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首页> 外文期刊>Physics Letters, B. Nuclear Physics and High Energy Physics >Pion-induced production of hidden-charm pentaquarks P-c(4312), P-c(4440), and P-c(4457)
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Pion-induced production of hidden-charm pentaquarks P-c(4312), P-c(4440), and P-c(4457)

机译：介质诱导的隐藏式魅力Pentaquarks P-C（4312），P-C（4440）和P-C（4457）

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摘要

The production of the hidden-charm pentaquarks via a pion-induced reaction on a proton target is investigated within an effective Lagrangian approach. Three experimentally observed states, P-c(4312), P-c(4440), and P-c(4457), are considered in calculation, and the Reggeized t-channel meson exchange is considered as main background for the reaction pi(-)p -> J/psi n. The numerical results show that the experimental data of the total cross section at W similar or equal to 5 GeV can be well explained by the contribution from the Reggeized t channel with reasonable cutoff. If the branching ratios Br[P-c -> J/psi N] similar or equal to 3% and Br[P-c -> pi N] similar or equal to 0.05% are taken, the average value of the cross section from the P-c(4312) is about 1.2 nb/100 MeV, which is consistent with existing rude data at near-threshold energies. The results indicate that the branching ratios of the P-c state decays into J/psi N and pi N should be small. The differential cross section shows a sharp increase at extreme forward angles due to the Reggeized t-channel contribution while the contributions from the P-c states are relatively flat. High-precision experimental measurement on the reaction pi(-)p -> J/psi n at near-threshold energies is suggested to confirm the LHCb hidden-charm pentaquarks as genuine states, and such measurement is also helpful to understand the origins of these resonance structures. (C) 2019 The Authors. Published by Elsevier B.V.
机译：在有效的拉格朗日方法中，研究了通过对质子靶的沟诱导的反应的隐藏式魅力五花程的生产。在计算中考虑了三种实验观察状态，PC（4312），PC（4440）和PC（4457），并将原探的T沟道MESON交换被认为是反应PI（ - ）P - > J的主要背景/ psi n。数值结果表明，W类似于或等于5 GEV的W相似或等于5 GEV的实验数据可以通过具有合理的截止的原理T通道的贡献很好地解释。如果采用类似或等于3％的分支率Br [PC - > J / PSI n]和BR [PC - > PI n]，则PC的横截面的平均值（4312 ）约为1.2 NB / 100 MeV，这与近阈值能量的现有粗鲁数据一致。结果表明，P-C状态的分支比衰减成J / PSI N和PI n应小。差分横截面显示出在极端前向角度的急剧增加，由于探测器的T渠道贡献，而P-C状态的贡献相对平坦。在近阈值的反应PI（ - - ）P - > J / PSI n上的高精度实验测量建议确认LHCB隐藏魅力Pentaquarks作为真正的状态，这种测量也有助于了解这些的起源共振结构。 （c）2019年作者。由elsevier b.v出版。

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