X(16.7) production in electron–positron collision

Jiang, Jun; Chen, Long-Bin; Liang, Y. F.; Qiao, C. F.

doi:10.1140/epjc/s10052-018-5945-3

Cited by 12 publications

(12 citation statements)

References 89 publications

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“…The best fit to the mass of the new gauge boson is 16.70 ± 0.35(sta) ± 0.5(sys) MeV. Various models have been proposed to explain the 8 Be anomaly in other U(1) gauge symmetries [42][43][44][45][46][47][48][49][50][51][52][53][54][55]. In these studies, the U(1) gauge symmetry corresponding to the new gauge boson is introduced through the extension of the SM gauge symmetry group.…”

Section: Introductionmentioning

confidence: 99%

17 MeV Atomki anomaly from short-distance structure of spacetime

Nam

2020

Eur. Phys. J. C

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An anomaly observed recently in the 8 Be nuclear transition by the Atomki collaboration hints at a weakly-coupled, light new gauge boson with a mass about 17 MeV. In this paper, we propose that this new gauge boson comes from a short-distance structure of the spacetime, rather than from an extension of the Standard Model through adding an extra U(1) gauge symmetry. The dominant contribution to the relevant matrix element of the 8 Be nuclear transition is given by the axial couplings. For accounting for the 8 Be anomaly and satisfying the current experimental constraints, the coupling constant of the new gauge boson should be about O(10 −4 − 10 −5 ). Our theoretical model allows to understand the origin of the smallness of the coupling constant, which is still missing or being incompletely understood in the models at which the new gauge boson has the axial couplings. * Electronic address: hncao@yonsei.ac.kr arXiv:1907.09819v1 [hep-ph]

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Section: Introductionmentioning

confidence: 99%

17 MeV Atomki anomaly from short-distance structure of spacetime

Nam

2020

Eur. Phys. J. C

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“…[30][31][32][33] (for more discussion, see, e.g., Refs. [34][35][36][37][38]), and the vector/axial vector X portal DM particles were studied in Refs. [39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Could the 21-cm absorption be explained by the dark matter suggested by $$^8$$ 8 Be transitions?

2018

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The stronger than expected 21-cm absorption was observed by EDGES recently, and another anomaly of 8 Be transitions would be signatures of new interactions. These two issues may be related to each other, e.g., pseudoscalar A mediated fermionic millicharged dark matter (DM) and the 21-cm absorption could be induced by photon mediated scattering between MeV millicharged DM and hydrogen. This will be explored in this paper. For fermionic millicharged DMχχ with masses in a range of 2m A < 2m χ < 3m A , the p-wave annihilationχχ → A A would be dominant during DM freeze-out. The s-wave annihilation χχ → A, γ → e + e − is tolerant by constraints from CMB and the 21-cm absorption. The millicharged DM can evade constraints from direct detection experiments. The process of K + → π + π 0 with the invisible decay π 0 →χχ could be employed to search for the millicharged DM, and future high intensity K + sources, such as NA62, will do the job.

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“…The transfer of metals from the soil to plants is influenced by a variety of soil parameters. The main parameters of the soil which influence absorption and desorption processes are [3,8,9,[19][20][21][22][23][24][25][26][27][28]:…”

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Mathematical Modeling for the Absorption Capacity of Heavy Metals from the Soil in the Case of Phragmites Australis Plant Species

Chiţimuş¹,

Nedeff²,

Sandu³

et al. 2019

Rev. Chim.

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This paper proposes a tridimensional mathematical model of the absorption capacity of heavy metals (cadmium and nickel) from the soil in the case of Phragmites Australis plant species (the soil and plant samples was taken from six locations/areas along the Bistri�a and Crac�u Rivers, belonging to the Siret hydrographic basin). The variable measures taken into consideration when carrying out the experiments and realizing the mathematical model are the distance from the water-soil interface from which the plant samples were taken and the concentration of the heavy metals in the soil. The mathematical model was elaborated and tested by means of the TableCurve 3D program used for generating linear and non-linear equations. A very high absorption capacity of cadmium from the soil was recorded A very high absorption capacity of cadmium from the soil was recorded, in the case of Phragmites Australis plant species (190�234 % higher than in the soil). The correlation coefficient of the mathematic model was between 0.90 and 0.98.

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X(16.7) production in electron–positron collision

Cited by 12 publications

References 89 publications

17 MeV Atomki anomaly from short-distance structure of spacetime

17 MeV Atomki anomaly from short-distance structure of spacetime

Could the 21-cm absorption be explained by the dark matter suggested by $$^8$$ 8 Be transitions?

Mathematical Modeling for the Absorption Capacity of Heavy Metals from the Soil in the Case of Phragmites Australis Plant Species

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