Quark and lepton masses from top loops

Dobrescu, Bogdan A.; Fox, Patrick J.

doi:10.1088/1126-6708/2008/08/100

Cited by 51 publications

(32 citation statements)

References 35 publications

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“…4 only generates a top Yukawa coupling. This mechanism, which is similar to that of previous works such as [5][6][7]15,25], allows a UV theory where all the SM quarks are treated democratically to generate only a top Yukawa coupling at tree level.…”

Section: Top Yukawasupporting

confidence: 58%

“…(15), and F d is analogous to F q , derived from f d in Eq. (15). Our expression for the bottom Yukawa is thus replaced by…”

Section: Diagonalizationmentioning

confidence: 99%

“…This leads to the idea of radiative flavor breaking [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], where only the third generation Yukawa couplings are generated at tree level, while the second generation Yukawas are generated as one-loop effects, and the first generation is a two-loop effect. This is an old idea that has its origins in trying to explain the electron mass as a loop effect of the muon mass [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Split supersymmetry radiates flavor

2014

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Radiative flavor models where the hierarchies of Standard Model (SM) fermion masses and mixings are explained via loop corrections are elegant ways to solve the SM flavor puzzle. Here we build such a model in the context of mini-split supersymmetry (SUSY) where both flavor and SUSY breaking occur at a scale of 1000 TeV. This model is consistent with the observed Higgs mass, unification, and dark matter as a weakly interacting massive particle. The high scale allows large flavor mixing among the sfermions, which provides part of the mechanism for radiative flavor generation. In the deep UV, all flavors are treated democratically, but at the SUSY-breaking scale, the third, second, and first generation Yukawa couplings are generated at tree level, one loop, and two loops, respectively. Save for one, all the dimensionless parameters in the theory are Oð1Þ, with the exception being a modest and technically natural tuning that explains both the smallness of the bottom Yukawa coupling and the largeness of the Cabibbo angle.

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Section: Top Yukawasupporting

confidence: 58%

“…(15), and F d is analogous to F q , derived from f d in Eq. (15). Our expression for the bottom Yukawa is thus replaced by…”

Section: Diagonalizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Split supersymmetry radiates flavor

2014

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“…The story is similar for theories of radiative fermion mass generation [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] in which loop corrections generate the up mass from the charm mass and the charm mass from the top mass, and likewise for the quark mass mixings. In either case, these constructions increase the overall operator dimension of M (φ), and can alleviate explicit PQ violation arising from det M (φ).…”

Section: Jhep06(2010)074mentioning

confidence: 86%

Axion protection from flavor

Cheung

2010

J. High Energ. Phys.

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The QCD axion fails to solve the strong CP problem unless all explicit PQ violating, Planck-suppressed, dimension n < 10 operators are forbidden or have exponentially small coefficients. We show that all theories with a QCD axion contain an irreducible source of explicit PQ violation which is proportional to the determinant of the Yukawa interaction matrix of colored fermions. Generically, this contribution is of low operator dimension and will drastically destabilize the axion potential, so its suppression is a necessary condition for solving the strong CP problem. We propose a mechanism whereby the PQ symmetry is kept exact up to n = 12 with the help of the very same flavor symmetries which generate the hierarchical quark masses and mixings of the SM. This "axion flavor protection" is straightforwardly realized in theories which employ radiative fermion mass generation and grand unification. A universal feature of this construction is that the heavy quark Yukawa couplings are generated at the PQ breaking scale.

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“…Generalizations of Eq. (3.4) appear in non-Standard models that modify the interference phase of B 0 s -B 0 s [14], explain quark masses [15] …”

Section: Pos(lattice 2008)282mentioning

confidence: 97%

Non-Standard Physics in Leptonic Decays

Kronfeld¹

2009

Proceedings of the XXVI International Symposium on Lattice Field Theory — PoS(LATTICE 2008)

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Recent measurements of the branching fraction for D s → ν disagree with the Standard Model expectation, which relies on calculations of f D s from lattice QCD. This paper uses recent preliminary measurements from CLEO and a new preliminary lattice-QCD result from this conference to update the significance of the discrepancy. The " f D s puzzle" stands now at 3.5σ , with σ predominantly from the statistical uncertainty of the experiments. New physics scenarios that could solve the puzzle would also lead to non-Standard amplitudes mediating the semileptonic decays D → K ν. This paper shows where the new amplitudes enter the differential rate and outlines where lattice QCD calculations are needed to confront recent and forthcoming measurements.

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Quark and lepton masses from top loops

Cited by 51 publications

References 35 publications

Split supersymmetry radiates flavor

Split supersymmetry radiates flavor

Axion protection from flavor

Non-Standard Physics in Leptonic Decays

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