Simulation of dark photon sensitivity in $η\rightarrow γe^+e^-$ at HIAF
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866913892054073344 |
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| author | Mushtaq, Zaiba Wang, Rong Kang, Xiaolin Liu, Yang Tian, Ye He, Xiong Qiu, Hao Chen, Xurong |
| author_facet | Mushtaq, Zaiba Wang, Rong Kang, Xiaolin Liu, Yang Tian, Ye He, Xiong Qiu, Hao Chen, Xurong |
| contents | We present a simulation study of dark photon sensitivity in a suggested $η$ factory experiment at Huizhou. The vast number of $η$ mesons are produced by bombarding the high-intensity HIAF proton beam on a multi-layer target of light nucleus. The kinematic energy of the beam is at 1.8 GeV. For a prior experiment of one-month running, about $5.9 \times 10^{11}$ $η$ samples would be collected, providing substantial data for a sound statistical analysis. A compact spectrometer based on the full silicon-pixel tracker is conceptually designed for the detection of the final-state particles. The GiBUU event generator is utilized for the background estimation without the dark photon signal. A spectrometer simulation package ChnsRoot is constructed for evaluating the spectrometer performances in searching the dark photon in $η$ rare decay. The efficiency and resolutions of $η\rightarrow γe^+e^-$ decay channel are studied in detail. The branching-ratio upper limit of dark photon in $η\rightarrow γe^+e^-$ decay and the sensitivity to the model parameter are given from the simulations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_11733 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Simulation of dark photon sensitivity in $η\rightarrow γe^+e^-$ at HIAF Mushtaq, Zaiba Wang, Rong Kang, Xiaolin Liu, Yang Tian, Ye He, Xiong Qiu, Hao Chen, Xurong High Energy Physics - Experiment We present a simulation study of dark photon sensitivity in a suggested $η$ factory experiment at Huizhou. The vast number of $η$ mesons are produced by bombarding the high-intensity HIAF proton beam on a multi-layer target of light nucleus. The kinematic energy of the beam is at 1.8 GeV. For a prior experiment of one-month running, about $5.9 \times 10^{11}$ $η$ samples would be collected, providing substantial data for a sound statistical analysis. A compact spectrometer based on the full silicon-pixel tracker is conceptually designed for the detection of the final-state particles. The GiBUU event generator is utilized for the background estimation without the dark photon signal. A spectrometer simulation package ChnsRoot is constructed for evaluating the spectrometer performances in searching the dark photon in $η$ rare decay. The efficiency and resolutions of $η\rightarrow γe^+e^-$ decay channel are studied in detail. The branching-ratio upper limit of dark photon in $η\rightarrow γe^+e^-$ decay and the sensitivity to the model parameter are given from the simulations. |
| title | Simulation of dark photon sensitivity in $η\rightarrow γe^+e^-$ at HIAF |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2506.11733 |