Fully-heavy tetraquark states and their evidences in the LHC observations

2020/06/22 by Ming-Sheng liu, Feng-Xiao Liu, liu, Ming-Sheng +4 · 5 citations
Physics and Astronomy · #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Black Holes and Theoretical Physics

paper · pdf · doi:10.48550/arxiv.2006.11952

Abstract

Stimulated by the exciting progress on the observations of the fully-charmed tetraquarks at LHC, we carry out a combined analysis of the mass spectra and fall-apart decays of the 1S-, 2S-, and 1P-wave cccc states in a nonrelativistic quark model (NRQM). It is found that the X(6600) structure observed in the di-J/ψ invariant mass spectrum can be explained by the 1S-wave state T_(4c)0⁺⁺(6550). This structure may also bear some feed-down effects from the higher 2S and/or 1P tetraquark states. The X(6900) structure observed in both the di-J/ψ and J/ψψ(2S) channels can be naturally explained by the 2S-wave state T_(4c)0⁺⁺(6957). The small shoulder structure around 6.2-6.4 GeV observed at CMS and ATLAS may be due to the feed-down effects from some 1P-wave states with C=-1 and/or some 2S-wave states with J^PC=0⁺⁺. Other decay channels are implied in such a scenario and they can be investigated by future experimental analyses. Considering the large discovery potential at LHC, we also present predictions for the bbbb states which can be searched for in the future.

Citations

• Hadronic molecules

Cited by

• Singly heavy tetraquarks
• Systematic investigation of the spectroscopy and decay behaviors of doubly-charmed pentaquarks
• Symmetry Analysis of Compact Tetraquark States and Implications for the Level Ordering of the Fully Charmed Candidates X(6600), X(6900), and X(7100)
• Deciphering the nature of X(2300) with the PACIAE model
• Fully heavy tetraquark states with diquark-antidiquark configuration

Related

• Structure of cc c c tetraquarks and interpretation of LHC states
• Fully heavy tetraquark states with diquark-antidiquark configuration
• Potential model prediction of fully-heavy tetraquarks QQQQ (Q=c, b)
• Spectroscopy and decays of the fully-heavy tetraquarks
• Mass Spectra of Full-Heavy and Double-Heavy Tetraquark States in the Conventional Quark Model