Abstract:It is well recognized that looking for new physics at lower energy colliders is a tendency which is complementary to high energy machines such as LHC. Based on large database of BESIII, we may have a unique opportunity to do a good job. In this paper we calculate the branching ratios of semi-leptonic processes D + s → K + e − e + , D + s → K + e − µ + and leptonic processes D 0 → e − e + , D 0 → e − µ + in the frames of U (1) ′ model, 2HDM and unparticle separately. It is found that both the U (1) ′ and 2HDM m… Show more
“…DOI: 10.1103/PhysRevLett.124.231801 In the standard model (SM), the couplings between three families of leptons and gauge bosons are independent of lepton flavors. This property is known as lepton flavor universality (LFU) [1][2][3][4]. Semileptonic (SL) decays of pseudoscalar mesons, which are well understood in the SM, offer an ideal platform to test LFU and search for new physics effects.…”
Section: Southeast University Nanjing 211100 People's Republic Of Cmentioning
“…DOI: 10.1103/PhysRevLett.124.231801 In the standard model (SM), the couplings between three families of leptons and gauge bosons are independent of lepton flavors. This property is known as lepton flavor universality (LFU) [1][2][3][4]. Semileptonic (SL) decays of pseudoscalar mesons, which are well understood in the SM, offer an ideal platform to test LFU and search for new physics effects.…”
Section: Southeast University Nanjing 211100 People's Republic Of Cmentioning
“…D → P and D → PP , SM CP-asymmetries are small, A SM CP ∼ Im λ b λ s ∼ 10 −3 . Further SM null test are given in terms of angular observables, [26,33,35,39,40,48,49,50,51,52,53,54,55,56,57,58,59].…”
Section: Rare Decaysmentioning
confidence: 99%
“…CP asymmetry and forward-backward asymmetry within BSM models. Table is a compilation of the results given in[26,33,35,39,40,48,49,50,51,52,53,54,55,56,57,58,59]. …”
The importance of charm decays in the context of flavor is motivated. A theory overview on recent developments in leptonic and semileptonic decays, hadronic two-body decays, and rare decays is presented. Standard Model (SM) predictions as well as tests of the SM are pointed out, e.g. how to discover direct CP violation in charm decays and how to search for physics beyond the SM. Differences between rare charm and beauty decays are discussed.
“…More model-independent studies, that take into account loop corrections (or equivalently, renormalization group running) have also been performed for µ ↔ e flavour change [46,47]. Finally, with respect to the calculations in this manuscript, the leptonic branching ratio of pseudoscalar mesons is well-known, and can be found in [26,28,48,49] and semi-leptonic branching ratios in various scenarios can be found in [50,51,52,53,54,55,56,57,58].…”
We study lepton flavour violating two-and three-body decays of pseudoscalar mesons in Effective Field Theory (EFT). We give analytic formulae for the decay rates in the presence of a complete basis of QED×QCD-invariant operators. The constraints are obtained at the experimental scale, then translated to the weak scale via one-loop RGEs. The large RGmixing between tensor and (pseudo)scalar operators weakens the constraints on scalar and pseudoscalar operators at the weak scale.
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