Recent Results in Bottomonium

Abstract

Great strides have been made in the understanding of bound states of a bottom quark $b$ and its antiquark $\bar{b}$ since the discovery of the first ${\rm Y}$ resonances in 1977. These {\it bottomonium} bound states have a rich spectrum whose masses and transition amplitudes shed valuable light on the strong interactions. The present article reviews some recent developments in bottomonium physics. These include the discovery of the spin-singlet states ${\eta }_b$ and $h_b$, the first D-wave states, one or more candidates for spin-triplet ${\chi }_b(3P)$ excitations, and above-threshold states with strong transitions to states below threshold. Information on transitions, production, and signatures of new physics is also presented.

47 pages, 2 figures, to be submitted to Annual Review of Nuclear and Particle Science

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• Bottomonium Mesons and Strategies for Their Observation
• Modern and Future Colliders
• Interpretation of the X(3872) as a charmonium state plus an extra component due to the coupling to the meson-meson continuum
• Higher mass bottomonia
• Status of quarkonia - like negative and positive parity states in a relativistic confinement scheme
• Quarkonium propagation in the quark gluon plasma
• Study of ${\rm Y}(nS)$ $\to$ $B_{c}P$ decays with perturbative QCD approach
• Instanton effects on the heavy-quark static potential
• Self-consistent $M1$ radiative transitions of excited $B_c$ and heavy quarkonia with different polarizations in the light-front quark model
• Review of bottomonium measurements from CMS
• Bottomonium spectroscopy in the quark-gluon plasma
• Revisiting radiative decays of $1^{+-}$ heavy quarkonia in the covariant light-front approach
• Study on ${\rm Y}(nS)$ $\to$ $B_{c}M$ decays
• Complete analytical solution to the Cornell potential and heavy quarkonium structure
• ${\rm Y}(nS)$ $\to$ $B_c^{\ast }D$ decays with perturbative QCD approach
• ${\rm Y}(nS)$ $\to$ $B_c\rho$, $B_c{K}^{\ast }$ decays with perturbative QCD approach
• Study on the ${\rm Y}(1S)$ $\to$ $B_{c}M$ weak decays
• Study on the ${\rm Y}(1S)$ $\to$ $B_c{D}_s$ decay
• Melting of heavy quarkonia in QGP using deep neural networks
• The ${\rm Y}(nS)$ $\to$ $B_c{D}_s$, $B_c{D}_d$ decays with perturbative QCD approach