@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="Evidence of a J / $\psi$K0S Structure in B0 {\textrightarrow} J / $\psi$$\phi$K0S Decays",
journal="Physical Review Letters",
year="2023",
publisher="Amer Physical Soc",
volume="131",
number="13",
pages="131901 - 11pp",
abstract="An amplitude analysis of B0 -> J=psi phi K0S decays is performed using proton-proton collision data, corresponding to an integrated luminosity of 9 fb-1, collected with the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV. Evidence with a significance of 4.0 standard deviations of a structure in the J=psi K0S system, named T theta psi s1o4000 thorn 0, is seen, with its mass and width measured to be 3991 thorn 12 thorn 9 -10 -17 MeV=c2 and 105 thorn 29 thorn 17 -25 -23 MeV, respectively, where the first uncertainty is statistical and the second systematic. The T theta psi s1 o4000 thorn 0 state is likely to be the isospin partner of the T theta psi s1 o4000 thorn thorn state, previously observed in the J=psi K thorn system of the B thorn -> J=psi phi K thorn decay. When isospin symmetry for the charged and neutral T theta psi s1 o4000 thorn states is assumed, the signal significance increases to 5.4 standard deviations.",
optnote="WOS:001102953400002",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=5951), last updated on Wed, 10 Apr 2024 12:45:24 +0000",
issn="0031-9007",
doi="10.1103/PhysRevLett.131.131901",
opturl="https://arxiv.org/abs/2301.04899",
opturl="https://doi.org/10.1103/PhysRevLett.131.131901",
language="English"
}