Hyperon (Λ) polarization along the beam axis in Pb-Pb collisions at √(s_NN)=5.36 TeV

@article{collaboration2026hyperon,
  title = {{Hyperon (Λ) polarization along the beam axis in Pb-Pb collisions at $$\sqrts_\textN\textN=5.36$$ TeV}},
  author = {The ALICE collaboration and D. A. H. Abdallah and I. J. Abualrob and S. Acharya and K. Agarwal and G. Aglieri Rinella and L. Aglietta and N. Agrawal and Z. Ahammed and S. Ahmad and Z. Akbar and V. Akishina and M. Al-Turany and B. Alessandro and A. R. Alfarasyi and R. Alfaro Molina and B. Ali and A. Alici and J. Alme and G. Alocco and T. Alt and I. Altsybeev and C. Andrei and N. Andreou and A. Andronic and M. Angeletti and V. Anguelov and F. Antinori and P. Antonioli and N. Apadula and H. Appelshäuser and S. Arcelli and R. Arnaldi and I. C. Arsene and M. Arslandok and A. Augustinus and R. Averbeck and M. D. Azmi and B. Kong and H. Baba and A. R. J. Babu and A. Badalà and J. Bae and Y. Bae and Y. W. Baek and X. Bai and R. Bailhache and Y. Bailung and R. Bala and A. Baldisseri and B. Balis and S. Bangalia and K. Barai and V. Barbasova and F. Barile and L. Barioglio and M. Barlou and B. Barman and G. G. Barnaföldi and L. S. Barnby},
  journal = {Journal of High Energy Physics},
  year = {2026},
  month = oct,
  doi = {10.1007/jhep10(2026)216},
  url = {https://link.springer.com/article/10.1007/JHEP10(2026)216},
  note = {CC BY 4.0},
}

TY  - JOUR
TI  - Hyperon (Λ) polarization along the beam axis in Pb-Pb collisions at √(s_NN)=5.36 TeV
AU  - The ALICE collaboration
AU  - D. A. H. Abdallah
AU  - I. J. Abualrob
AU  - S. Acharya
AU  - K. Agarwal
AU  - G. Aglieri Rinella
AU  - L. Aglietta
AU  - N. Agrawal
AU  - Z. Ahammed
AU  - S. Ahmad
AU  - Z. Akbar
AU  - V. Akishina
AU  - M. Al-Turany
AU  - B. Alessandro
AU  - A. R. Alfarasyi
AU  - R. Alfaro Molina
AU  - B. Ali
AU  - A. Alici
AU  - J. Alme
AU  - G. Alocco
AU  - T. Alt
AU  - I. Altsybeev
AU  - C. Andrei
AU  - N. Andreou
AU  - A. Andronic
AU  - M. Angeletti
AU  - V. Anguelov
AU  - F. Antinori
AU  - P. Antonioli
AU  - N. Apadula
AU  - H. Appelshäuser
AU  - S. Arcelli
AU  - R. Arnaldi
AU  - I. C. Arsene
AU  - M. Arslandok
AU  - A. Augustinus
AU  - R. Averbeck
AU  - M. D. Azmi
AU  - B. Kong
AU  - H. Baba
AU  - A. R. J. Babu
AU  - A. Badalà
AU  - J. Bae
AU  - Y. Bae
AU  - Y. W. Baek
AU  - X. Bai
AU  - R. Bailhache
AU  - Y. Bailung
AU  - R. Bala
AU  - A. Baldisseri
AU  - B. Balis
AU  - S. Bangalia
AU  - K. Barai
AU  - V. Barbasova
AU  - F. Barile
AU  - L. Barioglio
AU  - M. Barlou
AU  - B. Barman
AU  - G. G. Barnaföldi
AU  - L. S. Barnby
PY  - 2026
DA  - 2026/10/21
JO  - Journal of High Energy Physics
DO  - 10.1007/jhep10(2026)216
UR  - https://link.springer.com/article/10.1007/JHEP10(2026)216
AB  - A bstract : The measurement of hyperon (Λ and Λ ̅ ) polarization along the beam axis in Pb-Pb collisions at √(s_NN)=5.36 TeV using the ALICE detector is presented. The polarization, arising from vorticity components induced by anisotropic flow, is studied relative to the second- and third-order event planes. The measured polarization exhibits clear azimuthal sine modulations, providing the first observation of polarization along the beam direction measured relative to the third-order event plane at the Large Hadron Collider. The values of the polarization measured with respect to the second-order event plane are consistent with previous measurements at √(s_NN)=5.02 TeV and show improved statistical precision owing to the larger data sample. Comparisons with hydrodynamic calculations indicate that the measured polarization is sensitive to the bulk viscosity and the vortical structure of the quark-gluon plasma, offering new constraints on its transport properties. In particular, the polarization measured relative to the third-order event plane is expected to provide an additional and independent input to constrain both bulk and shear viscosities of the quark-gluon plasma.
SN  - 1029-8479
ER  -