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In this review we do not try to cover all the aspects of physics besnd tile standard model (BSM), instead our latest understanding on tile BSM will be presented: i) Tile Higgs sector is likely related to BSM, which can be confirmed at current running large hadron collider (LHC) or tile fllture eolliders. Furthermore we pointed out that spontaneous CP violation can be closely related to the lightness of the Higgs boson, ii) Top quark forward-backward asymmetry, which was mea.sured by Tewttron, might be the sign of BSM.2; proposed a new color-octet particle Zcr to account fi)r the observation and Z can be fllrther studied at the LHC. iii) If dark matter (DM) is utilized to accommodate astrophysical obserwtions, it ought to be observed at the high energy LttC and DM produced at colliders should be tile slnoking gun signal, iv) Lithium puzzle might also be the sign of the BSM. We briefly review tile newly proposed solution to Lithium puzzle, i.e.. the existonce of non-thermal component during the big bang nuclei-synthesis (BBN). The possible origins of the non-thermal coinponent can be dark matter or the new accelerating mechanism of normal particles. 相似文献
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To achieve a high precision τ mass measurement at the high luminosity experiment BESIII,Monte Carlo simulation and sampling technique are utilized to simulate various data taking cases for single and multiparameter fits by virtue of which the optimal scheme is determined. The optimized proportion of luminosity distributed at selected points and the relation between precision and luminosity are obtained. In addition,the optimization of the fit scheme is confirmed by scrutinizing a variety of fit possibilities. 相似文献
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A top quark mass measurement scheme near the t production threshold in future e~+e~- colliders, e.g. the Circular Electron Positron Collider(CEPC), is simulated. A χ~2 fitting method is adopted to determine the number of energy points to be taken and their locations. Our results show that the optimal energy point is located near the largest slope of the cross section v. beam energy plot, and the most efficient scheme is to concentrate all luminosity on this single energy point in the case of one-parameter top mass fitting. This suggests that the so-called data-driven method could be the best choice for future real experimental measurements. Conveniently, the top mass statistical uncertainty can also be calculated directly by the error matrix even without any sampling and fitting. The agreement of the above two optimization methods has been checked. Our conclusion is that by taking 50 fb~(-1) total effective integrated luminosity data, the statistical uncertainty of the top potential subtracted mass can be suppressed to about 7 Me V and the total uncertainty is about 30 Me V. This precision will help to identify the stability of the electroweak vacuum at the Planck scale. 相似文献
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The diphoton invariant mass distribution from the interference between gg→H→γγ and gg→γγ is almost antisymmetric around the Higgs mass MH.We propose a new observable Aint,the ratio of the sign-reversed integral around MH(e.g.■)and the cross-section of the Higgs signal,to quantify this effect.We study Aint both in the Standard Model(SM)and new physics with various CP violating Hγγ couplings.Aint in SM could reach a value of 10%,while for CP violating Hyy coupling Aint could range from 10% to-10%,which could probably be detected in the HL-LHC experiments.Aint with both CP violating Hγγ and Hgg couplings is also studied,and its range of values is found to be slightly larger. 相似文献
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