[Formula: see text] excited states within a [Formula: see text] HQSS model

Area of Science:

• Particle Physics
• Quantum Chromodynamics
• Hadron Spectroscopy

Background:

• Recent observation of five new heavy quark spin symmetry (HQSS) states by the LHCb Collaboration.
• Need to interpret these states within theoretical frameworks like coupled-channel models.

Purpose of the Study:

• To review the renormalization procedure in the unitarized coupled-channel model of Romanets et al.
• To investigate the impact of this model on the [Formula: see text], [Formula: see text], and [Formula: see text] sector, particularly concerning the newly observed LHCb states.

Main Methods:

• Analysis of meson-baryon interactions consistent with chiral and heavy-quark spin symmetries.
• Application of a unitarized coupled-channel model to describe low-lying odd parity resonances.
• Comparison of model predictions with experimental data from the LHCb Collaboration.

Main Results:

• The model successfully describes previously observed odd parity resonances like [Formula: see text] and [Formula: see text].
• It is predicted that at least three of the five new LHCb states will have odd parity and [Formula: see text] or [Formula: see text] quantum numbers.
• Two of these predicted states are expected to belong to the same [Formula: see text] HQSS multiplets as known charmed and beauty [Formula: see text] baryons.

Conclusions:

• The unitarized coupled-channel model provides a consistent framework for understanding heavy quark spin symmetry.
• The findings suggest a significant overlap between theoretical predictions and experimental observations of new heavy mesons.
• Further investigation into the properties of the newly observed LHCb states is warranted to confirm their parity and quantum numbers.