<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msub><mml:mi>B</mml:mi><mml:mi>s</mml:mi></mml:msub></mml:math> mixing phase and lepton flavor violation in supersymmetric SU(5)

Park, Jae hyeon; Yamaguchi, Masahiro

doi:10.1016/j.physletb.2008.11.023

“…The consequences of a large top Yukawa coupling (studied in minimal SU (5) and SO(10) models) in conjunction JHEP06(2011)044 approximate GUT relation δ d ij RR ≈ δ ℓ ij LL (which is not necessarily true with large mixing and is not invariant under the RG) the ratio of the B d and B s mixing frequencies is correlated to the corresponding ratio of the LFV decays τ → e(µ)γ. In [69,70] the RG-induced flavour violation is studied in conjunction with dimension-5 Yukawa terms and the corresponding soft SUSY-breaking terms. These papers find that given the constraint from B(τ → µγ) the impact on B s −B s mixing is maximal for a particular value of the ratio mg/m 0 around 0.3.…”

Section: Comparison With Other Gut Analysesmentioning

confidence: 99%

Flavor Physics in an SO(10) Grand Unified Model

Girrbach¹

2012

Proceedings of XXIst International Europhysics Conference on High Energy Physics — PoS(EPS-HEP2011)

0

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In supersymmetric grand-unified models, the lepton mixing matrix can possibly affect flavor-changing transitions in the quark sector. We present a detailed analysis of a model proposed by Chang, Masiero and Murayama, in which the near-maximal atmospheric neutrino mixing angle governs large new b → s transitions. Relating the supersymmetric low-energy parameters to seven new parameters of this SO(10) GUT model, we perform a correlated study of several flavor-changing neutral current (FCNC) processes. We find the current bound on B(τ → µγ) more constraining than B(B → X s γ). The LEP limit on the lightest Higgs boson mass implies an important lower bound on tan β, which in turn limits the size of the new FCNC transitions. Remarkably, the combined analysis does not rule out large effects in B s −B s mixing and we can easily accomodate the large CP phase in the B s −B s system which has recently been inferred from a global analysis of CDF and DØ data. The model predicts a particle spectrum which is different from the popular Constrained Minimal Supersymmetric Standard Model (CMSSM). B(τ → µγ) enforces heavy masses, typically above 1 TeV, for the sfermions of the degenerate first two generations. However, the ratio of the third-generation and first-generation sfermion masses is smaller than in the CMSSM and a (dominantly right-handed) stop with mass below 500 GeV is possible.

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New physics in B 0 s → J/ψϕ: a general analysis

Chiang

¹

,

Datta

²

,

Duraisamy

³

et al. 2010

J. High Energ. Phys.

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Recently, the CDF and D0 collaborations measured indirect CP violation in B 0 s → J/ψφ and found a hint of a signal. If taken at face value, this can be interpreted as a nonzero phase of B 0 s -B 0 s mixing (β s ), in disagreement with the standard model, which predicts that β s ≃ 0. In this paper, we argue that this analysis may be incomplete. In particular, there can be new physics (NP) in theb →scc decay. If so, the value of β s is different than for the case in which NP is assumed to be present only in the mixing. We have examined several models of NP and found that, indeed, there can be significant contributions to the decay. These effects are consistent with measurements in B → J/ψK * and B

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Flavor physics in an SO(10) grand unified model

Girrbach

¹

,

Jäger

²

,

Knopf

³

et al. 2011

J. High Energ. Phys.

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In supersymmetric grand-unified models, the lepton mixing matrix can possibly affect flavor-changing transitions in the quark sector. We present a detailed analysis of a model proposed by Chang, Masiero and Murayama, in which the near-maximal atmospheric neutrino mixing angle governs large new b → s transitions. Relating the supersymmetric low-energy parameters to seven new parameters of this SO(10) GUT model, we perform a correlated study of several flavor-changing neutral current (FCNC) processes. We find the current bound on B(τ → µγ) more constraining than B(B → X s γ). The LEP limit on the lightest Higgs boson mass implies an important lower bound on tan β, which in turn limits the size of the new FCNC transitions. Remarkably, the combined analysis does not rule out large effects in B s −B s mixing and we can easily accomodate the large CP phase in the B s −B s system which has recently been inferred from a global analysis of CDF and DØ data. The model predicts a particle spectrum which is different from the popular Constrained Minimal Supersymmetric Standard Model (CMSSM). B(τ → µγ) enforces heavy masses, typically above 1 TeV, for the sfermions of the degenerate first two generations. However, the ratio of the third-generation and first-generation sfermion masses is smaller than in the CMSSM and a (dominantly right-handed) stop with mass below 500 GeV is possible.

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Bs mixing phase and lepton flavor violation in supersymmetric SU(5)

Cited by 12 publications

References 33 publications

Flavor Physics in an SO(10) Grand Unified Model

Flavor Physics in an SO(10) Grand Unified Model

New physics in B 0 s → J/ψϕ: a general analysis

Flavor physics in an SO(10) grand unified model

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