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Title: | Observation of a New Excited Beauty Strange Baryon Decaying to Ξb- π+π- |
Authors: | Sirunyan, AM Tumasyan, A Adam, W Andrejkovic, JW Bergauer, T Chatterjee, S Dragicevic, M Escalante Del Valle, A Frühwirth, R Jeitler, M Krammer, N Bethani, A Bruno, G Bury, F Caputo, C David, P Teodorescu, L Delaere, C Donertas, IS Giammanco, A Jaffel, K Lemaitre, V Reid, ID Mondal, K Prisciandaro, J Taliercio, A Teklishyn, M Mackay, CK Vischia, P Wertz, S Wuyckens, S Kyberd, P Alves, GA Hensel, C Khan, A Moraes, A Cole, JE Coldham, K Lechner, L Liko, D Mikulec, I Pitters, FM Schieck, J Schöfbeck, R Spanring, M Templ, S Waltenberger, W Wulz, CE Chekhovsky, V Litomin, A Makarenko, V Darwish, MR De Wolf, EA Janssen, X Kello, T Lelek, A Rejeb Sfar, H Van Mechelen, P Van Putte, S Van Remortel, N Blekman, F Bols, ES D'Hondt, J De Clercq, J Delcourt, M Lowette, S Moortgat, S Morton, A Müller, D Sahasransu, AR Tavernier, S Van Doninck, W Van Mulders, P Beghin, D Bilin, B Clerbaux, B De Lentdecker, G Favart, L Grebenyuk, A Kalsi, AK Lee, K Mahdavikhorrami, M Makarenko, I Moureaux, L Pétré, L Popov, A Postiau, N Starling, E Thomas, L Vanden Bemden, M Vander Velde, C Vanlaer, P Vannerom, D Wezenbeek, L Cornelis, T Dobur, D Gruchala, M Lambrecht, L Mestdach, G Niedziela, M Roskas, C Skovpen, K Tran, TT Tytgat, M Verbeke, W Vermassen, B Zahid, S Vit, M |
Keywords: | bottom baryons;hadron colliders |
Issue Date: | 25-Jun-2021 |
Publisher: | American Physical Society |
Citation: | Sirunyan, A.M. et al. (CMS Collaboration) (2021) 'Observation of a New Excited Beauty Strange Baryon Decaying to Ξb- π+π-', Physical Review Letters, 126 (25), 252003 pp. 1 - 19. doi: 10.1103/PhysRevLett.126.252003. |
Abstract: | © 2021 CERN, for the CMS Collaboration. The Ξb-π+π- invariant mass spectrum is investigated with an event sample of proton-proton collisions at s=13 TeV, collected by the CMS experiment at the LHC in 2016-2018 and corresponding to an integrated luminosity of 140 fb-1. The ground state Ξb- is reconstructed via its decays to J/ψΞ- and J/ψΛK-. A narrow resonance, labeled Ξb(6100)-, is observed at a Ξb-π+π- invariant mass of 6100.3±0.2(stat)±0.1(syst)±0.6(Ξb-) MeV, where the last uncertainty reflects the precision of the Ξb- baryon mass. The upper limit on the Ξb(6100)- natural width is determined to be 1.9 MeV at 95% confidence level. The low Ξb(6100)- signal yield observed in data does not allow a measurement of the quantum numbers of the new state. However, following analogies with the established excited Ξc baryon states, the new Ξb(6100)- resonance and its decay sequence are consistent with the orbitally excited Ξb- baryon, with spin and parity quantum numbers JP=3/2-. |
URI: | https://bura.brunel.ac.uk/handle/2438/22999 |
DOI: | https://doi.org/10.1103/PhysRevLett.126.252003 |
ISSN: | 0031-9007 |
Other Identifiers: | 252003 |
Appears in Collections: | Dept of Electronic and Electrical Engineering Research Papers |
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