The Production Of Charmonium/Charmoniumlike State And Charmed Baryon

The standard model has successfully described the interaction of matter in themicro cosmos. However, there is still a lack of any reliable approach to deal with theQCD nonperturbative problem. Since the discovery of X(3872) in2003, more andmore charmoniumlike states referred to as XYZ have been announced by various ex-periments. These XYZ states have stimulated lots of interests because they provideus a good platform to study the nonperturbative behavior of QCD. As we know, mostof the observed XYZ are reported from the B factory, which correspond to the γγ fu-sion process, the B meson decay, the e+e annihilation and the hidden-charm dipiondecays of higher charmonia and charmoniumlike states. It is obvious that probing theproduction of XYZ by diferent processes from the formerly referred processes is aninteresting topic. The forthcoming experiment PANDA provides us an ideal platformto study hadron physics. It studies interactions between antiprotons and fixed targetprotons and nuclei in the momentum range of1.5-15GeV. The luminosity can reachup to2×1032cm2s1. All measurements will profit due to the fact that, in contrast toe+e reactions, all non-exotic quantum number combinations for directly formed statesare allowed, whereas states with exotic quantum numbers can be observed in produc-tion. Thus, studies of the production of new hadron states via various mechanismswill be valuable for these experiments. Considering the above reasons, we study theproduction of the new hadron states in low-energy p pˉcollisions and photoproductionprocesses. The work includes the following aspects: 1. We calculate the total cross sections and the angular distributions of thecharomnium production plus a light meson by the low energy p pˉinteraction in thecenter-of-mass frame. The results of p pˉ�'π0Ψ and p pˉ�'ωΨ with and without FFindicate that the FF contribution in the calculation cannot be ignored. We also find thatthese physical quantities are dependent on Dirac (gω) and Pauli (κω) coupling constantsof the ppω interaction. Thus, p pˉ�'ωΨ can be as the ideal channel to test the diferenttheoretical values of gωand κω. Applying the formulae of p pˉ�'π0Ψ and p pˉ�'ωΨ,we predict the total cross sections of the p pˉ�'ηΨ and p pˉ�'ρΨ reactions. The aboveobservations can be directly tested at the forthcoming PANDA experiment.2. We explore the production potential of Λc(2880)+at PANDA. With the JP=5+2assignment to Λc(2880)+, we calculate the diferential and total cross sections ofp pˉ�'Λ cΛc(2880)+. We also perform the Dalitz plot analysis and give the pD0in-variant mass spectrum distribution of the process p pˉ�'Λ cpD0, where the signaland background contributions are considered. Our numerical results indicate that theproduction of Λc(2880)+may reach up to20μb, where about107events can be accu-mulated per day if taking the designed luminosity (2×1032cm2s1) of PANDA.3. We explore the production of the newly observed charged charmonium-likestate Zc(3900)±by the photonproduction process γp�'Zc(3900)+n. Our numeri-cal result indicates that the maximum of the calculated total cross section of γp�'Zc(3900)+n can reach up to the order of0.1μb. Furthermore, the Dalitz plot analysisis performed by considering the pomeron exchange as the background contribution.This analysis shows that the Zc(3900)+signal can be distinguished from the back-ground easily and the best energy window of searching for Z√c(3900)+iss7GeV,which are important information to further experimental study of Zc(3900)+by mesonphotoproduction.4. Inspired by the observation of charmonium-like state X(3915), we explore thediscovery potential of the X(3915) production via meson photoproduction process. Byinvestigating the γp�'J/ψωp process including the X(3915) signal and backgroundcontributions, we obtain the corresponding information of the cross section, the Dalitzplot and the J/ψω invariant mass spectrum, which is helpful to further experimentalstudy of X(3915) via meson photoproduction. With the current experiment, this thesis proposes the predictions and suggestionsfor the forthcoming experiments. We hope our results can be tested by the experimentsperformed in the future. Though limited, the phenomenology model adopted in ourcalculations is in fact consistent with the quantum chromodynamics theory and hascertain applicability in a way. In the meantime, the thesis discusses extensively aboutthe rationality of some widely adopted models and the range of parameters so as toprepare fully for the further modifications of the models.