Search for excited Bc        + states

R. Aaij; B. Adeva; Z. Ajaltouni; S. Akar; 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; E. Aslanides; M. Atzeni; G. Auriemma; M. Baalouch; I. Babuschkin; S. Bachmann; J. J. Back; A. Badalov; C. Baesso; K. Carvalho Akiba; V. Coco; K. De Bruyn; M. Ferro-Luzzi; T. Ketel; M. Merk; C. J.G. Onderwater; G. Raven; M. Schiller; N. Serra; B. Storaci; V. Syropoulos; J. van Tilburg; S. Tolk; P. Tsopelas; N. Tuning; The LHCb collaboration

doi:10.1007/JHEP01(2018)138

Search for excited B_c ⁺ states

R. Aaij, B. Adeva, Z. Ajaltouni, S. Akar, 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. ApplebyF. Archilli, P. d’Argent, J. Arnau Romeu, A. Artamonov, M. Artuso, E. Aslanides, M. Atzeni, G. Auriemma, M. Baalouch, I. Babuschkin, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, K. Carvalho Akiba, V. Coco, K. De Bruyn, M. Ferro-Luzzi, T. Ketel, M. Merk, C. J.G. Onderwater, G. Raven, M. Schiller, N. Serra, B. Storaci, V. Syropoulos, J. van Tilburg, S. Tolk, P. Tsopelas, N. Tuning, The LHCb collaboration

^*Corresponding author for this work

(Astro)-Particles Physics

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

Abstract

A search is performed in the invariant mass spectrum of the B_c ⁺π⁺π⁻ system for the excited B_c ⁺ states B_c(2¹S₀)⁺ and B_c(2³S₁)⁺ using a data sample of pp collisions collected by the LHCb experiment at the centre-of-mass energy of s=8 TeV, corresponding to an integrated luminosity of 2 fb⁻¹. No evidence is seen for either state. Upper limits on the ratios of the production cross-sections of the B_c(2¹S₀)⁺ and B_c(2³S₁)⁺ states times the branching fractions of B_c(2¹S₀)⁺ → B_c ⁺π⁺π⁻ and B_c(2³S₁)⁺ → B_c ^* ⁺π⁺π⁻ over the production cross-section of the B_c ⁺ state are given as a function of their masses. They are found to be between 0.02 and 0.14 at 95% confidence level for B_c(2¹S₀)⁺ and B_c(2³S₁)⁺ in the mass ranges [6830, 6890] MeV/c² and [6795, 6890] MeV/c², respectively.[Figure not available: see fulltext.].

Original language	English
Article number	138
Journal	Journal of High Energy Physics
Volume	2018
Issue number	1
DOIs	https://doi.org/10.1007/JHEP01(2018)138
Publication status	Published - 1 Jan 2018

Funding

We thank Chao-Hsi Chang and Xing-Gang Wu for frequent and interesting discussions on the production of the Bc mesons. 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 (The Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MinES and FASO (Russia); MinECo (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); NSF (U.S.A.). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (The Netherlands), PIC (Spain), GridPP (United Kingdom), RRCKI and Yandex LLC (Russia), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), PL-GRID (Poland) and OSC (U.S.A.). 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 Sklodowska-Curie Actions and ERC (European Union), ANR, Labex P2IO, ENIGMASS and OCEVU, and Région Auvergne-Rhône-Alpes (France), RFBR and Yandex LLC (Russia), GVA, XuntaGal and GENCAT (Spain), Herchel Smith Fund, the Royal Society, the English-Speaking Union and the Lev-erhulme Trust (United Kingdom).

Funders	Funder number
Not added	1796908, ST/H006737/1, ST/N000463/1, ST/N000242/1
AvH Foundation
CNRS/IN2P3
EPLANET
FASO
Herchel Smith Fund
Lev-erhulme Trust
MinES
OCEVU
Yandex LLC
National Science Foundation
School of Energy Resources, University of Wyoming
H2020 Marie Skłodowska-Curie Actions
CERN
Science and Technology Facilities Council	ST/J004332/1, ST/N000250/1, 1641747, 1681016, ST/K003410/1, LHCb, ST/N000331/1, GRIDPP, LHCb Upgrades
Royal Society
English-Speaking Union
European Commission
European Research Council
Deutsche Forschungsgemeinschaft
Agence Nationale de la Recherche
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung	166208
National Natural Science Foundation of China
Russian Foundation for Basic Research
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Bundesministerium für Bildung und Forschung
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Generalitat Valenciana
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Ministry of Science and Technology
Instituto Nazionale di Fisica Nucleare
Narodowe Centrum Nauki
Ministerstwo Nauki i Szkolnictwa Wyższego
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
National Academy of Sciences of Ukraine
Financiadora de Estudos e Projetos
Région Auvergne-Rhône-Alpes

Keywords

B physics
Hadron-Hadron scattering (experiments)
Spectroscopy

UN SDGs

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

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10.1007/JHEP01(2018)138

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Aaij, R., Adeva, B., Ajaltouni, Z., Akar, S., Alessio, F., Alexander, M., Alfonso Albero, A., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A. A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., Andrews, J. E., ... The LHCb collaboration (2018). Search for excited B_c ⁺ states. Journal of High Energy Physics, 2018(1), Article 138. https://doi.org/10.1007/JHEP01(2018)138

@article{4113cdb1a15d410aa283bfe5ba9bb6f9,

title = "Search for excited Bc + states",

abstract = "A search is performed in the invariant mass spectrum of the Bc +π+π− system for the excited Bc + states Bc(21S0)+ and Bc(23S1)+ using a data sample of pp collisions collected by the LHCb experiment at the centre-of-mass energy of s=8 TeV, corresponding to an integrated luminosity of 2 fb−1. No evidence is seen for either state. Upper limits on the ratios of the production cross-sections of the Bc(21S0)+ and Bc(23S1)+ states times the branching fractions of Bc(21S0)+ → Bc +π+π− and Bc(23S1)+ → Bc * +π+π− over the production cross-section of the Bc + state are given as a function of their masses. They are found to be between 0.02 and 0.14 at 95% confidence level for Bc(21S0)+ and Bc(23S1)+ in the mass ranges [6830, 6890] MeV/c2 and [6795, 6890] MeV/c2, respectively.[Figure not available: see fulltext.].",

keywords = "B physics, Hadron-Hadron scattering (experiments), Spectroscopy",

author = "R. Aaij and B. Adeva and Z. Ajaltouni and S. Akar and F. Alessio and M. Alexander and {Alfonso Albero}, A. and S. Ali and G. Alkhazov and {Alvarez Cartelle}, P. and Alves, {A. A.} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and G. Andreassi and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and F. Archilli and P. d{\textquoteright}Argent and {Arnau Romeu}, J. and A. Artamonov and M. Artuso and E. Aslanides and M. Atzeni and G. Auriemma and M. Baalouch and I. Babuschkin and S. Bachmann and Back, {J. J.} and A. Badalov and C. Baesso and {Carvalho Akiba}, K. and V. Coco and {De Bruyn}, K. and M. Ferro-Luzzi and T. Ketel and M. Merk and Onderwater, {C. J.G.} and G. Raven and M. Schiller and N. Serra and B. Storaci and V. Syropoulos and {van Tilburg}, J. and S. Tolk and P. Tsopelas and N. Tuning and {The LHCb collaboration}",

year = "2018",

month = jan,

day = "1",

doi = "10.1007/JHEP01(2018)138",

language = "English",

volume = "2018",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

publisher = "Springer Verlag",

number = "1",

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Aaij, R, Adeva, B, Ajaltouni, Z, Akar, S, Alessio, F, Alexander, M, Alfonso Albero, A, Ali, S, Alkhazov, G, Alvarez Cartelle, P, Alves, AA, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Andrews, JE, Appleby, RB, Archilli, F, d’Argent, P, Arnau Romeu, J, Artamonov, A, Artuso, M, Aslanides, E, Atzeni, M, Auriemma, G, Baalouch, M, Babuschkin, I, Bachmann, S, Back, JJ, Badalov, A, Baesso, C, Carvalho Akiba, K, Coco, V, De Bruyn, K, Ferro-Luzzi, M, Ketel, T, Merk, M, Onderwater, CJG, Raven, G, Schiller, M, Serra, N, Storaci, B, Syropoulos, V, van Tilburg, J, Tolk, S, Tsopelas, P, Tuning, N & The LHCb collaboration 2018, 'Search for excited B_c ⁺ states', Journal of High Energy Physics, vol. 2018, no. 1, 138. https://doi.org/10.1007/JHEP01(2018)138

TY - JOUR

T1 - Search for excited Bc + states

AU - Aaij, R.

AU - Adeva, B.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Alessio, F.

AU - Alexander, M.

AU - Alfonso Albero, A.

AU - Ali, S.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amerio, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Archilli, F.

AU - d’Argent, P.

AU - Arnau Romeu, J.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Auriemma, G.

AU - Baalouch, M.

AU - Babuschkin, I.

AU - Bachmann, S.

AU - Back, J. J.

AU - Badalov, A.

AU - Baesso, C.

AU - Carvalho Akiba, K.

AU - Coco, V.

AU - De Bruyn, K.

AU - Ferro-Luzzi, M.

AU - Ketel, T.

AU - Merk, M.

AU - Onderwater, C. J.G.

AU - Raven, G.

AU - Schiller, M.

AU - Serra, N.

AU - Storaci, B.

AU - Syropoulos, V.

AU - van Tilburg, J.

AU - Tolk, S.

AU - Tsopelas, P.

AU - Tuning, N.

AU - The LHCb collaboration

PY - 2018/1/1

Y1 - 2018/1/1

N2 - A search is performed in the invariant mass spectrum of the Bc +π+π− system for the excited Bc + states Bc(21S0)+ and Bc(23S1)+ using a data sample of pp collisions collected by the LHCb experiment at the centre-of-mass energy of s=8 TeV, corresponding to an integrated luminosity of 2 fb−1. No evidence is seen for either state. Upper limits on the ratios of the production cross-sections of the Bc(21S0)+ and Bc(23S1)+ states times the branching fractions of Bc(21S0)+ → Bc +π+π− and Bc(23S1)+ → Bc * +π+π− over the production cross-section of the Bc + state are given as a function of their masses. They are found to be between 0.02 and 0.14 at 95% confidence level for Bc(21S0)+ and Bc(23S1)+ in the mass ranges [6830, 6890] MeV/c2 and [6795, 6890] MeV/c2, respectively.[Figure not available: see fulltext.].

AB - A search is performed in the invariant mass spectrum of the Bc +π+π− system for the excited Bc + states Bc(21S0)+ and Bc(23S1)+ using a data sample of pp collisions collected by the LHCb experiment at the centre-of-mass energy of s=8 TeV, corresponding to an integrated luminosity of 2 fb−1. No evidence is seen for either state. Upper limits on the ratios of the production cross-sections of the Bc(21S0)+ and Bc(23S1)+ states times the branching fractions of Bc(21S0)+ → Bc +π+π− and Bc(23S1)+ → Bc * +π+π− over the production cross-section of the Bc + state are given as a function of their masses. They are found to be between 0.02 and 0.14 at 95% confidence level for Bc(21S0)+ and Bc(23S1)+ in the mass ranges [6830, 6890] MeV/c2 and [6795, 6890] MeV/c2, respectively.[Figure not available: see fulltext.].

KW - B physics

KW - Hadron-Hadron scattering (experiments)

KW - Spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=85041861901&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85041861901&partnerID=8YFLogxK

U2 - 10.1007/JHEP01(2018)138

DO - 10.1007/JHEP01(2018)138

M3 - Article

AN - SCOPUS:85041861901

SN - 1126-6708

VL - 2018

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 1

M1 - 138

ER -