Observation of the Λ_b⁰ → J/ψ Ξ^- K⁺ and Ξ_b⁰ → J/ψ Ξ^- π⁺ decays

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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 1120 more authors) , Aidala, CA, Ajaltouni, Z, Akar, S, Akiba, K, Albicocco, P, Albrecht, J, Alessio, F, Alexander, M, Aliouche, Z, Cartelle, P Alvarez, Amalric, R, Amato, S, Amey, JL, Amhis, Y, An, L, Anderlini, L, Andersson, M, Andreianov, A, Andreola, P, Andreotti, M, Andreou, D, Anelli, A, Ao, D, Archilli, F, 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, Basels, JM, Bashir, S, Bassi, G, Batsukh, B, Battista, PB, Bay, A, Beck, A, Becker, M, Bedeschi, F, Bediaga, IB, Behling, NA, Belin, S, 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Cambon Bouzas, JI, Campana, P, Perez, DH Campora, Quezada, AF Campoverde, Capelli, S, Capriotti, L, Caravaca-Mora, R, Carbone, A, Carcedo Salgado, L, 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, Cesare, S, Chadwick, AJ, Chahrour, I, Charles, M, Charpentier, Ph, Chatzianagnostou, E, Chefdeville, M, Chen, C, Chen, S, Chen, Z, 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, MC, Comerma-Montells, A, Congedo, L, Contu, A, Cooke, N, Corredoira, I, Correia, A, Corti, G, Meldrum, JJ Cottee, Couturier, B, Craik, DC, Cruz Torres, M, Rivera, E Curras, Currie, R, Da Silva, CL, Dadabaev, S, Dai, L, Dai, X, Dall'Occo, E, Dalseno, J, D'Ambrosio, C, Daniel, J, Danilina, A, d'Argent, P, Darze, G, 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, Dedu, V, 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, 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, Falcao, LN, Fan, Y, Fang, B, Fantini, L, Faria, M, Farmer, K, Fazzini, D, Felkowski, L, Feng, M, Feo, M, Fernandez Casani, A, Fernandez Gomez, M, Fernez, AD, Ferrari, F, Ferreira Rodrigues, F, Ferrillo, M, Ferro-Luzzi, M, Filippov, S, Fini, RA, Fiorini, M, Firlej, M, Fischer, KL, Fitzgerald, DS, Fitzpatrick, C, Fiutowski, T, Fleuret, F, Fontana, M, Foreman, LF, Forty, R, Foulds-Holt, D, Franco Lima, V, Sevilla, M Franco, Frank, M, Franzoso, E, Frau, G, Frei, C, Friday, DA, Fu, J, Fuhring, Q, Fujii, Y, Fulghesu, T, Gabriel, E, Galati, G, Galati, MD, Gallas Torreira, A, Galli, D, Gambetta, S, Gandelman, M, Gandini, P, Ganie, B, Gao, H, Gao, R, Gao, TQ, Gao, Y, Garcia Martin, LM, Garcia Moreno, P, Garcia Pardinas, J, Gardner, P, Garg, KG, Garrido, L, Gaspar, C, Gerken, LL, Gersabeck, E, Gersabeck, M, Gershon, T, Ghizzo, SG, Ghorbanimoghaddam, Z, Giambastiani, L, Giasemis, FI, Gibson, V, Giemza, HK, Gilman, AL, Giovannetti, M, Gioventu, A, Girardey, L, Giugliano, C, Giza, MA, Gkougkousis, EL, Glaser, FC, Gligorov, VV, Gobel, C, 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Mueller, K, Munoz-Rojas, F, Murta, R, Naik, P ORCID: 0000-0001-6977-2971, Nakada, T, Nandakumar, R, Nanut, T, Nasteva, I, Needham, M, Neri, N, Neubert, S, Neufeld, N, Neustroev, P, Nicolini, J, Nicotra, D, Niel, EM, Nikitin, N, 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, Pais, PR, Pajero, T, Palano, A, Palutan, M, Pan, X, 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, V, 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, 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, Ruiz Diaz, M, Ruiz Fernandez, RA, Vidal, J Ruiz, Ryzka, J, 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, Smead, LG Scantlebury, 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, Schwemmer, R, 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, 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, Simone, S, Skidmore, N, Skwarnicki, T, Slater, MW, Smallwood, JC, Smith, E, Smith, K, Smith, M, Snoch, A, Lavra, L Soares, Sokoloff, MD, Soler, FJP, Solomin, A, Solovev, A, Solovyev, I, Sommerfeld, NS, Song, R, Song, Y, Song, YS, De Almeida, FL Souza, Souza De Paula, B, Norella, E Spadaro, Spedicato, E, Speer, JG, Spiridenkov, E, Spradlin, P, Sriskaran, V, Stagni, F, Stahl, M, Stahl, S, Stanislaus, S, Stefaniak, M, Stein, EN, Steinkamp, O, Stenyakin, O, Stevens, H, Strekalina, D, Su, Y, Suljik, F, Sun, J, Sun, L, Sundfeld, D, Sutcliffe, W, Swallow, PN, Swientek, K, Swystun, F, Szabelski, A, Szumlak, T, Tan, Y, Tang, Y, Tat, MD, Terentev, A, Terzuoli, F, Teubert, F, Thomas, E, Thompson, DJD, Tilquin, H, Tisserand, V, T'Jampens, S, Tobin, M, Tomassetti, L, Tonani, G, Tong, X, Tork, T, Torres Machado, D, Toscano, L, Tou, DY, Trippl, C, Tuci, G, Tuning, N, Uecker, LH, Ukleja, A, 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H, Wu, J, Wu, X, Wu, Y, Wu, Z, Wyllie, K, Xian, S, Xiang, Z, Xie, Y, Xing, TX, Xu, A, Xu, L, Xu, M, Xu, Z, Yang, K, Yang, S, 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, 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, Zhukov, V, Zhuo, J, Zou, Q, Zuliani, D and Zunica, G (2025) Observation of the Λ_b⁰ → J/ψ Ξ^- K⁺ and Ξ_b⁰ → J/ψ Ξ^- π⁺ decays EUROPEAN PHYSICAL JOURNAL C, 85 (7). 812-. ISSN 1434-6044, 1434-6052

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Abstract

The first observation of the Ξb0→J/ψΞ-π+ decay and the most precise measurement of the branching fraction of the Λb0→J/ψΞ-K+ decay are reported, using proton-proton collision data from the LHCb experiment collected in 2016–2018 at a centre-of-mass energy of 13\,TeV, corresponding to an integrated luminosity of 5.4\,fb-1. Using the Λb0→J/ψΛ and Ξb-→J/ψΞ- decays as normalisation channels, the ratios of branching fractions are measured to be (Formula presented.) where the first uncertainty is statistical and the second systematic.

Item Type:	Article
Uncontrolled Keywords:	5107 Particle and High Energy Physics, 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:	09 Dec 2025 09:05
Last Modified:	23 May 2026 10:28
DOI:	10.1140/epjc/s10052-025-14129-6
Open Access URL:	https://link.springer.com/content/pdf/10.1140/epjc...
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3196000
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