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Observation of a J/ψΛ Resonance Consistent with a Strange Pentaquark Candidate in B^{-}→J/ψΛp[over ¯] Decays.
R Aaij, A S W Abdelmotteleb, C Abellan Beteta, F Abudinén, T Ackernley, B Adeva, M Adinolfi, P Adlarson, H Afsharnia, C Agapopoulou, C A Aidala, Z Ajaltouni, S Akar, K Akiba, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, Z Aliouche, P Alvarez Cartelle, R Amalric, S Amato, J L Amey, Y Amhis, L An, L Anderlini, M Andersson, A Andreianov, M Andreotti, D Andreou, D Ao, F Archilli, A Artamonov, M Artuso, E Aslanides, M Atzeni, B Audurier, S Bachmann, M Bachmayer, J J Back, A Bailly-Reyre, P Baladron Rodriguez, V Balagura, W Baldini, J Baptista de Souza Leite, M Barbetti, R J Barlow, S Barsuk, W Barter, M Bartolini, F Baryshnikov, J M Basels, G Bassi, B Batsukh, A Battig, A Bay, A Beck, M Becker, F Bedeschi, I B Bediaga, A Beiter, V Belavin, S Belin, V Bellee, K Belous, I Belov, I Belyaev, G Benane, G Bencivenni, E Ben-Haim, A Berezhnoy, R Bernet, S Bernet Andres, D Berninghoff, H C Bernstein, C Bertella, A Bertolin, C Betancourt, F Betti, Ia Bezshyiko, S Bhasin, J Bhom, L Bian, M S Bieker, N V Biesuz, S Bifani, P Billoir, A Biolchini, M Birch, F C R Bishop, A Bitadze, A Bizzeti, M P Blago, T Blake, F Blanc, J E Blank, S Blusk, D Bobulska, J A Boelhauve, O Boente Garcia, T Boettcher, A Boldyrev, C S Bolognani, R Bolzonella, N Bondar, F Borgato, S Borghi, M Borsato, J T Borsuk, S A Bouchiba, T J V Bowcock, A Boyer, C Bozzi, M J Bradley, S Braun, A Brea Rodriguez, J Brodzicka, A Brossa Gonzalo, J Brown, D Brundu, A Buonaura, L Buonincontri, A T Burke, C Burr, A Bursche, A Butkevich, J S Butter, J Buytaert, W Byczynski, S Cadeddu, H Cai, R Calabrese, L Calefice, S Cali, R Calladine, M Calvi, M Calvo Gomez, P Campana, D H Campora Perez, A F Campoverde Quezada, S Capelli, L Capriotti, A Carbone, G Carboni, R Cardinale, A Cardini, P Carniti, L Carus, A Casais Vidal, R Caspary, G Casse, M Cattaneo, G Cavallero, V Cavallini, S Celani, J Cerasoli, D Cervenkov, A J Chadwick, M G Chapman, M Charles, Ph Charpentier, C A Chavez Barajas, M Chefdeville, C Chen, S Chen, A Chernov, S Chernyshenko, V Chobanova, S Cholak, M Chrzaszcz, A Chubykin, V Chulikov, P Ciambrone, M F Cicala, X Cid Vidal, G Ciezarek, G Ciullo, P E L Clarke, M Clemencic, H V Cliff, J Closier, J L Cobbledick, V Coco, J A B Coelho, J Cogan, E Cogneras, L Cojocariu, P Collins, T Colombo, L Congedo, A Contu, N Cooke, I Corredoira, G Corti, B Couturier, D C Craik, M Cruz Torres, R Currie, C L Da Silva, S Dadabaev, L Dai, X Dai, E Dall'Occo, J Dalseno, C D'Ambrosio, J Daniel, A Danilina, P d'Argent, J E Davies, A Davis, O De Aguiar Francisco, J de Boer, K De Bruyn, S De Capua, M De Cian, U De Freitas Carneiro Da Graca, E De Lucia, J M De Miranda, L De Paula, M De Serio, D De Simone, P De Simone, F De Vellis, J A de Vries, C T Dean, F Debernardis, D Decamp, V Dedu, L Del Buono, B Delaney, H-P Dembinski, V Denysenko, O Deschamps, F Dettori, B Dey, P Di Nezza, I Diachkov, S Didenko, L Dieste Maronas, S Ding, V Dobishuk, A Dolmatov, C Dong, A M Donohoe, F Dordei, A C Dos Reis, L Douglas, A G Downes, P Duda, M W Dudek, L Dufour, V Duk, P Durante, M M Duras, J M Durham, D Dutta, A Dziurda, A Dzyuba, S Easo, U Egede, V Egorychev, S Eidelman, C Eirea Orro, S Eisenhardt, E Ejopu, S Ek-In, L Eklund, S Ely, A Ene, E Epple, S Escher, J Eschle, S Esen, T Evans, F Fabiano, L N Falcao, Y Fan, B Fang, L Fantini, M Faria, S Farry, D Fazzini, L F Felkowski, M Feo, M Fernandez Gomez, A D Fernez, F Ferrari, L Ferreira Lopes, F Ferreira Rodrigues, S Ferreres Sole, M Ferrillo, M Ferro-Luzzi, S Filippov, R A Fini, M Fiorini, M Firlej, K M Fischer, D S Fitzgerald, C Fitzpatrick, T Fiutowski, F Fleuret, M Fontana, F Fontanelli, R Forty, D Foulds-Holt, V Franco Lima, M Franco Sevilla, M Frank, E Franzoso, G Frau, C Frei, D A Friday, J Fu, Q Fuehring, T Fulghesu, E Gabriel, G Galati, M D Galati, A Gallas Torreira, D Galli, S Gambetta, Y Gan, M Gandelman, P Gandini, Y Gao, Y Gao, M Garau, L M Garcia Martin, P Garcia Moreno, J García Pardiñas, B Garcia Plana, F A Garcia Rosales, L Garrido, C Gaspar, R E Geertsema, D Gerick, L L Gerken, E Gersabeck, M Gersabeck, T Gershon, L Giambastiani, V Gibson, H K Giemza, A L Gilman, M Giovannetti, A Gioventù, P Gironella Gironell, C Giugliano, M A Giza, K Gizdov, E L Gkougkousis, V V Gligorov, C Göbel, E Golobardes, D Golubkov, A Golutvin, A Gomes, S Gomez Fernandez, F Goncalves Abrantes, M Goncerz, G Gong, I V Gorelov, C Gotti, J P Grabowski, T Grammatico, L A Granado Cardoso, E Graugés, E Graverini, G Graziani, A T Grecu, L M Greeven, N A Grieser, L Grillo, S Gromov, B R Gruberg Cazon, C Gu, M Guarise, M Guittiere, P A Günther, E Gushchin, A Guth, Y Guz, T Gys, T Hadavizadeh, C Hadjivasiliou, G Haefeli, C Haen, J Haimberger, S C Haines, T Halewood-Leagas, M M Halvorsen, P M Hamilton, J Hammerich, Q Han, X Han, E B Hansen, S Hansmann-Menzemer, L Hao, N Harnew, T Harrison, C Hasse, M Hatch, J He, K Heijhoff, C Henderson, R D L Henderson, A M Hennequin, K Hennessy, L Henry, J Herd, J Heuel, A Hicheur, D Hill, M Hilton, S E Hollitt, J Horswill, R Hou, Y Hou, J Hu, J Hu, W Hu, X Hu, W Huang, X Huang, W Hulsbergen, R J Hunter, M Hushchyn, D Hutchcroft, P Ibis, M Idzik, D Ilin, P Ilten, A Inglessi, A Iniukhin, A Ishteev, K Ivshin, R Jacobsson, H Jage, S J Jaimes Elles, S Jakobsen, E Jans, B K Jashal, A Jawahery, V Jevtic, E Jiang, X Jiang, Y Jiang, M John, D Johnson, C R Jones, T P Jones, B Jost, N Jurik, I Juszczak, S Kandybei, Y Kang, M Karacson, D Karpenkov, M Karpov, J W Kautz, F Keizer, D M Keller, M Kenzie, T Ketel, B Khanji, A Kharisova, S Kholodenko, G Khreich, T Kirn, V S Kirsebom, O Kitouni, S Klaver, N Kleijne, K Klimaszewski, M R Kmiec, S Koliiev, A Kondybayeva, A Konoplyannikov, P Kopciewicz, R Kopecna, P Koppenburg, M Korolev, I Kostiuk, O Kot, S Kotriakhova, A Kozachuk, P Kravchenko, L Kravchuk, R D Krawczyk, M Kreps, S Kretzschmar, P Krokovny, W Krupa, W Krzemien, J Kubat, S Kubis, W Kucewicz, M Kucharczyk, V Kudryavtsev, A Kupsc, D Lacarrere, G Lafferty, A Lai, A Lampis, D Lancierini, C Landesa Gomez, J J Lane, R Lane, G Lanfranchi, C Langenbruch, J Langer, O Lantwin, T Latham, F Lazzari, M Lazzaroni, R Le Gac, S H Lee, R Lefèvre, A Leflat, S Legotin, P Lenisa, O Leroy, T Lesiak, B Leverington, A Li, H Li, K Li, P Li, P-R Li, S Li, T Li, T Li, Y Li, Z Li, X Liang, C Lin, T Lin, R Lindner, V Lisovskyi, R Litvinov, G Liu, H Liu, Q Liu, S Liu, A Lobo Salvia, A Loi, R Lollini, J Lomba Castro, I Longstaff, J H Lopes, A Lopez Huertas, S López Soliño, G H Lovell, Y Lu, C Lucarelli, D Lucchesi, S Luchuk, M Lucio Martinez, V Lukashenko, Y Luo, A Lupato, E Luppi, A Lusiani, K Lynch, X-R Lyu, L Ma, R Ma, S Maccolini, F Machefert, F Maciuc, I Mackay, V Macko, P Mackowiak, L R Madhan Mohan, A Maevskiy, D Maisuzenko, M W Majewski, J J Malczewski, S Malde, B Malecki, A Malinin, T Maltsev, G Manca, G Mancinelli, C Mancuso, D Manuzzi, C A Manzari, D Marangotto, J F Marchand, U Marconi, S Mariani, C Marin Benito, J Marks, A M Marshall, P J Marshall, G Martelli, G Martellotti, L Martinazzoli, M Martinelli, D Martinez Santos, F Martinez Vidal, A Massafferri, M Materok, R Matev, A Mathad, V Matiunin, C Matteuzzi, K R Mattioli, A Mauri, E Maurice, J Mauricio, M Mazurek, M McCann, L Mcconnell, T H McGrath, N T McHugh, A McNab, R McNulty, J V Mead, B Meadows, G Meier, D Melnychuk, S Meloni, M Merk, A Merli, L Meyer Garcia, D Miao, M Mikhasenko, D A Milanes, E Millard, M Milovanovic, M-N Minard, A Minotti, T Miralles, S E Mitchell, B Mitreska, D S Mitzel, A Mödden, R A Mohammed, R D Moise, S Mokhnenko, T Mombächer, M Monk, I A Monroy, S Monteil, M Morandin, G Morello, M J Morello, J Moron, A B Morris, A G Morris, R Mountain, H Mu, E Muhammad, F Muheim, M Mulder, K Müller, C H Murphy, D Murray, R Murta, P Muzzetto, P Naik, T Nakada, R Nandakumar, T Nanut, I Nasteva, M Needham, N Neri, S Neubert, N Neufeld, P Neustroev, R Newcombe, J Nicolini, E M Niel, S Nieswand, N Nikitin, N S Nolte, C Normand, J Novoa Fernandez, C Nunez, A Oblakowska-Mucha, V Obraztsov, T Oeser, D P O'Hanlon, S Okamura, R Oldeman, F Oliva, C J G Onderwater, R H O'Neil, J M Otalora Goicochea, T Ovsiannikova, P Owen, A Oyanguren, O Ozcelik, K O Padeken, B Pagare, P R Pais, T Pajero, A Palano, M Palutan, Y Pan, G Panshin, L Paolucci, A Papanestis, M Pappagallo, L L Pappalardo, C Pappenheimer, W Parker, C Parkes, B Passalacqua, G Passaleva, A Pastore, M Patel, C Patrignani, C J Pawley, A Pearce, A Pellegrino, M Pepe Altarelli, S Perazzini, D Pereima, A Pereiro Castro, P Perret, M Petric, K Petridis, A Petrolini, A Petrov, S Petrucci, M Petruzzo, H Pham, A Philippov, R Piandani, L Pica, M Piccini, B Pietrzyk, G Pietrzyk, M Pili, A Pilloni, D Pinci, F Pisani, M Pizzichemi, V Placinta, J Plews, M Plo Casasus, F Polci, M Poli Lener, M Poliakova, A Poluektov, N Polukhina, I Polyakov, E Polycarpo, S Ponce, D Popov, S Popov, S Poslavskii, K Prasanth, L Promberger, C Prouve, V Pugatch, V Puill, G Punzi, H R Qi, W Qian, N Qin, S Qu, R Quagliani, N V Raab, R I Rabadan Trejo, B Rachwal, J H Rademacker, R Rajagopalan, M Rama, M Ramos Pernas, M S Rangel, F Ratnikov, G Raven, M Rebollo De Miguel, F Redi, J Reich, F Reiss, C Remon Alepuz, Z Ren, P K Resmi, R Ribatti, A M Ricci, S Ricciardi, K Richardson, M Richardson-Slipper, K Rinnert, P Robbe, G Robertson, A B Rodrigues, E Rodrigues, E Rodriguez Fernandez, J A Rodriguez Lopez, E Rodriguez Rodriguez, D L Rolf, A Rollings, P Roloff, V Romanovskiy, M Romero Lamas, A Romero Vidal, J D Roth, M Rotondo, M S Rudolph, T Ruf, R A Ruiz Fernandez, J Ruiz Vidal, A Ryzhikov, J Ryzka, J J Saborido Silva, N Sagidova, N Sahoo, B Saitta, M Salomoni, C Sanchez Gras, I Sanderswood, R Santacesaria, C Santamarina Rios, M Santimaria, E Santovetti, D Saranin, G Sarpis, M Sarpis, A Sarti, C Satriano, A Satta, M Saur, D Savrina, H Sazak, L G Scantlebury Smead, A Scarabotto, S Schael, S Scherl, M Schiller, H Schindler, M Schmelling, B Schmidt, S Schmitt, O Schneider, A Schopper, M Schubiger, S Schulte, M H Schune, R Schwemmer, B Sciascia, A Sciuccati, S Sellam, A 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Tonani, X Tong, D Torres Machado, D Y Tou, S M Trilov, C Trippl, G Tuci, A Tully, N Tuning, A Ukleja, D J Unverzagt, A Usachov, A Ustyuzhanin, U Uwer, A Vagner, V Vagnoni, A Valassi, G Valenti, N Valls Canudas, M van Beuzekom, M Van Dijk, H Van Hecke, E van Herwijnen, C B Van Hulse, M van Veghel, R Vazquez Gomez, P Vazquez Regueiro, C Vázquez Sierra, S Vecchi, J J Velthuis, M Veltri, A Venkateswaran, M Veronesi, M Vesterinen, D Vieira, M Vieites Diaz, X Vilasis-Cardona, E Vilella Figueras, A Villa, P Vincent, F C Volle, D Vom Bruch, A Vorobyev, V Vorobyev, N Voropaev, K Vos, C Vrahas, R Waldi, J Walsh, G Wan, C Wang, G Wang, J Wang, J Wang, J Wang, J Wang, M Wang, R Wang, X Wang, Y Wang, Z Wang, Z Wang, Z Wang, J A Ward, N K Watson, D Websdale, Y Wei, C Weisser, B D C Westhenry, D J White, M Whitehead, A R Wiederhold, D Wiedner, G Wilkinson, M K Wilkinson, I Williams, M Williams, M R J Williams, R Williams, F F Wilson, W Wislicki, M Witek, L Witola, C P Wong, G Wormser, S A Wotton, H Wu, J Wu, K Wyllie, Z Xiang, D Xiao, Y Xie, A Xu, J Xu, L Xu, L Xu, M Xu, Q Xu, Z Xu, Z Xu, D Yang, S Yang, X Yang, Y Yang, Z Yang, Z Yang, L E Yeomans, V Yeroshenko, H Yeung, H Yin, J Yu, X Yuan, E Zaffaroni, M Zavertyaev, M Zdybal, O Zenaiev, M Zeng, C Zhang, D Zhang, L Zhang, S Zhang, S Zhang, Y Zhang, Y Zhang, A Zharkova, A Zhelezov, Y Zheng, T Zhou, X Zhou, Y Zhou, V Zhovkovska, X Zhu, X Zhu, Z Zhu, V Zhukov, Q Zou, S Zucchelli, D Zuliani, G ZunicaPhysical Review Letters 2023 July 22
An amplitude analysis of B^{-}→J/ψΛp[over ¯] decays is performed using 4400 signal candidates selected on a data sample of pp collisions recorded at center-of-mass energies of 7, 8, and 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 9 fb^{-1}. A narrow resonance in the J/ψΛ system, consistent with a pentaquark candidate with strangeness, is observed with high significance. The mass and the width of this new state are measured to be 4338.2±0.7±0.4 MeV and 7.0±1.2±1.3 MeV, where the first uncertainty is statistical and the second systematic. The spin is determined to be 1/2 and negative parity is preferred. Because of the small Q-value of the reaction, the most precise single measurement of the B^{-} mass to date, 5279.44±0.05±0.07 MeV, is obtained.
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