Precision measurement of the Ξ⁰_b baryon lifetime

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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 1188 more authors) , Aidala, CA, Ajaltouni, Z, Akar, S, Akiba, K, Albicocco, P, Albrecht, J, Aleksiejunas, R, Alessio, F, Cartelle, P Alvarez, Amalric, R, Amato, S, Amey, JL, Amhis, Y, An, L, Anderlini, L, Andersson, M, Andreola, P, Andreotti, M, Estrada, S Andres, Anelli, A, Ao, D, Archilli, F, Areg, Z, Argenton, M, Cuendis, S Arguedas, Artamonov, A, Artuso, M, Aslanides, E, Da Silva, R Ataide, Atzeni, M, Audurier, B, Authier, JA, Bacher, D, Perea, I Bachiller, Bachmann, S, Bachmayer, M, Back, JJ, Rodriguez, P Baladron, Balagura, V, Balboni, A, Baldini, W, Baldwin, Z, Balzani, L, Bao, H, Leite, J Baptista de Souza, Pretel, C Barbero, 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, 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Magalhaes, P Camargo, Bouzas, JI Cambon, Campana, P, Perez, DH Campora, Quezada, AF Campoverde, Capelli, S, Caporale, M, Capriotti, L, Caravaca-Mora, R, Carbone, A, Salgado, L Carcedo, Cardinale, R, Cardini, A, Carniti, P, Carus, L, Vidal, A Casais, Caspary, R, Casse, G ORCID: 0000-0002-8516-237X, Cattaneo, M, Cavallero, G, Cavallini, V, Celani, S, Celestino, I, Cesare, S, Lopes, F Cesario Laterza, Chadwick, AJ, Chahrour, I, Chang, H, Charles, M, Charpentier, Ph, Chatzianagnostou, E, Cheaib, R, Chefdeville, M, Chen, C, Chen, J, Chen, S, Chen, Z, Cherif, M, Chernov, A, Chernyshenko, S, Chiotopoulos, X, Chobanova, V, Chrzaszcz, M, Chubykin, A, Chulikov, V, Ciambrone, P, Vidal, X Cid, Ciezarek, G, Cifra, P, Clarke, PEL, Clemencic, M, Cliff, HV, Closier, J, Toapaxi, C Cocha, Coco, V, Cogan, J, Cogneras, E, Cojocariu, L, Collaviti, S, Collins, P, Colombo, T, Colonna, M, Comerma-Montells, A, Congedo, L, Connaughton, J, Contu, A, Cooke, N, Cordova, G, Coronel, C, Corredoira, I, Correia, A, 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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, Casani, A Fernandez, Gomez, M Fernandez, Fernez, AD, Ferrari, F, Rodrigues, F Ferreira, Ferrillo, M, Ferro-Luzzi, M, Filippov, S, Fini, RA, Fiorini, M, Firlej, M, Fischer, KL, Fitzgerald, DS, Fitzpatrick, C, Fiutowski, T, Fleuret, F, Fomin, A, Fontana, M, Foreman, LF, Forty, R, Foulds-Holt, D, Lima, V Franco, Sevilla, M Franco, Frank, M, Franzoso, E, Frau, G, Frei, C, Friday, DA, Fu, J, Fuhring, Q, Fulghesu, T, Galati, G, Galati, MD, Torreira, A Gallas, Galli, D, Gambetta, S, Gandelman, M, Gandini, P, Ganie, B, Gao, H, Gao, R, Gao, TQ, Martin, LM Garcia, Moreno, P Garcia, Pardinas, J Garcia, Gardner, P, Garg, KG, Garrido, L, Gaspar, C, Gavrikov, A, Gerken, LL, Gersabeck, E, Gersabeck, M, Gershon, T, Ghizzo, S, Ghorbanimoghaddam, Z, Giambastiani, L, Giasemis, FI, Gibson, V, Giemza, HK, Gilman, AL, Giovannetti, M, Gioventu, A, Girardey, L, Giza, MA, Glaser, FC, Gligorov, VV, Gobel, C, Golinka-Bezshyyko, L, Golobardes, E, Golubkov, D, Golutvin, A, Fernandez, S Gomez, Gomulka, W, Vaz, I Goncales, 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, Gunther, PA, Guseinov, A-K, Gushchin, E, Guz, Y, Gys, T, Habermann, K, Hadavizadeh, T, Hadjivasiliou, C, Haefeli, G, Haen, C, Haken, S, 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, Hedes, A, Hemmer, F, Henderson, C, Henderson, R, 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, Houston, DC, 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, Iniukhin, A, Iohner, A, Ishteev, A, Ivshin, K, Jage, H, Elles, SJ Jaimes, Jakobsen, S, Jans, E, Jashal, BK, Jawahery, A, Jayaweera, C, Jevtic, V, Jia, Z, Jiang, E, Jiang, X, Jiang, Y, Jiang, YJ, Moya, E Jimenez, Jindal, N, John, M, Rajan, A John Rubesh, Johnson, D, Jones, CR, Joshi, S, Jost, B, Castella, J Juan, Jurik, N, Juszczak, I, Kaminaris, D, Kandybei, S, Kane, M, Kang, Y, Kar, C, Karacson, M, 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, Klekots, DK, Klimaszewski, K, Kmiec, MR, Koliiev, S, Kolk, L, Konoplyannikov, A, Kopciewicz, P, Koppenburg, P, Korchin, A, Korolev, M, Kostiuk, I, Kot, O, Kotriakhova, S, Kowalczyk, E, Kozachuk, A, Kravchenko, P, 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Lucio, Luo, Y, Lupato, A, Luppi, E, Lynch, K, Lyu, X-R, Ma, GM, Maccolini, S, Machefert, F, Maciuc, F, Mack, B, Mackay, I, Mackey, LM, Mohan, LR Madhan, Madurai, MJ, Magdalinski, D, Maisuzenko, D, Malczewski, JJ, Malde, S, Malentacca, L, Malinin, A, Maltsev, T, Manca, G, Mancinelli, G, Mancuso, C, Escalero, R Manera, Manganella, FM, Manuzzi, D, Marangotto, D, Marchand, JF, Marchevski, R, Marconi, U, Mariani, E, Mariani, S, Benito, C Marin, Marks, J, Marshall, AM, Martel, L, Martelli, G, Martellotti, G, Martinazzoli, L, Martinelli, M, Gomez, D Martinez, Santos, D Martinez, Vidal, F Martinez, Martorell i Granollers, A, Massafferri, A, Matev, R, Mathad, A, Matiunin, V, Matteuzzi, C, Mattioli, KR, Mauri, A, Maurice, E, Mauricio, J, Mayencourt, P, de Cos, J Mazorra, Mazurek, M, McCann, M, McGrath, TH, McHugh, NT, Mcnab, A, McNulty, R, Meadows, B, Meier, G, Melnychuk, D, Granada, D Mendoza, Perez, P Menendez Valdes, Meng, FM, Merk, M, Merli, A, Garcia, L Meyer, Miao, D, Miao, H, Mikhasenko, M, Milanes, DA, Minotti, A, Minucci, E, Miralles, T, Mitreska, B, Mitzel, DS, Modak, A, Moeser, L, Moise, RD, Cardenas, EF Molina, Mombacher, T, Monk, M, Monteil, S, Gomez, A Morcillo, Morello, G, Morello, MJ, Morgenthaler, MP, Moron, J, Morren, W, Morris, AB, Morris, AG, Mountain, R, Mu, H, Mu, ZM, Muhammad, E, Muheim, F, Mulder, M, Muller, K, Munoz-Rojas, F, Murta, R, Mytrochenko, V, Naik, P ORCID: 0000-0001-6977-2971, Nakada, T, Nandakumar, R, Nanut, T, Nasteva, I, Needham, M, Nekrasova, E, Neri, N, Neubert, S, Neufeld, N, Neustroev, P, Nicolini, J, Nicotra, D, Niel, EM, Nikitin, N, Nisi, L, Niu, Q, Nogarolli, P, Nogga, P, Normand, C, Fernandez, J Novoa, Nowak, G, Nunez, C, Nur, HN, Oblakowska-Mucha, A, Obraztsov, V, Oeser, T, Okhotnikov, A, Okhrimenko, O, Oldeman, R, Oliva, F, Pino, E Olivart, Olocco, M, Onderwater, CJG, O'Neil, RH, Soto, JS Ordonez, Osthues, D, Goicochea, JM Otalora, Owen, P, Oyanguren, A, Ozcelik, O, Paciolla, F, Padee, A, Padeken, KO, Pagare, B, Pajero, T, Palano, A, Palutan, M, Pan, C, 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, Peng, X, Altarelli, M Pepe, Perazzini, S, Pereima, D, Da Costa, H Pereira, Martinez, M Pereira, Castro, A Pereiro, Perez, C, Perret, P, Perrevoort, A, Perro, A, Peters, MJ, Petridis, K, Petrolini, A, Pezzulo, S, 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, Casasus, M Plo, 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, Pybus, JR, Qasim, S, Qian, QQ, Qian, W, Qin, N, Qu, S, Quagliani, R, Trejo, RI Rabadan, Racz, R, Rademacker, JH, 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Zamora, Zavertyaev, M, Zdybal, M, Zenesini, F, Zeng, C, Zeng, M, Zhang, C, Zhang, D, Zhang, J, Zhang, L, Zhang, R, Zhang, S, 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, X, Zhu, Y, Zhukov, V, Zhuo, J, Zou, Q, Zuliani, D, Zunica, G, Gao, Y and Xu, L (2025) Precision measurement of the Ξ⁰_b baryon lifetime PHYSICAL REVIEW D, 112 (5). 052012-. ISSN 2470-0010, 2470-0029

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Abstract

A sample of pp collision data, corresponding to an integrated luminosity of 5.4 fb⁻¹ and collected by the LHCb experiment during LHC Run 2, is used to measure the ratio of the lifetime of the Ξ⁰<inf>b</inf> baryon to that of the Λ⁰<inf>b</inf> baryon, (Formula presented). The value r^Run <inf>τ</inf> ² ¼ 1.004 ± 0.009 ± 0.006 is obtained, where the first uncertainty is statistical and the second systematic. This value is averaged with the corresponding value from Run 1 to obtain r<inf>τ</inf> ¼ 1.004 ± 0.008 ± 0.005. Multiplying by the known value of the Λ⁰<inf>b</inf> lifetime yields τ<inf>Ξ</inf>0 ¼ 1.475 ± 0.012 ± 0.008 ± 0.009 ps, where the last uncertainty is due to the limited knowledge b of the Λ⁰<inf>b</inf> lifetime. This measurement improves the precision of the current world average of the Ξ⁰<inf>b</inf> lifetime by about a factor of two, and is in good agreement with the most recent theoretical predictions.

Item Type:	Article
Uncontrolled Keywords:	5107 Particle and High Energy Physics, 5101 Astronomical Sciences, 51 Physical Sciences
Divisions:	Faculty of Humanities & Social Sciences 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 Humanities & Social Sciences > School of the Arts Faculty of Humanities & Social Sciences > School of the Arts > Architecture Faculty of Science & Engineering > School of Engineering > Civil and Environmental Engineering
Depositing User:	Symplectic Admin
Date Deposited:	13 Oct 2025 08:02
Last Modified:	16 Jun 2026 07:11
DOI:	10.1103/sllb-p3j8
Open Access URL:	https://journals.aps.org/prd/pdf/10.1103/sllb-p3j8
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3194810
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