A possible interpretation for $X(6900)$ observed in four-muon final state by LHCb -- A light Higgs-like boson?

Abstract

A peak structure of $J/\psi$ pair production around $6.9\mathrm{GeV}$ was observed and analyzed by the LHCb collaboration using the Run I and II data of LHC. How to understand this peak arouses enthusiastic discussions among both theorists and experimentalists of high energy physics, because this discovery might hint something new. Overwhelming works on this topic tend to attribute the peak as a four-quark state: tetraquark or molecule. Instead, we suggest that this peak is corresponding to a fundamental Higgs-like boson with mass about $6.9\mathrm{GeV}$ which is advocated by a BSM effective theory. We present a detailed analysis on both signal and SM background, including integrated cross sections and invariant mass distributions of the final-state $J/\psi$ pair. Our numerical results are well in coincidence with the experimental data, as postulating the resonance observed by LHCb to be a BSM $0^{++}$ scalar. Therefore, the peak at $M_{\text{di-}J/\psi }\sim 6.9\mathrm{GeV}$ might be a hint of new physics beyond the SM whose scale is not as large as mostly expected by high energy physicists. More further works are urgently needed in both experimental and theoretical aspects to validate or negate this assumption.

arXiv comment5 figures

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Cited by in corpus (14)

• An updated review of the new hadron states
• Tetraquark state $X(6900)$ and the interaction between diquark and antidiquark
• Higher mass spectra of the fully-charmed and fully-bottom tetraquarks
• Mass spectra and wave functions of $T_{QQ\bar{Q}\bar{Q}}$ tetraquarks
• Higher fully-charmed tetraquarks: Radial excitations and P-wave states
• Is $X(7200)$ the heavy anti-quark diquark symmetry partner of $X(3872)$?
• Exotic fully-heavy $Q\bar{Q}Q\bar{Q}$ tetraquark states in $8_{[Q\bar{Q}]}\otimes 8_{[Q\bar{Q}]}$ color configuration
• Fully-heavy structures in the invariant mass spectrum of $J/\psi \psi (3686)$, $J/\psi \psi (3770)$, $\psi (3686)\psi (3686)$, and $J/\psi {\rm Y}(1S)$ at hadron colliders
• Decay behaviors of the fully-bottom and fully-charm tetraquark states
• Inclusive production of fully-charmed $1^{+-}$ tetraquark at $\mathbf{B}$ factory
• Pseudoscalar charmonium pair interactions via the Pomeron exchange mechanism
• Mass spectra for the $cc\bar{b}\bar{b}$/$bb\bar{c}\bar{c}$ tetraquark states
• Searching for fully-heavy tetraquark states in QCD moment sum rules
• All Heavy Tetraquarks: The Dynamical Diquark Model and Other Approaches