In the low energy realization of the quirk assisted Standard Model,the couplings between the exotic particles"quirks"and gauge bosons may contribute to the W mass and muon g−2 anomaly reported by FermiLab.We...In the low energy realization of the quirk assisted Standard Model,the couplings between the exotic particles"quirks"and gauge bosons may contribute to the W mass and muon g−2 anomaly reported by FermiLab.We calculate the contributions from supersymmetric quirk particles as an example.By imposing the theoretical constraints,we determined that the CDF II W-boson mass increment strictly constrains the mixing and coupling parameters and the quirk mass mF,while the muon g−2 anomaly cannot be solely attributed to the involvement of exotic particles,considering their significantly large masses.展开更多
Leptoquark(LQ)models are well motivated solutions to the(g-2)_(μ)anomaly.In the minimal LQ models,only specific representations can lead to chiral enhancements.For the scalar LQs,R_(2)and S_(1)can lead to the top qua...Leptoquark(LQ)models are well motivated solutions to the(g-2)_(μ)anomaly.In the minimal LQ models,only specific representations can lead to chiral enhancements.For the scalar LQs,R_(2)and S_(1)can lead to the top quark chiral enhancement.For the vector LQs,V_(2)and U_(1)can lead to the bottom quark chiral enhancement.When we consider the LQ and vector-like quark(VLQ)simultaneously,there can be more scenarios.In our previous study,we considered the scalar LQ and VLQ extended models with up-type quark chiral enhancement.Here,we study the scalar LQ and VLQ extended models with down-type quark chiral enhancement.We find two new models with B quark chiral enhancements,which originate from the bottom and bottom partner mixing.Then,we propose new LQ and VLQ search channels under the constraints of(g-2)_(μ).展开更多
The CDF collaboration recently announced a new measurement result for the W boson mass,and it is in tension with the standard model prediction.In this paper,we explain this anomaly in the vector-like quark(VLQ)(X,T,B)...The CDF collaboration recently announced a new measurement result for the W boson mass,and it is in tension with the standard model prediction.In this paper,we explain this anomaly in the vector-like quark(VLQ)(X,T,B)_(L,R)and leptoquark(LQ)S_(3)extended model.In this model,both the VLQ and LQ have positive corrections to the W boson mass.Moreover,it may be a solution to the(g-2)_(μ)anomaly because of the chiral enhancements from top,T,and B quarks.展开更多
Motivated by recent supersymmetry(SUSY)search results,which prefer most SUSY particles to be heavy,and the muon g–2 anomaly,which prefers colorless SUSY particles to be light,we explore the status of a light smuon(th...Motivated by recent supersymmetry(SUSY)search results,which prefer most SUSY particles to be heavy,and the muon g–2 anomaly,which prefers colorless SUSY particles to be light,we explore the status of a light smuon(the SUSY partner of a left-handed muon lepton)in the next-to-minimal supersymmetric standard model(NMSSM).Assuming colored SUSY particles to be heavy,and considering numerous experimental constraints,including muon g-2,SUSY searches,and dark matter,we scan the parameter space in the NMSSM with Z3-symmetry and check the status of colorless SUSY particles and their possible mass order,paying special attention to the smuon.After calculations and discussions,we find that the surviving samples can be divided into several scenarios,where the mass region and decay information of the smuon are given.Overall,the smuon mass can be approximately 0.1~1.8 TeV.These results may be useful for smuon searches at the LHC and future colliders.展开更多
Two experiments from the Fermilab, E989 and CDF II, have reported two anomalies for muon g-2 and W-boson mass that may indicate the new physics at the low energy scale. Here we examine the possibility of a common orig...Two experiments from the Fermilab, E989 and CDF II, have reported two anomalies for muon g-2 and W-boson mass that may indicate the new physics at the low energy scale. Here we examine the possibility of a common origin of these two anomalies in the Next-to-Minimal Supersymmetric Standard Model. Considering various experimental and astrophysical constraints such as the Higgs mass, collider data, flavor physics, dark matter relic density, and direct detection experiments, we find that lighter electroweakinos and sleptons can generate sufficient contributions to muon g-2 and mW. Moreover, the corresponding bino-like neutralino dark matter mass is in the ~ 180-280 Ge V range. Interestingly, the favored dark matter(DM) mass region can soon be entirely probed by ongoing direct detection experiments like Panda X-4T, XENONn T, LUX-ZEPLIN, and DARWIN.展开更多
The inclusion of theρ−ωmixing effect is essential for a precise description of the pion electromagnetic form factor in the e+e−→π+π−process,which quantifies the two-pion contribution to the anomalous magnetic mom...The inclusion of theρ−ωmixing effect is essential for a precise description of the pion electromagnetic form factor in the e+e−→π+π−process,which quantifies the two-pion contribution to the anomalous magnetic moment of muon aμ.In this study,we analyze the momentum dependence ofρ−ωmixing by considering loop contributions at the next-to-leading order in 1/NC expansion within the framework of resonance chiral theory.We revisit a previous study[Y.H.Chen,D.L.Yao,and H.Q.Zheng,Commun.Theor.Phys.69,1(2018)]and consider the contribution arising from the kaon mass splitting in the kaon loops and latest experimental data.We perform two types of fits(with momentum-independent or momentum-dependentρ−ωmixing amplitude)to describe e+e−→π+π−andτ→ντ2πdata within the energy region of 600−900 MeV and decay width ofω→π+π−.Furthermore,we compare their results.Our findings indicate that the momentum-independent and momentum-dependentρ−ωmixing schemes provide appropriate descriptions of the data.However,the momentum-dependent scheme exhibits greater self-consistency,considering the reasonable imaginary part of the mixing matrix elementΠρωobtained.Regarding the contribution to the anomalous magnetic moment of the muon,aππμ|[0.6,0.9]GeV,the results obtained from the fits considering the momentum-dependentρ−ωmixing amplitude are in good agreement with those obtained without incorporating the momentum dependence ofρ−ωmixing,within the margin of errors.Furthermore,based on the fitted values of the relevant parameters,we observe that the decay width ofω→π+π−is predominantly influenced by theρ−ωmixing effect.展开更多
The new CDF II measurement of W-boson mass shows a 7σdeviation from the standard model(SM)prediction,while the recent FNAL measurement of the muon g-2 shows a 4.2σdeviation(combined with the BNL result)from the SM.B...The new CDF II measurement of W-boson mass shows a 7σdeviation from the standard model(SM)prediction,while the recent FNAL measurement of the muon g-2 shows a 4.2σdeviation(combined with the BNL result)from the SM.Both of them strongly indicate new physics beyond the SM.In this work,we study the implication of both measurements on low energy supersymmetry.With an extensive exploration of the parameter space of the minimal supersymmetric standard model(MSSM),we find that in the parameter space allowed by current experimental constraints from colliders and dark matter detections,the MSSM can simultaneously explain both measurements on the edge of 2σlevel,taking theoretical uncertainties into consideration.The favored parameter space,characterized by a compressed spectrum between bino,wino and stau,with the stop being around 1 TeV,may be covered in the near future LHC searches.展开更多
The supersymmetric model is one of the most attractive extensions of the Standard Model of particle physics.In light of the most recently reported anomaly of the muon g-2 measurement by the FermiLab E989 experiment,an...The supersymmetric model is one of the most attractive extensions of the Standard Model of particle physics.In light of the most recently reported anomaly of the muon g-2 measurement by the FermiLab E989 experiment,and the excesses of gamma rays at the Galactic center observed by Fermi-LAT space telescope,as well as the antiproton excess observed by the Alpha Magnetic Spectrometer,we propose to account for all these anomalies or excesses in the Next-to-Minimal Supersymmetric Standard Model(NMSSM).Considering various experimental constraints including the Higgs mass,B-physics,collider data,dark matter relic density and direct detections,we find that a~60 GeV bino-like neutralino is able to successfully explain all these observations.Our scenario can be sensitively probed by future direct detection experiments.展开更多
Using BrUTP incorporation and statistical analysis, the authors investigated RNA transcription in the interphase nuclei in Physarum polycephalum Schw. The rRNA synthesis in the nucleolus continued actively throughout ...Using BrUTP incorporation and statistical analysis, the authors investigated RNA transcription in the interphase nuclei in Physarum polycephalum Schw. The rRNA synthesis in the nucleolus continued actively throughout the interphase, while in nucleoplasm hnRNA was transcribed at law levels in S phase and actively in G(2) phase. The rate of nucleoplasm RNA transcription was doubled between early S phase and late S phase, and a 5-6 folds increase was detected between the early S phase and G(2) phase.展开更多
Let G be a graph, and g and f be integer valued functions defined on V(G) which satisfy g(x)≤f(x) and g(x)≡f(x)(mod 2) for all x∈V(G). Then a spanning subgraph F of G is called a {g,g+2,…,f} -factor if deg_F(x)∈{...Let G be a graph, and g and f be integer valued functions defined on V(G) which satisfy g(x)≤f(x) and g(x)≡f(x)(mod 2) for all x∈V(G). Then a spanning subgraph F of G is called a {g,g+2,…,f} -factor if deg_F(x)∈{g(x),g(x)+2,…,f(x)} for all x∈V(G), when g(x)=1 for all x∈V(G), such a factor is called (1,f) -odd-factor. We give necessary and sufficient conditions for a graph G to have a {g,g+2,…,f} -factor and a (1,f) -odd-factor which contains an arbitrarily given edge of G, from that we derive some interesting results.展开更多
Flavor-specific scalar bosons exist in various Standard Model extensions and couple to a single generation of fermions via a global flavor symmetry breaking mechanism. Given this strategy, we propose a Me V flavor-spe...Flavor-specific scalar bosons exist in various Standard Model extensions and couple to a single generation of fermions via a global flavor symmetry breaking mechanism. Given this strategy, we propose a Me V flavor-specific scalar model in dimension-5 operator series, which explains the muon g-2 anomaly and proton radius puzzle by coupling with the muon and down-quark at the same time. The framework is consistent with the null result of high-intensity searches. Specifically, the supernova constraints for muon couplings become weakened by including the contribution of down-quark interaction. The parameter space for explaining muon g-2 discrepancy is available when 10% energy deposition is required in the energy explosion process in the supernova,but this is ruled out by the 1% energy deposition requirement. We also investigate the searches for mediator and dark matter and the resulting constraints on viable parameter space such as nuclear physics constraints, direct detection for light boosted dark matter, and possible CMB constraints. When compared with conventional dark matter production, light dark matter production has two additional modifications: bound state formation and early kinetic equilibrium decoupling. We are now looking into the implications of these effects on the relic density of light dark matter.展开更多
Motivated by the simple toroidal compactification of extra-dimensional SUSY theories, we investigate a partial N =2 supersymmetric（SUSY） extension of the standard model which has an N =2 SUSY sector and an N =1 SUSY...Motivated by the simple toroidal compactification of extra-dimensional SUSY theories, we investigate a partial N =2 supersymmetric（SUSY） extension of the standard model which has an N =2 SUSY sector and an N =1 SUSY sector. We point out that below the scale of the partial breaking of N = 2 to N = 1, the ratio of Yukawa to gauge couplings embedded in the original N =2 gauge interaction in the N =2 sector becomes greater due to a fixed point. Since at the partial breaking scale the sfermion masses in the N = 2 sector are suppressed due to the N = 2 non-renormalization theorem, the anomaly mediation effect becomes important. If dominant, the anomaly-induced masses for the sfermions in the N = 2 sector are almost UV-insensitive due to the fixed point. Interestingly, these masses are always positive, i.e. there is no tachyonic slepton problem. From an example model, we show interesting phenomena differing from ordinary MSSM. In particular, the dark matter particle can be a sbino, i.e. the scalar component of the N = 2 vector multiplet of U（1）_Y. To obtain the correct dark matter abundance, the mass of the sbino, as well as the MSSM sparticles in the N =2 sector which have a typical mass pattern of anomaly mediation, is required to be small. Therefore, this scenario can be tested and confirmed in the LHC and may be further confirmed by the measurement of the N = 2 Yukawa couplings in future colliders. This model can explain dark matter, the muon g-2 anomaly, and gauge coupling unification, and relaxes some ordinary problems within the MSSM. It is also compatible with thermal leptogenesis.展开更多
In a few months the KLOE-2 detector is expected to start data taking at the upgraded DAФNE φ-factory of INFN Laboratori Nazionali di Frascati. It aims to collect 25 fb^-1 at the φ（1020） peak, and about 5 fb^-1 in...In a few months the KLOE-2 detector is expected to start data taking at the upgraded DAФNE φ-factory of INFN Laboratori Nazionali di Frascati. It aims to collect 25 fb^-1 at the φ（1020） peak, and about 5 fb^-1 in the energy region between 1 and 2.5 GeV. We review the status and physics program of the project.展开更多
Results on the lowest-order hadronic vacuum polarization contribution to the muon magnetic anomaly are presented. They are based on the latest published experimental data used as input to the dispersion integral. Thus...Results on the lowest-order hadronic vacuum polarization contribution to the muon magnetic anomaly are presented. They are based on the latest published experimental data used as input to the dispersion integral. Thus recent results on τ→υτππ^0 decays from Belle and on e^＋e^- annihilation to π^＋π^- from BABAR and KLOE are included. The new data, together with improved isospin-breaking corrections for τ decays, result into a much better consistency among the different results. A discrepancy between the Standard Model prediction and the direct g- 2 measurement is found at the level of 3σ.展开更多
基金Supported by the National Natural Science Foundation of China (12075213)。
文摘In the low energy realization of the quirk assisted Standard Model,the couplings between the exotic particles"quirks"and gauge bosons may contribute to the W mass and muon g−2 anomaly reported by FermiLab.We calculate the contributions from supersymmetric quirk particles as an example.By imposing the theoretical constraints,we determined that the CDF II W-boson mass increment strictly constrains the mixing and coupling parameters and the quirk mass mF,while the muon g−2 anomaly cannot be solely attributed to the involvement of exotic particles,considering their significantly large masses.
基金Supported by an appointment to the Young Scientist Training Program at the APCTP through the Science and Technology Promotion Fund and Lottery Fund of the Korean Governmentsupported by the Korean Local Governments-Gyeongsangbuk-do Province and Pohang City
文摘Leptoquark(LQ)models are well motivated solutions to the(g-2)_(μ)anomaly.In the minimal LQ models,only specific representations can lead to chiral enhancements.For the scalar LQs,R_(2)and S_(1)can lead to the top quark chiral enhancement.For the vector LQs,V_(2)and U_(1)can lead to the bottom quark chiral enhancement.When we consider the LQ and vector-like quark(VLQ)simultaneously,there can be more scenarios.In our previous study,we considered the scalar LQ and VLQ extended models with up-type quark chiral enhancement.Here,we study the scalar LQ and VLQ extended models with down-type quark chiral enhancement.We find two new models with B quark chiral enhancements,which originate from the bottom and bottom partner mixing.Then,we propose new LQ and VLQ search channels under the constraints of(g-2)_(μ).
基金Supported by an appointment to the Young Scientist Training Program at the APCTP through the Science and Technology Promotion FundLottery Fund of the Korean Governmentsupported by the Korean Local Governments-Gyeongsangbuk-do Province and Pohang City。
文摘The CDF collaboration recently announced a new measurement result for the W boson mass,and it is in tension with the standard model prediction.In this paper,we explain this anomaly in the vector-like quark(VLQ)(X,T,B)_(L,R)and leptoquark(LQ)S_(3)extended model.In this model,both the VLQ and LQ have positive corrections to the W boson mass.Moreover,it may be a solution to the(g-2)_(μ)anomaly because of the chiral enhancements from top,T,and B quarks.
基金Supported by the National Natural Science Foundation of China(NNSFC,11605123)。
文摘Motivated by recent supersymmetry(SUSY)search results,which prefer most SUSY particles to be heavy,and the muon g–2 anomaly,which prefers colorless SUSY particles to be light,we explore the status of a light smuon(the SUSY partner of a left-handed muon lepton)in the next-to-minimal supersymmetric standard model(NMSSM).Assuming colored SUSY particles to be heavy,and considering numerous experimental constraints,including muon g-2,SUSY searches,and dark matter,we scan the parameter space in the NMSSM with Z3-symmetry and check the status of colorless SUSY particles and their possible mass order,paying special attention to the smuon.After calculations and discussions,we find that the surviving samples can be divided into several scenarios,where the mass region and decay information of the smuon are given.Overall,the smuon mass can be approximately 0.1~1.8 TeV.These results may be useful for smuon searches at the LHC and future colliders.
基金supported by the National Natural Science Foundation of China(Grant Nos.11921003,and U1738210)China Postdoctoral Science Foundation(Grant No.2020M681757)Key Research Program of the Chinese Academy of Sciences(Grant No.XDPB15)。
文摘Two experiments from the Fermilab, E989 and CDF II, have reported two anomalies for muon g-2 and W-boson mass that may indicate the new physics at the low energy scale. Here we examine the possibility of a common origin of these two anomalies in the Next-to-Minimal Supersymmetric Standard Model. Considering various experimental and astrophysical constraints such as the Higgs mass, collider data, flavor physics, dark matter relic density, and direct detection experiments, we find that lighter electroweakinos and sleptons can generate sufficient contributions to muon g-2 and mW. Moreover, the corresponding bino-like neutralino dark matter mass is in the ~ 180-280 Ge V range. Interestingly, the favored dark matter(DM) mass region can soon be entirely probed by ongoing direct detection experiments like Panda X-4T, XENONn T, LUX-ZEPLIN, and DARWIN.
基金the Fundamental Research Funds for the Central Universities(FRF-BR-19-001A)the National Natural Science Foundation of China(11975028,11974043)。
文摘The inclusion of theρ−ωmixing effect is essential for a precise description of the pion electromagnetic form factor in the e+e−→π+π−process,which quantifies the two-pion contribution to the anomalous magnetic moment of muon aμ.In this study,we analyze the momentum dependence ofρ−ωmixing by considering loop contributions at the next-to-leading order in 1/NC expansion within the framework of resonance chiral theory.We revisit a previous study[Y.H.Chen,D.L.Yao,and H.Q.Zheng,Commun.Theor.Phys.69,1(2018)]and consider the contribution arising from the kaon mass splitting in the kaon loops and latest experimental data.We perform two types of fits(with momentum-independent or momentum-dependentρ−ωmixing amplitude)to describe e+e−→π+π−andτ→ντ2πdata within the energy region of 600−900 MeV and decay width ofω→π+π−.Furthermore,we compare their results.Our findings indicate that the momentum-independent and momentum-dependentρ−ωmixing schemes provide appropriate descriptions of the data.However,the momentum-dependent scheme exhibits greater self-consistency,considering the reasonable imaginary part of the mixing matrix elementΠρωobtained.Regarding the contribution to the anomalous magnetic moment of the muon,aππμ|[0.6,0.9]GeV,the results obtained from the fits considering the momentum-dependentρ−ωmixing amplitude are in good agreement with those obtained without incorporating the momentum dependence ofρ−ωmixing,within the margin of errors.Furthermore,based on the fitted values of the relevant parameters,we observe that the decay width ofω→π+π−is predominantly influenced by theρ−ωmixing effect.
基金supported by the National Natural Science Foundation of China(11821505,12075300,and 12105248)the Key Research Project of Henan Education Department for Colleges and Universities(21A140025)+4 种基金Peng-Huan-Wu Theoretical Physics Innovation Center(12047503)the CAS Center for Excellence in Particle Physics(CCEPP)the CAS Key Research Program of Frontier Scienceshe Key R&D Program of Ministry of Science and Technology of the People’s Republic of China(2017YFA0402204)the Key Research Program of the Chinese Academy of Sciences(XDPB15)。
文摘The new CDF II measurement of W-boson mass shows a 7σdeviation from the standard model(SM)prediction,while the recent FNAL measurement of the muon g-2 shows a 4.2σdeviation(combined with the BNL result)from the SM.Both of them strongly indicate new physics beyond the SM.In this work,we study the implication of both measurements on low energy supersymmetry.With an extensive exploration of the parameter space of the minimal supersymmetric standard model(MSSM),we find that in the parameter space allowed by current experimental constraints from colliders and dark matter detections,the MSSM can simultaneously explain both measurements on the edge of 2σlevel,taking theoretical uncertainties into consideration.The favored parameter space,characterized by a compressed spectrum between bino,wino and stau,with the stop being around 1 TeV,may be covered in the near future LHC searches.
基金the National Natural Science Foundation of China(U1738210,12047560,and 11773075)China Post-doctoral Science Foundation(2020M681757)。
文摘The supersymmetric model is one of the most attractive extensions of the Standard Model of particle physics.In light of the most recently reported anomaly of the muon g-2 measurement by the FermiLab E989 experiment,and the excesses of gamma rays at the Galactic center observed by Fermi-LAT space telescope,as well as the antiproton excess observed by the Alpha Magnetic Spectrometer,we propose to account for all these anomalies or excesses in the Next-to-Minimal Supersymmetric Standard Model(NMSSM).Considering various experimental constraints including the Higgs mass,B-physics,collider data,dark matter relic density and direct detections,we find that a~60 GeV bino-like neutralino is able to successfully explain all these observations.Our scenario can be sensitively probed by future direct detection experiments.
文摘Using BrUTP incorporation and statistical analysis, the authors investigated RNA transcription in the interphase nuclei in Physarum polycephalum Schw. The rRNA synthesis in the nucleolus continued actively throughout the interphase, while in nucleoplasm hnRNA was transcribed at law levels in S phase and actively in G(2) phase. The rate of nucleoplasm RNA transcription was doubled between early S phase and late S phase, and a 5-6 folds increase was detected between the early S phase and G(2) phase.
文摘Let G be a graph, and g and f be integer valued functions defined on V(G) which satisfy g(x)≤f(x) and g(x)≡f(x)(mod 2) for all x∈V(G). Then a spanning subgraph F of G is called a {g,g+2,…,f} -factor if deg_F(x)∈{g(x),g(x)+2,…,f(x)} for all x∈V(G), when g(x)=1 for all x∈V(G), such a factor is called (1,f) -odd-factor. We give necessary and sufficient conditions for a graph G to have a {g,g+2,…,f} -factor and a (1,f) -odd-factor which contains an arbitrarily given edge of G, from that we derive some interesting results.
基金supported by the National Natural Science Foundation of China(Grant No.11805161)the Natural Science Foundation of Shandong Province(Grant No.ZR2018QA007)+4 种基金the Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Education,Science and Technology(Grant No.NRF-2019R1A2C2003738)the Korea Research Fellowship Program through the NRF funded by the Ministry of Science and ICT(Grant No.2019H1D3A1A01070937)Xuewen Liu was supported by the National Natural Science Foundation of China(Grant Nos.11947034,and 12005180)the Natural Science Foundation of Shandong Province(Grant No.ZR2020QA083)supported by the Project of Shandong Province Higher Educational Science and Technology Program(Grant No.2019KJJ007)。
文摘Flavor-specific scalar bosons exist in various Standard Model extensions and couple to a single generation of fermions via a global flavor symmetry breaking mechanism. Given this strategy, we propose a Me V flavor-specific scalar model in dimension-5 operator series, which explains the muon g-2 anomaly and proton radius puzzle by coupling with the muon and down-quark at the same time. The framework is consistent with the null result of high-intensity searches. Specifically, the supernova constraints for muon couplings become weakened by including the contribution of down-quark interaction. The parameter space for explaining muon g-2 discrepancy is available when 10% energy deposition is required in the energy explosion process in the supernova,but this is ruled out by the 1% energy deposition requirement. We also investigate the searches for mediator and dark matter and the resulting constraints on viable parameter space such as nuclear physics constraints, direct detection for light boosted dark matter, and possible CMB constraints. When compared with conventional dark matter production, light dark matter production has two additional modifications: bound state formation and early kinetic equilibrium decoupling. We are now looking into the implications of these effects on the relic density of light dark matter.
文摘Motivated by the simple toroidal compactification of extra-dimensional SUSY theories, we investigate a partial N =2 supersymmetric（SUSY） extension of the standard model which has an N =2 SUSY sector and an N =1 SUSY sector. We point out that below the scale of the partial breaking of N = 2 to N = 1, the ratio of Yukawa to gauge couplings embedded in the original N =2 gauge interaction in the N =2 sector becomes greater due to a fixed point. Since at the partial breaking scale the sfermion masses in the N = 2 sector are suppressed due to the N = 2 non-renormalization theorem, the anomaly mediation effect becomes important. If dominant, the anomaly-induced masses for the sfermions in the N = 2 sector are almost UV-insensitive due to the fixed point. Interestingly, these masses are always positive, i.e. there is no tachyonic slepton problem. From an example model, we show interesting phenomena differing from ordinary MSSM. In particular, the dark matter particle can be a sbino, i.e. the scalar component of the N = 2 vector multiplet of U（1）_Y. To obtain the correct dark matter abundance, the mass of the sbino, as well as the MSSM sparticles in the N =2 sector which have a typical mass pattern of anomaly mediation, is required to be small. Therefore, this scenario can be tested and confirmed in the LHC and may be further confirmed by the measurement of the N = 2 Yukawa couplings in future colliders. This model can explain dark matter, the muon g-2 anomaly, and gauge coupling unification, and relaxes some ordinary problems within the MSSM. It is also compatible with thermal leptogenesis.
文摘In a few months the KLOE-2 detector is expected to start data taking at the upgraded DAФNE φ-factory of INFN Laboratori Nazionali di Frascati. It aims to collect 25 fb^-1 at the φ（1020） peak, and about 5 fb^-1 in the energy region between 1 and 2.5 GeV. We review the status and physics program of the project.
文摘Results on the lowest-order hadronic vacuum polarization contribution to the muon magnetic anomaly are presented. They are based on the latest published experimental data used as input to the dispersion integral. Thus recent results on τ→υτππ^0 decays from Belle and on e^＋e^- annihilation to π^＋π^- from BABAR and KLOE are included. The new data, together with improved isospin-breaking corrections for τ decays, result into a much better consistency among the different results. A discrepancy between the Standard Model prediction and the direct g- 2 measurement is found at the level of 3σ.
