The Experts below are selected from a list of 16353 Experts worldwide ranked by ideXlab platform
Luca Silvestrini - One of the best experts on this subject based on the ideXlab platform.
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universal unitarity triangle and physics beyond the standard model
Physics Letters B, 2001Co-Authors: Andrzej J Buras, Paolo Gambino, Martin Gorbahn, Sebastian Jager, Luca SilvestriniAbstract:We make the simple observation that there exists a universal unitarity triangle for all models, like the SM, the Two Higgs Doublet Models I and II and the MSSM with minimal flavour violation, that do not have any new operators beyond those present in the SM and in which all flavour changing transitions are governed by the CKM matrix with no new phases beyond the CKM phase. This universal triangle can be determined in the near future from the ratio (DeltaM)(d)/(DeltaM)(s) and sin 2 beta measured first through the CP asymmetry in B-d(0) --> psi K-S and later in K --> pi nu )over bar> decays. Also suitable ratios of the branching ratios for B --> X(d,s)nu )over bar> and B-d,B-s --> mu (+)mu (-) and the angle gamma measured by means of CP asymmetries in B decays can be used for this determination. Comparison of this universal triangle with the nonuniversal triangles extracted in each model using epsilon, (DeltaM)(d) and various branching ratios for rare decays will allow to find out in a Transparent Manner which of these models, if any, is singled out by experiment. A virtue of the universal triangle is that it allows to separate the determination of the CKM parameters from the determination of new parameters present in the extensions of the SM considered here.
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universal unitarity triangle and physics beyond the standard model
arXiv: High Energy Physics - Phenomenology, 2000Co-Authors: Andrzej J Buras, Paolo Gambino, Martin Gorbahn, Sebastian Jager, Luca SilvestriniAbstract:We make the simple observation that there exists a universal unitarity triangle for all models, like the SM, the Two Higgs Doublet Models I and II and the MSSM with minimal flavour violation, that do not have any new operators beyond those present in the SM and in which all flavour changing transitions are governed by the CKM matrix with no new phases beyond the CKM phase. This universal triangle can be determined in the near future from the ratio (Delta M)_d/(Delta M)_s and sin(2 beta) measured first through the CP asymmetry in B_d^0 to psi K_S and later in K to pi nu nubar decays. Also suitable ratios of the branching ratios for B to X_{d,s} nu nubar and B_{d,s} to mu^+ mu^- and the angle gamma measured by means of CP asymmetries in B decays can be used for this determination. Comparison of this universal triangle with the non-universal triangles extracted in each model using epsilon, (Delta M)_d and various branching ratios for rare decays will allow to find out in a Transparent Manner which of these models, if any, is singled out by experiment. A virtue of the universal triangle is that it allows to separate the determination of the CKM parameters from the determination of new parameters present in the extensions of the SM considered here.
Andrzej J Buras - One of the best experts on this subject based on the ideXlab platform.
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patterns of flavour violation in the presence of a fourth generation of quarks and leptons
Journal of High Energy Physics, 2010Co-Authors: Andrzej J Buras, Bjoern Duling, Thorsten Feldmann, Tillmann Heidsieck, Christoph Promberger, Stefan RecksiegelAbstract:We calculate the rates for the charged lepton flavour violating (LFV) decays l i → l j γ, τ → l π, τ → l η (′), μ − → e − e + e −, the six three-body leptonic decays τ − → l i − l j + l k − and the rate for μ − e conversion in nuclei in the Standard Model (SM3) extended by a fourth generation of quarks and leptons (SM4), assuming that neutrinos are Dirac particles. We also calculate branching ratios for K L → μe, K L → π 0 μe, B d,s → μe, B d,s → μe and B d,s → τμ. We find that the pattern of the LFV branching ratios in the SM4 differs significantly from the one encountered in the MSSM, allowing to distinguish these two models with the help of LFV processes in a Transparent Manner. Also differences with respect to the Littlest Higgs model with T-parity are found. Most importantly the branching ratios for l i → l j γ, τ → l π, τ → l η (′), μ − → e − e + e −, τ − → e − e + e −, τ − → μ − μ + μ −, τ − → e − μ + μ − and τ − → μ − e + e − can all still be as large as the present experimental upper bounds but not necessarily simultaneously. Also the rate for μ − e conversion in nuclei can reach the corresponding upper bound.
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charged lepton flavour violation and g 2 _mu in the littlest higgs model with t parity a clear distinction from supersymmetry
arXiv: High Energy Physics - Phenomenology, 2007Co-Authors: Monika Blanke, Andrzej J Buras, Bjoern Duling, Anton Poschenrieder, Cecilia TarantinoAbstract:We calculate the rates for the charged lepton flavour violating decays l_i -> l_j gamma, tau -> l pi, tau -> l eta, tau -> l eta', mu^- -> e^- e^+ e^-, the six three body leptonic decays tau^- -> l_i^- l_j^+ l_k^- and the rate for mu-e conversion in nuclei in the Littlest Higgs model with T-Parity (LHT). We also calculate the rates for K_{L,S} -> mu e, K_{L,S} -> pi^0 mu e and B_{d,s} -> l_i l_j. We find that the relative effects of mirror leptons in these transitions are by many orders of magnitude larger than analogous mirror quark effects in rare K and B decays analyzed recently. In particular, in order to suppress the mu -> e gamma and mu^- -> e^- e^+ e^- decay rates and the mu-e conversion rate below the experimental upper bounds, the relevant mixing matrix in the mirror lepton sector V_Hl must be rather hierarchical, unless the spectrum of mirror leptons is quasi-degenerate. We find that the pattern of the LFV branching ratios in the LHT model differs significantly from the one encountered in the MSSM, allowing in a Transparent Manner to distinguish these two models with the help of LFV processes. We also calculate (g-2)_mu and find the new contributions to a_mu below 10^{-10} and consequently negligible. We compare our results with those present in the literature.
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universal unitarity triangle and physics beyond the standard model
Physics Letters B, 2001Co-Authors: Andrzej J Buras, Paolo Gambino, Martin Gorbahn, Sebastian Jager, Luca SilvestriniAbstract:We make the simple observation that there exists a universal unitarity triangle for all models, like the SM, the Two Higgs Doublet Models I and II and the MSSM with minimal flavour violation, that do not have any new operators beyond those present in the SM and in which all flavour changing transitions are governed by the CKM matrix with no new phases beyond the CKM phase. This universal triangle can be determined in the near future from the ratio (DeltaM)(d)/(DeltaM)(s) and sin 2 beta measured first through the CP asymmetry in B-d(0) --> psi K-S and later in K --> pi nu )over bar> decays. Also suitable ratios of the branching ratios for B --> X(d,s)nu )over bar> and B-d,B-s --> mu (+)mu (-) and the angle gamma measured by means of CP asymmetries in B decays can be used for this determination. Comparison of this universal triangle with the nonuniversal triangles extracted in each model using epsilon, (DeltaM)(d) and various branching ratios for rare decays will allow to find out in a Transparent Manner which of these models, if any, is singled out by experiment. A virtue of the universal triangle is that it allows to separate the determination of the CKM parameters from the determination of new parameters present in the extensions of the SM considered here.
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universal unitarity triangle and physics beyond the standard model
arXiv: High Energy Physics - Phenomenology, 2000Co-Authors: Andrzej J Buras, Paolo Gambino, Martin Gorbahn, Sebastian Jager, Luca SilvestriniAbstract:We make the simple observation that there exists a universal unitarity triangle for all models, like the SM, the Two Higgs Doublet Models I and II and the MSSM with minimal flavour violation, that do not have any new operators beyond those present in the SM and in which all flavour changing transitions are governed by the CKM matrix with no new phases beyond the CKM phase. This universal triangle can be determined in the near future from the ratio (Delta M)_d/(Delta M)_s and sin(2 beta) measured first through the CP asymmetry in B_d^0 to psi K_S and later in K to pi nu nubar decays. Also suitable ratios of the branching ratios for B to X_{d,s} nu nubar and B_{d,s} to mu^+ mu^- and the angle gamma measured by means of CP asymmetries in B decays can be used for this determination. Comparison of this universal triangle with the non-universal triangles extracted in each model using epsilon, (Delta M)_d and various branching ratios for rare decays will allow to find out in a Transparent Manner which of these models, if any, is singled out by experiment. A virtue of the universal triangle is that it allows to separate the determination of the CKM parameters from the determination of new parameters present in the extensions of the SM considered here.
Birk Granberg - One of the best experts on this subject based on the ideXlab platform.
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sweden backcasting now strategic planning for covid 19 mitigation in a liberal democracy
Sustainability, 2020Co-Authors: Jouni Korhonen, Birk GranbergAbstract:Sweden is applying the herd-immunity as its main natural science strategy to combat the Covid-19 pandemic. This has been communicated in a Transparent Manner. Small groups of young(er) people of up to approximately 50 individuals are subject to a bigger risk of infection than others. The objective of this paper is to make a case for the argument, that alongside herd-immunity, Sweden is using the social science originated planning approach: backcasting. The government has not been Transparent on backcasting. The authors present the use of backcasting only as an argument based on available data and authors’ reasoning. A backcasting exercise for the case of the Swedish economy is constructed. This frame outlines five interdependent levels with which a national economy can apply what this paper calls a backcasting herd-immunity approach in its COVID-19 policy. The authors further suggest how it is possible to use social science, natural science and political ideology as complementary in COVID-19 mitigation in particular and in sustainability strategies in general.
Sebastian Jager - One of the best experts on this subject based on the ideXlab platform.
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universal unitarity triangle and physics beyond the standard model
Physics Letters B, 2001Co-Authors: Andrzej J Buras, Paolo Gambino, Martin Gorbahn, Sebastian Jager, Luca SilvestriniAbstract:We make the simple observation that there exists a universal unitarity triangle for all models, like the SM, the Two Higgs Doublet Models I and II and the MSSM with minimal flavour violation, that do not have any new operators beyond those present in the SM and in which all flavour changing transitions are governed by the CKM matrix with no new phases beyond the CKM phase. This universal triangle can be determined in the near future from the ratio (DeltaM)(d)/(DeltaM)(s) and sin 2 beta measured first through the CP asymmetry in B-d(0) --> psi K-S and later in K --> pi nu )over bar> decays. Also suitable ratios of the branching ratios for B --> X(d,s)nu )over bar> and B-d,B-s --> mu (+)mu (-) and the angle gamma measured by means of CP asymmetries in B decays can be used for this determination. Comparison of this universal triangle with the nonuniversal triangles extracted in each model using epsilon, (DeltaM)(d) and various branching ratios for rare decays will allow to find out in a Transparent Manner which of these models, if any, is singled out by experiment. A virtue of the universal triangle is that it allows to separate the determination of the CKM parameters from the determination of new parameters present in the extensions of the SM considered here.
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universal unitarity triangle and physics beyond the standard model
arXiv: High Energy Physics - Phenomenology, 2000Co-Authors: Andrzej J Buras, Paolo Gambino, Martin Gorbahn, Sebastian Jager, Luca SilvestriniAbstract:We make the simple observation that there exists a universal unitarity triangle for all models, like the SM, the Two Higgs Doublet Models I and II and the MSSM with minimal flavour violation, that do not have any new operators beyond those present in the SM and in which all flavour changing transitions are governed by the CKM matrix with no new phases beyond the CKM phase. This universal triangle can be determined in the near future from the ratio (Delta M)_d/(Delta M)_s and sin(2 beta) measured first through the CP asymmetry in B_d^0 to psi K_S and later in K to pi nu nubar decays. Also suitable ratios of the branching ratios for B to X_{d,s} nu nubar and B_{d,s} to mu^+ mu^- and the angle gamma measured by means of CP asymmetries in B decays can be used for this determination. Comparison of this universal triangle with the non-universal triangles extracted in each model using epsilon, (Delta M)_d and various branching ratios for rare decays will allow to find out in a Transparent Manner which of these models, if any, is singled out by experiment. A virtue of the universal triangle is that it allows to separate the determination of the CKM parameters from the determination of new parameters present in the extensions of the SM considered here.
Martin Gorbahn - One of the best experts on this subject based on the ideXlab platform.
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universal unitarity triangle and physics beyond the standard model
Physics Letters B, 2001Co-Authors: Andrzej J Buras, Paolo Gambino, Martin Gorbahn, Sebastian Jager, Luca SilvestriniAbstract:We make the simple observation that there exists a universal unitarity triangle for all models, like the SM, the Two Higgs Doublet Models I and II and the MSSM with minimal flavour violation, that do not have any new operators beyond those present in the SM and in which all flavour changing transitions are governed by the CKM matrix with no new phases beyond the CKM phase. This universal triangle can be determined in the near future from the ratio (DeltaM)(d)/(DeltaM)(s) and sin 2 beta measured first through the CP asymmetry in B-d(0) --> psi K-S and later in K --> pi nu )over bar> decays. Also suitable ratios of the branching ratios for B --> X(d,s)nu )over bar> and B-d,B-s --> mu (+)mu (-) and the angle gamma measured by means of CP asymmetries in B decays can be used for this determination. Comparison of this universal triangle with the nonuniversal triangles extracted in each model using epsilon, (DeltaM)(d) and various branching ratios for rare decays will allow to find out in a Transparent Manner which of these models, if any, is singled out by experiment. A virtue of the universal triangle is that it allows to separate the determination of the CKM parameters from the determination of new parameters present in the extensions of the SM considered here.
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universal unitarity triangle and physics beyond the standard model
arXiv: High Energy Physics - Phenomenology, 2000Co-Authors: Andrzej J Buras, Paolo Gambino, Martin Gorbahn, Sebastian Jager, Luca SilvestriniAbstract:We make the simple observation that there exists a universal unitarity triangle for all models, like the SM, the Two Higgs Doublet Models I and II and the MSSM with minimal flavour violation, that do not have any new operators beyond those present in the SM and in which all flavour changing transitions are governed by the CKM matrix with no new phases beyond the CKM phase. This universal triangle can be determined in the near future from the ratio (Delta M)_d/(Delta M)_s and sin(2 beta) measured first through the CP asymmetry in B_d^0 to psi K_S and later in K to pi nu nubar decays. Also suitable ratios of the branching ratios for B to X_{d,s} nu nubar and B_{d,s} to mu^+ mu^- and the angle gamma measured by means of CP asymmetries in B decays can be used for this determination. Comparison of this universal triangle with the non-universal triangles extracted in each model using epsilon, (Delta M)_d and various branching ratios for rare decays will allow to find out in a Transparent Manner which of these models, if any, is singled out by experiment. A virtue of the universal triangle is that it allows to separate the determination of the CKM parameters from the determination of new parameters present in the extensions of the SM considered here.
