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Phys Rev Lett. 2018 Aug 17;121(7):072002. doi: 10.1103/PhysRevLett.121.072002.

Observation of a New Ξ_{b}^{-} Resonance.

Physical review letters

R Aaij, B Adeva, M Adinolfi, C A Aidala, Z Ajaltouni, S Akar, P Albicocco, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, S Ali, G Alkhazov, P Alvarez Cartelle, A A Alves, S Amato, S Amerio, Y Amhis, L An, L Anderlini, G Andreassi, M Andreotti, J E Andrews, R B Appleby, F Archilli, P d'Argent, J Arnau Romeu, A Artamonov, M Artuso, K Arzymatov, E Aslanides, M Atzeni, S Bachmann, J J Back, S Baker, V Balagura, W Baldini, A Baranov, R J Barlow, S Barsuk, W Barter, F Baryshnikov, V Batozskaya, B Batsukh, V Battista, A Bay, J Beddow, F Bedeschi, I Bediaga, A Beiter, L J Bel, N Beliy, V Bellee, N Belloli, K Belous, I Belyaev, E Ben-Haim, G Bencivenni, S Benson, S Beranek, A Berezhnoy, R Bernet, D Berninghoff, E Bertholet, A Bertolin, C Betancourt, F Betti, M O Bettler, M van Beuzekom, Ia Bezshyiko, L Bian, S Bifani, P Billoir, A Birnkraut, A Bizzeti, M Bjørn, T Blake, F Blanc, S Blusk, D Bobulska, V Bocci, O Boente Garcia, T Boettcher, A Bondar, N Bondar, S Borghi, M Borisyak, M Borsato, F Bossu, M Boubdir, T J V Bowcock, C Bozzi, S Braun, M Brodski, J Brodzicka, D Brundu, E Buchanan, A Buonaura, C Burr, A Bursche, J Buytaert, W Byczynski, S Cadeddu, H Cai, R Calabrese, R Calladine, M Calvi, M Calvo Gomez, A Camboni, P Campana, D H Campora Perez, L Capriotti, A Carbone, G Carboni, R Cardinale, A Cardini, P Carniti, L Carson, K Carvalho Akiba, G Casse, L Cassina, M Cattaneo, G Cavallero, R Cenci, D Chamont, M G Chapman, M Charles, Ph Charpentier, G Chatzikonstantinidis, M Chefdeville, V Chekalina, C Chen, S Chen, S-G Chitic, V Chobanova, M Chrzaszcz, A Chubykin, P Ciambrone, X Cid Vidal, G Ciezarek, P E L Clarke, M Clemencic, H V Cliff, J Closier, V Coco, J Cogan, E Cogneras, L Cojocariu, P Collins, T Colombo, A Comerma-Montells, A Contu, G Coombs, S Coquereau, G Corti, M Corvo, C M Costa Sobral, B Couturier, G A Cowan, D C Craik, A Crocombe, M Cruz Torres, R Currie, C D'Ambrosio, F Da Cunha Marinho, C L Da Silva, E Dall'Occo, J Dalseno, A Danilina, 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, P De Simone, C T Dean, D Decamp, L Del Buono, B Delaney, H-P Dembinski, M Demmer, A Dendek, D Derkach, O Deschamps, F Dettori, B Dey, A Di Canto, P Di Nezza, S Didenko, H Dijkstra, F Dordei, M Dorigo, A Dosil Suárez, L Douglas, A Dovbnya, K Dreimanis, L Dufour, G Dujany, P Durante, J M Durham, D Dutta, R Dzhelyadin, M Dziewiecki, A Dziurda, A Dzyuba, S Easo, U Egede, V Egorychev, S Eidelman, S Eisenhardt, U Eitschberger, R Ekelhof, L Eklund, S Ely, A Ene, S Escher, S Esen, H M Evans, T Evans, A Falabella, N Farley, S Farry, D Fazzini, L Federici, G Fernandez, P Fernandez Declara, A Fernandez Prieto, F Ferrari, L Ferreira Lopes, F Ferreira Rodrigues, M Ferro-Luzzi, S Filippov, R A Fini, M Fiorini, M Firlej, C Fitzpatrick, T Fiutowski, F Fleuret, M Fontana, F Fontanelli, R Forty, V Franco Lima, M Frank, C Frei, J Fu, W Funk, C Färber, M Féo Pereira Rivello Carvalho, E Gabriel, A Gallas Torreira, D Galli, S Gallorini, S Gambetta, M Gandelman, P Gandini, Y Gao, L M Garcia Martin, B Garcia Plana, J García Pardiñas, J Garra Tico, L Garrido, D Gascon, C Gaspar, L Gavardi, G Gazzoni, D Gerick, E Gersabeck, M Gersabeck, T Gershon, Ph Ghez, S Gianì, V Gibson, O G Girard, L Giubega, K Gizdov, V V Gligorov, D Golubkov, A Golutvin, A Gomes, I V Gorelov, C Gotti, E Govorkova, J P Grabowski, R Graciani Diaz, L A Granado Cardoso, E Graugés, E Graverini, G Graziani, A Grecu, R Greim, P Griffith, L Grillo, L Gruber, B R Gruberg Cazon, O Grünberg, C Gu, E Gushchin, Yu Guz, T Gys, C Göbel, T Hadavizadeh, C Hadjivasiliou, G Haefeli, C Haen, S C Haines, B Hamilton, X Han, T H Hancock, S Hansmann-Menzemer, N Harnew, S T Harnew, C Hasse, M Hatch, J He, M Hecker, K Heinicke, A Heister, K Hennessy, L Henry, E van Herwijnen, M Heß, A Hicheur, D Hill, M Hilton, P H Hopchev, W Hu, W Huang, Z C Huard, W Hulsbergen, T Humair, M Hushchyn, D Hutchcroft, P Ibis, M Idzik, P Ilten, K Ivshin, R Jacobsson, J Jalocha, E Jans, A Jawahery, F Jiang, M John, D Johnson, C R Jones, C Joram, B Jost, N Jurik, S Kandybei, M Karacson, J M Kariuki, S Karodia, N Kazeev, M Kecke, F Keizer, M Kelsey, M Kenzie, T Ketel, E Khairullin, B Khanji, C Khurewathanakul, K E Kim, T Kirn, S Klaver, K Klimaszewski, T Klimkovich, S Koliiev, M Kolpin, R Kopecna, P Koppenburg, S Kotriakhova, M Kozeiha, L Kravchuk, M Kreps, F Kress, P Krokovny, W Krupa, W Krzemien, W Kucewicz, M Kucharczyk, V Kudryavtsev, A K Kuonen, T Kvaratskheliya, D Lacarrere, G Lafferty, A Lai, D Lancierini, G Lanfranchi, C Langenbruch, T Latham, C Lazzeroni, R Le Gac, A Leflat, J Lefrançois, R Lefèvre, F Lemaitre, O Leroy, T Lesiak, B Leverington, P-R Li, T Li, Z Li, X Liang, T Likhomanenko, R Lindner, F Lionetto, V Lisovskyi, X Liu, D Loh, A Loi, I Longstaff, J H Lopes, D Lucchesi, M Lucio Martinez, A Lupato, E Luppi, O Lupton, A Lusiani, X Lyu, F Machefert, F Maciuc, V Macko, P Mackowiak, S Maddrell-Mander, O Maev, K Maguire, D Maisuzenko, M W Majewski, S Malde, B Malecki, A Malinin, T Maltsev, G Manca, G Mancinelli, D Marangotto, J Maratas, J F Marchand, U Marconi, C Marin Benito, M Marinangeli, P Marino, J Marks, G Martellotti, M Martin, M Martinelli, D Martinez Santos, F Martinez Vidal, A Massafferri, R Matev, A Mathad, Z Mathe, C Matteuzzi, A Mauri, E Maurice, B Maurin, A Mazurov, M McCann, A McNab, R McNulty, J V Mead, B Meadows, C Meaux, F Meier, N Meinert, D Melnychuk, M Merk, A Merli, E Michielin, D A Milanes, E Millard, M-N Minard, L Minzoni, D S Mitzel, A Mogini, J Molina Rodriguez, T Mombächer, I A Monroy, S Monteil, M Morandin, G Morello, M J Morello, O Morgunova, J Moron, A B Morris, R Mountain, F Muheim, M Mulder, D Müller, J Müller, K Müller, V Müller, P Naik, T Nakada, R Nandakumar, A Nandi, T Nanut, I Nasteva, M Needham, N Neri, S Neubert, N Neufeld, M Neuner, T D Nguyen, C Nguyen-Mau, S Nieswand, R Niet, N Nikitin, A Nogay, D P O'Hanlon, A Oblakowska-Mucha, V Obraztsov, S Ogilvy, R Oldeman, C J G Onderwater, A Ossowska, J M Otalora Goicochea, P Owen, A Oyanguren, P R Pais, A Palano, M Palutan, G Panshin, A Papanestis, M Pappagallo, L L Pappalardo, W Parker, C Parkes, G Passaleva, A Pastore, M Patel, C Patrignani, A Pearce, A Pellegrino, G Penso, M Pepe Altarelli, S Perazzini, D Pereima, P Perret, L Pescatore, K Petridis, A Petrolini, A Petrov, M Petruzzo, B Pietrzyk, G Pietrzyk, M Pikies, D Pinci, J Pinzino, F Pisani, A Pistone, A Piucci, V Placinta, S Playfer, J Plews, M Plo Casasus, F Polci, M Poli Lener, A Poluektov, N Polukhina, I Polyakov, E Polycarpo, G J Pomery, S Ponce, A Popov, D Popov, S Poslavskii, C Potterat, E Price, J Prisciandaro, C Prouve, V Pugatch, A Puig Navarro, H Pullen, G Punzi, W Qian, J Qin, R Quagliani, B Quintana, B Rachwal, J H Rademacker, M Rama, M Ramos Pernas, M S Rangel, F Ratnikov, G Raven, M Ravonel Salzgeber, M Reboud, F Redi, S Reichert, A C Dos Reis, F Reiss, C Remon Alepuz, Z Ren, V Renaudin, S Ricciardi, S Richards, K Rinnert, P Robbe, A Robert, A B Rodrigues, E Rodrigues, J A Rodriguez Lopez, A Rogozhnikov, S Roiser, A Rollings, V Romanovskiy, A Romero Vidal, M Rotondo, M S Rudolph, T Ruf, J Ruiz Vidal, J J Saborido Silva, N Sagidova, B Saitta, V Salustino Guimaraes, C Sanchez Gras, C Sanchez Mayordomo, B Sanmartin Sedes, R Santacesaria, C Santamarina Rios, M Santimaria, E Santovetti, G Sarpis, A Sarti, C Satriano, A Satta, M Saur, D Savrina, S Schael, M Schellenberg, M Schiller, H Schindler, M Schmelling, T Schmelzer, B Schmidt, O Schneider, A Schopper, H F Schreiner, M Schubiger, M H Schune, R Schwemmer, B Sciascia, A Sciubba, A Semennikov, E S Sepulveda, A Sergi, N Serra, J Serrano, L Sestini, P Seyfert, M Shapkin, Y Shcheglov, T Shears, L Shekhtman, V Shevchenko, E Shmanin, B G Siddi, R Silva Coutinho, L Silva de Oliveira, G Simi, S Simone, N Skidmore, T Skwarnicki, E Smith, I T Smith, M Smith, M Soares, L Soares Lavra, M D Sokoloff, F J P Soler, B Souza De Paula, B Spaan, P Spradlin, F Stagni, M Stahl, S Stahl, P Stefko, S Stefkova, O Steinkamp, S Stemmle, O Stenyakin, M Stepanova, H Stevens, S Stone, B Storaci, S Stracka, M E Stramaglia, M Straticiuc, U Straumann, S Strokov, J Sun, L Sun, K Swientek, V Syropoulos, T Szumlak, M Szymanski, S T'Jampens, Z Tang, A Tayduganov, T Tekampe, G Tellarini, F Teubert, E Thomas, J van Tilburg, M J Tilley, V Tisserand, M Tobin, S Tolk, L Tomassetti, D Tonelli, D Y Tou, R Tourinho Jadallah Aoude, E Tournefier, M Traill, M T Tran, A Trisovic, A Tsaregorodtsev, A Tully, N Tuning, A Ukleja, A Usachov, A Ustyuzhanin, U Uwer, C Vacca, A Vagner, V Vagnoni, A Valassi, S Valat, G Valenti, R Vazquez Gomez, P Vazquez Regueiro, S Vecchi, M van Veghel, J J Velthuis, M Veltri, G Veneziano, A Venkateswaran, T A Verlage, M Vernet, M Vesterinen, J V Viana Barbosa, D Vieira, M Vieites Diaz, H Viemann, X Vilasis-Cardona, A Vitkovskiy, M Vitti, V Volkov, A Vollhardt, B Voneki, A Vorobyev, V Vorobyev, C Voß, J A de Vries, C Vázquez Sierra, R Waldi, J Walsh, J Wang, M Wang, Y Wang, Z Wang, D R Ward, H M Wark, N K Watson, D Websdale, A Weiden, C Weisser, M Whitehead, J Wicht, G Wilkinson, M Wilkinson, M R J Williams, M Williams, T Williams, F F Wilson, J Wimberley, M Winn, J Wishahi, W Wislicki, M Witek, G Wormser, S A Wotton, K Wyllie, D Xiao, Y Xie, A Xu, M Xu, Q Xu, Z Xu, Z Xu, Z Yang, Z Yang, Y Yao, H Yin, J Yu, X Yuan, O Yushchenko, K A Zarebski, M Zavertyaev, D Zhang, L Zhang, W C Zhang, Y Zhang, A Zhelezov, Y Zheng, X Zhu, V Zhukov, J B Zonneveld, S Zucchelli,

Affiliations

  1. Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
  2. Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain.
  3. H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom.
  4. University of Michigan, Ann Arbor, Michigan, USA (associated with Syracuse University, Syracuse, New York, USA).
  5. Clermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
  6. University of Cincinnati, Cincinnati, Ohio, USA.
  7. INFN Laboratori Nazionali di Frascati, Frascati, Italy.
  8. Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
  9. European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  10. School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
  11. ICCUB, Universitat de Barcelona, Barcelona, Spain.
  12. Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia.
  13. Imperial College London, London, United Kingdom.
  14. Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
  15. INFN Sezione di Padova, Padova, Italy.
  16. LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France.
  17. Center for High Energy Physics, Tsinghua University, Beijing, China.
  18. INFN Sezione di Firenze, Firenze, Italy.
  19. Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
  20. INFN Sezione di Ferrara, Ferrara, Italy.
  21. University of Maryland, College Park, Maryland, USA.
  22. School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
  23. Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
  24. Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France.
  25. Institute for High Energy Physics (IHEP), Protvino, Russia.
  26. Syracuse University, Syracuse, New York, USA.
  27. Yandex School of Data Analysis, Moscow, Russia.
  28. Physik-Institut, Universität Zürich, Zürich, Switzerland.
  29. Department of Physics, University of Warwick, Coventry, United Kingdom.
  30. Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia.
  31. National Center for Nuclear Research (NCBJ), Warsaw, Poland.
  32. INFN Sezione di Pisa, Pisa, Italy.
  33. Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
  34. University of Chinese Academy of Sciences, Beijing, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China).
  35. INFN Sezione di Milano-Bicocca, Milano, Italy.
  36. LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France.
  37. I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany.
  38. Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
  39. INFN Sezione di Bologna, Bologna, Italy.
  40. Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
  41. School of Physics and Technology, Wuhan University, Wuhan, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China).
  42. University of Birmingham, Birmingham, United Kingdom.
  43. Department of Physics, University of Oxford, Oxford, United Kingdom.
  44. INFN Sezione di Roma La Sapienza, Roma, Italy.
  45. Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
  46. Budker Institute of Nuclear Physics (SB RAS), Novosibirsk, Russia.
  47. Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom.
  48. Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
  49. INFN Sezione di Cagliari, Monserrato, Italy.
  50. INFN Sezione di Roma Tor Vergata, Roma, Italy.
  51. INFN Sezione di Genova, Genova, Italy.
  52. School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
  53. Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France.
  54. Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
  55. Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA (associated with Syracuse University, Syracuse, New York, USA).
  56. INFN Sezione di Bari, Bari, Italy.
  57. Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
  58. AGH-University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland.
  59. Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China).
  60. National University of Science and Technology "MISIS", Moscow, Russia [associated with Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia].
  61. NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
  62. STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
  63. Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS), Moscow, Russia.
  64. INFN Sezione di Milano, Milano, Italy.
  65. Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia-CSIC, Valencia, Spain (associated with ICCUB, Universitat de Barcelona, Barcelona, Spain).
  66. Institut für Physik, Universität Rostock, Rostock, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
  67. Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil [associated with Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil].
  68. Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands.
  69. Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
  70. National Research Centre Kurchatov Institute, Moscow, Russia [associated with Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia].
  71. School of Physics, University College Dublin, Dublin, Ireland.
  72. Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France).
  73. Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).
  74. National Research Tomsk Polytechnic University, Tomsk, Russia [associated with Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia].

PMID: 30169090 DOI: 10.1103/PhysRevLett.121.072002

Abstract

From samples of pp collision data collected by the LHCb experiment at sqrt[s]=7, 8 and 13 TeV, corresponding to integrated luminosities of 1.0, 2.0 and 1.5  fb^{-1}, respectively, a peak in both the Λ_{b}^{0}K^{-} and Ξ_{b}^{0}π^{-} invariant mass spectra is observed. In the quark model, radially and orbitally excited Ξ_{b}^{-} resonances with quark content bds are expected. Referring to this peak as Ξ_{b}(6227)^{-}, the mass and natural width are measured to be m_{Ξ_{b}(6227)^{-}}=6226.9±2.0±0.3±0.2  MeV/c^{2} and Γ_{Ξ_{b}(6227)^{-}}=18.1±5.4±1.8  MeV/c^{2}, where the first uncertainty is statistical, the second is systematic, and the third, on m_{Ξ_{b}(6227)^{-}}, is due to the knowledge of the Λ_{b}^{0} baryon mass. Relative production rates of the Ξ_{b}(6227)^{-}→Λ_{b}^{0}K^{-} and Ξ_{b}(6227)^{-}→Ξ_{b}^{0}π^{-} decays are also reported.

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