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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-.
ISSN: 0031-9007
Other Identifiers: 252003
Appears in Collections:Dept of Electronic and Computer Engineering Research Papers

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