Observation of Two New Excited Ξ_{b}^{0} States Decaying to Λ_{b}^{0}K^{-}π^{+}.
R Aaij, A S W Abdelmotteleb, C Abellán Beteta, T Ackernley, B Adeva, M Adinolfi, H Afsharnia, C Agapopoulou, C A Aidala, S Aiola, Z Ajaltouni, S Akar, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, Z Aliouche, G Alkhazov, P Alvarez Cartelle, S Amato, J L Amey, Y Amhis, L An, L Anderlini, A Andreianov, M Andreotti, F Archilli, A Artamonov, M Artuso, K Arzymatov, E Aslanides, M Atzeni, B Audurier, S Bachmann, M Bachmayer, J J Back, P Baladron Rodriguez, V Balagura, W Baldini, J Baptista Leite, M Barbetti, R J Barlow, S Barsuk, W Barter, M Bartolini, F Baryshnikov, J M Basels, S Bashir, G Bassi, B Batsukh, A Battig, A Bay, A Beck, M Becker, F Bedeschi, I Bediaga, A Beiter, V Belavin, S Belin, V Bellee, K Belous, I Belov, I Belyaev, G Bencivenni, E Ben-Haim, A Berezhnoy, R Bernet, D Berninghoff, H C Bernstein, C Bertella, A Bertolin, C Betancourt, F Betti, Ia Bezshyiko,S Bhasin, J Bhom, L Bian, M S Bieker, S Bifani, P Billoir, M Birch, F C R Bishop, A Bitadze, A Bizzeti, M Bjørn, M P Blago, T Blake, F Blanc, S Blusk, D Bobulska, J A Boelhauve, O Boente Garcia, T Boettcher, A Boldyrev, A Bondar, N Bondar, S Borghi, M Borisyak, M Borsato, J T Borsuk, S A Bouchiba, T J V Bowcock, A Boyer, C Bozzi, M J Bradley, S Braun, A Brea Rodriguez, M Brodski, J Brodzicka, A Brossa Gonzalo,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, L Calero Diaz, S Cali, R Calladine, M Calvi, M Calvo Gomez, P Camargo Magalhaes,P Campana, A F Campoverde Quezada, S Capelli, L Capriotti, A Carbone, G Carboni, R Cardinale, A Cardini, I Carli, P Carniti, L Carus, K Carvalho Akiba, A Casais Vidal, G Casse, M Cattaneo, G Cavallero, S Celani, J Cerasoli, D Cervenkov, A J Chadwick, M G Chapman, M Charles, Ph Charpentier, G Chatzikonstantinidis, C A Chavez Barajas, M Chefdeville, C Chen, S Chen, A Chernov, V Chobanova, S Cholak, M Chrzaszcz, A Chubykin, V Chulikov, P Ciambrone, M F Cicala, X Cid Vidal, G Ciezarek, 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, G Coombs, I Corredoira, G Corti, C M Costa Sobral, B Couturier, D C Craik, J Crkovská, M Cruz Torres, R Currie, C L Da Silva, S Dadabaev, L Dai, E Dall'Occo, J Dalseno, C D'Ambrosio, A Danilina, P d'Argent, J E Davies, A Davis, O De Aguiar Francisco, K De Bruyn, S De Capua, M De Cian, J M De Miranda, L De Paula, M De Serio, D De Simone, P De Simone, J A de Vries, C T Dean, D Decamp, V Dedu, L Del Buono, B Delaney, H-P Dembinski, A Dendek, V Denysenko, D Derkach, O Deschamps, F Desse, F Dettori, B Dey, A Di Cicco, P Di Nezza, S Didenko, L Dieste Maronas, H Dijkstra, V Dobishuk, C Dong, A M Donohoe, F Dordei, A C Dos Reis, L Douglas, A Dovbnya, A G Downes, M W Dudek, L Dufour, V Duk, P Durante, J M Durham, D Dutta, A Dziurda, A Dzyuba, S Easo, U Egede, V Egorychev, S Eidelman, S Eisenhardt, S Ek-In, L Eklund, S Ely, A Ene, E Epple, S Escher, J Eschle, S Esen, T Evans, A Falabella, J Fan, Y Fan, B Fang, S Farry, D Fazzini, M Féo, A Fernandez Prieto,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, A Fkiaras, 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, E Gabriel, A Gallas Torreira, D Galli, S Gambetta, Y Gan, M Gandelman, P Gandini, 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, D Gerstel, Ph Ghez, L Giambastiani, V Gibson, H K Giemza, A L Gilman, M Giovannetti, A Gioventù, P Gironella Gironell, L Giubega, C Giugliano, K Gizdov, E L Gkougkousis, V V Gligorov, 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R Jones, T P Jones, B Jost, N Jurik,S H Kalavan Kadavath, S Kandybei, Y Kang, M Karacson, M Karpov, F Keizer, D M Keller, M Kenzie, T Ketel, B Khanji, A Kharisova, S Kholodenko, 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, P Kravchenko, L Kravchuk, R D Krawczyk, M Kreps, F Kress, S Kretzschmar, P Krokovny, W Krupa, W Krzemien, W Kucewicz, M Kucharczyk, V Kudryavtsev, H S Kuindersma, G J Kunde, T Kvaratskheliya, D Lacarrere, G Lafferty, A Lai, A Lampis, D Lancierini, J J Lane, R Lane, G Lanfranchi, C Langenbruch, J Langer, O Lantwin, T Latham, F Lazzari, R Le Gac, S H Lee, R Lefèvre, A Leflat, S Legotin, O Leroy, T Lesiak, B Leverington, H Li, P Li, S Li, Y Li, Y Li, Z Li, X Liang, T Lin, R Lindner, V Lisovskyi, R Litvinov, G Liu, H Liu, Q Liu, S Liu, A Lobo Salvia, A Loi, J Lomba Castro, I Longstaff, J H Lopes, S Lopez 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PHYSICAL REVIEW LETTERS（2022）
引用 7|浏览73
摘要
Two narrow resonant states are observed in the Λ_{b}^{0}K^{-}π^{+} mass spectrum using a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of 6 fb^{-1}. The minimal quark content of the Λ_{b}^{0}K^{-}π^{+} system indicates that these are excited Ξ_{b}^{0} baryons. The masses of the Ξ_{b}(6327)^{0} and Ξ_{b}(6333)^{0} states are m[Ξ_{b}(6327)^{0}]=6327.28_{-0.21}^{+0.23}±0.12±0.24 and m[Ξ_{b}(6333)^{0}]=6332.69_{-0.18}^{+0.17}±0.03±0.22 MeV, respectively, with a mass splitting of Δm=5.41_{-0.27}^{+0.26}±0.12 MeV, where the uncertainties are statistical, systematic, and due to the Λ_{b}^{0} mass measurement. The measured natural widths of these states are consistent with zero, with upper limits of Γ[Ξ_{b}(6327)^{0}]<2.20(2.56) and Γ[Ξ_{b}(6333)^{0}]<1.60(1.92) MeV at a 90% (95%) credibility level. The significance of the two-peak hypothesis is larger than nine (five) Gaussian standard deviations compared to the no-peak (one-peak) hypothesis. The masses, widths, and resonant structure of the new states are in good agreement with the expectations for a doublet of 1D Ξ_{b}^{0} resonances.
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