@Article{LHCbCollaborationAaij_etal2023,
author="LHCb Collaboration (Aaij, R. et al
and Jaimes Elles, S. J.
and Jashal, B. K.
and Martinez-Vidal, F.
and Oyanguren, A.
and Rebollo De Miguel, M.
and Remon Alepuz, C.
and Ruiz Vidal, J.
and Sanderswood, I.",
title="Observation of a J/$\psi$$\Lambda$ Resonance Consistent with a Strange Pentaquark Candidate in B- {\textrightarrow} J/$\psi$$\Lambda$(p)over-bar Decays",
journal="Physical Review Letters",
year="2023",
publisher="Amer Physical Soc",
volume="131",
number="3",
pages="031901--11pp",
abstract="An amplitude analysis of B- -> J/psi Lambda(p) over bar decays is performed using 4400 signal candidates selected on a data sample of pp collisions recorded at center-of-mass energies of 7, 8, and 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 9 fb(-1). A narrow resonance in the J/psi Lambda system, consistent with a pentaquark candidate with strangeness, is observed with high significance. The mass and the width of this new state are measured to be 4338.2 +/- 0.7 +/- 0.4 MeV and 7.0 +/- 1.2 +/- 1.3 MeV, where the first uncertainty is statistical and the second systematic. The spin is determined to be 1/2 and negative parity is preferred. Because of the small Q-value of the reaction, the most precise single measurement of the B- mass to date, 5279.44 +/- 0.05 +/- 0.07 MeV, is obtained.",
optnote="WOS:001138758100002",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=5941), last updated on Wed, 10 Apr 2024 12:45:08 +0000",
issn="0031-9007",
doi="10.1103/PhysRevLett.131.031901",
opturl="https://arxiv.org/abs/2210.10346",
opturl="https://doi.org/10.1103/PhysRevLett.131.031901",
language="English"
}