The International Linear Collider Technical Design Report - Volume 4: Detectors

One of the most-studied signals for physics beyond the standard model in the production of gauge bosons in electron-positron collisions is due to the anomalous triple gauge boson couplings in the Zγ final state. In this work, we study the implications of this at the ILC with polarized beams for signals that go beyond traditional anomalous triple neutral gauge boson couplings. Here we report a dimension-8 CP-conserving ZγZ vertex that has not found mention in the literature. We carry out a systematic study of the anomalous couplings in general terms and arrive at a classification. We then obtain linear-order distributions with and without CP violation. Furthermore, we place the study in the context of general BSM interactions represented by e + e − Zγ contact interactions. We set up a correspondence between the triple gauge boson couplings and the four-point contact interactions. We also present sensitivities on these anomalous couplings, which will be achievable at the ILC with realistic polarization and luminosity.

Section: Jhep08(2014)124supporting

confidence: 53%

Section: Numerical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

New physics in e + e − → Zγ at the ILC with polarized beams: explorations beyond conventional anomalous triple gauge boson couplings

Ananthanarayan

Lahiri

Patra

et al. 2014

“…The detector designs developed for the ILC [35] or for CLIC [18] include a highly granular calorimetry, called imaging calorimetry, for particle-flow purposes. The 3D granularity allows hadron showers to be tracked individually, towards an optimally efficient neutral hadron identification, hence a better energy resolution for jets.…”

Section: Detectorsmentioning

confidence: 99%

First look at the physics case of TLEP

Biçer¹,

Yıldız²,

Yıldız³

et al. 2014

493

616

Abstract:The discovery by the ATLAS and CMS experiments of a new boson with mass around 125 GeV and with measured properties compatible with those of a Standard-Model Higgs boson, coupled with the absence of discoveries of phenomena beyond the Standard Model at the TeV scale, has triggered interest in ideas for future Higgs factories. A new circular e + e − collider hosted in a 80 to 100 km tunnel, TLEP, is among the most attractive solutions proposed so far. It has a clean experimental environment, produces high luminosity for top-quark, Higgs boson, W and Z studies, accommodates multiple detectors, and can reach energies up to the tt threshold and beyond. It will enable measurements of the Higgs boson properties and of Electroweak Symmetry-Breaking (EWSB) parameters with unequalled precision, offering exploration of physics beyond the Standard Model in the multi-TeV range. Moreover, being the natural precursor of the VHE-LHC, a 100 TeV hadron machine in the same tunnel, it builds up a long-term vision for particle physics. Altogether, the combination of TLEP and the VHE-LHC offers, for a great cost effectiveness, the best precision and the best search reach of all options presently on the market. This paper presents a first appraisal of the salient features of the TLEP physics potential, to serve as a baseline for a more extensive design study.

“…Thus ϕ T 2 , ϕ T 3 will be also important target at the High-Luminosity LHC, which could be tested with large amount of integrated luminosity although the production cross sections are small. Furthermore the flavon-lepton Yukawa interactions can be tested at the lepton colliders like ILC [50]- [54] where detailed analysis is left as future work.…”

Section: Jhep03(2016)192mentioning

confidence: 99%

Mass limit for light flavon with residual Z3 symmetry

Muramatsu

Nomura

Shimizu

2016

We present a modified Altarelli and Feruglio A 4 model where an additional A 4 singlet-prime flavon is introduced. In this model, non-zero θ 13 is given by this additional A 4 singlet-prime flavon which breaks tri-bimaximal mixing. In the framework of the supersymmetry with U(1) R symmetry, we obtain vacuum expectation values (VEVs) and VEV alignments of flavons through driving fields. It is considered that flavon induces distinctive flavor violating process if flavon mass is light. Assuming mass of SUSY particles are sufficiently heavy so that the SUSY contributions can be negligible, we discuss the flavor violating Yukawa interaction through flavon exchange in the charged lepton sector. According to the potential analysis, the VEV of flavon breaks A 4 down to Z 3 in the charged lepton sector and relation among flavon masses is determined. Thanks for the residual Z 3 symmetry, many lepton flavor violating decay modes are forbidden except for τ → µµē and τ → eeμ. A mass limit of the flavon from these three-body decay modes is 60 GeV taking into account the current experimental lower bounds at the Belle experiment. In our model, we predict a ratio of the branching ratios τ → µµē and τ → eeμ by using known charged lepton masses. We also find that the production cross section for the flavon can be O(1) fb. Thus the flavon would be found at the LHC run 2 by searching for 4-tau lepton signal.