Universal unitarity triangle and physics beyond the standard model

Buras, Andrzej J.; Gambino, Paolo; Gorbahn, Martin; Jäger, Sebastian; Silvestrini, L.

doi:10.1016/s0370-2693(01)00061-2

Cited by 522 publications

(771 citation statements)

References 38 publications

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“…In practice, the most convenient strategy in this case is to fit the shift in the Inami-Lim topquark function entering B d , B s and K 0 mixing. We fit for this shift using the experimental measurements of ∆m d , ∆m s and ǫ K , after determining the parameters of the CKM matrix with the universal unitarity triangle analysis [17]. 7 We obtain the following lower bounds at 95% probability:…”

Section: Resultsmentioning

confidence: 99%

Model-independent constraints on ΔF= 2 operators and the scale of new physics

Bóna¹,

Ciuchini²,

Franco³

et al. 2008

J. High Energy Phys.

447

347

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Froggatt-Nielsen mechanism in a model with SU(3)c×SU(3)L×U (1) Abstract: We update the constraints on new-physics contributions to ∆F = 2 processes from the generalized unitarity triangle analysis, including the most recent experimental developments. Based on these constraints, we derive upper bounds on the coefficients of the most general ∆F = 2 effective Hamiltonian. These upper bounds can be translated into lower bounds on the scale of new physics that contributes to these low-energy effective interactions. We point out that, due to the enhancement in the renormalization group evolution and in the matrix elements, the coefficients of non-standard operators are much more constrained than the coefficient of the operator present in the Standard Model. Therefore, the scale of new physics in models that generate new ∆F = 2 operators, such as next-to-minimal flavour violation, has to be much higher than the scale of minimal flavour violation, and it most probably lies beyond the reach of direct searches at the LHC.

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Section: Resultsmentioning

confidence: 99%

Model-independent constraints on ΔF= 2 operators and the scale of new physics

Bóna¹,

Ciuchini²,

Franco³

et al. 2008

J. High Energy Phys.

447

347

View full text Add to dashboard Cite

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“…A more appealing scenario is to assume that the new flavor-changing couplings appearing in SM extensions are suppressed by some symmetry principle. The most restrictive and predictive symmetry principle of this type is the so-called Minimal Flavor Violation (MFV) hypothesis [1,2,3]: the assumption that the SM Yukawa couplings are the only sources of quark-flavor symmetry breaking. In this case all the cancellations that render FCNC automatically small in the SM apply just as well to the new degrees of freedom, allowing for very reasonable mass scales of the new particles.…”

Section: Introductionmentioning

confidence: 99%

Minimal flavor violation in the lepton sector

Cirigliano

Grinstein²,

Isidori³

et al. 2005

Nuclear Physics B

325

697

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We extend the notion of Minimal Flavor Violation to the lepton sector. We introduce a symmetry principle which allows us to express lepton flavor violation in the charged lepton sector in terms of neutrino masses and mixing angles. We explore the dependence of the rates for flavor changing radiative charged lepton decays (ℓ i → ℓ j γ) and µ-to-e conversion in nuclei on the scales for total lepton number violation, lepton flavor violation and the neutrino masses and mixing angles. Measurable rates are obtained when the scale for total lepton number violation is much larger than the scale for lepton flavor violation.

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“…In particular, flavor changing neutral current bounds such as those arising from K 0 −K 0 mixing impose strong constraints, M ≥ 10 4 TeV. These bounds can be relaxed by restricting the higher dimensional operator basis through adopting the MFV hypothesis [19,20,21,22,23,24,25,26,27,28]. This allows one to consider M to be a few TeV while naturally suppressing FCNC.…”

Section: Introductionmentioning

confidence: 99%

Higgs-Higgs bound state due to new physics at a TeV

2007

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We examine the effects of new physics on the Higgs sector of the standard model, focusing on the effects on the Higgs self couplings. We demonstrate that a low mass higgs, m h < 2 m t , can have a strong effective self coupling due to the effects of a new interaction at a TeV. We investigate the possibility that the first evidence of such an interaction could be a higgs-higgs bound state.To this end, we construct an effective field theory formalism to examine the physics of such a low mass higgs boson. We explore the possibility of a non relativistic bound state of the higgs field (Higgsium) at LHC and construct a non relativistic effective field theory of the higgs sector that is appropriate for such studies (NRHET).

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Universal unitarity triangle and physics beyond the standard model

Cited by 522 publications

References 38 publications

Model-independent constraints on ΔF= 2 operators and the scale of new physics

Model-independent constraints on ΔF= 2 operators and the scale of new physics

Minimal flavor violation in the lepton sector

Higgs-Higgs bound state due to new physics at a TeV

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