Analysis of the mass and width of the X(4140) as axialvector tetraquark state

• Published in: The European physical journal. C, Particles and fields Vol. 79; no. 1; pp. 1 - 10
• Main Authors: Wang, Zhi-Gang, Di, Zun-Yan
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 2019; Springer; Springer Nature B.V; SpringerOpen
• Subjects: Analysis; Astronomy; Astrophysics and Cosmology; Elementary Particles; Hadrons; Heavy Ions; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Physics; Physics and Astronomy; Quantum chromodynamics; Quantum Field Theories; Quantum Field Theory; Quarks; Regular Article - Theoretical Physics; String Theory; Sum rules
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-019-6596-8

In this article, we construct both the [ s c ] T [ s ¯ c ¯ ] A + [ s c ] A [ s ¯ c ¯ ] T type and [ s c ] T [ s ¯ c ¯ ] V - [ s c ] V [ s ¯ c ¯ ] T type axialvector currents with J PC = 1 + + to study the mass of the X (4140) with the QCD sum rules. The predicted masses support assigning the X (4140) to be the [ s c ] T [ s ¯ c ¯ ] V - [ s c ] V [ s ¯ c ¯ ] T type axialvector tetraquark state. Then we study the hadronic coupling constant g X J / ψ ϕ with the QCD sum rules based on solid quark-hadron duality, and obtain the decay width Γ ( X ( 4140 ) → J / ψ ϕ ) = 86.9 ± 22.6 MeV , which is in excellent agreement with the experimental data 83 ± 21 - 14 + 21 MeV from the LHCb collaboration.