Evidence for the N′(1720)3/2+ nucleon resonance from combined studies of CLAS π+π−p photo- and electroproduction data
Evidence for the N′(1720)3/2+ nucleon resonance from combined studies of CLAS π+π−p photo- and electroproduction data
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DOI：
10.1016/j.physletb.2020.135457
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发表时间：
2020-04
影响因子：
4.4
通讯作者：
V. Mokeev;V. Burkert;D. Carman;L. Elouadrhiri;E. Golovatch;R. Gothe;K. Hicks;B. Ishkhanov;E. Isupov;K. Joo;N. Markov;E. Pasyuk;A. Trivedi
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文献类型：
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作者：
V. Mokeev;V. Burkert;D. Carman;L. Elouadrhiri;E. Golovatch;R. Gothe;K. Hicks;B. Ishkhanov;E. Isupov;K. Joo;N. Markov;E. Pasyuk;A. Trivedi
对杰斐逊实验室的CLAS探测器获得的γ r，v p→ π+ π− p光生和电生反应的9个1重微分截面进行了分析，目的是建立质量范围从1.6 GeV到1.8 GeV的贡献共振。为了描述Q2独立共振质量和强子衰变宽度在1.5GeV2以下的Q2范围内的光生和电生数据，发现除了已经确定的核子共振外，还需要N′（1720）3/2+态.这项工作表明，π+ π− p光生和电生数据的联合研究对于观察这种共振至关重要。N′（1720）3/2+态和已经建立的质量为1.745GeV的N（1720）3/2+态的贡献，由于它们到πΔ和ρp末态的不同强子衰变以及它们的光电激发振幅的不同Q2演化而被很好地分开. N′（1720）3/2+态是最近建立的第一个重子共振态，它的光电耦合的Q2演化已经有了结果.这些结果对于探索重子共振态的“缺失”性质具有重要意义。
The analysis of the nine 1-fold differential cross sections for the γ r, v p→ π+ π− p photo-and electroproduction reactions obtained with the CLAS detector at Jefferson Laboratory was carried out with the goal to establish the contributing resonances in the mass range from 1.6 GeV to 1.8 GeV. In order to describe the photo-and electroproduction data with Q 2-independent resonance masses and hadronic decay widths in the Q 2 range below 1.5 GeV 2, it was found that an N′(1720) 3/2+ state is required in addition to the already well-established nucleon resonances. This work demonstrates that the combined studies of π+ π− p photo-and electroproduction data are vital for the observation of this resonance. The contributions from the N′(1720) 3/2+ state and the already established N (1720) 3/2+ state with a mass of 1.745 GeV are well separated by their different hadronic decays to the πΔ and ρp final states and the different Q 2-evolution of their photo-/electroexcitation amplitudes. The N′(1720) 3/2+ state is the first recently established baryon resonance for which the results on the Q 2-evolution of the photo-/electrocouplings have become available. These results are important for the exploration of the nature of the “missing” baryon resonances.