Dynamical origin of the electroweak scale and the 125 GeV scalar
Di Chiara, S., Foadi, R., Tuominen, K., & Tähtinen, S. K. (2015). Dynamical origin of the electroweak scale and the 125 GeV scalar. Nuclear Physics B, 900, 295-330. https://doi.org/10.1016/j.nuclphysb.2015.09.013
Julkaistu sarjassaNuclear Physics B
© 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license. Funded by SCOAP3.
We consider a fully dynamical origin for the masses of weak gauge bosons and heavy quarks of the Standard Model. Electroweak symmetry breaking and the gauge boson masses arise from new strong dynamics, which leads to the appearance of a composite scalar in the spectrum of excitations. In order to generate mass for the Standard Model fermions, we consider extended gauge dynamics, effectively represented by four fermion interactions at presently accessible energies. By systematically treating these interactions, we show that they lead to a large reduction of the mass of the scalar resonance. Therefore, interpreting the scalar as the recently observed 125 GeV state implies that the mass originating solely from new strong dynamics can be much heavier, i.e. of the order of 1 TeV. In addition to reducing the mass of the scalar resonance, we show that the four-fermion interactions allow for contributions to the oblique corrections in agreement with the experimental constraints. The couplings of the scalar resonance with the Standard Model gauge bosons and fermions are evaluated, and found to be compatible with the current LHC results. Additional new resonances are expected to be heavy, with masses of the order of a few TeVs, and hence accessible in future experiments. ...
MetadataNäytä kaikki kuvailutiedot
Näytetään aineistoja, joilla on samankaltainen nimeke tai asiasanat.
Alanne, Tommi (University of Jyväskylä, 2015)In this thesis, we discuss ideas of how to go beyond the Standard Model (SM) of particle physics to incorporate the cosmological observations of dark matter and matter–antimatter asymmetry, and to address the theoretical ...
Vaskonen, Ville (2013)In this thesis we study the Higgs sector of the Standard Model and compare it to the latest data from the LHC and Tevatron experiments. Then we consider two extensions of the Higgs sector. First we extend the Standard Model ...
Alanne, Tommi; Kainulainen, Kimmo; Tuominen, Kimmo; Vaskonen, Ville (Institute of Physics Publishing Ltd.; Scuola Internazionale Superiore di Studi Avanzati (SISSA), 2016)We investigate an extension of the Standard Model containing two Higgs doublets and a singlet scalar field (2HDSM). We show that the model can have a strongly first-order phase transition and give rise to the observed ...
Deng, Guocheng; Malola, Sami; Yan, Juanzhu; Han, Ying-Zi; Yuan, Peng; Zhao, Chaowei; Yuan, Xiting; Lin, Shuichao; Tang, Zichao; Teo, Boon K.; Häkkinen, Hannu; Zheng, Nanfeng (Wiley-VCH, 2018)A general method, using mixed ligands (here diphosphines and thiolates) is devised to turn an achiral metal cluster, Au13Cu2, into an enantiomeric pair by breaking (lowering) the overall molecular symmetry with the ligands. ...
Determination of the θ23 octant in long baseline neutrino experiments within and beyond the standard model Das, C. R.; Pulido, João; Maalampi, Jukka; Vihonen, Sampsa (American Physical Society, 2018)The recent data indicate that the neutrino mixing angle θ 23 deviates from the maximal-mixing value of 45°, showing two nearly degenerate solutions, one in the lower octant (LO) ( θ 23 < 4 5 ° ) and one in the ...