Letter
Open Access

Observation of excited $Ω_{c}^{0}$ baryons in $Ω_{b}^{-} \to Ξ_{c}^{+} K^{-} π^{-}$ decays

R. Aaij³², C. Abellán Beteta⁵⁰, T. Ackernley⁶⁰, B. Adeva⁴⁶, M. Adinolfi⁵⁴, H. Afsharnia⁹, C. A. Aidala⁸⁶, S. Aiola²⁵, Z. Ajaltouni⁹ et al. (LHCb Collaboration)

Z. Ajaltouni⁹, S. Akar⁶⁵, J. Albrecht¹⁵, F. Alessio⁴⁸, M. Alexander⁵⁹, A. Alfonso Albero⁴⁵, Z. Aliouche⁶², G. Alkhazov³⁸, P. Alvarez Cartelle⁵⁵, S. Amato², Y. Amhis¹¹, L. An⁴⁸, L. Anderlini²², A. Andreianov³⁸, M. Andreotti²¹, F. Archilli¹⁷, A. Artamonov⁴⁴, M. Artuso⁶⁸, K. Arzymatov⁴², E. Aslanides¹⁰, M. Atzeni⁵⁰, B. Audurier¹², S. Bachmann¹⁷, M. Bachmayer⁴⁹, J. J. Back⁵⁶, P. Baladron Rodriguez⁴⁶, V. Balagura¹², W. Baldini²¹, J. Baptista Leite¹, R. J. Barlow⁶², S. Barsuk¹¹, W. Barter⁶¹, M. Bartolini²⁴, F. Baryshnikov⁸³, J. M. Basels¹⁴, G. Bassi²⁹, B. Batsukh⁶⁸, A. Battig¹⁵, A. Bay⁴⁹, M. Becker¹⁵, F. Bedeschi²⁹, I. Bediaga¹, A. Beiter⁶⁸, V. Belavin⁴², S. Belin²⁷, V. Bellee⁴⁹, K. Belous⁴⁴, I. Belov⁴⁰, I. Belyaev⁴¹, G. Bencivenni²³, E. Ben-Haim¹³, A. Berezhnoy⁴⁰, R. Bernet⁵⁰, D. Berninghoff¹⁷, H. C. Bernstein⁶⁸, C. Bertella⁴⁸, A. Bertolin²⁸, C. Betancourt⁵⁰, F. Betti⁴⁸, Ia. Bezshyiko⁵⁰, S. Bhasin⁵⁴, J. Bhom³⁵, L. Bian⁷³, M. S. Bieker¹⁵, S. Bifani⁵³, P. Billoir¹³, M. Birch⁶¹, F. C. R. Bishop⁵⁵, A. Bitadze⁶², A. Bizzeti^22,a, M. Bjørn⁶³, M. P. Blago⁴⁸, T. Blake⁵⁶, F. Blanc⁴⁹, S. Blusk⁶⁸, D. Bobulska⁵⁹, J. A. Boelhauve¹⁵, O. Boente Garcia⁴⁶, T. Boettcher⁶⁵, A. Boldyrev⁸², A. Bondar⁴³, N. Bondar^38,48, S. Borghi⁶², M. Borisyak⁴², M. Borsato¹⁷, J. T. Borsuk³⁵, S. A. Bouchiba⁴⁹, T. J. V. Bowcock⁶⁰, A. Boyer⁴⁸, C. Bozzi²¹, M. J. Bradley⁶¹, S. Braun⁶⁶, A. Brea Rodriguez⁴⁶, M. Brodski⁴⁸, J. Brodzicka³⁵, A. Brossa Gonzalo⁵⁶, D. Brundu²⁷, A. Buonaura⁵⁰, C. Burr⁴⁸, A. Bursche⁷², A. Butkevich³⁹, J. S. Butter³², J. Buytaert⁴⁸, W. Byczynski⁴⁸, S. Cadeddu²⁷, H. Cai⁷³, R. Calabrese^21,b, L. Calefice^15,13, L. Calero Diaz²³, S. Cali²³, R. Calladine⁵³, M. Calvi^26,c, M. Calvo Gomez⁸⁵, P. Camargo Magalhaes⁵⁴, P. Campana²³, A. F. Campoverde Quezada⁶, S. Capelli^26,c, L. Capriotti^20,d, A. Carbone^20,d, G. Carboni³¹, R. Cardinale²⁴, A. Cardini²⁷, I. Carli⁴, P. Carniti^26,c, L. Carus¹⁴, K. Carvalho Akiba³², A. Casais Vidal⁴⁶, G. Casse⁶⁰, M. Cattaneo⁴⁸, G. Cavallero⁴⁸, S. Celani⁴⁹, J. Cerasoli¹⁰, A. J. Chadwick⁶⁰, M. G. Chapman⁵⁴, M. Charles¹³, Ph. Charpentier⁴⁸, G. Chatzikonstantinidis⁵³, C. A. Chavez Barajas⁶⁰, M. Chefdeville⁸, C. Chen³, S. Chen⁴, A. Chernov³⁵, V. Chobanova⁴⁶, S. Cholak⁴⁹, M. Chrzaszcz³⁵, A. Chubykin³⁸, V. Chulikov³⁸, P. Ciambrone²³, M. F. Cicala⁵⁶, X. Cid Vidal⁴⁶, G. Ciezarek⁴⁸, P. E. L. Clarke⁵⁸, M. Clemencic⁴⁸, H. V. Cliff⁵⁵, J. Closier⁴⁸, J. L. Cobbledick⁶², V. Coco⁴⁸, J. A. B. Coelho¹¹, J. Cogan¹⁰, E. Cogneras⁹, L. Cojocariu³⁷, P. Collins⁴⁸, T. Colombo⁴⁸, L. Congedo^19,e, A. Contu²⁷, N. Cooke⁵³, G. Coombs⁵⁹, I. Corredoira⁴⁶, G. Corti⁴⁸, C. M. Costa Sobral⁵⁶, B. Couturier⁴⁸, D. C. Craik⁶⁴, J. Crkovská⁶⁷, M. Cruz Torres¹, R. Currie⁵⁸, C. L. Da Silva⁶⁷, S. Dadabaev⁸³, E. Dall’Occo¹⁵, J. Dalseno⁴⁶, C. D’Ambrosio⁴⁸, A. Danilina⁴¹, P. d’Argent⁴⁸, A. Davis⁶², O. De Aguiar Francisco⁶², K. De Bruyn⁷⁹, S. De Capua⁶², M. De Cian⁴⁹, J. M. De Miranda¹, L. De Paula², M. De Serio^19,e, D. De Simone⁵⁰, P. De Simone²³, J. A. de Vries⁸⁰, C. T. Dean⁶⁷, D. 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S. Fitzgerald⁸⁶, C. Fitzpatrick⁶², T. Fiutowski³⁴, A. Fkiaras⁴⁸, F. Fleuret¹², M. Fontana¹³, F. Fontanelli^24,i, R. Forty⁴⁸, V. Franco Lima⁶⁰, M. Franco Sevilla⁶⁶, M. Frank⁴⁸, E. Franzoso²¹, G. Frau¹⁷, C. Frei⁴⁸, D. A. Friday⁵⁹, J. Fu²⁵, Q. Fuehring¹⁵, W. Funk⁴⁸, E. Gabriel³², T. Gaintseva⁴², A. Gallas Torreira⁴⁶, D. Galli^20,d, S. Gambetta^58,48, Y. Gan³, M. Gandelman², P. Gandini²⁵, Y. Gao⁵, M. Garau²⁷, L. M. Garcia Martin⁵⁶, P. Garcia Moreno⁴⁵, J. García Pardiñas^26,c, B. Garcia Plana⁴⁶, F. A. Garcia Rosales¹², L. Garrido⁴⁵, C. Gaspar⁴⁸, R. E. Geertsema³², D. Gerick¹⁷, L. L. Gerken¹⁵, E. Gersabeck⁶², M. Gersabeck⁶², T. Gershon⁵⁶, D. Gerstel¹⁰, Ph. Ghez⁸, V. Gibson⁵⁵, H. K. Giemza³⁶, M. Giovannetti^23,j, A. Gioventù⁴⁶, P. Gironella Gironell⁴⁵, L. Giubega³⁷, C. Giugliano^21,48,b, K. Gizdov⁵⁸, E. L. Gkougkousis⁴⁸, V. V. Gligorov¹³, C. Göbel⁷⁰, E. Golobardes⁸⁵, D. Golubkov⁴¹, A. Golutvin^61,83, A. Gomes^1,k, S. Gomez Fernandez⁴⁵, F. Goncalves Abrantes⁶³, M. Goncerz³⁵, G. Gong³, P. 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Xie⁷, A. Xu⁵, J. Xu⁶, L. Xu³, M. Xu⁷, Q. Xu⁶, Z. Xu⁵, Z. Xu⁶, D. Yang³, S. Yang⁶, Y. Yang⁶, Z. Yang³, Z. Yang⁶⁶, Y. Yao⁶⁸, L. E. Yeomans⁶⁰, H. Yin⁷, J. Yu⁷¹, X. Yuan⁶⁸, O. Yushchenko⁴⁴, E. Zaffaroni⁴⁹, M. Zavertyaev^16,u, M. Zdybal³⁵, O. Zenaiev⁴⁸, M. Zeng³, D. Zhang⁷, L. Zhang³, S. Zhang⁵, Y. Zhang⁵, Y. Zhang⁶³, A. Zharkova⁸³, A. Zhelezov¹⁷, Y. Zheng⁶, X. Zhou⁶, Y. Zhou⁶, X. Zhu³, Z. Zhu⁶, V. Zhukov^14,40, J. B. Zonneveld⁵⁸, Q. Zou⁴, S. Zucchelli^20,d, D. Zuliani²⁸, and G. Zunica⁶² (LHCb Collaboration)

¹Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
²Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
³Center for High Energy Physics, Tsinghua University, Beijing, China
⁴Institute Of High Energy Physics (IHEP), Beijing, China
⁵School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China
⁶University of Chinese Academy of Sciences, Beijing, China
⁷Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
⁸Univ. Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France
⁹Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France
¹⁰Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
¹¹Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
¹²Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
¹³LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
¹⁴I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
¹⁵Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
¹⁶Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
¹⁷Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
¹⁸School of Physics, University College Dublin, Dublin, Ireland
¹⁹INFN Sezione di Bari, Bari, Italy
²⁰INFN Sezione di Bologna, Bologna, Italy
²¹INFN Sezione di Ferrara, Ferrara, Italy
²²INFN Sezione di Firenze, Firenze, Italy
²³INFN Laboratori Nazionali di Frascati, Frascati, Italy
²⁴INFN Sezione di Genova, Genova, Italy
²⁵INFN Sezione di Milano, Milano, Italy
²⁶INFN Sezione di Milano-Bicocca, Milano, Italy
²⁷INFN Sezione di Cagliari, Monserrato, Italy
²⁸Universita degli Studi di Padova, Universita e INFN, Padova, Padova, Italy
²⁹INFN Sezione di Pisa, Pisa, Italy
³⁰INFN Sezione di Roma La Sapienza, Roma, Italy
³¹INFN Sezione di Roma Tor Vergata, Roma, Italy
³²Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands
³³Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands
³⁴AGH—University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland
³⁵Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
³⁶National Center for Nuclear Research (NCBJ), Warsaw, Poland
³⁷Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
³⁸Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI), Gatchina, Russia
³⁹Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS), Moscow, Russia
⁴⁰Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
⁴¹Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia
⁴²Yandex School of Data Analysis, Moscow, Russia
⁴³Budker Institute of Nuclear Physics (SB RAS), Novosibirsk, Russia
⁴⁴Institute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI), Protvino, Russia
⁴⁵ICCUB, Universitat de Barcelona, Barcelona, Spain
⁴⁶Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
⁴⁷Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia—CSIC, Valencia, Spain
⁴⁸European Organization for Nuclear Research (CERN), Geneva, Switzerland
⁴⁹Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
⁵⁰Physik-Institut, Universität Zürich, Zürich, Switzerland
⁵¹NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
⁵²Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
⁵³University of Birmingham, Birmingham, United Kingdom
⁵⁴H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
⁵⁵Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
⁵⁶Department of Physics, University of Warwick, Coventry, United Kingdom
⁵⁷STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
⁵⁸School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
⁵⁹School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
⁶⁰Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
⁶¹Imperial College London, London, United Kingdom
⁶²Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
⁶³Department of Physics, University of Oxford, Oxford, United Kingdom
⁶⁴Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
⁶⁵University of Cincinnati, Cincinnati, Ohio, USA
⁶⁶University of Maryland, College Park, Maryland, USA
⁶⁷Los Alamos National Laboratory (LANL), Los Alamos, USA
⁶⁸Syracuse University, Syracuse, New York, USA
⁶⁹School of Physics and Astronomy, Monash University, Melbourne, Australia (associated with Department of Physics, University of Warwick, Coventry, United Kingdom)
⁷⁰Pontifícia 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)
⁷¹Physics and Micro Electronic College, Hunan University, Changsha City, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China)
⁷²Guangdong Provincial Key Laboratory of Nuclear Science, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Institute of Quantum Matter, South China Normal University, Guangzhou, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China)
⁷³School of Physics and Technology, Wuhan University, Wuhan, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China)
⁷⁴Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France)
⁷⁵Universität Bonn—Helmholtz-Institut für Strahlen und Kernphysik, Bonn, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany)
⁷⁶Institut für Physik, Universität Rostock, Rostock, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany)
⁷⁷Eotvos Lorand University, Budapest, Hungary (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland)
⁷⁸INFN Sezione di Perugia, Perugia, Italy (associated with INFN Sezione di Ferrara, Ferrara, Italy)
⁷⁹Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁸⁰Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁸¹National Research Centre Kurchatov Institute, Moscow, Russia (associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia)
⁸²National Research University Higher School of Economics, Moscow, Russia (associated with Yandex School of Data Analysis, Moscow, Russia)
⁸³National University of Science and Technology “MISIS”, Moscow, Russia (associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia)
⁸⁴National Research Tomsk Polytechnic University, Tomsk, Russia (associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia)
⁸⁵DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain (associated with ICCUB, Universitat de Barcelona, Barcelona, Spain)
⁸⁶University of Michigan, Ann Arbor, USA (associated with Syracuse University, Syracuse, New York, USA)

^*Full author list given at the end of the article.
^aAlso at Università di Modena e Reggio Emilia, Modena, Italy.
^bAlso at Università di Ferrara, Ferrara, Italy.
^cAlso at Università di Milano Bicocca, Milano, Italy.
^dAlso at Università di Bologna, Bologna, Italy.
^eAlso at Università di Bari, Bari, Italy.
^fAlso at Università di Cagliari, Cagliari, Italy.
^gAlso at Novosibirsk State University, Novosibirsk, Russia.
^hAlso at Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
ⁱAlso at Università di Genova, Genova, Italy.
^jAlso at Università di Roma Tor Vergata, Roma, Italy.
^kAlso at Universidade Federal do Triângulo Mineiro (UFTM), Uberaba-MG, Brazil.
^lAlso at Hangzhou Institute for Advanced Study, UCAS, Hangzhou, China.
^mAlso at AGH—University of Science and Technology, Faculty of Computer Science, Electronics and Telecommunications, Kraków, Poland.
ⁿAlso at Università di Siena, Siena, Italy.
^oAlso at Università di Padova, Padova, Italy.
^pAlso at Scuola Normale Superiore, Pisa, Italy.
^qAlso at Università degli Studi di Milano, Milano, Italy.
^rAlso at MSU—Iligan Institute of Technology (MSU-IIT), Iligan, Philippines.
^sAlso at Università di Firenze, Firenze, Italy.
^tAlso at Hanoi University of Science, Hanoi, Vietnam.
^uAlso at P.N. Lebedev Physical Institute, Russian Academy of Science (LPI RAS), Moscow, Russia.
^vAlso at Università di Pisa, Pisa, Italy.
^wAlso at Università della Basilicata, Potenza, Italy.
^xAlso at Università di Urbino, Urbino, Italy.

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Phys. Rev. D 104, L091102 – Published 24 November, 2021

DOI: https://doi.org/10.1103/PhysRevD.104.L091102

Abstract

The first observation of the $Ω_{b}^{-} \to Ξ_{c}^{+} K^{-} π^{-}$ decay is reported using $p$ $p$ collision data at center of mass energies of 7, 8, and 13 TeV collected by the LHCb experiment, corresponding to an integrated luminosity of $9 {fb}^{- 1}$ . Four excited $Ω_{c}^{0}$ baryons are observed in the $Ξ_{c}^{+}$ $K^{-}$ mass projection of the $Ω_{b}^{-} \to Ξ_{c}^{+} K^{-} π^{-}$ decays with the significance of each exceeding five standard deviations. They coincide with the states previously observed in prompt $p p$ and $e^{+} e^{-}$ production. Relative production rates, masses, and natural widths of the states are measured, and a test of spin hypotheses is performed. Moreover, the branching ratio of $Ω_{b}^{-} \to Ξ_{c}^{+} K^{-} π^{-}$ is measured relative to the $Ω_{b}^{-} \to Ω_{c}^{0} π^{-}$ decay mode and a precise measurement of the $Ω_{b}^{-}$ mass of $6044.3 \pm 1.2 \pm 1. 1_{- 0.22}^{+ 0.19} MeV$ is obtained.

Physics Subject Headings (PhySH)

Article Text

Supplemental Material

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Phys. Rev. D 104, L091102– Published 24 November, 2021

Vol. 104, Iss. 9 — 1 November 2021

Received 8 July 2021
Accepted 14 September 2021

DOI: https://doi.org/10.1103/PhysRevD.104.L091102

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Observation of excited $Ω_{c}^{0}$ baryons in $Ω_{b}^{-} \to Ξ_{c}^{+} K^{-} π^{-}$ decays

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Observation of excited Ωc0 baryons in Ωb−→Ξc+K−π− decays

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Observation of excited $Ω_{c}^{0}$ baryons in $Ω_{b}^{-} \to Ξ_{c}^{+} K^{-} π^{-}$ decays