@Article{LHCbCollaborationAaij_etal2021,
author="LHCb Collaboration (Aaij, R. et al
and Henry, L.
and Jashal, B. K.
and Martinez-Vidal, F.
and Oyanguren, A.
and Remon Alepuz, C.
and Ruiz Vidal, J.",
title="Evidence of a J/psi Lambda structure and observation of excited Xi(-) states in the Xi(-)(b) -> J/psi Lambda K- decay",
journal="Science Bulletin",
year="2021",
publisher="Elsevier",
volume="66",
number="13",
pages="1278--1287",
optkeywords="QCD; Exotics; Pentaquark; Spectroscopy; Quarkonium; Particle and resonance production",
abstract="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.",
optnote="WOS:000668689800009",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4888), last updated on Mon, 19 Jul 2021 07:00:24 +0000",
issn="2095-9273",
doi="10.1016/j.scib.2021.02.030",
opturl="https://arxiv.org/abs/2012.10380",
opturl="https://doi.org/10.1016/j.scib.2021.02.030",
language="English"
}