Universidade Federal do Rio Grande do Sul
University of Tennessee
Wayne State University
University of Split
Institute for Subatomic Physics of Utrecht University
A. Alikhanian Yerevan Institute of Physics
China Institute of Atomic Energy
Nagasaki Institute of Applied Science
Yonsei University
University of Jyväskylä
Rheinische Friedrich-Wilhelms-Universität Bonn
Faculty of Technology
Centro de Investigación y de Estudios AVanzados (CINVESTAV)
Ohio State University
Technical University of Košice
National Research and Innovation Agency Republic of Indonesia
Universidade Estadual de Campinas
Suranaree University of Technology
Slovak Academy of Sciences
Yildiz Technical University
Jeonbuk National University
Sejong University
California Polytechnic State University, San Luis Obispo
University of Zagreb
Panjab University
National Centre for Nuclear Studies
Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN
University of South-Eastern Norway
Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear
University of Messina
University of Helsinki
Chungbuk National University
China University of Geosciences
Creighton University
University of Wrocław
National Nuclear Research Center
Eberhard Karls Universität Tübingen
Nara Women's University
Bogolyubov Institute for Theoretical Physics Nasu
Institute of Physics of the Czech Academy of Sciences

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Resumen

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).

Idioma original	Inglés
Número de artículo	94
Publicación	Journal of High Energy Physics
Volumen	2025
N.º	10
DOI	https://doi.org/10.1007/JHEP10(2025)094
Estado	Publicada - oct. 2025

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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",

}

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