Correlation between lepton flavor violation and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msub><mml:mi>B</mml:mi><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mi>d</mml:mi><mml:mo>,</mml:mo><mml:mi>s</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:msub><mml:mtext>–</mml:mtext><mml:msub><mml:mover accent="true"><mml:mi>B</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mi>d</mml:mi><mml:mo>,</mml:mo

Cheung, Kingman; Kang, Sin Kyu; Kim, C. S.; Lee, Jake

doi:10.1016/j.physletb.2007.06.081

“…The Yukawa sector is less constrained than in the CMM model and therefore the correlations between different FCNC observables are weaker. Like us and in contrast to [66][67][68], the authors of [71] find that the current upper bound on B(τ → µγ) still permits a sizable CP phase in B s −B s mixing. In [71] also FCNC transitions among the first and second generation are studied, e.g.…”

Section: Comparison With Other Gut Analysesmentioning

confidence: 64%

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.

show abstract

“…The idea of universal soft breaking terms at M Pl and flavor-violation from y t -driven RG running above M GUT has been studied by many authors, both in SU(5) and SO(10) scenarios [10,[12][13][14]18,22,[51][52][53][54]. A detailed comparison of our results with the literature will be given in Sec.…”

Section: Parameters At M Gutmentioning

confidence: 82%

“…These papers are different in spirit to [10,[12][13][14]18,22,51,52,54] and this paper, all of which employ RG effects above M GUT . Here we discuss two of these papers with particular emphasis on flavor physics: In [80] correlations of quark and lepton FCNCs are studied in SU(5) SUSY GUTs, but without neutrinos (and thus without the PMNS matrix).…”

Section: Comparison With Other Gut Analysesmentioning

confidence: 84%

“…This is in sharp contrast to the situation found by us in the CMM model. The work [51] also studies the possibility that in SUSY GUT models with heavy right-handed neutrinos the large atmospheric mixing angle can affect b → s transitions due to a large Dirac neutrino Yukawa coupling (which in our case is equal to the top Yukawa coupling). Using the mass insertion approximation, the correlation of new physics effects in B q −B q -mixing (q = d, s) and the radiative decays τ → e(µ)γ is discussed.…”

Section: Comparison With Other Gut Analysesmentioning

confidence: 99%

See 1 more Smart Citation

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.

show abstract

“…Assuming the discovery of a squark-like state at the LHC, e.g., through the channel mentioned above, it will be crucial to understand its exact nature and in particular reveal its flavour content. This information will give important hints towards the flavour structure of the underlying theory and will hint towards possible Grand Unification frameworks [17,[38][39][40][41][42][43][44][45][46][47][48]. It is the main goal of the present Paper to investigate different methods for reconstructing the flavour content of an observed squark state.…”

Section: Introductionmentioning

confidence: 95%

First steps towards the reconstruction of the squark flavour structure

Bernigaud

¹

,

Herrmann

²

2019

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Assuming the observation of a squark at the Large Hadron Collider, we investigate methods to access its flavour content and thus gain information on the underlying flavour structure of the theory. Based on simple observables, we apply a likelihood inference method to determine the top-flavour content of the observed particle. In addition, we employ a multivariate analysis in order to classify different flavour hypotheses. Both methods are discussed within a simplified model and the more general Minimal Supersymmetric Standard Model including most general squark mixing. We conclude that the likelihood inference may provide an estimation of the top-flavour content if additional knowledge, especially on the gaugino sector is available, while the multivariate analysis identifies different flavour patterns and can accommodate a more minimalistic set of observables.

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Correlation between lepton flavor violation and B(d,s)–B¯(d,

Cited by 12 publications

References 37 publications

Flavor Physics in an SO(10) Grand Unified Model

Flavor Physics in an SO(10) Grand Unified Model

Flavor physics in an SO(10) grand unified model

First steps towards the reconstruction of the squark flavour structure

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