Observation of a New Excited Beauty Strange Baryon Decaying to Ξb- π+π-

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

Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/22999

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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