We show that the model of discrete spaces that we have proposed in previous contributions gives a comprehensive and detailed interpretation of the properties of the standard model of particles. Moreover the model also...We show that the model of discrete spaces that we have proposed in previous contributions gives a comprehensive and detailed interpretation of the properties of the standard model of particles. Moreover the model also suggests the possible existence of a non-standard family of particles.展开更多
In this manuscript, we present an explicit way to describe the violation of CP symmetry in the standard model (SM) of electrweak interactions. In such a way, complex Cabbibo-Kobayashi-Maskawa (CKM) matrices are achiev...In this manuscript, we present an explicit way to describe the violation of CP symmetry in the standard model (SM) of electrweak interactions. In such a way, complex Cabbibo-Kobayashi-Maskawa (CKM) matrices are achieved which stand for the violation of CP symmetry. At the beginning, two necessary but not sufficient conditions for yielding a complex CKM matrix are stated as criteria. Then we found an interesting condition between the real and imaginary parts of a Hermitian 3 × 3 matrix which may provide extra relations among its parameters and reduce the number of them from eighteen down to five. In previous investigations, this can be done only down to nine. With another assumption among some of those parameters, the mass-matrix pattern is further simplified so as to be diagonalized analytically and in consequence four matrices which reveal S<sub>N</sub> symmetries among or between quark generations are obtained. In some of such S<sub>N</sub>-symmetric cases, the derived CKM matrices are complex which indicate that CP symmetry is violated accordingly. Taking the Jarlskog invariant as an estimate of the CPV strength, the value predicted by this model is orders stronger than the empirical value detected experimentally. However, that happens to fill partly the gap between the cosmologically observed amount of Baryon Asymmetry of the Universe (BAU) and that current Standard Model of particle physics predicts. It also proves the long suspected existence of BAU-productive eras in early universe if some fermions were indistinguishable, <em>i.e.</em>, S<sub>N</sub>-symmetric, under circumstances with extremely high temperatures.展开更多
While the standard model is the most successful theory to describe all the interactions and constituents of elementary particle physics,it has been constantly scrutinized for over four decades.Weak decays of charm qua...While the standard model is the most successful theory to describe all the interactions and constituents of elementary particle physics,it has been constantly scrutinized for over four decades.Weak decays of charm quarks can be used to measure the coupling strength between quarks in different families and serve as an ideal probe for CP violation.As the lowest charm-strange baryons with three different flavors,Ξ;baryons(composed of csu or csd)have been extensively studied in experiments.In this study,we use state-of-the-art lattice QCD techniques to generate 2+1 clover fermion ensembles with two lattice spacings,a=(0.108,0.080 fm).Then,we present the first ab-initio lattice QCD calculation of the Ξ;→Ξ form factors.Our theoretical results for the Ξc→Ξl;v;decay widths are consistent with and approximately two times more precise than the latest measurements by the ALICE and Belle collaborations.Based on the latest experimental measurements,we independently obtain the quark-mixing matrix element |V;|,which is in good agreement with results from other theoretical approaches.展开更多
In models with vector-like quark doublets, the mass matrices of up and down type quarks are related.Precise diagonalization of the mass matrices has become an obstacle in numerical studies. In this work we first propo...In models with vector-like quark doublets, the mass matrices of up and down type quarks are related.Precise diagonalization of the mass matrices has become an obstacle in numerical studies. In this work we first propose a diagonalization method. As its application, in the Standard Model with one vector-like quark doublet we present the quark mass spectrum and Feynman rules for the calculation of B → X_sγ. We find that i) under the constraints of the CKM matrix measurements, the mass parameters in the bilinear term are constrained to a small value by the small deviation from unitarity; ii) compared with the fourth generation extension of the Standard Model, there is an enhancement to the B → X_sγ process in the contribution of vector-like quarks, resulting in a non-decoupling effect in such models.展开更多
Several recent CLEO-c results on hadronic decays of charm mesons are reviewed.Topics include measurements of precision branching fractions for exclusive modes,investigations of inclusive rates,and analyses of Dalitz p...Several recent CLEO-c results on hadronic decays of charm mesons are reviewed.Topics include measurements of precision branching fractions for exclusive modes,investigations of inclusive rates,and analyses of Dalitz plots.In addition,the quantum correlations of the D pairs produced at the ψ(3770) are exploited to measure phase information that is of current interest for both D and B physics.展开更多
We extend the T violating model of the paper on 'Hidden symmetry of the CKM and neutrinomapping matrices' by assuming its T-violating phases χ↑ and χ↓ to be large and the same, with χ=χ↑ =χ↓. In this ...We extend the T violating model of the paper on 'Hidden symmetry of the CKM and neutrinomapping matrices' by assuming its T-violating phases χ↑ and χ↓ to be large and the same, with χ=χ↑ =χ↓. In this case, the model has 9 real parameters: α↑, β↑, ξ↑, η↑ for the ↑-quark sector, α↓, β↓, ξ↓, η↓ for the ↓ sector and a common χ. We examine whether these nine parameters are compatible with ten observables: the six quark masses and the four real parameters that characterize the CKM matrix (i.e., the Jarlskog invariant J and three Eulerian angles). We find that this is possible only if the T violating phase χ is large, between -120° to -135°. In this strong T violating model, the smallness of the Jarlskog invariant J =～ 3×10-5 is mainly accounted for by the large heavy quark masses, with mc/mt < ms /mb≈ 0.02, as well as the near complete overlap of t and b quark, with (c|b)=-0.04.展开更多
We present the physics program of the open charm and heavy c states above the DD production energy threshold,which will be studied with the BES-Ⅲ detector at the BEPC-Ⅱ collider in the coming years.Based on some f...We present the physics program of the open charm and heavy c states above the DD production energy threshold,which will be studied with the BES-Ⅲ detector at the BEPC-Ⅱ collider in the coming years.Based on some full Monte Carlo simulations with the BES-Ⅲ detector,we predict the accuracy levels on measuring some physical quantities related to D0,D+ and D+s decays as well as some non-charmed decays of the heavy c states.展开更多
文摘We show that the model of discrete spaces that we have proposed in previous contributions gives a comprehensive and detailed interpretation of the properties of the standard model of particles. Moreover the model also suggests the possible existence of a non-standard family of particles.
文摘In this manuscript, we present an explicit way to describe the violation of CP symmetry in the standard model (SM) of electrweak interactions. In such a way, complex Cabbibo-Kobayashi-Maskawa (CKM) matrices are achieved which stand for the violation of CP symmetry. At the beginning, two necessary but not sufficient conditions for yielding a complex CKM matrix are stated as criteria. Then we found an interesting condition between the real and imaginary parts of a Hermitian 3 × 3 matrix which may provide extra relations among its parameters and reduce the number of them from eighteen down to five. In previous investigations, this can be done only down to nine. With another assumption among some of those parameters, the mass-matrix pattern is further simplified so as to be diagonalized analytically and in consequence four matrices which reveal S<sub>N</sub> symmetries among or between quark generations are obtained. In some of such S<sub>N</sub>-symmetric cases, the derived CKM matrices are complex which indicate that CP symmetry is violated accordingly. Taking the Jarlskog invariant as an estimate of the CPV strength, the value predicted by this model is orders stronger than the empirical value detected experimentally. However, that happens to fill partly the gap between the cosmologically observed amount of Baryon Asymmetry of the Universe (BAU) and that current Standard Model of particle physics predicts. It also proves the long suspected existence of BAU-productive eras in early universe if some fermions were indistinguishable, <em>i.e.</em>, S<sub>N</sub>-symmetric, under circumstances with extremely high temperatures.
基金Supported in part by Natural Science Foundation of China(11735010,U2032102,11653003,12005130,11521505,12070131001,11975127,11935017,12005130,12125503)Natural Science Foundation of Shanghai(15DZ2272100)+5 种基金the China Postdoctoral Science Foundation and the National Postdoctoral Program for Innovative Talents(BX20190207)National Key Research and Development Program of China(2020YFA0406400)Jiangsu Specially Appointed Professor Programthe Strategic Priority Research Program of Chinese Academy of Sciences(XDB34030300,XDPB15)a NSFC-DFG joint grant(12061131006,SCHA 458/22)Chinese Academy of Science CAS Strategic Priority Research Program of Chinese Academy of Sciences(XDC01040100)。
文摘While the standard model is the most successful theory to describe all the interactions and constituents of elementary particle physics,it has been constantly scrutinized for over four decades.Weak decays of charm quarks can be used to measure the coupling strength between quarks in different families and serve as an ideal probe for CP violation.As the lowest charm-strange baryons with three different flavors,Ξ;baryons(composed of csu or csd)have been extensively studied in experiments.In this study,we use state-of-the-art lattice QCD techniques to generate 2+1 clover fermion ensembles with two lattice spacings,a=(0.108,0.080 fm).Then,we present the first ab-initio lattice QCD calculation of the Ξ;→Ξ form factors.Our theoretical results for the Ξc→Ξl;v;decay widths are consistent with and approximately two times more precise than the latest measurements by the ALICE and Belle collaborations.Based on the latest experimental measurements,we independently obtain the quark-mixing matrix element |V;|,which is in good agreement with results from other theoretical approaches.
基金Supported by Natural Science Foundation of China(11375001)Talents Foundation of Education Department of Beijing
文摘In models with vector-like quark doublets, the mass matrices of up and down type quarks are related.Precise diagonalization of the mass matrices has become an obstacle in numerical studies. In this work we first propose a diagonalization method. As its application, in the Standard Model with one vector-like quark doublet we present the quark mass spectrum and Feynman rules for the calculation of B → X_sγ. We find that i) under the constraints of the CKM matrix measurements, the mass parameters in the bilinear term are constrained to a small value by the small deviation from unitarity; ii) compared with the fourth generation extension of the Standard Model, there is an enhancement to the B → X_sγ process in the contribution of vector-like quarks, resulting in a non-decoupling effect in such models.
基金Supported by U.S. Dept. of Energy and the U.S. National Science Foundation
文摘Several recent CLEO-c results on hadronic decays of charm mesons are reviewed.Topics include measurements of precision branching fractions for exclusive modes,investigations of inclusive rates,and analyses of Dalitz plots.In addition,the quantum correlations of the D pairs produced at the ψ(3770) are exploited to measure phase information that is of current interest for both D and B physics.
基金Supported in part by the U.S. Department of Energy (DE-FG02-92-ER40699)
文摘We extend the T violating model of the paper on 'Hidden symmetry of the CKM and neutrinomapping matrices' by assuming its T-violating phases χ↑ and χ↓ to be large and the same, with χ=χ↑ =χ↓. In this case, the model has 9 real parameters: α↑, β↑, ξ↑, η↑ for the ↑-quark sector, α↓, β↓, ξ↓, η↓ for the ↓ sector and a common χ. We examine whether these nine parameters are compatible with ten observables: the six quark masses and the four real parameters that characterize the CKM matrix (i.e., the Jarlskog invariant J and three Eulerian angles). We find that this is possible only if the T violating phase χ is large, between -120° to -135°. In this strong T violating model, the smallness of the Jarlskog invariant J =～ 3×10-5 is mainly accounted for by the large heavy quark masses, with mc/mt < ms /mb≈ 0.02, as well as the near complete overlap of t and b quark, with (c|b)=-0.04.
基金Supported by National Natural Science Foundation of China (10935007)National Key Basic Research Program (973 by MOST) (2009CB825200XX)
文摘We present the physics program of the open charm and heavy c states above the DD production energy threshold,which will be studied with the BES-Ⅲ detector at the BEPC-Ⅱ collider in the coming years.Based on some full Monte Carlo simulations with the BES-Ⅲ detector,we predict the accuracy levels on measuring some physical quantities related to D0,D+ and D+s decays as well as some non-charmed decays of the heavy c states.
