@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="Observation of New Resonances Decaying to J=Psi K plus and J=Psi phi",
journal="Physical Review Letters",
year="2021",
publisher="Amer Physical Soc",
volume="127",
number="8",
pages="082001--11pp",
abstract="The first observation of exotic states with a new quark content ccus decaying to the J/Psi K+ final state is reported with high significance from an amplitude analysis of the B+-> J/ Psi phi K+ decay. The analysis is carried out using proton-proton collision data corresponding to a total integrated luminosity of 9 fb- 1 collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. The most significant state, Z(cs)(4000)+, has a mass of 4003 +/- 6 (-14) (+4) MeV, a width of 131 +/- 15 +/- 26 MeV, and spin parity J(P) = 1(+), where the quoted uncertainties are statistical and systematic, respectively. A new 1(+) X(4685) state decaying to the J/Psi phi final state is also observed with high significance. In addition, the four previously reported J/Psi phi states are confirmed and two more exotic states, Z(cs) (4220) (+) and X(4630), are observed with significance exceeding 5 standard deviations.",
optnote="WOS:000686914400004",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4940), last updated on Wed, 08 Sep 2021 16:56:14 +0000",
issn="0031-9007",
doi="10.1103/PhysRevLett.127.082001",
opturl="https://arxiv.org/abs/2103.01803",
opturl="https://doi.org/10.1103/PhysRevLett.127.082001",
language="English"
}