We consider the lepton-flavor violating (LFV) processes li → ljγ in the framework of topcolor-assistedtechnicolor (TC2) models. We find that the new gauge boson Z' predicted by TC2 models can give significantlyc...We consider the lepton-flavor violating (LFV) processes li → ljγ in the framework of topcolor-assistedtechnicolor (TC2) models. We find that the new gauge boson Z' predicted by TC2 models can give significantlycontributions to these processes via the flavor-changing couplings Z'lilj. The present experimental bound on the LFVprocess μ→ eγ gives severe constraints on the TC2 models. Using other experimental constraints on the Z' mass Mz,we obtain constraints on the lepton mixing factors KTμ and KTe. The future LFV experiments will probe into TC2models.展开更多
Bosonic part of SU(2)L U(1)Y effective chiral Lagrangian for electroweak symmetry breaking is derived from an underlying technicolor theory with no approximation. The underlying theory is assumed to be the most genera...Bosonic part of SU(2)L U(1)Y effective chiral Lagrangian for electroweak symmetry breaking is derived from an underlying technicolor theory with no approximation. The underlying theory is assumed to be the most general gauge theory without fundamental scalars. A condensate is required to exist in the theory which breaks SU(2)L U(1)Y dynamically to U(1)em and the anomaly of the theory caused by gauge interaction must be cancelled. The formulation offers general definitions in terms of underlying theory for the low energy constants in effective chiral Lagrangian.展开更多
Applying perturbative QCD, we study the process Bc → Dsγ in the technicolor with a massless scalar doublet model (TCMLSM). There are mainly two mechanisms contributing to the Bc → D*sγ process. One proceeds throug...Applying perturbative QCD, we study the process Bc → Dsγ in the technicolor with a massless scalar doublet model (TCMLSM). There are mainly two mechanisms contributing to the Bc → D*sγ process. One proceeds through the short distance b → sγ transition and the other through weak annihilation accompanied by a photon emission.We find that, compared with the standard model, the modification of Bc → D*sγ from πρ (the physical pions in the TCMLSM) is so small that can be neglected for the allowed mass ofπρ. The weak-annihilation contribution is found to be about one order larger than that of the electromagnetic penguin diagrams.展开更多
In the framework of topcolor-assisted technicolor model we calculate the contributions from the pseudo Goldstone bosons and new gauge bosons to . We find that for reasonable ranges of the parameters, the pseudo Goldst...In the framework of topcolor-assisted technicolor model we calculate the contributions from the pseudo Goldstone bosons and new gauge bosons to . We find that for reasonable ranges of the parameters, the pseudo Goldstone bosons afford dominate contribution, the correction arising from new gauge bosons is negligibly small, the maximum of the relative corrections is with the center-of-mass energy ; whereas in the case of , the relative corrections could be up to 16%. Thus large new physics might be observable at the experiments of next-generation linear colliders.展开更多
In the framework of topcolor-assisted technicolor （TC2） model, there exist tree-level flavor-changing （FC） couplings, which can result in the loop-level FC coupling tcg. Such tcg coupling can contribute significan...In the framework of topcolor-assisted technicolor （TC2） model, there exist tree-level flavor-changing （FC） couplings, which can result in the loop-level FC coupling tcg. Such tcg coupling can contribute significant clues at the forthcoming Large Hadron Collider （LHC） experiments. In this paper, based on the TC2 model, we study some single t-quark production processes involving tcg coupling at the Tevatron and LHC： pp（pp） → tq （q = u, d, s）, tg. We calculate the cross sections of these processes. The results show that the cross sections at the Tevatron are too small to observe the signal, but at the LHC it can reach a few pb. With the high luminosity, the LHC has considerable capability to find the single t-quark signal produced via some FC processes involving coupling tcg. On the other hand, these processes can also provide some valuable information of the coupling tcg with detailed study of the processes and furthermore provide the reliable evidence to test the TC2 model展开更多
ICTC2011期间，中国有线网络双向接入产业联盟（BiCA，Broadband and Interactive Cable Alliance）宣布将推动WiFi降频技术标准向BiCA3．0迈进。BiCA联盟核心成员Technicolor特艺集团表示，在三网融合不断深入的背景下，Technicolor特...ICTC2011期间，中国有线网络双向接入产业联盟（BiCA，Broadband and Interactive Cable Alliance）宣布将推动WiFi降频技术标准向BiCA3．0迈进。BiCA联盟核心成员Technicolor特艺集团表示，在三网融合不断深入的背景下，Technicolor特艺集团将继续带动BiCA联盟进行技术升级，推动技术标准统一，加强产品互联互通。展开更多
2011年10月18-21日,在西安举行的ICTC2011会议期间,中国有线网络双向接入产业联盟（BiCA,Broadband and Interactive Cable Alliance）宣布将推动WiFi降频技术标准向BiCA3.0迈进。BiCA联盟核心成员Technicolor特艺集团表示,在三网融合...2011年10月18-21日,在西安举行的ICTC2011会议期间,中国有线网络双向接入产业联盟（BiCA,Broadband and Interactive Cable Alliance）宣布将推动WiFi降频技术标准向BiCA3.0迈进。BiCA联盟核心成员Technicolor特艺集团表示,在三网融合不断深入的背景下,Technicolor特艺集团将继续带动BiCA联盟进行技术升级,推动技术标准统一,加强产品互联互通。展开更多
We consider the contributions of the extra gauge boson Z＇ to the like sign ^- production processes e-＇γ→e＋（μ＋）τ-τ-, induced by the tree-level flavor changing interactions. Since these rare production are fa...We consider the contributions of the extra gauge boson Z＇ to the like sign ^- production processes e-＇γ→e＋（μ＋）τ-τ-, induced by the tree-level flavor changing interactions. Since these rare production are far below the observable level in the Standard Model and other popular new physics models such as the minimal supersymmetric model, we find that, in the topcolor-assisted technicolor models, the Z＇ can give significant contributions to these processes, and with reasonable values of the parameters, the cross section cr can reach several tens of tb and may be detected at the eγ collisions.展开更多
The topcolor-assisted technicolor （TC2） model predicts a number of neutral scalars like the top-pion （πt^0） and the top-Higgs （ht^0）. These scalars have flavor-changing neutral-current （FCNC） top quark coupli...The topcolor-assisted technicolor （TC2） model predicts a number of neutral scalars like the top-pion （πt^0） and the top-Higgs （ht^0）. These scalars have flavor-changing neutral-current （FCNC） top quark couplings, among which the top-charm transition couplings may be sizable. Such FCNC couplings induce single top productions associated with a neutral scalar at the CERN Large Hadron Collider （LHC） through the parton processes cg→ tπt^0 and cg→ tht^0. In this paper we examine these productions and find their production rates can exceed the 3σ sensitivity of the LHC in a large part of parameter space. Since in the Standard Model and the minimal supersymmetric model such rare productions have unobservably small production rates at the LHC, these rare processes will serve as a good probe for the TC2 model.展开更多
文摘We consider the lepton-flavor violating (LFV) processes li → ljγ in the framework of topcolor-assistedtechnicolor (TC2) models. We find that the new gauge boson Z' predicted by TC2 models can give significantlycontributions to these processes via the flavor-changing couplings Z'lilj. The present experimental bound on the LFVprocess μ→ eγ gives severe constraints on the TC2 models. Using other experimental constraints on the Z' mass Mz,we obtain constraints on the lepton mixing factors KTμ and KTe. The future LFV experiments will probe into TC2models.
文摘Bosonic part of SU(2)L U(1)Y effective chiral Lagrangian for electroweak symmetry breaking is derived from an underlying technicolor theory with no approximation. The underlying theory is assumed to be the most general gauge theory without fundamental scalars. A condensate is required to exist in the theory which breaks SU(2)L U(1)Y dynamically to U(1)em and the anomaly of the theory caused by gauge interaction must be cancelled. The formulation offers general definitions in terms of underlying theory for the low energy constants in effective chiral Lagrangian.
文摘Applying perturbative QCD, we study the process Bc → Dsγ in the technicolor with a massless scalar doublet model (TCMLSM). There are mainly two mechanisms contributing to the Bc → D*sγ process. One proceeds through the short distance b → sγ transition and the other through weak annihilation accompanied by a photon emission.We find that, compared with the standard model, the modification of Bc → D*sγ from πρ (the physical pions in the TCMLSM) is so small that can be neglected for the allowed mass ofπρ. The weak-annihilation contribution is found to be about one order larger than that of the electromagnetic penguin diagrams.
文摘In the framework of topcolor-assisted technicolor model we calculate the contributions from the pseudo Goldstone bosons and new gauge bosons to . We find that for reasonable ranges of the parameters, the pseudo Goldstone bosons afford dominate contribution, the correction arising from new gauge bosons is negligibly small, the maximum of the relative corrections is with the center-of-mass energy ; whereas in the case of , the relative corrections could be up to 16%. Thus large new physics might be observable at the experiments of next-generation linear colliders.
基金The project supported by National Natural Science Foundation of China under Grant Nos.10375017,10575029,and 10575052
文摘In the framework of topcolor-assisted technicolor （TC2） model, there exist tree-level flavor-changing （FC） couplings, which can result in the loop-level FC coupling tcg. Such tcg coupling can contribute significant clues at the forthcoming Large Hadron Collider （LHC） experiments. In this paper, based on the TC2 model, we study some single t-quark production processes involving tcg coupling at the Tevatron and LHC： pp（pp） → tq （q = u, d, s）, tg. We calculate the cross sections of these processes. The results show that the cross sections at the Tevatron are too small to observe the signal, but at the LHC it can reach a few pb. With the high luminosity, the LHC has considerable capability to find the single t-quark signal produced via some FC processes involving coupling tcg. On the other hand, these processes can also provide some valuable information of the coupling tcg with detailed study of the processes and furthermore provide the reliable evidence to test the TC2 model
文摘ICTC2011期间，中国有线网络双向接入产业联盟（BiCA，Broadband and Interactive Cable Alliance）宣布将推动WiFi降频技术标准向BiCA3．0迈进。BiCA联盟核心成员Technicolor特艺集团表示，在三网融合不断深入的背景下，Technicolor特艺集团将继续带动BiCA联盟进行技术升级，推动技术标准统一，加强产品互联互通。
文摘2011年10月18-21日,在西安举行的ICTC2011会议期间,中国有线网络双向接入产业联盟（BiCA,Broadband and Interactive Cable Alliance）宣布将推动WiFi降频技术标准向BiCA3.0迈进。BiCA联盟核心成员Technicolor特艺集团表示,在三网融合不断深入的背景下,Technicolor特艺集团将继续带动BiCA联盟进行技术升级,推动技术标准统一,加强产品互联互通。
文摘We consider the contributions of the extra gauge boson Z＇ to the like sign ^- production processes e-＇γ→e＋（μ＋）τ-τ-, induced by the tree-level flavor changing interactions. Since these rare production are far below the observable level in the Standard Model and other popular new physics models such as the minimal supersymmetric model, we find that, in the topcolor-assisted technicolor models, the Z＇ can give significant contributions to these processes, and with reasonable values of the parameters, the cross section cr can reach several tens of tb and may be detected at the eγ collisions.
文摘The topcolor-assisted technicolor （TC2） model predicts a number of neutral scalars like the top-pion （πt^0） and the top-Higgs （ht^0）. These scalars have flavor-changing neutral-current （FCNC） top quark couplings, among which the top-charm transition couplings may be sizable. Such FCNC couplings induce single top productions associated with a neutral scalar at the CERN Large Hadron Collider （LHC） through the parton processes cg→ tπt^0 and cg→ tht^0. In this paper we examine these productions and find their production rates can exceed the 3σ sensitivity of the LHC in a large part of parameter space. Since in the Standard Model and the minimal supersymmetric model such rare productions have unobservably small production rates at the LHC, these rare processes will serve as a good probe for the TC2 model.
