Lattice spectroscopy with focus on exotics

Abstract

Recent lattice QCD results on the hadron spectroscopy with beauty and charm quarks is reviewed. The focus of the review are exotic hadrons, while non-lattice approaches and conventional hadrons are reported as well. We discuss the recently discovered ${\Omega }_c^{\ast }$, a charmonium state with spin three, $P_c$ pentaquarks, $B_c(2S)$ and ${\Lambda }_b^{\ast }$, the long-standing challenges for theory $Z_c$, $Z_b$ and $X(3872)$, and we review predictions for yet undiscovered states $bb\bar{q}\bar{q}$, $\bar{b}b\bar{b}b$, highly excited and hybrid $\bar{b}b$, baryons with bottom quarks and still-missing $B_s$ mesons.

12 pages, invited review talk at Beauty 2019, Ljubljana, Slovenia, minor corrections and modified discussion on charmed mesons in Section 6

References in corpus (11)

• Multiquark Resonances
• Observation of a narrow pentaquark state, $P_c(4312{)}^{+}$, and of two-peak structure of the $P_c(4450{)}^{+}$
• Exotics: Heavy Pentaquarks and Tetraquarks
• Observation of the doubly charmed baryon ${\Xi }_{cc}^{++}$
• Ab initio calculation of the neutron-proton mass difference
• Prediction of narrow $N^{\ast }$ and ${\Lambda }^{\ast }$ resonances with hidden charm above 4 GeV
• Discovery of doubly-charmed Xi_{cc} baryon implies a stable (b b ubar dbar) tetraquark
• Heavy-quark symmetry implies stable heavy tetraquark mesons $Q_i{Q}_j{\bar{q}}_k{\bar{q}}_l$
• Masses and decay constants of the $D_{s0}^{\ast }(2317)$ and $D_{s1}(2460)$ from $N_f=2$ lattice QCD close to the physical point
• Observation of two excited B${}_{\mathrm{c}}^{+}$ states and measurement of the B${}_{\mathrm{c}}^{+}$(2S) mass in pp collisions at $\sqrt{s}=$ 13 TeV
• Observation of an excited $B_c^{+}$ state