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  4. Observation of a Vector Charmoniumlike State at 4.7 GeV/c2 and Search for Zcs in e+e- → K+ K- J/ψ
 
research article

Observation of a Vector Charmoniumlike State at 4.7 GeV/c2 and Search for Zcs in e+e- → K+ K- J/ψ

Ablikim, M.
•
Achasov, M. N.
•
Adlarson, P.
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November 22, 2023
Physical Review Letters

Using data samples with an integrated luminosity of 5.85 fb(-1) collected at center-of-mass energies from 4.61 to 4.95 GeV with the BESIII detector operating at the BEPCII storage ring, we measure the cross section for the process e(+)e(-) -> K+ K- J/psi. A new resonance with a mass of M = 4708(-15)(+17) +/- 21 MeV/c(2) and a width of Gamma = 126(-23)(+27) +/-+/- 30 MeV is observed in the energy-dependent line shape of the e(+)e(-) -> K+ K- J/psi. cross section with a significance over 5 sigma. The K(+)J/psi system is also investigated to search for charged charmoniumlike states, but no significant Z(cs)(+) states are observed. Upper limits on the Born cross sections for e+e- -> K-Z(cs)(3985)(+)/K-Z(cs)(4000)(+) + c:c: with Z(cs)(3985)(+/-)/Z(cs)(4000)(+/-) -> K(+/-)J/psi are reported at 90% confidence levels. The ratio of branching fractions {[B(Z(cs)(3985)(+) -> K+J/psi)]/B[Z(cs)(3985)(+) -> ((D) over bar D-0(s)(+) + (D) over barD-0(s)+)]} is measured to be less than 0.03 at 90% confidence level.

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Type
research article
DOI
10.1103/PhysRevLett.131.211902
Web of Science ID

WOS:001178894000001

Author(s)
Ablikim, M.
Achasov, M. N.
Adlarson, P.
Afedulidis, O.
Ai, X. C.
Aliberti, R.
Amoroso, A.
An, Q.
Bai, Y.
Bakina, O.
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Corporate authors
BESIII Collaboration
Date Issued

2023-11-22

Published in
Physical Review Letters
Volume

131

Issue

21

Article Number

211902

Subjects

Physical Sciences

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPHE  
FunderGrant Number

IHEP computing center

National Key R&D Program of China

2020YFA0406300

National Natural Science Foundation of China (NSFC)

11635010

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Available on Infoscience
April 3, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/206868
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