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  - Observation of New Resonances Decaying to J=Psi K plus and J=Psi phi
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 082001
EP  - 11pp
VL  - 127
IS  - 8
PB  - Amer Physical Soc
AB  - 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.
SN  - 0031-9007
UR  - https://arxiv.org/abs/2103.01803
UR  - https://doi.org/10.1103/PhysRevLett.127.082001
DO  - 10.1103/PhysRevLett.127.082001
LA  - English
N1  - WOS:000686914400004
ID  - LHCbCollaborationAaij_etal2021
ER  -