Effects of supergravity-induced electroweak breaking on rare b-decays and mixings

Bertolini, Stefano; Borzumati, Francesca; Masiero, A.; Ridolfi, Giovanni

doi:10.1016/0550-3213(91)90320-w

Cited by 703 publications

(899 citation statements)

References 92 publications

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“…• BR(b → sγ) and A CP (b → sγ): It has been known for quite some time that b → sγ provides important tests of supersymmetry [227,228]. The leading SM contribution to the branching ratio appears at one loop level, with the characteristic Cabibbo suppression.…”

Section: Constraints From Fc Processesmentioning

confidence: 99%

“…Superpartners and charged Higgs loops generically contribute to b → sγ, at a level competitive with the SM, with contributions that depend strongly on the parameters of L sof t , as well as µ and tan β. This process has been most often studied in the MFV scenario at LO [228,233], in certain limits at NLO [234], and including large tan β enhanced two-loop supersymmetry contributions [235,236], and all-order resummation of tan β enhanced QCD corrections [237].…”

Section: Constraints From Fc Processesmentioning

confidence: 99%

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The soft supersymmetry-breaking Lagrangian: theory and applications

Chung

Everett

Kane³

et al. 2005

Physics Reports

415

339

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After an introduction recalling the theoretical motivation for low energy (100 GeV to TeV scale) supersymmetry, this review describes the theory and experimental implications of the soft supersymmetry-breaking Lagrangian of the general minimal supersymmetric standard model (MSSM). Extensions to include neutrino masses and nonminimal theories are also discussed. Topics covered include models of supersymmetry breaking, phenomenological constraints from electroweak symmetry breaking, flavor/CP violation, collider searches, and cosmological constraints including dark matter and implications for baryogenesis and inflation.

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Section: Constraints From Fc Processesmentioning

confidence: 99%

Section: Constraints From Fc Processesmentioning

confidence: 99%

The soft supersymmetry-breaking Lagrangian: theory and applications

Chung

Everett

Kane³

et al. 2005

Physics Reports

415

339

View full text Add to dashboard Cite

show abstract

“…These contributions can either increase or decrease the b ! s decay rate compared with the Standard Model expectation [20,21].…”

Section: Radiative C Harmless Decaysmentioning

confidence: 99%

Study of rareb decays with the DELPHI detector at LEP

Adam

Adye

Agasi

et al. 1996

Z. Phys. C - Particles and Fields

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Rare decays of beauty particles were studied in several charmless modes using the data collected with the DELPHI detector at LEP from 1991 to 1994. respectively. The fraction of these decays with a charged kaon in the nal state that is not from the spectator s quark, was measured to be 0:58 0:18. Upper limits were set at 90% con dence level on the branching ratios for three and four body charmless hadronic decays in the range of (1 3 To be submitted to Zeit. f. Physik C ii

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“…The coefficients C 0,e f f 7,8 (µ b ) have an important property and it is that they are quite similar in many interesting extensions of the SM, such as 2HDM or the MSSM [21][22][23] and therefore it is possible to parametrize the new contributions using new fuctions C 0,1 i, j (µ W ) with i = 7, 8 and j = YY, XY . These functions depend on the unknown parameter m ± H and also on the size and sign fo the couplings X and Y that in the case of the model III under study they are X = −λ bb , and Y = λ tt .…”

mentioning

confidence: 99%

Leptonic decays of the B charged meson and B → Xsγ in the Two Higgs Doublet Model type III

2008

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We consider the Two Higgs Doublet Model (2HDM) of type III which leads to Flavour Changing Neutral Currents (FCNC) at tree level. In the framework of this model we calculate the NLO contribution for b → sγ and the branchings for the meson decays B + → l + ν. We examine the limits on the new parameters λ bb and M H ± . We take into account the relationship between λ tt and λ bb coming from the validness of perturbation theory.Keywords: B Meson decay; 2HDM type III; Charged Higgs mass The Standard Model (SM) of particle physics based on the gauge group SU(3) c × SU(2) L × U(1) Y makes fit the symmetry breaking by including a fundamental weak doublet of scalar Higgs bosons φ with a scalar potential V (φ) = λ(φ † φ − 1 2 v 2 ) 2 . However, the SM does not explain the dynamics responsible for the generation of masses. Between the models beyond the SM, many of them include more than one scalar Higgs doublet; for instance, the case of the minimal supersymmetric standard model (MSSM)). We consider one of these extensions which has a richer scalar sector, called generically as the Two Higgs Doublet Model (2HDM). There are several kinds of such 2HDM models. In the model called type I, one Higgs doublet provides masses to the up and down quarks, simultaneously. In the model type II, one Higgs doublet gives masses to the up type quarks and the other one to the down type quarks. These two models include a discrete symmetry to avoid flavour changing neutral currents (FCNC) at tree level [1]. However, the addition of these discrete symmetries is not compulsory and in this case both doublets are contributing to generate the masses for up-type and down-type quarks. In the literature, such a model is known as the 2HDM type III [2]. It has been used to search for physics beyond the SM and specifically for FCNC at tree level [3][4][5]. In general, both doublets can acquire a vacuum expectation value (VEV), but one of them can be absorbed redefining the Higgs boson fields properly. Nevertheless, other studies on 2HDM-III using different basis have been done and there is a case where both doublets get VEVs that allows to study the models type I and II in a specific limit [5,6].In the 2HDM models, the two complex Higgs doublets correspond to eigth scalar states. Spontanoues Symmetry breaking procedure leads to five Higgs fields: two neutral CP-even scalars h 0 and H 0 , a neutral CP-odd scalar A 0 , and two charged scalars H ± . While the neutral Higgs bosons may be difficult to distinguish from the one of the SM, the charged Higgs bosons would have a distinctive signal for physics beyond the SM. Therefore the direct or indirect evidence of a charged Higgs boson would play an important role in the discovery of an extended Higgs sector. Direct searches have carried out by LEP collaborations and they reported a combined lower limit on M H ± of 78.6 GeV [7] assuming H + → τ + ν τ (cs). At the Tevatron, the direct searches for charged Higgs boson are based on pp → tt where at least one top quark decay can be used in order to look for the...

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Effects of supergravity-induced electroweak breaking on rare b-decays and mixings

Cited by 703 publications

References 92 publications

The soft supersymmetry-breaking Lagrangian: theory and applications

The soft supersymmetry-breaking Lagrangian: theory and applications

Study of rareb decays with the DELPHI detector at LEP

Leptonic decays of the B charged meson and B → Xsγ in the Two Higgs Doublet Model type III

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