Observation of new excited Bs0 states

LHCb Collaboration

doi:10.1140/epjc/s10052-021-09305-3

Observation of new excited Bs0 states

LHCb Collaboration

(Astro)-Particles Physics

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

© 2021, The Author(s).A structure is observed in the B±K∓ mass spectrum in a sample of proton–proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of 9fb-1. The structure is interpreted as the result of overlapping excited Bs0 states. With high significance, a two-peak hypothesis provides a better description of the data than a single resonance. Under this hypothesis the masses and widths of the two states, assuming they decay directly to B±K∓, are determined to be m1=6063.5±1.2(stat)±0.8(syst)Me,Γ1=26±4(stat)±4(syst)Me,m2=6114±3(stat)±5(syst)Me,Γ2=66±18(stat)±21(syst)Me.Alternative values assuming a decay through B∗ ±K∓, with a missing photon from the B∗ ±→ B±γ decay, which are shifted by approximately 45MeV, are also determined. The possibility of a single state decaying in both channels is also considered. The ratio of the total production cross-section times branching fraction of the new states relative to the previously observed Bs2∗0 state is determined to be 0.87±0.15(stat)±0.19(syst).

Original language	English
Article number	601
Journal	European Physical Journal C
Volume	81
Issue number	7
DOIs	https://doi.org/10.1140/epjc/s10052-021-09305-3
Publication status	Published - 1 Jul 2021

Funding

We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MSHE (Russia); MICINN (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (USA). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), RRCKI and Yandex LLC (Russia), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), PL-GRID (Poland) and OSC (USA). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from AvH Foundation (Germany); EPLANET, Marie Skłodowska-Curie Actions and ERC (European Union); A*MIDEX, ANR, Labex P2IO and OCEVU, and Région Auvergne-Rhône-Alpes (France); Key Research Program of Frontier Sciences of CAS, CAS PIFI, Thousand Talents Program, and Sci. & Tech. Program of Guangzhou (China); RFBR, RSF and Yandex LLC (Russia); GVA, XuntaGal and GENCAT (Spain); the Royal Society and the Leverhulme Trust (United Kingdom).

Funders	Funder number
EPLANET
Key Research Program of Frontier Sciences of CAS
MSHE
OCEVU
National Science Foundation
U.S. Department of Energy
Alexander von Humboldt-Stiftung
H2020 Marie Skłodowska-Curie Actions
CERN
Science and Technology Facilities Council
European Research Council
Deutsche Forschungsgemeinschaft
Agence Nationale de la Recherche
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
National Natural Science Foundation of China
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Bundesministerium für Bildung und Forschung
Chinese Academy of Sciences
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Instituto Nazionale di Fisica Nucleare
Narodowe Centrum Nauki
Ministerstwo Edukacji i Nauki
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
Ministry of Science and Technology, Taiwan
National Academy of Sciences of Ukraine
Centre National de la Recherche Scientifique
Financiadora de Estudos e Projetos
Ministerio de Ciencia e Innovación
Région Auvergne-Rhône-Alpes
Recruitment Program of Global Experts
Institut national de physique nucléaire et de physique des particules
Sociedad Española de Reumatología

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1140/epjc/s10052-021-09305-3

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Cite this

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title = "Observation of new excited Bs0 states",

abstract = "{\textcopyright} 2021, The Author(s).A structure is observed in the B±K∓ mass spectrum in a sample of proton–proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of 9fb-1. The structure is interpreted as the result of overlapping excited Bs0 states. With high significance, a two-peak hypothesis provides a better description of the data than a single resonance. Under this hypothesis the masses and widths of the two states, assuming they decay directly to B±K∓, are determined to be m1=6063.5±1.2(stat)±0.8(syst)Me,Γ1=26±4(stat)±4(syst)Me,m2=6114±3(stat)±5(syst)Me,Γ2=66±18(stat)±21(syst)Me.Alternative values assuming a decay through B∗ ±K∓, with a missing photon from the B∗ ±→ B±γ decay, which are shifted by approximately 45MeV, are also determined. The possibility of a single state decaying in both channels is also considered. The ratio of the total production cross-section times branching fraction of the new states relative to the previously observed Bs2∗0 state is determined to be 0.87±0.15(stat)±0.19(syst).",

author = "R. Aaij and C.A. Beteta and T. Ackernley and B. Adeva and M. Adinolfi and H. Afsharnia and C.A. Aidala and S. Aiola and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and A.A. Albero and Z. Aliouche and G. Alkhazov and P.A. Cartelle and S. Amato and Y. Amhis and L. An and L. Anderlini and A. Andreianov and M. Andreotti and F. Archilli and A. Artamonov and M. Artuso and K. Arzymatov and E. Aslanides and M. Atzeni and B. Audurier and S. Bachmann and M. Bachmayer and J.J. Back and S. Baker and P.B. Rodriguez and V. Balagura and W. Baldini and J.B. Leite and R.J. Barlow and S. Barsuk and W. Barter and M. Bartolini and F. Baryshnikov and J.M. Basels and G. Bassi and B. Batsukh and A. Battig and A. Bay and M. Becker and F. Bedeschi and I. Bediaga and A. Beiter and V. Belavin and S. Belin and V. Bellee and K. Belous and I. Belov and I. Belyaev and G. Bencivenni and E. Ben-Haim and A. Berezhnoy and R. Bernet and D. Berninghoff and H.C. Bernstein and C. 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Veronesi and M. Vesterinen and D. Vieira and M.V. Diaz and H. Viemann and X. Vilasis-Cardona and E.V. Figueras and P. Vincent and G. Vitali and A. Vollhardt and D.V. Bruch and A. Vorobyev and V. Vorobyev and N. Voropaev and R. Waldi and J. Walsh and C. Wang and J. Wang and J. Wang and J. Wang and J. Wang and M. Wang and R. Wang and Y. Wang and Z. Wang and D.R. Ward and H.M. Wark and N.K. Watson and S.G. Weber and D. Websdale and C. Weisser and B.D.C. Westhenry and D.J. White and M. Whitehead and D. Wiedner and G. Wilkinson and M. Wilkinson and I. Williams and M. Williams and M.R.J. Williams and F.F. Wilson and W. Wislicki and M. Witek and L. Witola and G. Wormser and S.A. Wotton and H. Wu and K. Wyllie and Z. Xiang and D. Xiao and Y. Xie and H. Xing and A. Xu and J. Xu and L. Xu and M. Xu and Q. Xu and Z. Xu and Z. Xu and D. Yang and Y. Yang and Z. Yang and Z. Yang and Y. Yao and L.E. Yeomans and H. Yin and J. Yu and X. Yuan and O. Yushchenko and K.A. Zarebski and M. Zavertyaev and M. Zdybal and O. Zenaiev and M. Zeng and D. Zhang and L. Zhang and S. Zhang and Y. Zhang and Y. Zhang and A. Zhelezov and Y. Zheng and X. Zhou and Y. Zhou and X. Zhu and V. Zhukov and J.B. Zonneveld and S. Zucchelli and D. Zuliani and G. Zunica and {LHCb Collaboration}",

year = "2021",

month = jul,

day = "1",

doi = "10.1140/epjc/s10052-021-09305-3",

language = "English",

volume = "81",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer Nature",

number = "7",

}

TY - JOUR

T1 - Observation of new excited Bs0 states

AU - Aaij, R.

AU - Beteta, C.A.

AU - Ackernley, T.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Afsharnia, H.

AU - Aidala, C.A.

AU - Aiola, S.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Albero, A.A.

AU - Aliouche, Z.

AU - Alkhazov, G.

AU - Cartelle, P.A.

AU - Amato, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreianov, A.

AU - Andreotti, M.

AU - Archilli, F.

AU - Artamonov, A.

AU - Artuso, M.

AU - Arzymatov, K.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Audurier, B.

AU - Bachmann, S.

AU - Bachmayer, M.

AU - Back, J.J.

AU - Baker, S.

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AU - LHCb Collaboration

PY - 2021/7/1

Y1 - 2021/7/1

N2 - © 2021, The Author(s).A structure is observed in the B±K∓ mass spectrum in a sample of proton–proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of 9fb-1. The structure is interpreted as the result of overlapping excited Bs0 states. With high significance, a two-peak hypothesis provides a better description of the data than a single resonance. Under this hypothesis the masses and widths of the two states, assuming they decay directly to B±K∓, are determined to be m1=6063.5±1.2(stat)±0.8(syst)Me,Γ1=26±4(stat)±4(syst)Me,m2=6114±3(stat)±5(syst)Me,Γ2=66±18(stat)±21(syst)Me.Alternative values assuming a decay through B∗ ±K∓, with a missing photon from the B∗ ±→ B±γ decay, which are shifted by approximately 45MeV, are also determined. The possibility of a single state decaying in both channels is also considered. The ratio of the total production cross-section times branching fraction of the new states relative to the previously observed Bs2∗0 state is determined to be 0.87±0.15(stat)±0.19(syst).

AB - © 2021, The Author(s).A structure is observed in the B±K∓ mass spectrum in a sample of proton–proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of 9fb-1. The structure is interpreted as the result of overlapping excited Bs0 states. With high significance, a two-peak hypothesis provides a better description of the data than a single resonance. Under this hypothesis the masses and widths of the two states, assuming they decay directly to B±K∓, are determined to be m1=6063.5±1.2(stat)±0.8(syst)Me,Γ1=26±4(stat)±4(syst)Me,m2=6114±3(stat)±5(syst)Me,Γ2=66±18(stat)±21(syst)Me.Alternative values assuming a decay through B∗ ±K∓, with a missing photon from the B∗ ±→ B±γ decay, which are shifted by approximately 45MeV, are also determined. The possibility of a single state decaying in both channels is also considered. The ratio of the total production cross-section times branching fraction of the new states relative to the previously observed Bs2∗0 state is determined to be 0.87±0.15(stat)±0.19(syst).

U2 - 10.1140/epjc/s10052-021-09305-3

DO - 10.1140/epjc/s10052-021-09305-3

M3 - Article

SN - 1434-6044

VL - 81

JO - European Physical Journal C

JF - European Physical Journal C

IS - 7

M1 - 601

ER -

Observation of new excited Bs0 states

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UN SDGs

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