Fragmentation-fraction ratio 
                
                  
                
                $$f_{\Xi _b}/f_{\Lambda _b}$$
                
                  
                    
                      
                        f
                        
                          Ξ
                          b
                        
                      
                      /
                      
                        f
                        
                          Λ

Jiang, H. L.; Yu, Fu-Sheng

doi:10.1140/epjc/s10052-018-5704-5

Cited by 31 publications

(30 citation statements)

References 43 publications

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“…Finally, some useful formulas are displayed in the Appendix. It should be mentioned that several formulas presented in this manuscript about the Z 0 -like X hypothesis overlap with those in our previous work [48], however with different concerns.…”

supporting

confidence: 46%

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Exploring bosonic mediator of interaction at BESIII

2019

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We present a comprehensive investigation on the possibility of the search for new force mediator X boson in e + e − collision and J/ψ decay at the BESIII experiment. The typical interactions of X boson coupling to leptons and quarks are explored. The production and decay properties of this X particle, the product/decay chains e + e − → Xγ → e + e − γ and J/ψ → Xγ → µ + µ − γ, and exclusion limits on the reduced coupling strength parameters as functions of X boson mass are presented. With the data set of tens of fb −1 e + e − or 10 10 J/ψ, we find that the exclusion limits on the coupling strength parameters fall in the range of 10 −3 ∼ 10 −4 , depending on m X assuming the decay width 10 eV< Γ X <100 eV reasonably, for various hypotheses in the literature. According to our estimation, the search for new force mediator X boson in both e + e − collision and J/ψ decay are accessible in nowadays BESIII experiment.

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confidence: 46%

“…Note that only the contribution of the ISR background process is considered. For more analysis on the signal reconstruction and SNR estimation, please refer to our previous work [48]. Signal process Background process SNR ( GeV, its total decay width would be Γ X = 10 ∼ 100 eV, i.e.…”

Section: A Spin-1 Hypothesismentioning

confidence: 99%

Exploring bosonic mediator of interaction at BESIII

2019

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“…To be specific, we quote the numerical values that have been obtained with high-precision loop-cluster simulations (see Refs. [38,39]) for the square lattice,…”

Section: Free Energy Densitymentioning

confidence: 99%

Square-lattice antiferromagnet subjected to a magnetic field aligned with the order parameter

Hofmann

2020

J. Stat. Mech.

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The thermal properties of antiferromagnetic films -in particular, the square-lattice antiferromagnet -subjected to an external magnetic field pointing into the direction of the staggered magnetization are explored. The effective field theory analysis of the free energy density is carried out to two-loop order. While the emphasis is on finite temperature, we also discuss the behavior of the magnetization and staggered magnetization at zero temperature. Our results imply that the staggered magnetization increases in presence of the magnetic field -reminiscent of magnetic catalysis. Most remarkably, if staggered and magnetic field strength are kept fixed, the magnetization initially grows when temperature increases.

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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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Fragmentation-fraction ratio $$f_{\Xi _b}/f_{\Lambda _b}$$ f Ξ b / f Λ

Cited by 31 publications

References 43 publications

Exploring bosonic mediator of interaction at BESIII

Exploring bosonic mediator of interaction at BESIII

Square-lattice antiferromagnet subjected to a magnetic field aligned with the order parameter

17 MeV Atomki anomaly from short-distance structure of spacetime

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