Conditions for evading the limits on the scale of new physics

Wudka, José

doi:10.1088/0954-3899/31/12/002

Cited by 7 publications

(11 citation statements)

References 20 publications

(67 reference statements)

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“…We do not pretend to provide a complete list of operators but concentrate instead on those low-dimensional TLGOs with two leptons and any number of bosons and derivatives that can be probed experimentally and provide leading effects for wide classes of interesting heavy physics. In the following we will assume that the low-energy 7 For example, if there is a discrete symmetry under which all the SM particles are singlets but none of the new particles are [124]. 8 This means that radiative effects generated by the heavy excitations are too small to be observed, it does not preclude direct observation of new particles (provided the energy available is high enough).…”

Section: Er40837 Aa Is Supported By the Micinn Under The Fpu Promentioning

confidence: 99%

Effective Lagrangian approach to neutrinoless double beta decay and neutrino masses

Águila

Aparici

Bhattacharya

et al. 2012

J. High Energ. Phys.

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Neutrinoless double beta (0νββ) decay can in general produce electrons of either chirality, in contrast with the minimal Standard Model (SM) extension with only the addition of the Weinberg operator, which predicts two left-handed electrons in the final state. We classify the lepton number violating (LNV) effective operators with two leptons of either chirality but no quarks, ordered according to the magnitude of their contribution to 0νββ decay. We point out that, for each of the three chirality assignments, e L e L , e L e R and e R e R , there is only one LNV operator of the corresponding type to lowest order, and these have dimensions 5, 7 and 9, respectively. Neutrino masses are always induced by these extra operators but can be delayed to one or two loops, depending on the number of RH leptons entering in the operator. Then, the comparison of the 0νββ decay rate and neutrino masses should indicate the effective scenario at work, which confronted with the LHC searches should also eventually decide on the specific model elected by nature. We also list the SM additions generating these operators upon integration of the heavy modes, and discuss simple realistic examples of renormalizable theories for each case.

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Section: Er40837 Aa Is Supported By the Micinn Under The Fpu Promentioning

confidence: 99%

Effective Lagrangian approach to neutrinoless double beta decay and neutrino masses

Águila

Aparici

Bhattacharya

et al. 2012

J. High Energ. Phys.

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“…During the final stage of this project, Ref. [8] appeared which also pointed out the possibility of imposing a new symmetry at the TeV scale to lower the scale of new physics while evading constraints from precision measurements. The discussion there parallels ours in Sec.…”

Section: Introductionmentioning

confidence: 99%

TeV symmetry and the little hierarchy problem

Cheng¹,

Low²

2003

J. High Energy Phys.

540

503

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Constraints from precision electroweak measurements reveal no evidence for new physics up to 5 -7 TeV, whereas naturalness requires new particles at around 1 TeV to address the stability of the electroweak scale. We show that this "little hierarchy problem" can be cured by introducing a symmetry for new particles at the TeV scale. As an example, we construct a little Higgs model with this new symmetry, dubbed T -parity, which naturally solves the little hierarchy problem and, at the same time, stabilize the electroweak scale up to 10 TeV. The model has many important phenomenological consequences, including consistency with the precision data without any finetuning, a stable weakly-interacting particle as the dark matter candidate, as well as collider signals completely different from existing little Higgs models, but rather similar to the supersymmetric theories with conserved R-parity.

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“…This problem can be circumvented by imposing a discrete symmetry, called T-parity [4,3]. Under this symmetry, the Standard Model (SM) fields are T-even, while the new TeVscale particles are odd, effectively forbidding all tree-level interactions between one of the…”

Section: Introductionmentioning

confidence: 99%

Consequences of T-parity breaking in the Littlest Higgs model

Freitas¹,

Schwaller²,

Wyler³

2008

J. High Energy Phys.

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In this paper we consider the effects of the T-parity violating anomalous Wess-Zumino-Witten term in the Littlest Higgs model. Apart from tree level processes, the loop induced decays of the heavy mirror particles into light standard model fermions lead to a new and rich phenomenology in particular at breaking scales f below 1 TeV. Various processes are calculated and their signatures at present and future colliders are discussed. As a byproduct we find an alternative production mechanism for the Higgs boson.

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Conditions for evading the limits on the scale of new physics

Cited by 7 publications

References 20 publications

Effective Lagrangian approach to neutrinoless double beta decay and neutrino masses

Effective Lagrangian approach to neutrinoless double beta decay and neutrino masses

TeV symmetry and the little hierarchy problem

Consequences of T-parity breaking in the Littlest Higgs model

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