Hugo Garcia Tecocoatzi

We analyze the radiative decays of the 1 P , 1 D , 2 S , and 2 P Λ c and 1 D , 2 S , and 2 P Ξ c charmed baryons, belonging to the flavor antitriplet ( 3 ¯ F ), using the constituent quark model. We compute electromagnetic transitions from ground and P -wave states to ground states, as well as from second-shell states to both ground and P -wave final states. Electromagnetic decay widths are especially valuable for identifying resonances when multiple states share similar mass and total decay width. We give branching ratios of several electromagnetic decay widths that can confirm the assignment of the Ξ c ( 3055 ) reported by LHCb. Likewise, we provide branching-ratio predictions that can help guide the assignment of the Ξ c ( 3080 ) states, and discuss their possible interpretation either as 1 D states with J P = 5 / 2 + or as 2 S states with J P = 1 / 2 + . For the first time, this work provides calculations of electromagnetic decays for D ρ -wave states, ρ − λ mixed configurations, and ρ -mode radially excited states in singly charmed baryons of the flavor antitriplet. Both experimental and model-dependent uncertainties are taken into account throughout our analysis.

In this work, we study the radiative decays of the Σ c , Ξ c ′ , and Ω c charmed baryons, which belong to the flavor sextet ( 6 F ), within the constituent quark model formalism. The electromagnetic transitions are calculated from the ground and P -wave states to ground states, as well as from the second shell states to both the ground and P -wave final states. These decays play a crucial role in confirming the existence of certain resonances when strong decays are not allowed. Moreover, electromagnetic decay widths are particularly useful for identifying resonances when states have the same mass and total decay width. A relevant case is the Ω c ( 3327 ) state, whose branching ratios between the strong decay channels are comparable; thus, the radiative decay widths may help assign this state. We also make the assignment of the recently discovered Ξ c ′ ( 2923 ) + baryon, which is consistent with being the isospin partner of the Ξ c ′ ( 2923 ) 0 . This study presents, for the first time, the calculation of electromagnetic decays for D ρ -wave states, ρ − λ mixed states, and ρ -mode radially excited states in the charm sector. Throughout our calculations, we account for uncertainties arising from both experimental and model-dependent errors.

In this work, we investigate the radiative decays of the Λ b and Ξ b bottom baryons, which belong to the flavor antitriplet ( 3 ¯ F ), within the constituent quark model formalism. The electromagnetic transitions are calculated from the second shell states to both the ground and P -wave final states. These decays may help confirm the existence of certain resonances. Moreover, electromagnetic decay widths provide additional information that can be particularly useful for distinguishing resonances with the same mass and total decay width. This study presents, for the first time, the calculation of electromagnetic decays for D ρ -wave states, ρ − λ mixed states, and ρ -mode radially excited states. Throughout our calculations, we account for uncertainties arising from both experimental and model-dependent errors.

We calculate the 1 D , 2 P , and 2 S mass spectra of the singly bottom baryons and their strong decay widths. The calculations are performed within a harmonic oscillator quark model that incorporates the spin, spin-orbit, isospin, and flavor interactions. To obtain the model parameters, we conducted a fit using only 13 of the 22 experimentally observed states. Our predictions align well with the observed states, showing a root-mean-square deviation of 9.6 MeV. We calculate the three-quark strong decay widths within the P 0 3 model, which has only one free parameter, the pair creation strength γ 0 ; this is the first time that the Λ b η , Σ b ρ , Σ b * ρ , Λ b η ′ , Λ b ω , Ξ b K , Ξ b ′ K , Ξ b * K , Ξ b K * , Ξ b ′ K * , and Ξ b * K * channels have been considered in the calculation of the strong decay widths of the excited Λ b states; the Σ b η , Ξ b K , Σ b ρ , Σ b * ρ , Λ b ρ , Σ b * η , Σ b η ′ , Σ b * η ′ , Ξ b ′ K , Ξ b * K , Ξ b K * , Ξ b ′ K * , Ξ b * K * , Σ b ω , Σ b * ω , Σ 8 B s , Δ B , N ( 1520 ) B , N ( 1535 ) B , N ( 1680 ) B , and N ( 1720 ) B channels in the calculation of the strong decay widths of the excited Σ b states; the Λ b K * , Ξ b ρ , Ξ b ′ ρ , Ξ b * ρ , Σ b K * , Σ b * K * , Ξ b η ′ , Ξ b ′ η ′ , Ξ b * η ′ , Ξ b ω , Ξ b ′ ω , Ξ b * ω , Ξ b ϕ , Ξ b ′ ϕ , Ξ b * ϕ , Ξ 8 B s , Σ 8 B * , and Σ 10 B channels in the calculation of the strong decay widths of the excited Ξ b and Ξ b ′ states; the Ξ b K * , Ξ b ′ K * , Ξ b * K * , Ω b η , Ω b * η , Ω b ϕ , Ω b * ϕ , Ω b η ′ , Ω b * η ′ , Ξ 8 B , and Ξ 10 B channels in the calculation of the strong decay widths of the Ω b states. Moreover, in Appendix D, we give the flavor couplings that can be useful for other articles. In Appendix E, our partial decay widths are reported for each open flavor channel; these may be useful to the LHCb, ATLAS, and CMS experimentalists in order to plan in which particular channels to look for missing bottom baryons. The experimental masses and widths of the discovered Λ b ( 6146 ) 0 and Λ b ( 6152 ) 0 states are consistent with our mass and width predictions for the D λ excitations with quantum numbers J P = 3 2 + and J P = 5 2 + , respectively. Moreover, the masses and widths of the new Ξ b ( 6327 ) 0 and Ξ b ( 6333 ) 0 states agree with our calculations for the D λ excitations with quantum numbers J P = 3 2 + and J P = 5 2 + , respectively. Finally, we calculate the electromagnetic decay widths from P -wave states to ground states. We give the exact analytical expressions of the spin-flip and orbit-flip transition amplitudes, both of which are functions of the photon-transferred momentum. The electromagnetic decays are dominant when the strong decays are suppressed. A relevant case is the Ω b − missing spin excitation, with J P = 3 2 + , which cannot decay strongly, but has a nonvanishing predicted electromagnetic decay width in the Ω b − γ channel. Therefore, we suggest the Ω b − γ electromagnetic decay channel as a golden channel in which to search for this state. In all of our calculations, we report the uncertainties related to the experimental and model errors by means of the Monte Carlo bootstrap method. Published by the American Physical Society 2024

We give an updated view of the status and prospects of heavy-ion double charge exchange (HI-DCE) reaction studies performed at the Laboratori Nazionali del Sud of the Istituto Nazionale di Fisica Nucleare (INFN-LNS) in the context of the NUMEN project. The important role of HI-DCE for nuclear reaction, nuclear structure and double beta-decay investigations is outlined. A powerful way to scrutinize the nuclear response to HI-DCE is to consistently link it to the information extracted from the competing direct reactions pointing to a multi-channel description of the whole network of quasi-elastic processes. Indeed, these complementary studies are mandatory in order to minimize the systematic errors in the data analyses and build a many-facets and parameter-free representation of the systems under study.

The mini proceedings of the "Fourth International Workshop on the Extension Project for the J-PARC Hadron Experimental Facility (HEF-ex 2024) [https://kds.kek.jp/event/46965]" held at J-PARC, February 19-21, 2024, are presented. The workshop was devoted to discussing the physics case that connects both the present and the future Hadron Experimental Facility at J-PARC, covering a wide range of topics in flavor, hadron, and nuclear physics related to both experimental and theoretical activities being conducted at the facility.