TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Henry, L.
AU  - Jashal, B. K.
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Remon Alepuz, C.
AU  - Ruiz Vidal, J.
PY  - 2021
DA  - 2021//
TI  - Evidence of a J/psi Lambda structure and observation of excited Xi(-) states in the Xi(-)(b) -> J/psi Lambda K- decay
T2  - Sci. Bull.
JO  - Science Bulletin
SP  - 1278
EP  - 1287
VL  - 66
IS  - 13
PB  - Elsevier
KW  - QCD
KW  - Exotics
KW  - Pentaquark
KW  - Spectroscopy
KW  - Quarkonium
KW  - Particle and resonance production
AB  - 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.
SN  - 2095-9273
UR  - https://arxiv.org/abs/2012.10380
UR  - https://doi.org/10.1016/j.scib.2021.02.030
DO  - 10.1016/j.scib.2021.02.030
LA  - English
N1  - WOS:000668689800009
ID  - LHCbCollaborationAaij_etal2021
ER  -