The massless dark photon~γ can only interact with the Standard Model(SM)sector via higherdimensional operators.In this letter,we investigate its production associated with the ordinary photonγfrom the lepton flavor ...The massless dark photon~γ can only interact with the Standard Model(SM)sector via higherdimensional operators.In this letter,we investigate its production associated with the ordinary photonγfrom the lepton flavor violation(LFV)process l_(i)→l_(j)γγ and di-production from the LFV process l_(i)→l_(j)γγ induced by dipole operators.Comparing the obtained numerical results with the corresponding experimental measurements,we obtain the constraints on the effective couplings of γ with the SM charged leptons.The upper limit of the effective coupling|DLμe|2+|DRμe|2coming from the process μ→e~γγis looser than the processμ→eγ by about one order of magnitude.展开更多
The T-parity in the littlest Higgs model can be broken by the anomalous Wess-Zumin-Witten term, which leads that the lightest T-odd gauge boson AH decays into the SM particles. First, we examine some lepton flavor vio...The T-parity in the littlest Higgs model can be broken by the anomalous Wess-Zumin-Witten term, which leads that the lightest T-odd gauge boson AH decays into the SM particles. First, we examine some lepton flavor violating decays of AH, namely AH → τ±μ±, AH→ τ±e±, and AH→ τ±e±. We find that the branching ratios can reach 10-7 for AH → τ±μ±, 10-s for AH → τ±μ±, and 10-s for AH → τ±e± Then, we study the lepton flavor violating plus jets signatures of the heavy charged gauge boson and mirror quarks at the LHC, and find that it is possible to be detected for pp jets, and hardly to be detected for pp → τ±e± （μ±e±） ＋ 4 jets and p p → W H W H → τ±μ±（ τ±e±,μ±e±） ＋ 6 jets.展开更多
We investigate the lepton flavor violating productions pp/pp→eμ ＋ X in the framework of the R-parity violating （RPV） supersymmetric model at the Tevatron and the CERN large hadron collider （LHC）. We present the...We investigate the lepton flavor violating productions pp/pp→eμ ＋ X in the framework of the R-parity violating （RPV） supersymmetric model at the Tevatron and the CERN large hadron collider （LHC）. We present the total cross sections including the next-to-leading order （NLO） QCD corrections and the contribution from gluon-gluon fusion subprocess. Our numerical results show that the one-loop QCD corrections significantly increase the tree-level cross sections, and the variation of K factor is in the range between 1.28 （1.32） and 1.79 （1.58） at the Tevatron （LHC）. We find that the QCD correction from the one-loop gluon-gluon fusion subprocess is remarkable at the LHC and should be taken into account.展开更多
Humor not only exists in people's daily life,but also through sketch,cross talk talk show,stand-up Comedy and other forms of performance to bring people happy.Many scholars analyze Joe Wong's stand-up comedy f...Humor not only exists in people's daily life,but also through sketch,cross talk talk show,stand-up Comedy and other forms of performance to bring people happy.Many scholars analyze Joe Wong's stand-up comedy from the Relevance Theory.But few scholars analyze it from the Cooperative Principle.Based on a review of previous studies on stand-up comedy,this thesis selects some classic utterances from stand-up comedy of Joe Wong at Radio and Television Correspondent's Association Dinner(RTCA dinner),The David Letterman Show and The Ellen Show as a research corpus and studies the humor is created from the perspective of violating of the Cooperative Principle,and then attempts to help people understanding and appreciating American humor deeply.This thesis finds violating the Cooperative Principle(CP)is an important way for talk show performers to create humor,which will help them make people laugh.Besides,during this way,they can use many rhetoric tactics to help them,such as irony,exaggeration and pun.This thesis has important significances for the study of talk show's humor with the help of flouting the CP.Firstly,it contributes to the development of the talk show performs.Secondly,it can add more interesting things to communication and help the Chinese audiences to comprehend the American humor from a different aspect.Thirdly,it riches the theories of humor by violating the CP in the talk show programs.展开更多
Humor is one of the unique ways for human beings to express their feelings.It becomes one of the important topics in pragmatic study how the human system operates.This article introduces four maxims of Gricean coopera...Humor is one of the unique ways for human beings to express their feelings.It becomes one of the important topics in pragmatic study how the human system operates.This article introduces four maxims of Gricean cooperative principle and attempts to explore how humor in Friends,an American situation comedy is caused by violation of the principle and how to interpret humor in context.It will help us to understand English humor deeply so as to improve learners' communicative ability of language.展开更多
Considering the experimental constraints on the free parameters of the 331 model with a leptonic sector consistent of five triplets, we investigate the lepton flavor violation(LFV) tau decays τ→μM with M = P and V,...Considering the experimental constraints on the free parameters of the 331 model with a leptonic sector consistent of five triplets, we investigate the lepton flavor violation(LFV) tau decays τ→μM with M = P and V,where P and V denote a pseudoscalar meson(π, η or η′) and a vector meson(ρ0, ω or φ), respectively. We find that the contributions of the 331 model to the LFV decays τ→μM mainly come from the new neutral gauge boson Z′. The 331 model considered in this paper can not make the values of the branching ratio Br(τ→μM) approach the corresponding experimental upper limits.展开更多
The top-charm associated production with the effects from both B- and L-violating interactions in TeVscale photon-proton collisions is investigated in the framework of Rp minimal supersymmetric standard model. Withint...The top-charm associated production with the effects from both B- and L-violating interactions in TeVscale photon-proton collisions is investigated in the framework of Rp minimal supersymmetric standard model. Withinthe bounds on the relevant R-parity violating couplings, the total cross section will reach the order of 10 fb in some partsof the parameter space.展开更多
The top-charm associated production with the effects from both B- and L-violating interactions in TeV scale photon-proton collisions is investigated in the framework of minimal supersymmetric standard model. Within t...The top-charm associated production with the effects from both B- and L-violating interactions in TeV scale photon-proton collisions is investigated in the framework of minimal supersymmetric standard model. Within the bounds on the relevant R-parity violating couplings, the total cross section will reach the order of 10 fb in some parts of the parameter space.展开更多
Study of neutrino properties is nowadays one of the most active domains of research in physics. On the one hand, fundamental properties of the neutrinos like their absolute mass, their character (are they Dirac or Maj...Study of neutrino properties is nowadays one of the most active domains of research in physics. On the one hand, fundamental properties of the neutrinos like their absolute mass, their character (are they Dirac or Majorana particles?) and the number of neutrino flavors, are still unknown. On the other hand, the knowledge of these properties are of great importance since the neutrinos are very abundant in nature and play a key role in nuclear and particle physics, astrophysics and cosmology. In addition, the results of the neutrino oscillation experiments have convincingly showed that neutrinos have mass and mix, in contradiction to the initial assumptions of the Standard Model. In this context there is an increased interest in the study of the Lepton Number Violating (LNV) processes, since they are capable to decide on the above mentioned neutrino properties. Since recently, the neutrinoless double beta (0nββ) decay was considered the only process able to distinguish between Dirac or Majorana neutrinos and to give a hint on the absolute mass of the electron neutrino. At present, the increased luminosity of the LHC experiments at CERN makes it feasable the search for LNV processes at LHC as well. Besides the neutrino character, these studies can also shed light on the existence of other types of neutrinos (the sterile neutrinos), than the three known ones. In this paper, I make a brief review on our present knowledge about the neutrino properties and on the way they can be probed by LNV processes at low- and high-energies. Particularly, I refer to the 0nββ decay process and to the first attempts of searching of LNV processes in hadron collider experiments, particularly in LHC experiments at CERN-Geneva.展开更多
By applying the rules for the sum of quark oscillation probabilities for the original CKM matrix and for Wolfenstein’s parameterization, equations were derived in which the CP violating phase for quarks appears as an...By applying the rules for the sum of quark oscillation probabilities for the original CKM matrix and for Wolfenstein’s parameterization, equations were derived in which the CP violating phase for quarks appears as an unknown quantity. Quark oscillations occur in spaces that are on the femtometer scale and they are unmeasurable from the point of view of experiments. However, the consequence of those oscillations is the CP violating phase for quarks, which is measured through unitary triangles in Wolfenstein’s parameterization. Through the mathematical model presented in this paper, the equation in Wolfenstein’s parameterization was derived, the root of which is consistent with measurements in today’s quark physics.展开更多
Humor is a kind of literature that can be found everywhere in our daily life. It is also a kind of language art that can be created by various reasons. This essay will analyze humor from a knowledge of pragmatics—coo...Humor is a kind of literature that can be found everywhere in our daily life. It is also a kind of language art that can be created by various reasons. This essay will analyze humor from a knowledge of pragmatics—cooperative principle (CP) and show how the humorous effect achieved ascribed to the breaking the four maxims of the cooperative principle. It also provides a lot of examples to show how to achieve humorous effect by applying Grice’s cooperative principle. The creation of humor and violation of CP have close relationship. Violating CP in the surface may create humor. A better understanding about humor will be achieved under an analysis of CP. As a linguistic phenomenon, humor has its own charm. It’s good medicine,that can improve interpersonal relationships and make others feel comfortable.展开更多
We study the CP-violating(CPV)neutral triple gauge couplings(nTGCs)that can be realized via dimension-8 operators in the Standard Model Effective Field Theory(SMEFT).We present a new formulation of the CPV nTGC form f...We study the CP-violating(CPV)neutral triple gauge couplings(nTGCs)that can be realized via dimension-8 operators in the Standard Model Effective Field Theory(SMEFT).We present a new formulation of the CPV nTGC form factors that is compat-ible with the spontaneous breaking of the electroweak gauge symmetry,and show how these CPV form factors can be matched consistently with the corresponding dimension-8 CPV nTGC operators in the broken phase.We then study probes of the CPV nTGCs at future high-energy e^(+)e^(−)colliders with centre-of-mass energies√s=0.25,0.5,1,3,5 TeV,respectively,demonstrating that the e■beam polarizations can help to improve the sensitivities of probes of the nTGCs.We estimate that the sensitivity reaches for probing the new physics scales of nTGCs can range from O(TeV)at a 250 GeV e^(+)e^(−)collider to O(10 TeV)at an e^(+)e^(−)collider of energy 3-5 TeV,and that the sensitivities to the nTGC form factors vary from O(10^(−4))to O(10^(−6)-10^(−8))for the e^(+)e^(−)collision energy from 250 GeV to 3-5 TeV.展开更多
The article[1]discusses systematically the measurement of neutral triple gauge boson couplings(nTGCs)[2-11](that violate CP symmetry)at high-energy colliders,especially at the electron-positron Higgs factories.Since d...The article[1]discusses systematically the measurement of neutral triple gauge boson couplings(nTGCs)[2-11](that violate CP symmetry)at high-energy colliders,especially at the electron-positron Higgs factories.Since direct couplings of triple neutral gauge bosons do not exist both in the dimension-4 Lagrangian of the standard model(SM)and at the dimension-6 level of the SM effective field theory(SMEFT),measuring the nTGCs can provide an effective window for searching new physics beyond the SM.Furthermore,the nTGCs can provide possible new source of CP violations beyond the Kobayashi-Maskawa(KM)mechanism[12]of the SM.Hence,measuring the CPV nTGCs is important for a better understanding of the CP violations and possibly the origin of the matter in the Universe.展开更多
The hitherto unconstrained lepton flavor mixings,induced by the new gauge boson Z ,which are the prediction of many new physics models,such as topcolor-assisted technicolor (TC2) models and flavor-universal TC2 models...The hitherto unconstrained lepton flavor mixings,induced by the new gauge boson Z ,which are the prediction of many new physics models,such as topcolor-assisted technicolor (TC2) models and flavor-universal TC2 models,may lead to the lepton flavor violating productions of τμˉ,τeˉ and μeˉ in photon-photon collision at the proposed International Linear Collider (ILC).Through a comparative analysis of these processes,we find that the better channel to probe the new physics models is the production of τμˉ or τeˉ which occurs at a much higher rate than μeˉ production due to the large mixing angle and the large flavor changing coupling,and may reach the detectable level of the ILC for a large part of the parameter space.Since the rates predicted by the Standard Model are far below the detectable level,these processes may serve as a sensitive probe for such new physics models.展开更多
We present the comaprative study of semileptonic and leptonic decays of Ds, D±and D0meson（D →M l＋-αl-β, D → l＋αlβ, D → l＋αvα;α,β=e,μ） within the framework of R-parity violating the（ Rp） Minimal...We present the comaprative study of semileptonic and leptonic decays of Ds, D±and D0meson（D →M l＋-αl-β, D → l＋αlβ, D → l＋αvα;α,β=e,μ） within the framework of R-parity violating the（ Rp） Minimal Supersymmetric Standard Model（MSSM）. The comparison shows that combination and product couplings,（λβiα λ＊ ij qor λβqkλ＊αj k）contribution to the branching fractions of the said processes（under consideration） is consistent with or comparable to the experimental measurements in most of the cases. However, some cases exist where these contributions are highly suppressed. We identify such cases in our analysis and single out the important ones suitable for exploring in the future and current experiments.展开更多
We search for a possible relationship between weak gravity conjecture(WGC)and conformal field theory(CFT)in hyperscaling violating and Kerr-Newman-AdS black holes.We deal with the critical points of the black hole sys...We search for a possible relationship between weak gravity conjecture(WGC)and conformal field theory(CFT)in hyperscaling violating and Kerr-Newman-AdS black holes.We deal with the critical points of the black hole systems using the correlation function introduced in CFT and discuss WGC conditions using the imaginary part of the energy obtained from the critical points and their poles.Under the assumptions z=1,d=1,andθ→0-,we link WGC to hyperscaling violating black holes owing to the existence of rHvalues larger and smaller than one.For the second black hole system,we study the conditions of WGC for Kerr-Newman-AdS black holes using rotation and radius parameters.Then,we show that the conditions of WGC are satisfied when the charged particle near the hyperscaling violating and Kerr-Newman black holes is 1/a with a ratio a/l《1.展开更多
In this study,we analyze the rare decays of the neutral vector mesons J/ψ and Υ(nS)in the scenario of the minimal R-symmetric supersymmetric standard model using the effective Lagrangian method.The predicted branchi...In this study,we analyze the rare decays of the neutral vector mesons J/ψ and Υ(nS)in the scenario of the minimal R-symmetric supersymmetric standard model using the effective Lagrangian method.The predicted branching ratios are dominated by the mass insertion parameters δ^(ij),i.e.,the off-diagonal inputs,and the contributions of different parts are comparable.Taking into account the experimental constraints on the mass insertion parameters,the predicted branching ratios for the most promising processes Υ(nS)→lτ are ten orders of magnitude smaller than the present experimental bounds.展开更多
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...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.展开更多
We discuss possible implications of exotic stringy instantons for baryon-violating signatures in future colliders. In particular, we discuss high-energy quark collisions and A- transitions. In principle, the A-A proce...We discuss possible implications of exotic stringy instantons for baryon-violating signatures in future colliders. In particular, we discuss high-energy quark collisions and A- transitions. In principle, the A-A process can be probed by high-luminosity electron-positron colliders. However, we find that an extremely high luminosity is needed in order to provide a （somewhat） stringent bound compared to the current data on NN→ππ,KK. On the other hand, （exotic） instanton-induced six-quark interactions can be tested in near future high-energy colliders beyond LHC, at energies around 20-100 TeV. The Super proton-proton Collider （SppC） would be capable of such measurement given the proposed energy level of 50-90 TeV. Comparison with other channels is made. In particular, we show the compatibility of our model with neutron-antineutron and NN→ππ, KK bounds.展开更多
In the supersymmetric left-right model, the light neutrino masses are given by the Type-seesaw mechanism. A duality property of this mechanism indicates that there exist eight possible Higgs triplet Yukawa couplings w...In the supersymmetric left-right model, the light neutrino masses are given by the Type-seesaw mechanism. A duality property of this mechanism indicates that there exist eight possible Higgs triplet Yukawa couplings which result in the same neutrino mass matrix. In this paper, we work out the one-loop renormalization group equations for the effective neutrino mass matrix in the supersymmetric left-right model. The stability of the Typeseesaw scenario is briefly discussed. We also study the lepton-flavor-violating processes （τ → μγ and τ → eγ） by using the reconstructed Higgs triplet Yukawa couplings.展开更多
基金supported in part by the National Natural Science Foundation of China under Grant Nos.11875157,12147214the Doctoral Start-up Fund of Liaoning Normal University under Grant No.2024BSL018the Universitylevel National Research Project Cultivation Program under Grant No.2024170。
文摘The massless dark photon~γ can only interact with the Standard Model(SM)sector via higherdimensional operators.In this letter,we investigate its production associated with the ordinary photonγfrom the lepton flavor violation(LFV)process l_(i)→l_(j)γγ and di-production from the LFV process l_(i)→l_(j)γγ induced by dipole operators.Comparing the obtained numerical results with the corresponding experimental measurements,we obtain the constraints on the effective couplings of γ with the SM charged leptons.The upper limit of the effective coupling|DLμe|2+|DRμe|2coming from the process μ→e~γγis looser than the processμ→eγ by about one order of magnitude.
基金Supported in part by the National Natural Science Foundation of China under Grant Nos.11005089 and 11105116by the Foundation of Yantai University under Grant Nos.WL10B24 and WL09B31
文摘The T-parity in the littlest Higgs model can be broken by the anomalous Wess-Zumin-Witten term, which leads that the lightest T-odd gauge boson AH decays into the SM particles. First, we examine some lepton flavor violating decays of AH, namely AH → τ±μ±, AH→ τ±e±, and AH→ τ±e±. We find that the branching ratios can reach 10-7 for AH → τ±μ±, 10-s for AH → τ±μ±, and 10-s for AH → τ±e± Then, we study the lepton flavor violating plus jets signatures of the heavy charged gauge boson and mirror quarks at the LHC, and find that it is possible to be detected for pp jets, and hardly to be detected for pp → τ±e± （μ±e±） ＋ 4 jets and p p → W H W H → τ±μ±（ τ±e±,μ±e±） ＋ 6 jets.
基金The project supported in part by National Natural Science Foundation of China
文摘We investigate the lepton flavor violating productions pp/pp→eμ ＋ X in the framework of the R-parity violating （RPV） supersymmetric model at the Tevatron and the CERN large hadron collider （LHC）. We present the total cross sections including the next-to-leading order （NLO） QCD corrections and the contribution from gluon-gluon fusion subprocess. Our numerical results show that the one-loop QCD corrections significantly increase the tree-level cross sections, and the variation of K factor is in the range between 1.28 （1.32） and 1.79 （1.58） at the Tevatron （LHC）. We find that the QCD correction from the one-loop gluon-gluon fusion subprocess is remarkable at the LHC and should be taken into account.
文摘Humor not only exists in people's daily life,but also through sketch,cross talk talk show,stand-up Comedy and other forms of performance to bring people happy.Many scholars analyze Joe Wong's stand-up comedy from the Relevance Theory.But few scholars analyze it from the Cooperative Principle.Based on a review of previous studies on stand-up comedy,this thesis selects some classic utterances from stand-up comedy of Joe Wong at Radio and Television Correspondent's Association Dinner(RTCA dinner),The David Letterman Show and The Ellen Show as a research corpus and studies the humor is created from the perspective of violating of the Cooperative Principle,and then attempts to help people understanding and appreciating American humor deeply.This thesis finds violating the Cooperative Principle(CP)is an important way for talk show performers to create humor,which will help them make people laugh.Besides,during this way,they can use many rhetoric tactics to help them,such as irony,exaggeration and pun.This thesis has important significances for the study of talk show's humor with the help of flouting the CP.Firstly,it contributes to the development of the talk show performs.Secondly,it can add more interesting things to communication and help the Chinese audiences to comprehend the American humor from a different aspect.Thirdly,it riches the theories of humor by violating the CP in the talk show programs.
文摘Humor is one of the unique ways for human beings to express their feelings.It becomes one of the important topics in pragmatic study how the human system operates.This article introduces four maxims of Gricean cooperative principle and attempts to explore how humor in Friends,an American situation comedy is caused by violation of the principle and how to interpret humor in context.It will help us to understand English humor deeply so as to improve learners' communicative ability of language.
基金Supported by the National Natural Science Foundation of China under Grant No.11275088the Natural Science Foundation of the Liaoning Scientific Committee under Grant No.201102114Foundation of Liaoning Educational Committee under Grant No.LT2011015
文摘Considering the experimental constraints on the free parameters of the 331 model with a leptonic sector consistent of five triplets, we investigate the lepton flavor violation(LFV) tau decays τ→μM with M = P and V,where P and V denote a pseudoscalar meson(π, η or η′) and a vector meson(ρ0, ω or φ), respectively. We find that the contributions of the 331 model to the LFV decays τ→μM mainly come from the new neutral gauge boson Z′. The 331 model considered in this paper can not make the values of the branching ratio Br(τ→μM) approach the corresponding experimental upper limits.
基金The project supported by National Natural Science Foundation of China
文摘The top-charm associated production with the effects from both B- and L-violating interactions in TeVscale photon-proton collisions is investigated in the framework of Rp minimal supersymmetric standard model. Withinthe bounds on the relevant R-parity violating couplings, the total cross section will reach the order of 10 fb in some partsof the parameter space.
文摘The top-charm associated production with the effects from both B- and L-violating interactions in TeV scale photon-proton collisions is investigated in the framework of minimal supersymmetric standard model. Within the bounds on the relevant R-parity violating couplings, the total cross section will reach the order of 10 fb in some parts of the parameter space.
文摘Study of neutrino properties is nowadays one of the most active domains of research in physics. On the one hand, fundamental properties of the neutrinos like their absolute mass, their character (are they Dirac or Majorana particles?) and the number of neutrino flavors, are still unknown. On the other hand, the knowledge of these properties are of great importance since the neutrinos are very abundant in nature and play a key role in nuclear and particle physics, astrophysics and cosmology. In addition, the results of the neutrino oscillation experiments have convincingly showed that neutrinos have mass and mix, in contradiction to the initial assumptions of the Standard Model. In this context there is an increased interest in the study of the Lepton Number Violating (LNV) processes, since they are capable to decide on the above mentioned neutrino properties. Since recently, the neutrinoless double beta (0nββ) decay was considered the only process able to distinguish between Dirac or Majorana neutrinos and to give a hint on the absolute mass of the electron neutrino. At present, the increased luminosity of the LHC experiments at CERN makes it feasable the search for LNV processes at LHC as well. Besides the neutrino character, these studies can also shed light on the existence of other types of neutrinos (the sterile neutrinos), than the three known ones. In this paper, I make a brief review on our present knowledge about the neutrino properties and on the way they can be probed by LNV processes at low- and high-energies. Particularly, I refer to the 0nββ decay process and to the first attempts of searching of LNV processes in hadron collider experiments, particularly in LHC experiments at CERN-Geneva.
文摘By applying the rules for the sum of quark oscillation probabilities for the original CKM matrix and for Wolfenstein’s parameterization, equations were derived in which the CP violating phase for quarks appears as an unknown quantity. Quark oscillations occur in spaces that are on the femtometer scale and they are unmeasurable from the point of view of experiments. However, the consequence of those oscillations is the CP violating phase for quarks, which is measured through unitary triangles in Wolfenstein’s parameterization. Through the mathematical model presented in this paper, the equation in Wolfenstein’s parameterization was derived, the root of which is consistent with measurements in today’s quark physics.
文摘Humor is a kind of literature that can be found everywhere in our daily life. It is also a kind of language art that can be created by various reasons. This essay will analyze humor from a knowledge of pragmatics—cooperative principle (CP) and show how the humorous effect achieved ascribed to the breaking the four maxims of the cooperative principle. It also provides a lot of examples to show how to achieve humorous effect by applying Grice’s cooperative principle. The creation of humor and violation of CP have close relationship. Violating CP in the surface may create humor. A better understanding about humor will be achieved under an analysis of CP. As a linguistic phenomenon, humor has its own charm. It’s good medicine,that can improve interpersonal relationships and make others feel comfortable.
基金The work of John Ellis was supported in part by the United Kingdom STFC(Grant No.ST/T000759/1)The work of Hong-Jian He and Rui-Qing Xiao were supported in part by the National Natural Science Foundation of China(Grant Nos.12175136,and 12435005)+4 种基金the Shenzhen Science and Technology Program(Grant No.JCYJ20240813150911015)the State Key Laboratory of Dark Matter Physics,the Key Laboratory for Particle Astrophysics and Cosmology(MOE)the Shanghai Key Laboratory for Particle Physics and Cosmology.Rui-Qing Xiao is also supported in part by the National Science Foundation of China(Grant Nos.12175006,12188102,and 12061141002)the Ministry of Science and Technology of China(Grant No.2023YFA1605800)the State Key Laboratory of Nuclear Physics and Technology.
文摘We study the CP-violating(CPV)neutral triple gauge couplings(nTGCs)that can be realized via dimension-8 operators in the Standard Model Effective Field Theory(SMEFT).We present a new formulation of the CPV nTGC form factors that is compat-ible with the spontaneous breaking of the electroweak gauge symmetry,and show how these CPV form factors can be matched consistently with the corresponding dimension-8 CPV nTGC operators in the broken phase.We then study probes of the CPV nTGCs at future high-energy e^(+)e^(−)colliders with centre-of-mass energies√s=0.25,0.5,1,3,5 TeV,respectively,demonstrating that the e■beam polarizations can help to improve the sensitivities of probes of the nTGCs.We estimate that the sensitivity reaches for probing the new physics scales of nTGCs can range from O(TeV)at a 250 GeV e^(+)e^(−)collider to O(10 TeV)at an e^(+)e^(−)collider of energy 3-5 TeV,and that the sensitivities to the nTGC form factors vary from O(10^(−4))to O(10^(−6)-10^(−8))for the e^(+)e^(−)collision energy from 250 GeV to 3-5 TeV.
文摘The article[1]discusses systematically the measurement of neutral triple gauge boson couplings(nTGCs)[2-11](that violate CP symmetry)at high-energy colliders,especially at the electron-positron Higgs factories.Since direct couplings of triple neutral gauge bosons do not exist both in the dimension-4 Lagrangian of the standard model(SM)and at the dimension-6 level of the SM effective field theory(SMEFT),measuring the nTGCs can provide an effective window for searching new physics beyond the SM.Furthermore,the nTGCs can provide possible new source of CP violations beyond the Kobayashi-Maskawa(KM)mechanism[12]of the SM.Hence,measuring the CPV nTGCs is important for a better understanding of the CP violations and possibly the origin of the matter in the Universe.
文摘The hitherto unconstrained lepton flavor mixings,induced by the new gauge boson Z ,which are the prediction of many new physics models,such as topcolor-assisted technicolor (TC2) models and flavor-universal TC2 models,may lead to the lepton flavor violating productions of τμˉ,τeˉ and μeˉ in photon-photon collision at the proposed International Linear Collider (ILC).Through a comparative analysis of these processes,we find that the better channel to probe the new physics models is the production of τμˉ or τeˉ which occurs at a much higher rate than μeˉ production due to the large mixing angle and the large flavor changing coupling,and may reach the detectable level of the ILC for a large part of the parameter space.Since the rates predicted by the Standard Model are far below the detectable level,these processes may serve as a sensitive probe for such new physics models.
基金the Higher Education Commission of Pakistan for awarding the funds under Grant 20-577
文摘We present the comaprative study of semileptonic and leptonic decays of Ds, D±and D0meson（D →M l＋-αl-β, D → l＋αlβ, D → l＋αvα;α,β=e,μ） within the framework of R-parity violating the（ Rp） Minimal Supersymmetric Standard Model（MSSM）. The comparison shows that combination and product couplings,（λβiα λ＊ ij qor λβqkλ＊αj k）contribution to the branching fractions of the said processes（under consideration） is consistent with or comparable to the experimental measurements in most of the cases. However, some cases exist where these contributions are highly suppressed. We identify such cases in our analysis and single out the important ones suitable for exploring in the future and current experiments.
文摘We search for a possible relationship between weak gravity conjecture(WGC)and conformal field theory(CFT)in hyperscaling violating and Kerr-Newman-AdS black holes.We deal with the critical points of the black hole systems using the correlation function introduced in CFT and discuss WGC conditions using the imaginary part of the energy obtained from the critical points and their poles.Under the assumptions z=1,d=1,andθ→0-,we link WGC to hyperscaling violating black holes owing to the existence of rHvalues larger and smaller than one.For the second black hole system,we study the conditions of WGC for Kerr-Newman-AdS black holes using rotation and radius parameters.Then,we show that the conditions of WGC are satisfied when the charged particle near the hyperscaling violating and Kerr-Newman black holes is 1/a with a ratio a/l《1.
基金Supported by the Natural Science Foundation of Hebei Province(A2022104001,A2022201017)the Shanxi Scholarship Council of China(2021-31)+1 种基金the youth top-notch talent support program of the Hebei Provincethe Foundation of Baoding University(2018Z01)
文摘In this study,we analyze the rare decays of the neutral vector mesons J/ψ and Υ(nS)in the scenario of the minimal R-symmetric supersymmetric standard model using the effective Lagrangian method.The predicted branching ratios are dominated by the mass insertion parameters δ^(ij),i.e.,the off-diagonal inputs,and the contributions of different parts are comparable.Taking into account the experimental constraints on the mass insertion parameters,the predicted branching ratios for the most promising processes Υ(nS)→lτ are ten orders of magnitude smaller than the present experimental bounds.
基金Supported by the National Natural Science Foundation of China(11405102,11847168)the Fundamental Research Funds for the Central Universities of China(GK201603027,GK201803019,1301030621)the Natural Science Foundation of Shannxi Province,China(2019JM-431)
文摘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.
基金supported in part by the MIUR research grant “Theoretical Astroparticle Physics” PRIN 2012CPPYP7partly supported by the DFG and the NSFC through funds provided to the Sino-German CRC 110 “Symmetries and the Emergence of Structure in QCD”+2 种基金MOST,Taiwan,(104-2112-M-001-022)from April 2017Supported by MEPhI Academic Excellence Project(contract 02.03.21.0005,27.08.2013)supported by the Ministry of Education and Science of Russian Federation,project 3.472.2014/K and grant RFBR 14-22-03048
文摘We discuss possible implications of exotic stringy instantons for baryon-violating signatures in future colliders. In particular, we discuss high-energy quark collisions and A- transitions. In principle, the A-A process can be probed by high-luminosity electron-positron colliders. However, we find that an extremely high luminosity is needed in order to provide a （somewhat） stringent bound compared to the current data on NN→ππ,KK. On the other hand, （exotic） instanton-induced six-quark interactions can be tested in near future high-energy colliders beyond LHC, at energies around 20-100 TeV. The Super proton-proton Collider （SppC） would be capable of such measurement given the proposed energy level of 50-90 TeV. Comparison with other channels is made. In particular, we show the compatibility of our model with neutron-antineutron and NN→ππ, KK bounds.
基金Supported by National Nature Science Foundation of China
文摘In the supersymmetric left-right model, the light neutrino masses are given by the Type-seesaw mechanism. A duality property of this mechanism indicates that there exist eight possible Higgs triplet Yukawa couplings which result in the same neutrino mass matrix. In this paper, we work out the one-loop renormalization group equations for the effective neutrino mass matrix in the supersymmetric left-right model. The stability of the Typeseesaw scenario is briefly discussed. We also study the lepton-flavor-violating processes （τ → μγ and τ → eγ） by using the reconstructed Higgs triplet Yukawa couplings.
