Polarization of Λ and Λ ¯ Hyperons along the Beam Direction in Pb-Pb Collisions at s N N = 5.02     TeV

Acharya, S.; Adamová, D.; Adler, A.; Aglieri Rinella, G.; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahmad, S.; Ahn, S. U.; Ahuja, I.; Akbar, Z.; Akindinov, A.; Al-Turany, M.; Alam, S. N.; Aleksandrov, D.; Alessandro, B.; Alfanda, H. M.; Alfaro Molina, R.; Ali, B.; Ali, Y.; Alici, A.; Alizadehvandchali, N.; Alkin, A.; Alme, J.; Alt, T.; Altenkamper, L.; Altsybeev, I.; Anaam, M. N.; Andrei, C.; Andreou, D.; Andronic, A.; Angeletti, M.; Anguelov, V.; Antinori, F.; Antonioli, P.; Anuj, C.; Apadula, N.; Aphecetche, L.; Appelshäuser, H.; Arcelli, S.; Arnaldi, R.; Arsene, I. C.; Arslandok, M.; Augustinus, A.; Averbeck, R.; Aziz, S.; Azmi, M. D.; Badalà, A.; Baek, Y. W.; Bai, X.; Bailhache, R.; Bailung, Y.; Bala, R.; Balbino, A.; Baldisseri, A.; Balis, B.; Ball, M.; Banerjee, D.; Barbera, R.; Barioglio, L.; Barlou, M.; Barnaföldi, G. G.; Barnby, L. S.; Barret, V.; Bartels, C.; Barth, K.; Bartsch, E.; Baruffaldi, F.; Bastid, N.; Basu, S.; Batigne, G.; Batyunya, B.; Bauri, D.; Bazo Alba, J. 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C.; Danu, A.; Das, I.; Das, P.; Das, P.; Das, S.; Dash, S.; De, S.; De Caro, A.; de Cataldo, G.; De Cilladi, L.; de Cuveland, J.; De Falco, A.; De Gruttola, D.; De Marco, N.; De Martin, C.; De Pasquale, S.; Deb, S.; Degenhardt, H. F.; Deja, K. R.; Dello Stritto, L.; Delsanto, S.; Deng, W.; Dhankher, P.; Di Bari, D.; Di Mauro, A.; Diaz, R. A.; Dietel, T.; Ding, Y.; Divià, R.; Dixit, D. U.; Djuvsland, Ø.; Dmitrieva, U.; Do, J.; Dobrin, A.; Dönigus, B.; Dordic, O.; Dubey, A. K.; Dubla, A.; Dudi, S.; Dukhishyam, M.; Dupieux, P.; Dzalaiova, N.; Eder, T. M.; Ehlers, R. J.; Eikeland, V. N.; Eisenhut, F.; Elia, D.; Erazmus, B.; Ercolessi, F.; Erhardt, F.; Erokhin, A.; Ersdal, M. R.; Espagnon, B.; Eulisse, G.; Evans, D.; Evdokimov, S.; Fabbietti, L.; Faggin, M.; Faivre, J.; Fan, F.; Fantoni, A.; Fasel, M.; Fecchio, P.; Feliciello, A.; Feofilov, G.; Fernández Téllez, A.; Ferrero, A.; Ferretti, A.; Feuillard, V. J. G.; Figiel, J.; Filchagin, S.; Finogeev, D.; Fionda, F. 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doi:10.1103/PhysRevLett.128.172005

Title: Polarization of $Λ$ and $\bar{Λ}$ Hyperons along the Beam Direction in Pb-Pb Collisions at ${\sqrt{s}}_{N N} = 5.02 TeV$

Journal Article · Fri Apr 29 00:00:00 EDT 2022 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.128.172005· OSTI ID:1866003

Acharya, S.; Adamová, D.; Adler, A.; Aglieri Rinella, G.; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahmad, S.; Ahn, S. U.; Ahuja, I.; Akbar, Z.; Akindinov, A.; Al-Turany, M.; Alam, S. N.; Aleksandrov, D.; Alessandro, B.; Alfanda, H. M.; Alfaro Molina, R.; Ali, B.; Ali, Y. more »

The polarization of the Λ and $$\bar{Λ}$$ hyperons along the beam (z) direction, P_z, has been measured in Pb-Pb collisions at $$\sqrt{s_{NN}}$$ = 5.02 TeV recorded with ALICE at the Large Hadron Collider (LHC). The main contribution to P_z comes from elliptic flow-induced vorticity and can be characterized by the second Fourier sine coefficient P_z,s2 = $$\langle$$P_zsin(2φ-2Ψ₂)$$\rangle$$, where φ is the hyperon azimuthal emission angle and Ψ₂ is the elliptic flow plane angle. We report the measurement of P_z,s2 for different collision centralities and in the 30%-50% centrality interval as a function of the hyperon transverse momentum and rapidity. The P_z,s2 is positive similarly as measured by the STAR Collaboration in Au-Au collisions at $$\sqrt{s_{NN}}$$ = 200 GeV, with somewhat smaller amplitude in the semicentral collisions. This is the first experimental evidence of a nonzero hyperon P_z in Pb-Pb collisions at the LHC. The comparison of the measured P_z,s2 with the hydrodynamic model calculations shows sensitivity to the competing contributions from thermal and the recently found shear-induced vorticity, as well as to whether the polarization is acquired at the quark-gluon plasma or the hadronic phase.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: ALICE Collaboration

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725; FG02-96ER40982

OSTI ID:: 1866003

Alternate ID(s):: OSTI ID: 1881883; OSTI ID: 1886469; OSTI ID: 2007919

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Vol. 128 Journal Issue: 17; ISSN 0031-9007

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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