The flavor of a little Higgs with T-parity

Gil Paz; Jay Hubisz; Seung J. Lee

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The flavor of a little Higgs with T-parity

Jay Hubisz, Seung J. Lee, Gil Paz

High Energy Physics - Phenomenology · Submitted 14 Dec 2005

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim We find that for a generic choice of textures, a TeV scale GIM suppression is necessary to avoid large contributions.

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What the abstract itself states, as probabilities: claims first 0.02 · states limitation 0.57 · human participants 0.01 · controlled comparison 0.19 · randomized assignment 0.01 · states quantitative result 0.95 · compares with prior results 0.54 · mentions code or data availability 0.02.

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We analyze flavor constraints in the littlest Higgs model with T-parity. In particular, we focus on neutral meson mixing in the K, B, and D systems due to one loop contributions from T-parity odd fermions and gauge bosons. We calculate the short distance contributions to mixing for a general choice of T-odd fermion Yukawa couplings. We find that for a generic choice of textures, a TeV scale GIM suppression is necessary to avoid large contributions. If order one mixing angles are allowed in the extended flavor structure, the mass spectrum is severely constrained, and must be degenerate at the 1-5% level. However, there are still regions of parameter space where only a loose degeneracy is necessary to avoid constraints. We also consider the B(s) system, and identify a scenario in which the mixing can be significantly enhanced beyond the standard model prediction while still satisfying bounds on the other mixing observables. We present both analytical and numerical results as functions of the T-odd fermion mass eigenvalues.

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What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	We analyze flavor constraints in the littlest Higgs model with T-parity.	contribution 0.98	0.91	0.04	asserted 0.69
s1	In particular, we focus on neutral meson mixing in the K, B, and D systems due to one loop contributions from T-parity odd fermions and gauge bosons.	contribution 0.78	0.70	0.04	asserted 0.92
s2	We calculate the short distance contributions to mixing for a general choice of T-odd fermion Yukawa couplings.	method 0.68	0.96	0.03	asserted 0.96
s3	We find that for a generic choice of textures, a TeV scale GIM suppression is necessary to avoid large contributions.	result 0.90	0.95	0.43	asserted 1.00
s4	If order one mixing angles are allowed in the extended flavor structure, the mass spectrum is severely constrained, and must be degenerate at the 1-5% level.	result 0.98	0.89	0.27	asserted 0.98
s5	However, there are still regions of parameter space where only a loose degeneracy is necessary to avoid constraints.	result 0.96	0.86	0.13	asserted 0.91
s6	We also consider the B(s) system, and identify a scenario in which the mixing can be significantly enhanced beyond the standard model prediction while still satisfying bounds on the other mixing observables.	result 0.92	0.93	0.13	asserted 0.90
s7	We present both analytical and numerical results as functions of the T-odd fermion mass eigenvalues.	contribution 0.57	0.95	0.04	asserted 0.99

What kind of paper the classifier reports this is: theoretical result 1.00 · evidence from proof or derivation 0.75.

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The paper

Original abstract

We analyze flavor constraints in the littlest Higgs model with T-parity. In particular, we focus on neutral meson mixing in the K, B, and D systems due to one loop contributions from T-parity odd fermions and gauge bosons. We calculate the short distance contributions to mixing for a general choice of T-odd fermion Yukawa couplings. We find that for a generic choice of textures, a TeV scale GIM suppression is necessary to avoid large contributions. If order one mixing angles are allowed in the extended flavor structure, the mass spectrum is severely constrained, and must be degenerate at the 1-5% level. However, there are still regions of parameter space where only a loose degeneracy is necessary to avoid constraints. We also consider the B(s) system, and identify a scenario in which the mixing can be significantly enhanced beyond the standard model prediction while still satisfying bounds on the other mixing observables. We present both analytical and numerical results as functions of the T-odd fermion mass eigenvalues.

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References

Forward citations

Cited by 10 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

Higgs Boson Production and Decay in Little Higgs Models with T-parity
hep-ph 2006-02 conditional novelty 7.0 of 10

In a Littlest Higgs model with T-parity, the Higgs boson production cross section via gluon fusion is reduced by up to about 45%, and the branching ratio to two photons can be enhanced by about 35%.
Flavored dark matter beyond Minimal Flavor Violation
hep-ph 2014-05 conditional novelty 6.0 of 10

A general dark-matter-quark coupling matrix can satisfy all meson-antimeson mixing constraints if it falls into one of five structural patterns: universality, small mixing, or one of three two-flavor degeneracies.
Symmetries and Asymmetries of B -> K* mu+ mu- Decays in the Standard Model and Beyond
hep-ph 2008-11 accept novelty 6.0 of 10

A complete basis of CP-averaged and CP-violating angular observables for B -> K* mu+ mu- is defined, computed in the Standard Model with full form factors, and shown to discriminate among new-physics scenarios.
Little Higgs Dark Matter
hep-ph 2006-03 conditional novelty 6.0 of 10

The T-odd heavy photon in the Littlest Higgs model with T parity is a viable WIMP dark matter candidate whose relic abundance matches WMAP data in two Higgs-resonance bands and a coannihilation tail, with gamma-ray si...
A Fermionic Top Partner: Naturalness and the LHC
hep-ph 2012-04 conditional novelty 5.0 of 10

Combining precision electroweak, flavor, and LHC constraints, a fermionic top partner below roughly 500 GeV is excluded, yet a 125 GeV Higgs in this model requires only about 20% fine-tuning.

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Delta F = 2 observables and B -> X_q gamma decays in the Left-Right Model: Higgs particles striking back
hep-ph 2011-11 conditional novelty 5.0 of 10

In the left-right model, tree-level heavy neutral Higgs exchange dominates Delta F = 2 observables even for Higgs masses near 20 TeV, and viable parameter regions exist for W_R masses of 2-3 TeV.
Implications of D^0-\bar D^0 Mixing for New Physics
hep-ph 2007-05 conditional novelty 5.0 of 10

Using the 2007 evidence for D0 mixing, the authors derive upper bounds on new-physics contributions to the charm mass difference for about twenty models, several of which beat competing constraints.
Quark flavour observables in the Littlest Higgs model with T-parity after LHC Run 1
hep-ph 2015-07 accept novelty 4.0 of 10

With LHC Run 1 bounds and updated lattice input, the T-parity Littlest Higgs model can still shift rare kaon branching ratios substantially but cannot reproduce the observed B-meson anomalies and favours an enhanced B...
Composite Higgses
hep-ph 2014-01 accept novelty 3.0 of 10

Composite Higgs models are classified by their Higgs potential and Yukawa structure, and every variant, including little, holographic, twin, and dilatonic Higgs, requires fine-tuning of at least a few percent.
B, D and K decays
hep-ph 2008-01 accept novelty 3.0 of 10

A community review that fixes the pre-LHC status of quark-flavour physics, catalogues the benchmark rare decays most sensitive to new physics, and quantifies the hadronic uncertainties that limit them.

How the literature uses it

18 arXiv papers cite this in 28 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 20 sentences without a confident label

Uses its method or tool 1 paper

This model is implemented based on Ref. [ref] using the Feynman rules from [ref] .

The Physics of Herwig 7 · Little Higgs Models · 0.96

Cites it as support 1 paper

This is motivated by constraints from flavor-changing neutral currents in the LHT model [ref] , as well as desire for maximal simplicity.

T-Quarks at the Large Hadron Collider: 2010-12 · Introduction · 1.00

Cites it as background 5 papers

Here we briefly review the structure of the LHT model relevant to our analysis, and the detailed description can be found in the literature [ref] .

Flavor changing top quark decay and bottom-strange production in the littlest Higgs model with T-parity · Brief review of the model · 1.00
A prominent example of this class of models is the Littlest Higgs model with T-parity [ref] in which the interactions between SM quarks and heavy mirror quarks, mediated by new heavy charged and neutral gauge bosons, involve a new mixing matrix that differs from the CKM matrix [ref] and is parameterized by three new mixing angles and three new CP-violating phases [ref] .

Symmetries and Asymmetries of B -> K* mu+ mu- Decays in the Standard Model and Beyond · Littlest Higgs Model with T–Parity (LHT) · 0.97
In the early literature on this subject various observable quantities of FCNC and LFV processes were calculated in the LHT and showed that the effects of T-odd partners can be sizable and the correlations among various observable quantities can be different from other new physics model such as supersymmetric (SUSY) models [ref] .

Tau and muon lepton flavor violations in the littlest Higgs model with T-parity · Introduction · 0.87

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