First observation of excited Ω_{b}^{-} states
We report four narrow peaks in the Ξ_{b}^{0}K^{-} mass spectrum obtained using pp collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb^{-1} recorded by the LHCb experiment. Referring to these states by their mass, the mass values are m[Ω_...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
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American Physical Society
2020
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| _version_ | 1797084886245310464 |
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| author | Aaij, R Abellán Beteta, C Ackernley, T Adeva, B Adinolfi, M Afsharnia, H Aidala, CA Aiola, S Ajaltouni, Z Akar, S Albicocco, P Albrecht, J Alessio, F Alexander, M Alfonso Albero, A Alkhazov, G Alvarez Cartelle, P Alves, AA Amato, S Amhis, Y An, L Anderlini, L Andreassi, G Andreotti, M Archilli, F Arnau Romeu, J Artamonov, A Artuso, M Arzymatov, K Aslanides, E Atzeni, M Audurier, B Bachmann, B Back, JJ Baker, S Balagura, V Baldini, W Baranov, A Barlow, RJ Barsuk, S Barter, W Bartolini, M Baryshnikov, F Bassi, G Batozskaya, V Batsukh, B Battig, A Bay, B Becker, M Bedeschi, B |
| author_facet | Aaij, R Abellán Beteta, C Ackernley, T Adeva, B Adinolfi, M Afsharnia, H Aidala, CA Aiola, S Ajaltouni, Z Akar, S Albicocco, P Albrecht, J Alessio, F Alexander, M Alfonso Albero, A Alkhazov, G Alvarez Cartelle, P Alves, AA Amato, S Amhis, Y An, L Anderlini, L Andreassi, G Andreotti, M Archilli, F Arnau Romeu, J Artamonov, A Artuso, M Arzymatov, K Aslanides, E Atzeni, M Audurier, B Bachmann, B Back, JJ Baker, S Balagura, V Baldini, W Baranov, A Barlow, RJ Barsuk, S Barter, W Bartolini, M Baryshnikov, F Bassi, G Batozskaya, V Batsukh, B Battig, A Bay, B Becker, M Bedeschi, B |
| author_sort | Aaij, R |
| collection | OXFORD |
| description | We report four narrow peaks in the Ξ_{b}^{0}K^{-} mass spectrum obtained using pp collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb^{-1} recorded by the LHCb experiment. Referring to these states by their mass, the mass values are m[Ω_{b}(6316)^{-}]=6315.64±0.31±0.07±0.50 MeV, m[Ω_{b}(6330)^{-}]=6330.30±0.28±0.07±0.50 MeV, m[Ω_{b}(6340)^{-}]=6339.71±0.26±0.05±0.50 MeV, m[Ω_{b}(6350)^{-}]=6349.88±0.35±0.05±0.50 MeV, where the uncertainties are statistical, systematic, and the last is due to the knowledge of the Ξ_{b}^{0} mass. The natural widths of the three lower mass states are consistent with zero, and the 90% confidence-level upper limits are determined to be Γ[Ω_{b}(6316)^{-}]<2.8 MeV, Γ[Ω_{b}(6330)^{-}]<3.1 MeV and Γ[Ω_{b}(6340)^{-}]<1.5 MeV. The natural width of the Ω_{b}(6350)^{-} peak is 1.4_{-0.8}^{+1.0}±0.1 MeV, which is 2.5σ from zero and corresponds to an upper limit of 2.8 MeV. The peaks have local significances ranging from 3.6σ to 7.2σ. After accounting for the look-elsewhere effect, the significances of the Ω_{b}(6316)^{-} and Ω_{b}(6330)^{-} peaks are reduced to 2.1σ and 2.6σ, respectively, while the two higher mass peaks exceed 5σ. The observed peaks are consistent with expectations for excited Ω_{b}^{-} resonances. |
| first_indexed | 2024-03-07T02:01:25Z |
| format | Journal article |
| id | oxford-uuid:9d7eed8e-a4a3-448b-809b-e259414d1fed |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:01:25Z |
| publishDate | 2020 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:9d7eed8e-a4a3-448b-809b-e259414d1fed2022-03-27T00:43:40ZFirst observation of excited Ω_{b}^{-} statesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:9d7eed8e-a4a3-448b-809b-e259414d1fedEnglishSymplectic ElementsAmerican Physical Society2020Aaij, RAbellán Beteta, CAckernley, TAdeva, BAdinolfi, MAfsharnia, HAidala, CAAiola, SAjaltouni, ZAkar, SAlbicocco, PAlbrecht, JAlessio, FAlexander, MAlfonso Albero, AAlkhazov, GAlvarez Cartelle, PAlves, AAAmato, SAmhis, YAn, LAnderlini, LAndreassi, GAndreotti, MArchilli, FArnau Romeu, JArtamonov, AArtuso, MArzymatov, KAslanides, EAtzeni, MAudurier, BBachmann, BBack, JJBaker, SBalagura, VBaldini, WBaranov, ABarlow, RJBarsuk, SBarter, WBartolini, MBaryshnikov, FBassi, GBatozskaya, VBatsukh, BBattig, ABay, BBecker, MBedeschi, BWe report four narrow peaks in the Ξ_{b}^{0}K^{-} mass spectrum obtained using pp collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb^{-1} recorded by the LHCb experiment. Referring to these states by their mass, the mass values are m[Ω_{b}(6316)^{-}]=6315.64±0.31±0.07±0.50 MeV, m[Ω_{b}(6330)^{-}]=6330.30±0.28±0.07±0.50 MeV, m[Ω_{b}(6340)^{-}]=6339.71±0.26±0.05±0.50 MeV, m[Ω_{b}(6350)^{-}]=6349.88±0.35±0.05±0.50 MeV, where the uncertainties are statistical, systematic, and the last is due to the knowledge of the Ξ_{b}^{0} mass. The natural widths of the three lower mass states are consistent with zero, and the 90% confidence-level upper limits are determined to be Γ[Ω_{b}(6316)^{-}]<2.8 MeV, Γ[Ω_{b}(6330)^{-}]<3.1 MeV and Γ[Ω_{b}(6340)^{-}]<1.5 MeV. The natural width of the Ω_{b}(6350)^{-} peak is 1.4_{-0.8}^{+1.0}±0.1 MeV, which is 2.5σ from zero and corresponds to an upper limit of 2.8 MeV. The peaks have local significances ranging from 3.6σ to 7.2σ. After accounting for the look-elsewhere effect, the significances of the Ω_{b}(6316)^{-} and Ω_{b}(6330)^{-} peaks are reduced to 2.1σ and 2.6σ, respectively, while the two higher mass peaks exceed 5σ. The observed peaks are consistent with expectations for excited Ω_{b}^{-} resonances. |
| spellingShingle | Aaij, R Abellán Beteta, C Ackernley, T Adeva, B Adinolfi, M Afsharnia, H Aidala, CA Aiola, S Ajaltouni, Z Akar, S Albicocco, P Albrecht, J Alessio, F Alexander, M Alfonso Albero, A Alkhazov, G Alvarez Cartelle, P Alves, AA Amato, S Amhis, Y An, L Anderlini, L Andreassi, G Andreotti, M Archilli, F Arnau Romeu, J Artamonov, A Artuso, M Arzymatov, K Aslanides, E Atzeni, M Audurier, B Bachmann, B Back, JJ Baker, S Balagura, V Baldini, W Baranov, A Barlow, RJ Barsuk, S Barter, W Bartolini, M Baryshnikov, F Bassi, G Batozskaya, V Batsukh, B Battig, A Bay, B Becker, M Bedeschi, B First observation of excited Ω_{b}^{-} states |
| title | First observation of excited Ω_{b}^{-} states |
| title_full | First observation of excited Ω_{b}^{-} states |
| title_fullStr | First observation of excited Ω_{b}^{-} states |
| title_full_unstemmed | First observation of excited Ω_{b}^{-} states |
| title_short | First observation of excited Ω_{b}^{-} states |
| title_sort | first observation of excited ω b states |
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