How to understand the $X(2900)$?

Abstract

In this work, the $S$- and $P$-wave ${\bar{D}}^{\ast }{K}^{\ast }$ interactions are studied in a coupled-channel formalism to understand the recently observed $X_0(2900)$ and $X_1(2900)$ at LHCb. The experimental event distributions can be well described, and two states with $I(J^P)=0(0^{+})$ and $0(1^{-})$ are yielded in an unified framework. The masses of the $0^{+}$ and $1^{-}$ states are consistent with the experimental data, but the width of the $0^{+}$ state is larger than that of the $1^{-}$ one. The $X_1(2900)$ can be interpreted as the $P$-wave excitation of the ground-state $X_0(2900)$ in the hadronic molecular picture. The $S$- and $P$-wave multiplets in the ${\bar{D}}^{\ast }{K}^{\ast }$ system have many members, so the present peak in the $D^{-}{K}^{+}$ invariant mass distributions might contain multi subpeaks. In order to probe the fine structures behind the single whole peak now, more refined measurements in the $B^{+}\to D^{+}{D}^{-}{K}^{+}$ decay channel are necessary.

8 pages, 4 figures

References in corpus (12)

• Chiral effective field theory and nuclear forces
• Multiquark Resonances
• Pentaquark and Tetraquark states
• Pion Interactions in the X(3872)
• Interpretation of the LHCb $P_c$ States as Hadronic Molecules and Hints of a Narrow $P_c(4380)$
• Hidden-charm and hidden-bottom molecular pentaquarks in chiral perturbation theory
• Light Pseudoscalar Meson and Heavy Meson Scattering Lengths
• ${\bar{B}}^{(\ast )}{\bar{B}}^{(\ast )}$ interactions in chiral effective field theory
• Galilean-Invariant XEFT
• Spin partners $W_{bJ}$ from the line shapes of the $Z_b(10610)$ and $Z_b(10650)$
• Spectrum of the doubly charmed molecular pentaquarks in chiral effective field theory
• X_1(2900) as a D_1 K molecule

Cited by in corpus (7)

• An updated review of the new hadron states
• Chiral perturbation theory for heavy hadrons and chiral effective field theory for heavy hadronic molecules
• The $T_{c\bar{s}}(2900)$ as a threshold effect from the interaction of the $D^{\ast }{K}^{\ast }$, $D_s^{\ast }\rho$ channels
• Heavy Flavour Physics and CP Violation at LHCb: a Ten-Year Review
• Charmed-strange tetraquarks and their decays in a potential quark model
• Modeling the resonance $T_{cs0}^a(2900{)}^{++}$ as a hadronic molecule $D^{\ast +}{K}^{\ast +}$
• Molecular states of $D^{\ast }{D}^{\ast }{\bar{K}}^{\ast }$ nature