Measurement of transverse Λ and (Λ)over-bar hyperon polarization in pPb collisions at √s_NN=5.02 TeV

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Aaij, R, Abdelmotteleb, ASW, Beteta, C Abellan, Abudinen, F, Ackernley, T, Adefisoye, AA, Adeva, B, Adinolfi, M, Adlarson, P, Agapopoulou, C et al (show 1123 more authors) , Aidala, CA, Ajaltouni, Z, Akar, S, Akiba, K, Albicocco, P, Albrecht, J, Alessio, F, Aliouche, Z, Cartelle, P Alvarez, Amalric, R, An, L, Andreianov, A, Andreola, P, Andreotti, M, Anelli, A, Ao, D, Archilli, F, Areg, Z, Argenton, M, Arguedas Cuendis, S, Artamonov, A, Artuso, M, Aslanides, E, Da Silva, R Ataide, Atzeni, M, Audurier, B, Bacher, D, Perea, I Bachiller, Bachmann, S, Bachmayer, M, Back, JJ, Baladron Rodriguez, P, Balagura, V, Balboni, A, Baldini, W, Balzani, L, Bao, H, Leite, J Baptista de Souza, Barbero Pretel, C, Barbetti, M, Barbosa, IR, Barlow, RJ, Barnyakov, M, Barsuk, S, Barter, W, Bartz, J, Bashir, S, Batsukh, B, Battista, PB, Bay, A, Beck, A, Becker, M, Bedeschi, F, Bediaga, IB, Behling, NA, Belin, S, Belous, K, Belov, I, Belyaev, I, Benane, G, Bencivenni, G, Ben-Haim, E, Berezhnoy, A, Bernet, R, Bernet Andres, S, Bertolin, A, Betancourt, C, Betti, F, Bex, J, Bezshyiko, Ia, Bezshyyko, O, Bhom, J, Bieker, MS, Biesuz, NV, Billoir, P, Biolchini, A, Birch, M, Bishop, FCR, Bitadze, A, Bizzeti, A, Blake, T, Blanc, F, Blank, JE, Blusk, S, Bocharnikov, V, Boelhauve, JA, Garcia, O Boente, Boettcher, T, Bohare, A, Boldyrev, A, Bolognani, CS, Bolzonella, R, Bonacci, RB, Bondar, N, Bordelius, A, Borgato, F, Borghi, S, Borsato, M, Borsuk, JT, Bottalico, E ORCID: 0000-0003-2238-8803, Bouchiba, SA, Bovill, M, Bowcock, TJV ORCID: 0000-0002-3505-6915, Boyer, A, Bozzi, C, Brandenburg, JD, Rodriguez, A Brea, Breer, N, Brodzicka, J, Brossa Gonzalo, A, Brown, J, Brundu, D, Buchanan, E, Buonincontri, L, Marcos, M Burgos, Burke, AT, Burr, C, Butter, JS, Buytaert, J, Byczynski, W, Cadeddu, S, Cai, H, Caillet, A, Calabrese, R, Calderon Ramirez, S, Calefice, L, Cali, S, Calvi, M, Calvo Gomez, M, Camargo Magalhaes, P, Cambon Bouzas, JI, Campana, P, Perez, DH Campora, Quezada, AF Campoverde, Capelli, S, 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Davidson, A, Davies, JE, Francisco, O De Aguiar, De Angelis, C, De Benedetti, F, de Boer, J, De Bruyn, K, De Capua, S, De Cian, M, De Freitas Carneiro Da Graca, U, De Lucia, E, De Miranda, JM, De Paula, L, De Serio, M, De Simone, P, De Vellis, F, de Vries, JA, Debernardis, F, Decamp, D, Dekkers, S, Del Buono, L, Delaney, B, Dembinski, H-P, Deng, J, Denysenko, V, Deschamps, O, Dettori, F, Dey, B, Di Nezza, P, Diachkov, I, Didenko, S, Ding, S, Ding, Y, Dittmann, L, Dobishuk, V, Docheva, AD, Dong, C, Donohoe, AM, Dordei, F, dos Reis, AC, Dowling, AD, Duan, W, Duda, P, Dudek, MW, Dufour, L, Duk, V, Durante, P, Duras, MM, Durham, JM, Durmus, OD, Dziurda, A, Dzyuba, A, Easo, S, Eckstein, E, Egede, U, Egorychev, A, Egorychev, V, Eisenhardt, S, Ejopu, E ORCID: 0000-0003-3711-7547, Eklund, L, Elashri, M, Ellbracht, J, Ely, S, Ene, A, Eschle, J, Esen, S, Evans, T, Fabiano, F, Faghih, S, Falcao, LN, Fang, B, Fantechi, R, Fantini, L, Faria, M, Farmer, K, Fazzini, D, Felkowski, L, Feng, M, Feo, M, 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Fernandez, S, Gomulka, W, Abrantes, F Goncalves, Goncerz, M, Gong, G, Gooding, JA, Gorelov, IV, Gotti, C, Govorkova, E, Grabowski, JP, Cardoso, LA Granado, Grauges, E, Graverini, E, Grazette, L, Graziani, G, Grecu, AT, Greeven, LM, Grieser, NA, Grillo, L, Gromov, S, Gu, C, Guarise, M, Guerry, L, Guliaeva, V, Guenther, PA, Guseinov, A-K, Gushchin, E, Guz, Y, Gys, T, Habermann, K, Hadavizadeh, T, Hadjivasiliou, C, Haefeli, G, Haen, C, Hallett, G, Hamilton, PM, Hammerich, J, Han, Q, Han, X, Hansmann-Menzemer, S, Hao, L, Harnew, N, Harris, TH, Hartmann, M, Hashmi, S, He, J, Hemmer, F, Henderson, C, Henderson, RDL, Hennequin, AM, Hennessy, K ORCID: 0000-0002-1529-8087, Henry, L, Herd, J, Gascon, P Herrero, Heuel, J, Hicheur, A, Mendizabal, G Hijano, Horswill, J, Hou, R, Hou, Y, Howarth, N, Hu, J, Hu, W, Hu, X, Hulsbergen, W, Hunter, RJ, Hushchyn, M, Hutchcroft, D ORCID: 0000-0002-4174-6509, Idzik, M, Ilin, D, Ilten, P, Inglessi, A, Iniukhin, A, Ishteev, A, Ivshin, K, Jage, H, Elles, SJ Jaimes, Jakobsen, S, Jans, E, Jashal, BK, Jawahery, A, Jevtic, V, Jiang, E, Jiang, X, Jiang, Y, Jiang, YJ, John, M, Rajan, A John Rubesh, Johnson, D, Jones, CR, Jones, TP, Joshi, S, Jost, B, Castella, J Juan, Jurik, N, Juszczak, I, Kaminaris, D, Kandybei, S, Kane, M, Kang, Y, Kar, C, Karacson, M, Karpenkov, D, Kauniskangas, A, Kautz, JW, Kazanecki, MK, Keizer, F, Kenzie, M, Ketel, T, Khanji, B, Kharisova, A, Kholodenko, S, Khreich, G, Kirn, T, Kirsebom, VS, Kitouni, O, Klaver, S, Kleijne, N, Klimaszewski, K, Kmiec, MR, Koliiev, S, Kolk, L, Konoplyannikov, A, Kopciewicz, P, Koppenburg, P, Korchin, A, Korolev, M, Kostiuk, I, Kot, O, Kotriakhova, S, Kozachuk, A, Kravchenko, P, Kravchuk, L, Kreps, M, Krokovny, P, Krupa, W, Krzemien, W, Kshyvanskyi, O, Kubis, S, Kucharczyk, M, Kudryavtsev, V, Kulikova, E, Kupsc, A, Kushnir, V, Kutsenko, B, Kyryllin, I, Lacarrere, D, Laguarta Gonzalez, P, Lai, A, Lampis, A, Lancierini, D, Landesa Gomez, C, Lane, JJ, Lanfranchi, G, Langenbruch, C, Langer, J, 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T, Nasteva, I, Needham, M, Nekrasova, E, Neri, N, Neubert, S, Neufeld, N, Neustroev, P, Nicolini, J, Nicotra, D, Niel, EM, Nikitin, N, Niu, Q, Nogarolli, P, Nogga, P, Normand, C, Novoa Fernandez, J, Nowak, G, Nunez, C, Nur, HN, Oblakowska-Mucha, A, Obraztsov, V, Oeser, T, Okamura, S, Okhotnikov, A, Okhrimenko, O, Oldeman, R, Oliva, F, Olocco, M, Onderwater, CJG, O'Neil, RH, Osthues, D, Otalora Goicochea, JM, Owen, P, Oyanguren, A, Ozcelik, O, Paciolla, F, Padee, A, Padeken, KO, Pagare, B, Pajero, T, Palano, A, Palutan, M, Pan, X, Panebianco, S, Panshin, G, Paolucci, L, Papanestis, A, Pappagallo, M, Pappalardo, LL, Pappenheimer, C, Parkes, C, Parmar, D, Passalacqua, B, Passaleva, G, Passaro, D, Pastore, A, Patel, M, Patoc, J, Patrignani, C, Paul, A, Pawley, CJ, Pellegrino, A, Peng, J, Altarelli, M Pepe, Perazzini, S, Pereima, D, Da Costa, H Pereira, Pereiro Castro, A, Perret, P, Perrevoort, A, Perro, A, Peters, MJ, Petridis, K, Petrolini, A, Pfaller, JP, Pham, H, Pica, L, Piccini, M, Piccolo, L, Pietrzyk, B, Pietrzyk, G, Pilato, RN ORCID: 0000-0002-4325-7530, Pinci, D, Pisani, F, Pizzichemi, M, Placinta, VM, Plo Casasus, M, Poeschl, T, Polci, F, Lener, M Poli, Poluektov, A, Polukhina, N, Polyakov, I, Polycarpo, E, Ponce, S, Popov, D, Poslavskii, S, Prasanth, K, Prouve, C, Provenzano, D, Pugatch, V, Punzi, G, Qasim, S, Qian, QQ, Qian, W, Qin, N, Qu, S, Quagliani, R, Trejo, RI Rabadan, Rademacker, JH, Rama, M, Garcia, M Ramirez, Ramos De Oliveira, V, Pernas, M Ramos, Rangel, MS, Ratnikov, F, Raven, G, Rebollo De Miguel, M, Redi, F, Reich, J, Reiss, F, Ren, Z, Resmi, PK, Ribalda Galvez, M, Ribatti, R, Ricart, GR, Riccardi, D, Ricciardi, S, Richardson, K, Richardson-Slipper, M, Rinnert, K, Robbe, P, Robertson, G, Rodrigues, E, Rodriguez Alvarez, A, Rodriguez Fernandez, E, Rodriguez Lopez, JA, Rodriguez, E Rodriguez, Roensch, J, Rogachev, A, Rogovskiy, A, Rolf, DL, Roloff, P, Romanovskiy, V, Romero Vidal, A, Romolini, G, Ronchetti, F, Rong, T, Rotondo, M, Roy, SR, Rudolph, MS, Diaz, M Ruiz, Ruiz Fernandez, RA, Vidal, J Ruiz, Saavedra-Arias, JJ, Saborido Silva, JJ, Sadek, R, Sagidova, N, Sahoo, D, Sahoo, N, Saitta, B, Salomoni, M, Sanderswood, I, Santacesaria, R, Santamarina Rios, C, Santimaria, M, Santoro, L, Santovetti, E, Saputi, A, Saranin, D, Sarnatskiy, A, Sarpis, G, Sarpis, M, Satriano, C, Satta, A, Saur, M, Savrina, D, Sazak, H, Sborzacchi, F, Scarabotto, A, Schael, S, Scherl, S, Schiller, M, Schindler, H, Schmelling, M, Schmidt, B, Schmitt, S, Schmitz, H, Schneider, O, Schopper, A, Schulte, N, Schulte, S, Schune, MH, Schwering, G, Sciascia, B, Sciuccati, A, Segal, I, Sellam, S, Semennikov, A, Senger, T, Soares, M Senghi, Sergi, A, Serra, N, Sestini, L, Seuthe, A, Sevilla Sanjuan, B, Shang, Y, Shangase, DM, Shapkin, M, Sharma, RS, Shchemerov, I, Shchutska, L, Shears, T ORCID: 0000-0002-2653-1366, Shekhtman, L, Shen, Z, Sheng, S, Shevchenko, V, Shi, B, Shi, Q, Shimizu, Y, Shmanin, E, Shorkin, R, Shupperd, JD, Coutinho, R Silva, Simi, G, 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Xing, TX, Xu, A, Xu, L, Xu, M, Xu, Z, Yang, K, Yang, X, Yang, Y, Yang, Z, Yeroshenko, V, Yeung, H, Yin, H, Yin, X, Yu, CY, Yu, J, Yuan, X, Yuan, Y, Zaffaroni, E, Zavertyaev, M, Zdybal, M, Zenesini, F, Zeng, C, Zeng, M, Zhang, C, Zhang, D, Zhang, J, Zhang, L, Zhang, R, Zhang, S, Zhang, Y, Zhang, YZ, Zhang, Z, Zhao, Y, Zhelezov, A, Zheng, SZ, Zheng, XZ, Zheng, Y, Zhou, T, Zhou, X, Zhou, Y, Zhovkovska, V, Zhu, LZ, Zhu, X, Zhu, Y, Zhukov, V, Zhuo, J, Zou, Q, Zuliani, D, Zunica, G, Amey, JL, Amato, S, Anderlini, L, Andersson, M and Amhis, Y (2025) Measurement of transverse Λ and (Λ)over-bar hyperon polarization in pPb collisions at √s_NN=5.02 TeV PHYSICAL REVIEW D, 112 (11). 112022-. ISSN 2470-0010, 2470-0029

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Abstract

The transverse polarization of Λ and (Formula Presented) hyperons is measured in pPb collisions collected by the LHCb experiment at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The polarization is averaged over hyperon transverse momentum in the range 0.15 < p<inf>T</inf> < 6.00 GeV=c, and Feynman-x in the ranges 0.005 < x<inf>F</inf> < 0.040 (forward region) and −0.10 < x<inf>F</inf> < −0.01 (backward region) defined relative to the proton beam direction. The transverse polarization is found to be compatible with zero for both Λ and Λ̄ hyperons. The results are also measured as a function of p<inf>T</inf> and x<inf>F</inf> with no significant dependence on these variables observed. The results are compared with previous experimental measurements at different center-of-mass energies and collision environments.

Item Type:	Article
Uncontrolled Keywords:	5107 Particle and High Energy Physics, 5101 Astronomical Sciences, 51 Physical Sciences
Divisions:	Faculty of Science & Engineering Faculty of Science & Engineering > School of Engineering Faculty of Science & Engineering > School of Physical Sciences Faculty of Science & Engineering > School of Physical Sciences > Physics Faculty of Science & Engineering > School of Engineering > Civil and Environmental Engineering
Depositing User:	Symplectic Admin
Date Deposited:	05 Jan 2026 09:46
Last Modified:	27 Jun 2026 00:06
DOI:	10.1103/rc6r-zt9q
Open Access URL:	https://journals.aps.org/prd/pdf/10.1103/rc6r-zt9q
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3196390
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