Polarization of Λ and Λ[over ¯] Hyperons along the Beam Direction in Pb-Pb Collisions at sqrt[s]_{NN}=5.02 TeV
Articolo
Data di Pubblicazione:
2022
Abstract:
: The polarization of the Λ and Λ[over ¯] 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}=⟨P_{z}sin(2φ-2Ψ_{2})⟩, where φ is the hyperon azimuthal emission angle and Ψ_{2} 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.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
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 L; Bearden, I G; Beattie, C; Belikov, I; Bell Hechavarria, A D C; Bellini, F; Bellwied, R; Belokurova, S; Belyaev, V; Bencedi, G; Beole, S; Bercuci, A; Berdnikov, Y; Berdnikova, A; Bergmann, L; Besoiu, M G; Betev, L; Bhaduri, P P; Bhasin, A; Bhat, I R; Bhat, M A; Bhattacharjee, B; Bhattacharya, P; Bianchi, L; Bianchi, N; Bielčík, J; Bielčíková, J; Biernat, J; Bilandzic, A; Biro, G; Biswas, S; Blair, J T; Blau, D; Blidaru, M B; Blume, C; Boca, G; Bock, F; Bogdanov, A; Boi, S; Bok, J; Boldizsár, L; Bolozdynya, A; Bombara, M; Bond, P M; Bonomi, G; Borel, H; Borissov, A; Bossi, H; Botta, E; Bratrud, L; Braun-Munzinger, P; Bregant, M; Broz, M; Bruno, G E; Buckland, M D; Budnikov, D; Buesching, H; Bufalino, S; Bugnon, O; Buhler, P; Buthelezi, Z; Butt, J B; Bysiak, S A; Cai, M; Caines, H; Caliva, A; Calvo Villar, E; Camacho, J M M; Camacho, R S; Camerini, P; Canedo, F D M; Carnesecchi, F; Caron, R; Castillo Castellanos, J; Casula, E A R; Catalano, F; Ceballos Sanchez, C; Chakraborty, P; Chandra, S; Chapeland, S; Chartier, M; Chattopadhyay, S; Chattopadhyay, S; Chauvin, A; Chavez, T G; Cheng, T; Cheshkov, C; Cheynis, B; Chibante Barroso, V; Chinellato, D D; Cho, S; Chochula, P; Christakoglou, P; Christensen, C H; Christiansen, P; Chujo, T; Cicalo, C; Cifarelli, L; Cindolo, F; Ciupek, M R; Clai, G; Cleymans, J; Colamaria, F; Colburn, J S; Colella, D; Collu, A; Colocci, M; Concas, M; Conesa Balbastre, G; Conesa Del Valle, Z; Contin, G; Contreras, J G; Coquet, M L; Cormier, T M; Cortese, P; Cosentino, M R; Costa, F; Costanza, S; Crochet, P; Cruz-Torres, R; Cuautle, E; Cui, P; Cunqueiro, L; Dainese, A; Danisch, M 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 M; Fiorenza, G; Flor, F; Flores, A N; Foertsch, S; Foka, P; Fokin, S; Fragiacomo, E; Frajna, E; Fuchs, U; Funicello, N; Furget, C; Furs, A; Gaardhøje, J J; Gagliardi, M; Gago, A M; Gal, A; Galvan, C D; Ganoti, P; Garabatos, C; Garcia, J R A; Garcia-Solis, E; Garg, K; Gargiulo, C; Garibli, A; Garner, K; Gasik, P; Gauger, E F; Gautam, A; Gay Ducati, M B; Germain, M; Ghosh, P; Ghosh, S K; Giacalone, M; Gianotti, P; Giubellino, P; Giubilato, P; Glaenzer, A M C; Glässel, P; Goh, D J Q; Gonzalez, V; González-Trueba, L H; G
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