%0 Journal Article
%T Evidence of a J/psi Lambda structure and observation of excited Xi(-) states in the Xi(-)(b) -> J/psi Lambda K- decay
%A LHCb Collaboration (Aaij, R. et al
%A Henry, L.
%A Jashal, B. K.
%A Martinez-Vidal, F.
%A Oyanguren, A.
%A Remon Alepuz, C.
%A Ruiz Vidal, J.
%J Science Bulletin
%D 2021
%V 66
%N 13
%I Elsevier
%@ 2095-9273
%G English
%F LHCbCollaborationAaij_etal2021
%O WOS:000668689800009
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4888), last updated on Mon, 19 Jul 2021 07:00:24 +0000
%X First evidence of a structure in the J/psi Lambda invariant mass distribution is obtained from an amplitude analysis of Xi(-)(b) -> J/psi Lambda K- decays. The observed structure is consistent with being due to a charmonium pentaquark with strangeness with a significance of 3.1r including systematic uncertainties and lookelsewhere effect. Its mass and width are determined to be 4458.8 +/- 2.9(-1.1)(+4.7) MeV and 17.3 +/- 6.5(-5.7)(+8.0) MeV, respectively, where the quoted uncertainties are statistical and systematic. The structure is also consistent with being due to two resonances. In addition, the narrow excited Xi(-) states, Xi(-)(1690) and Xi(-)(1820)(-), are seen for the first time in a Xi(-)(b) decay, and their masses and widths are measured with improved precision. The analysis is performed using pp collision data corresponding to a total integrated luminosity of 9 fb(-1), collected with the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV.
%K QCD
%K Exotics
%K Pentaquark
%K Spectroscopy
%K Quarkonium
%K Particle and resonance production
%R 10.1016/j.scib.2021.02.030
%U https://arxiv.org/abs/2012.10380
%U https://doi.org/10.1016/j.scib.2021.02.030
%P 1278-1287