This paper is the extension of our previous work entitled''Searching a systematics for nonfactorizable contributions to B and B^(0)hadronic decays''.Obtaining the factorizable contributions from the sp...This paper is the extension of our previous work entitled''Searching a systematics for nonfactorizable contributions to B and B^(0)hadronic decays''.Obtaining the factorizable contributions from the spectator-quark model for Nc=3,a systematics was identified among the isospin reduced amplitudes for the nonfactorizable terms amongB→Dπ/D^(∗)π/Dρdecay modes.This systematics enables us to derive a generic formula to help predict the branching fractions forB^(0)−decays.Inspired by this observation,we extend our analysis to p-wave meson emitting decays of B−mesonB→PA/PT/PS,particularlyB→a_(1)D/πD_(1)/πD′1/πD_(2)/πD_(0),which have similar isospin structures and make predictions forB^(0)−decays,for which experimental measurements are not yet available.展开更多
The matter-antimatter asymmetry observed in nature is one of the biggest mysteries in physics,and the resolution of this puzzle could be one of the necessary paths to identifying the ultimate theory of the universe.Th...The matter-antimatter asymmetry observed in nature is one of the biggest mysteries in physics,and the resolution of this puzzle could be one of the necessary paths to identifying the ultimate theory of the universe.The violation of the combined charge-conjugation and parity(CP)symmetry is one of the required ingredients for explaining this asymmetry[1].展开更多
This paper presents a systematic study of hyperon non-leptonic two-body decays induced by light quark transitions,particularly the s→ud process,within the framework of SU(3)flavor symmetry.The effective weak Hamilton...This paper presents a systematic study of hyperon non-leptonic two-body decays induced by light quark transitions,particularly the s→ud process,within the framework of SU(3)flavor symmetry.The effective weak Hamiltonian is decomposed into irreducible SU(3)representations,including the 27-plet and octet components,and applied to analyze decays of octet and decuplet baryons and charmed baryons.Both the irreducible representation amplitude(IRA)approach and the topological diagrammatic analysis(TDA)are employed to construct decay amplitudes and constrain the parameter space.SU(3)symmetry-breaking effects arising from the strange quark mass are incorporated systematically.A global fit to current experimental data allows us to extract form factors and predict branching ratios and asymmetry parameters for several decay channels.Our results demonstrate the predictive power of SU(3)flavor symmetry while highlighting significant symmetry-breaking effects,especially in amplitudes related to the 27-plet.Notably,theΣ+→pπ^(0)decay channel exhibits a deviation exceeding lofrom experimental measurements,suggesting the possible presence of new decay mechanisms or contributions beyond the Standard Model.Besides,we also evaluate the size of symmetry breaking.However,the large uncertainty of the experimental data makes it difficult to precisely determine the value of symmetry breaking.We strongly recommend that future experimental efforts aim to reduce the measurement uncertainties,especially for the processes^(0)→pπ^(-)andΛ^(0)→nπ^(0),which have larger experimental errors compared to other data and play an important role in determining the symmetry breaking parameter.This study provides a systematic framework for future tests of the Standard Model and the search for new physics in hyperon decays.展开更多
Weak radiative hyperon decays,important to test the strong interaction and relevant in searches for beyond the standard model physics,have remained puzzling both experimentally and theoretically for a long time.The re...Weak radiative hyperon decays,important to test the strong interaction and relevant in searches for beyond the standard model physics,have remained puzzling both experimentally and theoretically for a long time.The recently updated branching fraction and first measurement of the asymmetry parameter of Λ→nγ by the BESIII Collaboration further exacerbate the issue,as none of the existing predictions can describe the data.We show in this work that the covariant baryon chiral perturbation theory,with constraints from the latest measurements of hyperon non-leptonic decays,can well describe the BESIII data.The predicted branching fraction and asymmetry parameter for Ξ→Σγ are also in agreement with the experimental data.We note that a more precise measurement of the asymmetry parameter,which is strongly constrained by chiral symmetry and related with that of Σ→pγ,is crucial to test Hara’s theorem.We further predict the branching fraction and asymmetry parameter of Σ~0→nγ,whose future measurement can serve as a highly nontrivial check on our understanding of weak radiative hyperon decays and on the covariant baryon chiral perturbation theory.展开更多
The two-body weak decays B→πD/B→ρD and B→πD are examined using isospin analysis to study nonfactorizable contributions.After determining strong interaction phases and obtaining factorizable contributions from sp...The two-body weak decays B→πD/B→ρD and B→πD are examined using isospin analysis to study nonfactorizable contributions.After determining strong interaction phases and obtaining factorizable contributions from spectator-quark diagrams for Nc=3,we determine nonfactorizable isospin amplitudes from the experimental data for these modes.Our results support the universality of the ratio of nonfactorizable isospin reduced amplitudes for these decays within experimental errors.To demonstrate that these systematics are not coincidental,we also plot our results w.r.t.this ratio.展开更多
文摘This paper is the extension of our previous work entitled''Searching a systematics for nonfactorizable contributions to B and B^(0)hadronic decays''.Obtaining the factorizable contributions from the spectator-quark model for Nc=3,a systematics was identified among the isospin reduced amplitudes for the nonfactorizable terms amongB→Dπ/D^(∗)π/Dρdecay modes.This systematics enables us to derive a generic formula to help predict the branching fractions forB^(0)−decays.Inspired by this observation,we extend our analysis to p-wave meson emitting decays of B−mesonB→PA/PT/PS,particularlyB→a_(1)D/πD_(1)/πD′1/πD_(2)/πD_(0),which have similar isospin structures and make predictions forB^(0)−decays,for which experimental measurements are not yet available.
基金supported by the National Key R&D Program of China(2023YFA1609400,2020YFA0406400,and 2023YFA1606000)the National Natural Science Foundation of China(11935018,12221005,12422504,12105127,and 124B2097)the Fundamental Research Funds for the Central Universities,Lanzhou University(lzujbky-2021-ey09 and lzujbky-2023-it32).
文摘The matter-antimatter asymmetry observed in nature is one of the biggest mysteries in physics,and the resolution of this puzzle could be one of the necessary paths to identifying the ultimate theory of the universe.The violation of the combined charge-conjugation and parity(CP)symmetry is one of the required ingredients for explaining this asymmetry[1].
基金NSFC(12322503,12075124)the Natural Science Foundation of Jiangsu(BK20211267)+1 种基金NSFC(12375088,12335003,12405113)NSFC(12005294)。
文摘This paper presents a systematic study of hyperon non-leptonic two-body decays induced by light quark transitions,particularly the s→ud process,within the framework of SU(3)flavor symmetry.The effective weak Hamiltonian is decomposed into irreducible SU(3)representations,including the 27-plet and octet components,and applied to analyze decays of octet and decuplet baryons and charmed baryons.Both the irreducible representation amplitude(IRA)approach and the topological diagrammatic analysis(TDA)are employed to construct decay amplitudes and constrain the parameter space.SU(3)symmetry-breaking effects arising from the strange quark mass are incorporated systematically.A global fit to current experimental data allows us to extract form factors and predict branching ratios and asymmetry parameters for several decay channels.Our results demonstrate the predictive power of SU(3)flavor symmetry while highlighting significant symmetry-breaking effects,especially in amplitudes related to the 27-plet.Notably,theΣ+→pπ^(0)decay channel exhibits a deviation exceeding lofrom experimental measurements,suggesting the possible presence of new decay mechanisms or contributions beyond the Standard Model.Besides,we also evaluate the size of symmetry breaking.However,the large uncertainty of the experimental data makes it difficult to precisely determine the value of symmetry breaking.We strongly recommend that future experimental efforts aim to reduce the measurement uncertainties,especially for the processes^(0)→pπ^(-)andΛ^(0)→nπ^(0),which have larger experimental errors compared to other data and play an important role in determining the symmetry breaking parameter.This study provides a systematic framework for future tests of the Standard Model and the search for new physics in hyperon decays.
基金supported in part by the National Natural Science Foundation of China (11735003, 11975041, and11961141004)support from the National Natural Science Foundation of China (12147145)+2 种基金support from the National Natural Science Foundation of China (12105006)Project funded by China Postdoctoral Science Foundation (2021M700343)China Postdoctoral Science Foundation (2021M690008)
文摘Weak radiative hyperon decays,important to test the strong interaction and relevant in searches for beyond the standard model physics,have remained puzzling both experimentally and theoretically for a long time.The recently updated branching fraction and first measurement of the asymmetry parameter of Λ→nγ by the BESIII Collaboration further exacerbate the issue,as none of the existing predictions can describe the data.We show in this work that the covariant baryon chiral perturbation theory,with constraints from the latest measurements of hyperon non-leptonic decays,can well describe the BESIII data.The predicted branching fraction and asymmetry parameter for Ξ→Σγ are also in agreement with the experimental data.We note that a more precise measurement of the asymmetry parameter,which is strongly constrained by chiral symmetry and related with that of Σ→pγ,is crucial to test Hara’s theorem.We further predict the branching fraction and asymmetry parameter of Σ~0→nγ,whose future measurement can serve as a highly nontrivial check on our understanding of weak radiative hyperon decays and on the covariant baryon chiral perturbation theory.
文摘The two-body weak decays B→πD/B→ρD and B→πD are examined using isospin analysis to study nonfactorizable contributions.After determining strong interaction phases and obtaining factorizable contributions from spectator-quark diagrams for Nc=3,we determine nonfactorizable isospin amplitudes from the experimental data for these modes.Our results support the universality of the ratio of nonfactorizable isospin reduced amplitudes for these decays within experimental errors.To demonstrate that these systematics are not coincidental,we also plot our results w.r.t.this ratio.
