Perturbative unitarity constraints on general models and collider implications

Babu, K. S.; Julio, J.; Zhang, Yue

doi:10.1016/j.nuclphysb.2012.01.018

Cited by 14 publications

(10 citation statements)

References 62 publications

(54 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using the results of Ref. [58] we obtain M Q ≤ 5.6 TeV, which is somewhat weaker. In the parity symmetric scenario the mass of the vector like partner of electron is given as Y κ R .…”

mentioning

confidence: 54%

A theory of R(D*, D) anomaly with right-handed currents

Babu

Dutta

Mohapatra

2019

J. High Energ. Phys.

View full text Add to dashboard Cite

We present an ultraviolet complete theory for the R(D * ) and R(D) anomaly in terms of a low mass W ± R gauge boson of a class of left-right symmetric models. These models, which are based on the gauge symmetry SU (3) c × SU (2) L × SU (2) R × U (1) B−L , utilize vector-like fermions to generate quark and lepton masses via a universal seesaw mechanism. A parity symmetric version as well as an asymmetric version are studied. A light sterile neutrino emerges naturally in this setup, which allows for new decay modes of B-meson via righthanded currents. We show that these models can explain R(D * ) and R(D) anomaly while being consistent with LHC and LEP data as well as low energy flavor constraints arising from K L − K S , B d,s −B d,s , D −D mixing, etc., but only for a limited range of the W R mass: 1.2 (1.8) TeV ≤ M W R ≤ 3 TeV for parity asymmetric (symmetric) Yukawa sectors. The light sterile neutrinos predicted by the model may be relevant for explaining the MiniBoone and LSND neutrino oscillation results. The parity symmetric version of the model provides a simple solution to the strong CP problem without relying on the axion. It also predicts an isospin singlet top partner with a mass M T = (1.5 − 2.5)

show abstract

“…Using the results of Ref. [58] we obtain M Q ≤ 5.6 TeV, which is somewhat weaker. In the parity symmetric scenario the mass of the vector like partner of electron is given as Y κ R .…”

mentioning

confidence: 54%

A theory of R(D*, D) anomaly with right-handed currents

Babu

Dutta

Mohapatra

2019

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…It turns out that the contribution proportional to g V DM still cancels in this case and that the leading contribution at high energies becomes proportional to (g A DM ) 2 √ s m DM /m 2 Z . As a result, perturbative unitarity is violated unless [53][54][55]…”

Section: Application To a Simplified Model With A Z Mediatormentioning

confidence: 99%

Implications of unitarity and gauge invariance for simplified dark matter models

Kahlhoefer

Schmidt-Hoberg

Schwetz

et al. 2016

J. High Energ. Phys.

201

263

View full text Add to dashboard Cite

We show that simplified models used to describe the interactions of dark matter with Standard Model particles do not in general respect gauge invariance and that perturbative unitarity may be violated in large regions of the parameter space. The modifications necessary to cure these inconsistencies may imply a much richer phenomenology and lead to stringent constraints on the model. We illustrate these observations by considering the simplified model of a fermionic dark matter particle and a vector mediator. Imposing gauge invariance then leads to strong constraints from dilepton resonance searches and electroweak precision tests. Furthermore, the new states required to restore perturbative unitarity can mix with Standard Model states and mediate interactions between the dark and the visible sector, leading to new experimental signatures such as invisible Higgs decays. The resulting constraints are typically stronger than the 'classic' constraints on DM simplified models such as monojet searches and make it difficult to avoid thermal overproduction of dark matter.

show abstract

“…That is, additional Higgs fields are mandatory for generation of masses of the SM fermions charged under chiral U (1) ′ and the U (1) ′ gauge boson (Z ′ ) itself. The requirement for the extra Higgs fields is also true in the W ′ [11,70], axigluon [47], flavor SU(3) uR [25], and any other models if the SM fermions are chiral under new gauge interactions.…”

Section: +0018mentioning

confidence: 99%

Top A FB at the Tevatron vs. charge asymmetry at the LHC in chiral U(1) flavor models with flavored Higgs doublets

Ko¹,

Omura²,

Yu³

2013

Eur. Phys. J. C

View full text Add to dashboard Cite

We consider the top forward-backward (FB) asymmetry at the Tevatron and top charge asymmetry at the LHC within chiral U(1)′ models with flavor-dependent U(1) ′ charges and flavored Higgs fields, which were introduced in the Ref. [68]. In this model, one has to include the flavor changing couplings of the Higgs bosons as well as the Z ′ to the up-type quarks. The models could enhance not only the top forward-backward asymmetry at Tevatron, but also the top charge asymmetry at LHC, without too large same-sign top-quark pair production rates. Also the m tt distribution at high m tt show less deviations from the SM predictions. We identify parameter spaces for the U (1) ′ gauge boson and (pseudo)scalar Higgs bosons where all the experimental data could be accommodated, including the case with about 125 GeV Higgs boson, as suggested recently by ATLAS and CMS.

show abstract

Perturbative unitarity constraints on general models and collider implications

Cited by 14 publications

References 62 publications

A theory of R(D*, D) anomaly with right-handed currents

A theory of R(D*, D) anomaly with right-handed currents

Implications of unitarity and gauge invariance for simplified dark matter models

Top A FB at the Tevatron vs. charge asymmetry at the LHC in chiral U(1) flavor models with flavored Higgs doublets

Contact Info

Product

Resources

About