ϕ(2170) production in the process γp→ηϕp

Abstract

We have studied the γp → ηφp reaction within the effective Lagrangian approach, by considering the contribution of the intermediate state φ(2170) production, and the background contributions of t-channel π 0 and η mesons exchanges with the intermediate states N and N (1535). Our calculations show that there may be a peak, at least a bump structure around 2180 MeV associated to the resonance φ(2170) in the ηφ mass distribution. We suggest to search for the resonance φ(2170) in this reaction, which would be helpful to shed light on its nature. PACS numbers:

Bayesian Evaluation of Incomplete Fission Yields

“…The two peaks corresponding to asymmetric fission modes decrease. It is known that the symmetric fission mode will play a role as excitation energies increase [18,19]. We demonstrated that the features of energy dependent fission yields can be successfully described by the BNN evaluation.…”

“…The fission of compound nuclei involve fades of quantum effects as excitation energies increase [3,18]. It is more sophisticated to describe the energy dependence of FPY [18,19] and post-neutron FPY (independent FPY) [20]. Furthermore, the uncertainty quantification of nuclear models has become a pressing issue in recent years [21].…”

Study of φ(2170) at BESIII

“…The discovery of the φ(2170) has sparked extensive discussions about its internal structure. Proposed explanations include: a ssg hybrid state [16][17][18][19], either the 2 3 D 1 [20][21][22][23] or 3 3 S 1 [24,25] ss state, a ssss tetraquark state [26][27][28][29][30][31][32][33][34], a Λ Λ molecular state [35][36][37][38][39][40], a φf 0 (980) resonance [32,[41][42][43] including final state interaction effects [8,44], a S-wave threshold effect [44], and a X(2240) state [45]. The situation cannot be clarified without further experimental data.…”

Measurement of $e^+ e^- \to ϕπ^+ π^-$ cross sections at center-of-mass energies from 2.00 to 3.08 GeV

“…This observation stimulated speculation that the φ(2170) resonance might be a strangeonium counterpart of the charmonium resonance ψ(4260) due to similarities in their production and decay pattern [8]. Considerable efforts have been made theoretically to understand the nature of the φ(2170) resonance and abundant interpretations have been proposed, including a traditional ss state [9][10][11][12][13][14], an ssg hybrid [8,15], an ssss tetra-quark state [16][17][18][19][20][21][22][23], a Λ Λ bound state [24][25][26][27][28] and an ordinary φK K or φf 0 (980) resonance produced by interactions between the final state particles [29,30]. The model predictions differ in both mass and width of the resonance.…”