MENU 2016

Session

Pentaquarks

26 Jul 2016, 14:15

2F Hall I (Clock Tower Centennial Hall, Kyoto University)

Conveners

Pentaquarks: A-3 / 26-PQ-1

• Bing-Song Zou

Pentaquarks: C-4 / 27-PQ-2

• Yoichi Ikeda

76. The $\Lambda_{b}\rightarrow J/\psi K^{0}\Lambda$ and $\Lambda_b$ into $J/\psi \eta \Lambda$reactions and a hidden-charm pentaquark state with strangeness

Eulogio Oset (IFIC, Univversity of Valencia)

26/07/2016, 14:15

We study the Λ_b → J/ψ K0 Λ reaction considering both the K0 Λ interaction with its coupled channels and the J/ψΛ interaction. The latter is described by taking into account the fact that there are predictions for a hidden-charm state with strangeness that couples to J/ψΛ. By using the coupling of the resonance to J/ψΛ from these predictions we show that a neat peak can be observed in the J/ψΛ...

78. Exotic pentaquark spectroscopy

Elena Santopinto (INFN)

26/07/2016, 14:45

We study the possibility that at least one of the two pentaquark structures recently reported by LHCb, can be described as a compact pentaquark state, and we give predictions for new channels that can be studied by the experimentalist if this hypothesis was correct. We use very general arguments dictated by symmetry considerations, in order to describe pentaquark states within a symmetry...

81. ccbar pentaquarks by a quark model

Sachiko Takeuchi (Japan College of Social Work)

26/07/2016, 15:15

Recent LHCb experiments show us that there are two resonances in the N-J/Psi channel, whose spin and parity are most probably (3/2- 5/2+). In this work, we will show that there is a state which gains a large attraction from the color-magnetic interaction in the uudccbar I(JP)=1/2(3/2-) channel, which appears as a resonance in the Lambda_c Dbar* channel, when one employs a quark model. We also...

32. $\bar{D}\Sigma^*_c$ and $\bar{D}^*\Sigma_c$ interactions and the LHCb hidden-charmed pentaquarks

Jun He (Institute of Modern Physics, Chinese Academy of Sciences)

27/07/2016, 14:15

Recently, two hidden-charmed resonances $P_c(4380)$ and $P_c(4450)$ consistent with pentaquark states were observed at the LHCb detector. The two $P_c$ states locate just below the $\bar{D}\Sigma^*_c$ and $\bar{D}^*\Sigma_c$ thresholds with mass of gaps about 5 and 15 MeV, respectively. Inspired by this fact we perform a dynamical investigation about the $\bar{D}\Sigma_c^*(2520)$ and...

33. Understanding the nature of the heavy pentaquarks and searching for them in pion-induced reactions

Xiao-Hai LIU (Tokyo Institute of Technology)

27/07/2016, 14:45

The LHCb collaborations recently reported the observations of two resonance-like structures, which could be the long-searching-for pentaquark states. When studying these heavy pentaquark candidates, usually one will confront two issues, i.e., what their underlying structures are and how to search for them in experiments. We indicated that these resonance-like peaks may be resulted from some...

35. Pc(4450) and triangle singularity

Feng-Kun Guo (Institute of Theoretical Physics, CAS)

27/07/2016, 15:15

We want to discuss the Pc(4450) structure observed by the LHCb Collaboration in the J/psi proton final states. We want to point out that it is located exactly at the chi_{c1}-proton threshold, and coincides with the leading Landau singularity of the triangle loop Lambda(1890)-chi_{c1}-proton. We also discuss how to distinguish a genuine resonance from the kinematical singularity.