Qiang Mao’s research while affiliated with Suzhou Vocational University and other places

We study the Ξb(6100) using the methods of QCD sum rules and light-cone sum rules within the framework of heavy quark effective theory. Our results suggest that the Ξb(6100) can be well interpreted as the P-wave bottom baryon of JP=3/2−, belonging to the SU(3) flavor 3¯F representation. It has a partner state of JP=1/2−, labeled as Ξb(1/2−), whose mass and width are predicted to be mΞb(1/2−)=6.08−0.11+0.13 GeV and ΓΞb(1/2−)=4−4+29 MeV, respectively, with the mass splitting ΔM=mΞb(6100)−mΞb(1/2−)=9±3 MeV. We propose to search for it in the Ξc(1/2−)→Ξb′π decay channel. Our results also suggest that the Λb(5912) and Λb(5920) are their partner states with JP=1/2− and 3/2−, respectively, and, moreover, the Λc(2595), Λc(2625), Ξc(2790), and Ξc(2815) are their charmed partner states.

We study the $\Xi_b(6100)$ using the methods of QCD sum rules and light-cone sum rules within the framework of heavy quark effective theory. Our results suggest that the $\Xi_b(6100)$ can be well interpreted as the P-wave bottom baryon of $J^P=3/2^-$, belonging to the SU(3) flavor $\mathbf{\bar 3}_F$ representation. It has a partner state of $J^P=1/2^-$, labelled as $\Xi_b(1/2^-)$, whose mass and width are predicted to be $m_{\Xi_b(1/2^-)}=6.08^{+0.13}_{-0.11}$~GeV and $\Gamma_{\Xi_b(1/2^-)}=4^{+29}_{-~4}$~MeV, with the mass splitting $\Delta M=m_{\Xi_b(6100)}-m_{\Xi_b(1/2^-)}=9\pm3$~MeV. We propose to search for it in the $\Xi_c({1/2}^-)\to \Xi_b^{\prime}\pi$ decay channel. Our results also suggest that the $\Lambda_b(5912)$ and $\Lambda_b(5920)$ are their partner states with $J^P=1/2^-$ and $3/2^-$ respectively, and moreover, the $\Lambda_c(2595)$, $\Lambda_c(2625)$, $\Xi_c(2790)$, and $\Xi_c(2815)$ are their charmed partner states.

We systematically study mass spectra and decay properties of P-wave Ξc′ baryons of the SU(3) flavor 6F, using the methods of QCD sum rules and light-cone sum rules within the framework of heavy quark effective theory. Our results suggest that the three excited Ξc0 baryons recently observed by LHCb can be well explained as P-wave Ξc′ baryons: the Ξc(2923)0 and Ξc(2939)0 are partner states of JP=1/2− and 3/2−, respectively, both of which contain one λ-mode orbital excitation; the Ξc(2965)0 has JP=3/2− and also contains one λ-mode orbital excitation. We propose to search for another P-wave Ξc′ state of JP=5/2− in the ΛcK/Ξcπ mass spectral in future experiments. Its mass is about 56−35+30 MeV larger than the Ξc(2965)0, and its width is about 18.1−8.3+19.7 MeV.

We study the Λ b ( 6146 ) 0 and Λ b ( 6152 ) 0 recently observed by LHCb using the method of Quantum Chromodynamics (QCD) sum rules within the framework of heavy quark effective theory. Our results suggest that they can be interpreted as D-wave bottom baryons of J P = 3 / 2 + and 5 / 2 + respectively, both of which contain two λ -mode excitations. We also investigate other possible assignments containing ρ -mode excitations. We extract all the parameters that are necessary to study their decay properties when using the method of light-cone sum rules. We predict masses of their strangeness partners to be m Ξ b ( 3 / 2 + ) = 6.26 − 0.14 + 0.11 GeV and m Ξ b ( 5 / 2 + ) = 6.26 − 0.14 + 0.11 GeV with the mass splitting Δ M = m Ξ b ( 5 / 2 + ) − m Ξ b ( 3 / 2 + ) = 4.5 − 1.5 + 1.9 MeV, and propose to search for them in future CMS, EIC, and LHCb experiments.

We systematically study mass spectra and decay properties of P-wave $\Xi_c^\prime$ baryons of the SU(3) flavor $\mathbf{6}_F$, using the methods of QCD sum rules and light-cone sum rules within the framework of heavy quark effective theory. Our results suggest that the three excited $\Xi_c^0$ baryons recently observed by LHCb can be well explained as P-wave $\Xi_c^\prime$ baryons: the $\Xi_c(2923)^0$ and $\Xi_c(2939)^0$ are partner states of $J^P = 1/2^-$ and $3/2^-$ respectively, both of which contain one $\lambda$-mode orbital excitation; the $\Xi_c(2965)^0$ has $J^P = 3/2^-$, and also contains one $\lambda$-mode orbital excitation. More partner states and more decay channels are extracted (summarized in Table II) for future experimental searchings.

The heavy baryon system bounded by the strong interaction has a rich internal structure, so its mass spectra can have the fine structure similar to the line spectra of atom bounded by the electromagnetic interaction. We systematically study the internal structure of P-wave $\varOmega _b$ baryons and calculate their D-wave decay properties. The present study, together with our previous studies on their mass spectra and S-wave decay properties, suggest that all the four excited $\varOmega _b$ baryons recently discovered by LHCb can be well explained as P-wave $\varOmega _b$ baryons, and their beautiful fine structure is directly related to the rich internal structure of P-wave $\varOmega _b$ baryons.

We study the $\Lambda_b(6146)^0$ and $\Lambda_b(6152)^0$ recently observed by LHCb using the method of QCD sum rules within the framework of heavy quark effective theory. Our results suggest that they can be interpreted as D-wave bottom baryons of $J^P = 3/2^+$ and $5/2^+$ respectively, both of which contain two $\lambda$-mode excitations. We also investigate other possible assignments containing $\rho$-mode excitations. We predict masses of their strangeness partners to be $m_{\Xi_b(3/2^+)} = 6.26^{+0.11}_{-0.14}$ GeV and $m_{\Xi_b(5/2^+)} = 6.26^{+0.11}_{-0.14}$ GeV with the mass splitting $\Delta M = 4.5^{+1.9}_{-1.5}$ MeV, and propose to search for them in future LHCb and CMS experiments.

We use the method of light-cone sum rules to study decay properties of P-wave bottom baryons belonging to the SU(3) flavor $\mathbf {6}_F$ representation. In Cui et al. (Phys Rev D 99:094021, 2019) we have studied their mass spectrum and pionic decays, and found that the $\varSigma _{b}(6097)$ and $\varXi _{b}(6227)$ can be well interpreted as P-wave bottom baryons of $J^P = 3/2^-$. In this paper we further study their decays into ground-state bottom baryons and vector mesons. We propose to search for a new state $\varXi _b({5/2}^-)$, that is the $J^P = 5/2^-$ partner state of the $\varXi _{b}(6227)$, in the $\varXi _b({5/2}^-) \rightarrow \varXi _b^{*}\rho \rightarrow \varXi _b^{*}\pi \pi$ decay process. Its mass is $12 \pm 5$ MeV larger than that of the $\varXi _{b}(6227)$.A preprint version of the article is available at ArXiv.

The heavy baryon system bounded by the strong interaction has a rich internal structure, so its mass spectra can have the fine structure similar to the line spectra of atom bounded by the electromagnetic interaction. We systematically study the internal structure of P-wave $\Omega_b$ baryons, and calculate their mass spectra and strong decay properties. Our results suggest that all the four excited $\Omega_b$ baryons recently discovered by LHCb can be well explained as P-wave $\Omega_b$ baryons, and their beautiful fine structure is directly related to the rich internal structure of P-wave $\Omega_b$ baryons.

We use the method of light-cone sum rules to study S-wave decays of the SU(3) flavor $\mathbf{6}_F$ P-wave heavy baryons into ground-state heavy baryons accompanied by vector mesons $\rho$ and $K^*$. In [Phys. Rev. D 99, 094021 (2019)] we have studied their mass spectrum and pionic decays, and found that the $\Sigma_{b}(6097)^{\pm}$ and $\Xi_{b}(6227)^{-}$ can be well interpreted as P-wave bottom baryons of $J^P = 3/2^-$. In this paper we further studied their decays accompanied by vector mesons, and we propose to search for a new state $\Xi_b({5/2}^-)$, that is the $J^P = 5/2^-$ partner state of the $\Xi_{b}(6227)^{-}$, in the $\Xi_b({5/2}^-) \to \Xi_b^{*}({3/2}^+)\rho \to \Xi_b^{*}({3/2}^+)\pi\pi$ decay, whose width is extracted to be $5.1{^{+5.6}_{-4.0}}$~keV.