| Title: | Observation of Λ Hyperon Local Polarization in 𝑝Pb Collisions at √𝒔<sub>NN</sub> = 8.16 TeV |
| Authors: | Hayrapetyan, A Tumasyan, A Adam, W Andrejkovic, JW Benato, L Bergauer, T Chatterjee, S Damanakis, K Dragicevic, M Hussain, PS Jeitler, M Roberts, A Ryou, Y Sunar Cerci, D Liang, Z Chen, Z Kazana, M Mariotti, C Cheung, HWK Zarubin, A Jang, W Koraka, CK Ban, Y Yalvac, M Cerati, GB Milosevic, V Sanders, S Tapper, A Hinzmann, A Dejardin, M Molnar, J Torres Da Silva De Araujo, F Quinnan, M Gill, K Laurila, S Lee, H Vaucelle, P Townsend, A Araujo, M Lau, KT Wiedenbeck, S Troiano, D Sanchez Cruz, S Longo, L Lee, J Bedoya, CF Wulansatiti, M Aimè, C Kveton, A Bistany-riebman, J Waltenberger, W Huwiler, M Bak, G Hensel, C Beauceron, S Schmitt, MH Lipinski, M Liko, D Giacomelli, P Krutelyov, V Ortona, G Orlandi, F Ellis, KV Kaur, A Tytgat, M Zaleski, S Buontempo, S Carretero, OM Chaudhary, G Hirosky, R Dziwok, C Selivanova, D Flügge, G Tok, UG Pelliccioni, M Arneodo, M Kirschenmann, H Urda Gómez, L Koenig, E Kim, J Hsia, HW Safonov, A Wissing, C Baringer, P Scarfi, S Rantanen, MM Mazumdar, K Kress, T Sekhar, S Tuominiemi, J Lawhorn, JM Wolf, M Orfanelli, S Tsamalaidze, Z Bandyopadhyay, H Martinez Ruiz del Arbol, P Petkov, P Damgov, J Popescu, S Galli, M Tsai, LS Nowack, A Raicevic, N Haubrich, N Alcerro Alcerro, LF Vaish, KY Stenson, K Gokbulut, G Merlin, JA Gomez-Ceballos, G Ramírez García, M De Roeck, A Alcaraz Maestre, J Barbagli, G Soto Rodríguez, A Zhizhin, I Jiang, CH Huber, B Stamenkovic, M Cumalat, JP Uribe Estrada, C Malberti, M Tao, J Lath, A Karjavine, V De Lentdecker, G Eskut, E Chandra, S Gu, Y Verma, S Mitra, S Strautnieks, NR Alvarez Gonzalez, B Jakovcic, K Pooth, O Uchida, K Kapoor, A Glowacki, M Errico, F Allmond, B Rusack, R Colling, D Merlo, J-P Szleper, M Lindén, T Tuo, S Fernandez Menendez, J Russell, T Bardelli, G Korotkikh, V Wenzl, DA Azzi, P Anthony, D Heath, HF Li, AJ Acosta, D Presilla, M Sastre, J Susa, T Costa, M Camaiani, B Ziemons, T Wei, K Vander Donckt, M Lee, K Menendez, N Walkingshaw Pass, K Cassese, A Saoulidou, N Andreev, Y Kayis Topaksu, A Denegri, D Yi, R Sexton-Kennedy, E Abdelalim, AA Vourliotis, E Bucci, R Schleper, P Lu, C Apresyan, A Soha, A Ceccarelli, R Alimena, J Gurpinar Guler, E Marchese, L Lincoln, D Ciulli, V Toms, M Haeberle, R Bartek, R Safdari, M Link, M Hollar, J Scham, M Kaur, H Pantaleo, F Carrillo Montoya, CA Abbrescia, M Oh, YD Hazarika, P Laha, A Barbosa Trujillo, DA Rappoccio, S Goy Lopez, S Gonzalez Lopez, O Nielsen, C Mankel, A Amram, O Markovic, L Petyt, D Zhao, J Zotz, A Royon, C Brigljevic, V Holmberg, M-L Ascioti, ME Montalvo, R Civinini, C Hadley, NJ Sehrawat, A De Wit, A Menasce, D Mallios, S Yu, D Botta, C Favart, L Lam, T Otarid, Y Shvetsov, I Nash, K Pradeep, PB Albrow, M Del Re, D Grynyov, B James, T Linacre, J Lipton, R Bruno, G Mcalister, I Fiorendi, S D’Alessandro, R Colaleo, A Nunez Del Prado, A Tiras, E Routray, H Pinna, D Foudas, C Focardi, E Bonanomi, M Borgonovi, L Azzurri, P Beyrouthy, T Gu, A Oropeza Barrera, C Herwig, TC Vellidis, K Palluotto, S Mastrapasqua, P Pandolfi, F Lobanov, A Masterson, P Damas, F Bonilla, J Sonawane, M Cerrada, M Joshi, BM Chwalek, T Bauerdick, LAT Albrecht, A Goncharov, M Quast, G Almond, J Feng, Y Selvaggi, M Neukum, M Moore, C Faure, JL Haller, J Auffray, E Shelake, M Bossini, E Martins, J Komurcu, Y Park, IC Bortolato, G Katsoulis, P Kello, T Amram, D Wagner, SR Munoz Diaz, C Howard, A Mariano, J Estevez Banos, LI Rosowsky, A Ulmer, KA Petrucciani, G Berry, D Varela, J Harris, P Matthewman, M Kwan, S Latino, G Lenzi, P Bethani, A Bozzo, M Kara, O Mannelli, M Covarelli, R Antchev, G Campana, M Bonacorsi, D Aushev, T Brown, CE Ranken, E Dharmaratna, WGD Das, A Zipper, N Nanda, S Connor, P Lee, S Martikainen, L Hofman, DJ Gritsan, AV Maier, S Senger, M Perego, A Bartosik, N Dominguez, A Grzanka, L Treille, D Kiani, B Tamulaitis, G Wightman, A Zisopoulos, I Xiao, M Zuolo, D Lizzo, M Meschini, M Korenkov, V Karneyeu, A Bagliesi, G Amoroso, S Kosmoglou Kioseoglou, PG Hartmann, F Misheva, M Kalbhor, P Janot, P Melzer-Pellmann, I-A Fanò, L Antonello, M Perovic, V Avery, P Riti, F Breedon, R Gallo, E Sanchez, A Aldá Júnior, WL Navarro Tobar, Á Paoletti, S Papanastassiou, A Dauncey, P Meneguzzo, AT Khazaie, E Pfeiffer, A Sowa, L Palencia Cortezon, E Bautista, I Sultanov, G Cheng, C Goldstein, J Sguazzoni, G Lascio, S Carnevali, F Zaza, A Shumka, E Aarup Petersen, H Asawatangtrakuldee, C Giani, S Viliani, L Nayak, S Grünendahl, S Tae, B Yohay, R Rabbertz, K Liu, T Fokow, P Dhingra, N Blanco Fernández, S Bansal, S Varghese, S Franzoni, G Krohn, M Sorrentino, G Monti, F Masetti, G Benussi, L Dozen, C Demiragli, Z Sharma, A Mormile, M Thomas-Wilsker, J Ko, B Salerno, R Pierini, M Kumar, A Brooke, JJ Alhusseini, M Verma, P Folgueras, S Fontana Santos Alves, BA d’Enterria, D Paasch, A Brücken, E Kaluzinska, O Heredia-De La Cruz, I Terkulov, A Lelas, D Kharchilava, A Awais, A Agapitos, A Crossman, B Dermenev, A Mohammed, Y Levin, A Tsipolitis, G Sarkar, S Parolia, S Skovpen, K Shen, X Liyanage, K Ivanov, K Gomes De Souza, R Bastos, D Venkatasubramanian, N Nicolaou, C Raidal, M Brinkerhoff, A Abbiendi, G Calligaris, L Stafford, D Pazzini, J Higginbotham, S Louka, M Yu, I Simsek, AE Bhatnagar, V Wu, HY Reichert, J Colombina, F Lamichhane, K Dervan, J Colino, N Yockey, H Tran, TT Das, P Zacharopoulou, A Vila, I Bianchini, L Bianco, S Petrushanko, S Hatakeyama, K Kapsiak, C Song, JN Sutantawibul, C Holmes, T Ciangottini, D Han, S Márton, K Tizchang, S Oreshkin, V Trevisani, N Gogate, N Butz, E Bahinipati, S Blekman, F Novak, A Li, J CMS collaboration Kazhykarim, Y Meola, S Berryhill, J Isik, C Clement, E Mendizabal Morentin, M Mei, H Akgun, B Mondal, S Breugelmans, N Zhao, Y Madrid, C Sekmen, S Piccolo, D Lai, Y Alves Gallo Pereira, M Finco, L Longo, E Nadderd, L Terrill, W Nissan, Y Bam, B Murzin, V Vardanyan, I Tomalin, IR Gorbunov, I Ferro, F Maietto Silverio, I Sikdar, AK Mignerey, AC Lu, R-S Liu, J Tsionou, D Radogna, R Hegde, V Dimova, T Mora Herrera, C Wezenbeek, L Capiluppi, P Dierlamm, A Pujahari, PR Mohammadi, A Chen, X Bharthuar, S Vanlaer, P Herndon, M Paramatti, R Bachtis, M Bencze, G Campos, D Meyer, AB Venditti, R Martinez Rivero, C Kieseler, J Vats, D Leyva Pernia, D Neogi, O Robutti, E Maeshima, K Kaur, A Robmann, P Harper, S Harder, K Jana, P Chawla, R Carnahan, T Yu, SS El Morabit, K Eusebi, R Dancu, JS Würthwein, F Gribushin, A Zhang, J Yanes, E Orzari, B Tosi, S León Holgado, J Thieman, J Choi, J Fanfani, A Rumerio, P Zygala, L Richman, J Benaglia, A Dreimanis, K Mestvirishvili, A Kim, HS Zhang, L Mokhtar, F Muraleedharan Nair Bindhu, VK Alexander, J Schieck, J Lidrych, J Papakrivopoulos, I Vanden Bemden, M Rabady, D Isildak, B Strait, J Vetens, W Gilmore, J D’Anzi, B Brivio, F Spitzbart, D Milella, G Padula, SS Tavernier, S Cetorelli, F Yetkin, T Gülmez, E Gomber, B Koppenhöfer, R Puerta Pelayo, J Herve, A Sun, X Zanetti, M Chenarani, S Shopova, M Alves, GA Gutsche, O Hosseini, Y Boccali, T Oh, M Qin, X Portales, L Szillasi, Z Boos, E Canepa, A Dittmann, J De Guio, F Ille, B Gavrilov, V Mishra, S Di Mattia, A David, A Jun, W Geiser, A Salyer, K Cai, H Fischer, Y Marozzo, GB Nogima, H Darwish, MR Nunez Ornelas, M Shchelina, K Wiens, L Roguljic, M Freeman, J Tropea, P Negro, G Aleksandrov, A Wang, Z Dinardo, ME Alsufyani, B Papadimitriou, V Oh, G Kiminsu, U Korytov, A Snyder, C Branson, JG Matorras, F Carrigan, M Walter, D Martin Perez, C Yi, K Stadie, H Tani, L Kim, S Scribano, A Sagir, S Cakir, A Mundim, L Keshri, S Depasse, P Tauqeer, K Loveless, R Wanczyk, J Meschi, E Mohammadi Najafabadi, M Hawksworth, M Organtini, G Ledovskoy, A Naskar, K Nabili, S Wildridge, A Ptochos, F Bhattacharya, S Wang, J Khein, L Lu, N Chen, Y Mecca, A Lee, H Musich, M Schöfbeck, R Komaragiri, JR Taliercio, A Brennan, L Lee, Y Blinov, V Ecklund, KM Dogra, S Parida, B Simkina, P Hadley, M Verdini, PG Devetak, D Kaynak, B Giorgetti, S Vaandering, EW Bala, A Ford, WT Ershov, A Reimers, A Wozniak, KA Zhang, H My, S Li, Y Nibigira, E Malcles, J Gennai, S Rogan, C Chernyavskaya, N Carlin, R Karunarathna, N Tkaczyk, S Lee, R Greene, S Da Molin, G Goerlach, U Anguiano, J Valuev, V Yusuff, I Vaselli, F Wuchterl, S Zehetner, P Fouz, MC Saltzberg, D Kim, MS Van Putte, S Langford, J Kyberd, P Rykaczewski, H Bakas, G Pedro, K Sharma, R Glege, F Mariani, V Klute, M Suarez, I Siikonen, H Spanier, S Spagnolo, P Santpur, SN Salvi, G Argiro, S D’Alfonso, M Margjeka, I De Favereau De Jeneret, J Heyen, F Casarsa, M Gray, L Della Negra, M Pauss, F Roland, G Fasanella, D Shadskiy, N Maier, B Pizzati, G Mocellin, G Collard, C Kim, YW Giljanovic, D Aebi, D Van Onsem, GP Zejdl, P Zeuner, WD Fernández Manteca, PJ Painesis, Z Sathia Narayanan, BV Cankocak, K Ignatenko, M Roh, Y Checchia, P Zabolotny, W Pacher, L Fontanesi, E Cousins, R Kang, L Fiorina, D Ozdemir, K Kirsanov, M Rizzi, A Kaya, M Oshiro, M Velasco, M Wilson, J Hacisahinoglu, B Martin Viscasillas, E Newbold, DM Salur, S Richards, A Bevilacqua, T Caminada, L Le Mahieu, C 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Rygaard, L Kontaxakis, P Kwon, H Chang, P Tali, B Das, I Baechler, J Thachayath, A Solano, A Williams, A Behera, PK Kogler, R Zorbakir, IS Singh, JB Paramesvaran, S Davis, J Moral Figueroa, K Pathak, A Liu, Z-A Dodonova, A Gomez, G Wan, Y Jeon, S Li, B Hart, A Bose, T Murray, M Kotamnives, P Davies, G Wang, D Leutgeb, E Roy, D Demiyanov, A Creanza, D Pigazzini, S Yoo, HD Bayatmakou, M Piperov, S Komm, M Yan, F Ahmed, A Castro, A Bornheim, A Cerri, O Kim, Y Delaere, C Scodellaro, L Bakshi, AS Adams, T Krammer, N Kar, C Quaranta, C Lychkovskaya, N Tramontano, R Nelson, H Etesami, SM Becerril Gonzalez, H Pfeffer, E Wachirapusitanand, V Bloom, K Aruta, C Paraskevas, I Cussans, D Overton, D Bashiri, S Mohrman, K Lassila-Perini, K Reissel, C Banerjee, S Hashmi, R Kellogg, RG Williams, T Onel, Y Behnke, O Latorre, A Mao, J Marini, AC Chinellato, J Klijnsma, T Glessgen, F Fayer, S Perez, CU Ojalvo, I Macchiolo, A Grummer, A Prifti, E Ally, D Lange, J Virdi, AK Makarenko, I Geurts, FJM Kang, DY Morse, DM Newman, HB Reales Gutiérrez, G Mahmoud, MA Alyari, M Erbacher, R Scheurer, V Boletti, A Sculac, T Juodagalvis, A Mascellani, A Shmatov, S Spiropulu, M Nemes, F Zhou, C Duarte, J Castaneda Hernandez, A Eble, F Cardwell, B Vlimant, JR Yuan, L Park, J Belyaev, A Elicabuk, U Robertshaw, L Walsh, R Mahon, D Wardle, N Hildreth, M Mondal, S Elmer, P Chatterjee, S Landsberg, G Jung, AW Yagil, A Wang, C Singh, N Ganjour, S Christoforou, K Romeo, F Fraga, J Dabrowski, A Schulte, JF Hiltbrand, J Malakhov, A Von Cube, RF Fangmeier, C Miao, Y Bin Anuar, AA Mersi, S Gonzalez Caballero, I Olsen, J Wulz, C-E Bellora, A Kadlecsik, Á Chatterjee, RM Long, K Bubanja, I Ameen, MM Morcillo Perez, CM Awan, MIM Chahal, GS Sokmen, G Barone, G Yoo, J Wulff, JW Osherson, M Rahatlou, S Watson, IJ Liu, G De La Cruz, B Sánchez Navas, S Veelken, C Qian, S Gharbia, Y Buchot Perraguin, A Hakimi, A Ragazzi, S Flores Avila, G Lehti, S Uttley, GP Velkovska, J Lucchini, MT Nessi-Tedaldi, F Margoni, M Maity, D 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Zghiche, A Kachanov, V Rawal, N Roland, C Kilminster, B Lipka, K Das, AK Zimermmane Castro Santos, A Sözbilir, Ü Huh, C Tziaferi, E Vizan Garcia, JM Dimitrov, A Hakala, J Smith, C De Palma, M Singh, RK Clare, R Aldaya Martin, M Liu, M Kunnawalkam Elayavalli, R Schwarz, D Alazemi, F Belloni, A Stein, A Cerci, S Chen, HS Babbar, J Bilei, GM |
| Keywords: | relativistic heavy-ion collisions;hyperons;polarization;nuclear experiment (nucl-ex);high energy physics - experiment (hep-ex) |
| Issue Date: | 23-Sep-2025 |
| Publisher: | American Physical Society (APS) |
| Citation: | Hayrapetyan, A. et al. for the benefit of the CMS collaboration (2025) 'Observation of Λ Hyperon Local Polarization in 𝑝Pb Collisions at √𝒔<sub>NN</sub> = 8.16 TeV', Physical Review Letters, 135 (13), 132301, pp. 1–21. doi: 10.1103/6ywq-gm61. |
| Series/Report no.: | Report number;CMS-HIN-24-002, CERN-EP-2024-328 |
| Abstract: | The polarization of the Λ and ¯Λ hyperons along the beam direction has been measured in proton-lead (𝑝-Pb) collisions at a center-of-mass energy per nucleon pair of 8.16 TeV. The data were obtained with the CMS detector at the LHC and correspond to an integrated luminosity of 186.0 ± 6.5 nb⁻¹. A significant azimuthal dependence of the hyperon polarization, characterized by the second-order Fourier sine coefficient 𝑃<sub>𝑧,s2</sub>, is observed. The 𝑃<sub>𝑧,s2</sub> values decrease as a function of charged particle multiplicity, but increase with transverse momentum. A hydrodynamic model that describes the observed 𝑃<sub>𝑧,s2</sub> values in nucleus-nucleus collisions by introducing vorticity effects does not reproduce either the sign or the magnitude of the 𝑝-Pb results. These observations pose a challenge to the current theoretical implementation of spin polarization in heavy ion collisions and offer new insights into the origin of spin polarization in hadronic collisions at LHC energies. |
| Description: | A version of the article is available at arXiv:2502.07898v2 [nucl-ex] (https://arxiv.org/abs/2502.07898). Comments: Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at https://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-24-002 (CMS Public Pages). Report number: CMS-HIN-24-002, CERN-EP-2024-328. Journal reference: Phys. Rev. Lett. 135 (2025) 132301. Submission history: From: The CMS Collaboration: [v1] Tue, 11 Feb 2025 19:09:55 UTC (556 KB); [v2] Wed, 1 Oct 2025 12:27:55 UTC (557 KB). Data availability—
Release and preservation of data used by the CMS Collaboration as the basis for publications is guided by the CMS data preservation, reuse, and open access policy [79]. CMS data availability statement, 10.7483/OPENDATA.CMS.1BNU.8V1W . |
| URI: | https://bura.brunel.ac.uk/handle/2438/32983 |
| DOI: | https://doi.org/10.1103/6ywq-gm61 |
| ISSN: | 0031-9007 |
| Other Identifiers: | ORCiD: Joanne E. Cole https://orcid.org/0000-0001-5638-7599 ORCiD: Akram Khan https://orcid.org/0000-0002-4597-4402 ORCiD: Paul Kyberd https://orcid.org/0000-0002-7353-7090 ORCiD: Ivan D. Reid https://orcid.org/0000-0002-9235-779X |
| Appears in Collections: | Department of Electronic and Electrical Engineering Research Papers
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