A Search for Solar Axions and Anomalous Neutrino Magnetic Moment with the Complete PandaX-II Data*

Zhou, Xiaopeng; Zeng, Xiaoqin; Ning, Xuyang; Abdukerim, Abdusalam; Chen, Wei; Chen, Xun; Chen, Yunhua; Cheng, C. H.; Cui, X. F.; Yang, Fan; Fang, Deqing; Fu, Changbo; Fu, Mengting; Geng, Li-Sheng; Giboni, Karl; Gu, Linhui; Guo, Xuyuan; }}$, Ke Han$^{ hyperlink{s}{; He, Changda; Huang, Di; Huang, Yan; Huang, Yanlin; Huang, Zhongqiang; Ji, Xiangdong; Ju, Yonglin; Li, Shuaijie; Liu, Huaxuan; Liu, Jianglai; Lu, Xiaoying; Ma, Wenbo; Ma, Yugang; Mao, Y.; Meng, Y.; Ni, K.; Ning, Jinhua; Ren, Xiangxiang; Shang, Changsong; Shen, Guangqiu; Si, Lin; Tan, Andi; Wang, Andrew; Wang, Hongwei; Wang, Meng; Wang, Qiuhong; Wang, Siguang; Wang, Wei; Wang, Xiuli; Wang, Zhou; Wu, M.; Wu, Shiyong; Wu, Weihao; Xia, Jingkai; Xiao, M.; Xie, Pengwei; Yan, Binbin; Yang, Jijun; Yang, Y.; Yu, C. X.; Yuan, Jumin; Yuan, Ying; Zhang, Dan; Zhang, Tao; Zhao, Li; Zheng, Qibin; Zhou, Jifang; Zhou, N.

doi:10.1088/0256-307x/38/1/011301

Cited by 40 publications

(26 citation statements)

References 47 publications

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“…Some amount of tritium events is also identified in the data. The origin is likely due to some left-over tritium from PandaX-II end-of-run calibration [30]. The event rate is left float from each set, with a total fitted 532 ± 32 events in the FV and an average concentration of 5 × 10 −24 mol/mol in xenon.…”

mentioning

confidence: 99%

Dark Matter Search Results from the PandaX-4T Commissioning Run

Meng,

Wang,

Tao

et al. 2021

Preprint

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We report the first dark matter search results using the commissioning data from PandaX-4T. Using a time projection chamber with 3.7-tonne of liquid xenon target and an exposure of 0.63 tonne•year, 1058 candidate events are identified within an approximate electron equivalent energy window between 1 and 30 keV. No significant excess over background is observed. Our data set a stringent limit to the dark matter-nucleon spin-independent interactions, with a lowest excluded cross section (90% C.L.) of 3.3 × 10 −47 cm 2 at a dark matter mass of 30 GeV/c 2 .

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confidence: 99%

Dark Matter Search Results from the PandaX-4T Commissioning Run

Meng,

Wang,

Tao

et al. 2021

Preprint

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“…Although the XENON1T excess can be explained by new physics, the significance is not large enough and there is still no definite conclusion for the DM-electron interaction [2]. Especially, the tritium background is also possible explanation [2,3]. More data is necessary to obtain a conclusive result.…”

Section: Predictions For Future Dm Experimentsmentioning

confidence: 97%

“…The particle nature and properties of dark matter (DM) can be probed by the direct detection experiments, typically utilizing nuclear or electron recoils [1]. Recently, the XENON1T experiment found an excess in the electron recoil spectrum around 2 ∼ 3 keV [2] which was independently checked by the PandaX-II experiment [3]. Although solar neutrinos can also scatter with electron via the Standard Model (SM) weak interactions, this signal can contribute only 0.52% of the total events as background and more importantly the electron recoil spectrum is quite flat in the observed keV range [4].…”

Section: Introductionmentioning

confidence: 99%

“…While the SM neutrino interactions can only produce a flat event spectrum, a low energy peak arises if there is a BSM interaction with light mediator. Possible realizations include magnetic dipole moment, charge radius and anapole [3,[46][47][48][49][50][51][52][53][54], all with the massless photon as mediator. In addition, light scalar [55][56][57] and vector [55][56][57][58][59][60][61][62][63] mediators can also achieve the same purpose.…”

Section: Introductionmentioning

confidence: 99%

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Solar Active-Sterile Neutrino Conversion with Atomic Effects at Dark Matter Direct Detection Experiments

Ge,

Pasquini,

Sheng

2021

Preprint

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The recent XENON1T excess can be explained by the solar active-sterile neutrino conversion with bound electrons via light mediator. Nevertheless, the atomic effects are usually omitted in the solar neutrino explanations. We systematically establish a second quantization formalism for both bound and ionized electrons to account for the atomic effects. This formalism is of great generality to incorporate various interactions for both neutrino and dark matter scatterings. Our calculation shows that the change in the cross section due to atomic effects can have important impact on the differential cross section. It is necessary to include atomic effects in the low-energy electron recoil signal at dark matter direct detection experiments even for energetic solar neutrinos. With the best-fit values to the XENON1T data, we also project the event rate at PandaX-4T, XENONnT, and LZ experiments.

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“…In 2020, both Xenon1T and PandaX-II collaborations published their electron recoil spectrum [106,112]. An excess around (2 ∼ 3) keV appears in the Xenon1T data with significance reaching 3σ.…”

Section: B Confronting the Xenon1t And Pandax-ii Datamentioning

confidence: 99%

Revisiting the Fermionic Dark Matter Absorption on Electron Target

Ge,

He,

et al. 2022

Preprint

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We perform a systematic study of the fermionic DM absorption interactions on electron target in the context of effective field theory. The fermionic DM absorption is not just sensitive to sub-MeV DM with efficient energy release, but also gives a unique signature with clear peak in the electron recoil spectrum whose shape is largely determined by the atomic effects. Fitting with the Xenon1T and PandaX-II data prefers DM mass at m χ = 59 keV and 105 keV, respectively, while the cut-off scale is probed up to around 1 TeV. The DM overproduction in the early Universe, the invisible decay effect on the cosmological evolution, and the astrophysical X(gamma)-ray from the DM visible decays are thoroughly explored to give up-to-date constraints. With stringent bounds on the tensor and pseudo-scalar operators, the other fermionic DM operators are of particular interest at tonne-scale direct detection experiments such as PandaX-4T, XENONnT, and LZ.

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A Search for Solar Axions and Anomalous Neutrino Magnetic Moment with the Complete PandaX-II Data*

Cited by 40 publications

References 47 publications

Dark Matter Search Results from the PandaX-4T Commissioning Run

Dark Matter Search Results from the PandaX-4T Commissioning Run

Solar Active-Sterile Neutrino Conversion with Atomic Effects at Dark Matter Direct Detection Experiments

Revisiting the Fermionic Dark Matter Absorption on Electron Target

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