Magnetic moment of the $X_1(2900)$ state in the diquark-antidiquark picture

Abstract

Motivated by the discovery of fully open-flavor tetraquark states X0(2900) and X1(2900) by the LHCb Collaboration, the magnetic dipole moment of the X1(2900) state with the quantum numbers J P = 1 − is determined in the diquark-antidiquark model using the light-cone sum rules. The magnetic moments of hadrons encompasses useful knowledge on the distributions of charge and magnetization their inside, which can be used to better understand their geometrical shapes and quark-gluon organizations. The observation of the X0(2900) and X1( 2900) as the first two fully open-flavor multiquark states has opened a new window for investigation of the exotic states. The obtained results in the present study may shed light on the future experimental and theoretical searches on the properties of fully open-flavor multiquark states.

An updated review of the new hadron states

“…The magnetic moment of the X 1 (2900) was calculated in Ref. [429] to be µ X 1 (2900) = 0.79 +0.36 −0.39 µ N using the QCD sum rule method within the diquark-antidiquark picture.…”

Spectroscopy behavior of fully heavy tetraquarks

“…In 2016, D0 Collaboration reported a narrow structure X(5568) in the B 0 s π ± invariant mass spectrum with 5.1σ significance [28]. In 2020, LHCb collaboration reported the discovery of two new exotic structures X 0 (2900) and X 1 (2900) [29,30], which reignites the study of exotic charmed mesons [31][32][33][34][35][36][37][38][39][40].…”