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Phys Rev Lett. 2019 Jun 07;122(22):222001. doi: 10.1103/PhysRevLett.122.222001.

Observation of a Narrow Pentaquark State, P_{c}(4312)^{+}, and of the Two-Peak Structure of the P_{c}(4450)^{+}.

Physical review letters

R Aaij, C Abellán Beteta, B Adeva, M Adinolfi, C A Aidala, Z Ajaltouni, S Akar, P Albicocco, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, G Alkhazov, P Alvarez Cartelle, A A Alves, S Amato, Y Amhis, L An, L Anderlini, G Andreassi, M Andreotti, J E Andrews, F Archilli, P d'Argent, J Arnau Romeu, A Artamonov, M Artuso, K Arzymatov, E Aslanides, M Atzeni, B Audurier, S Bachmann, J J Back, S Baker, V Balagura, W Baldini, A Baranov, R J Barlow, S Barsuk, W Barter, M Bartolini, F Baryshnikov, V Batozskaya, B Batsukh, A Battig, V Battista, A Bay, F Bedeschi, I Bediaga, A Beiter, L J Bel, V Belavin, S Belin, 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, S Bhasin, J Bhom, M S Bieker, S Bifani, P Billoir, A Birnkraut, A Bizzeti, M Bjørn, M P Blago, 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, M Boubdir, T J V Bowcock, C Bozzi, S Braun, A Brea Rodriguez, M Brodski, J Brodzicka, A Brossa Gonzalo, D Brundu, E Buchanan, A Buonaura, C Burr, A Bursche, J S Butter, J Buytaert, W Byczynski, S Cadeddu, H Cai, R Calabrese, S Cali, 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, K Carvalho Akiba, A Casais Vidal, G Casse, M Cattaneo, G Cavallero, R Cenci, 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, F Cindolo, P E L Clarke, M Clemencic, H V Cliff, J Closier, V Coco, J A B Coelho, J Cogan, E Cogneras, L Cojocariu, P Collins, T Colombo, A Comerma-Montells, A Contu, G Coombs, S Coquereau, G Corti, C M Costa Sobral, B Couturier, G A Cowan, D C Craik, A Crocombe, M Cruz Torres, R Currie, C D'Ambrosio, 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, W Dean, D Decamp, L Del Buono, B Delaney, H-P Dembinski, M Demmer, A Dendek, D Derkach, O Deschamps, F Desse, 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, S Ek-In, R Ekelhof, L Eklund, S Ely, A Ene, S Escher, S Esen, T Evans, A Falabella, N Farley, S Farry, D Fazzini, P Fernandez Declara, A Fernandez Prieto, C Fernández-Ramírez, F Ferrari, L Ferreira Lopes, F Ferreira Rodrigues, S Ferreres Sole, 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 Franco Sevilla, M Frank, C Frei, J Fu, W Funk, C Färber, M Féo, E Gabriel, A Gallas Torreira, D Galli, S Gallorini, S Gambetta, Y Gan, 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, G Gazzoni, D Gerick, E Gersabeck, M Gersabeck, T Gershon, D Gerstel, Ph Ghez, V Gibson, O G Girard, P Gironella Gironell, 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, C Gu, X Guo, E Gushchin, A Guth, Yu Guz, T Gys, C Göbel, T Hadavizadeh, C Hadjivasiliou, G Haefeli, C Haen, S C Haines, B Hamilton, Q Han, X Han, T H Hancock, S Hansmann-Menzemer, N Harnew, T Harrison, C Hasse, M Hatch, J He, M Hecker, K Heinicke, A Heister, K Hennessy, L Henry, E van Herwijnen, J Heuel, M Heß, A Hicheur, R Hidalgo Charman, D Hill, M Hilton, P H Hopchev, J Hu, W Hu, W Huang, Z C Huard, W Hulsbergen, T Humair, M Hushchyn, D Hutchcroft, D Hynds, P Ibis, M Idzik, P Ilten, A Inglessi, A Inyakin, K Ivshin, R Jacobsson, S Jakobsen, J Jalocha, E Jans, B K Jashal, 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, B Khanji, A Kharisova, C Khurewathanakul, K E Kim, T Kirn, V S Kirsebom, S Klaver, K Klimaszewski, S Koliiev, M Kolpin, A Kondybayeva, A Konoplyannikov, R Kopecna, P Koppenburg, I Kostiuk, O Kot, S Kotriakhova, M Kozeiha, L Kravchuk, M Kreps, F Kress, S Kretzschmar, P Krokovny, W Krupa, W Krzemien, W Kucewicz, M Kucharczyk, V Kudryavtsev, G J Kunde, 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, R Lefèvre, F Lemaitre, O Leroy, T Lesiak, B Leverington, H Li, 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Playfer, J Plews, M Plo Casasus, F Polci, M Poli Lener, M Poliakova, A Poluektov, N Polukhina, I Polyakov, E Polycarpo, G J Pomery, S Ponce, A Popov, D Popov, S Poslavskii, E Price, C Prouve, V Pugatch, A Puig Navarro, H Pullen, G Punzi, W Qian, J Qin, R Quagliani, B Quintana, N V Raab, 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, M Roehrken, S Roiser, A Rollings, V Romanovskiy, A Romero Vidal, J D Roth, 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, S Schulte, M H Schune, R Schwemmer, B Sciascia, A Sciubba, A Semennikov, E S Sepulveda, A Sergi, N Serra, J Serrano, L Sestini, A Seuthe, P Seyfert, M Shapkin, T Shears, L Shekhtman, V Shevchenko, E Shmanin, B G Siddi, R Silva Coutinho, L Silva de Oliveira, G Simi, S Simone, I Skiba, N Skidmore, T Skwarnicki, M W Slater, J G Smeaton, 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, E Spadaro Norella, P Spradlin, F Stagni, M Stahl, S Stahl, P Stefko, S Stefkova, O Steinkamp, S Stemmle, O Stenyakin, M Stepanova, H Stevens, A Stocchi, S Stone, S Stracka, M E Stramaglia, M Straticiuc, U Straumann, S Strokov, J Sun, L Sun, Y Sun, K Swientek, A Szabelski, A Szczepaniak, T Szumlak, M Szymanski, S T'Jampens, Z Tang, 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 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Affiliations

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

PMID: 31283265 DOI: 10.1103/PhysRevLett.122.222001

Abstract

A narrow pentaquark state, P_{c}(4312)^{+}, decaying to J/ψp, is discovered with a statistical significance of 7.3σ in a data sample of Λ_{b}^{0}→J/ψpK^{-} decays, which is an order of magnitude larger than that previously analyzed by the LHCb Collaboration. The P_{c}(4450)^{+} pentaquark structure formerly reported by LHCb is confirmed and observed to consist of two narrow overlapping peaks, P_{c}(4440)^{+} and P_{c}(4457)^{+}, where the statistical significance of this two-peak interpretation is 5.4σ. The proximity of the Σ_{c}^{+}D[over ¯]^{0} and Σ_{c}^{+}D[over ¯]^{*0} thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states.

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