Results 91 to 100 of about 1,411 (170)

Anomaly free Froggatt-Nielsen models of flavor

Journal of High Energy Physics, 2019
We introduce two anomaly free versions of Froggatt-Nielsen (FN) models, based on either G FN = U(1)3 or G FN = U(1) horizontal symmetries, that generate the SM quark and lepton flavor structures.
Aleks Smolkovič, Michele Tammaro, Jure Zupan   +2 more
doaj   +1 more source

The automation of SMEFT-assisted constraints on UV-complete models

Journal of High Energy Physics
The ongoing Effective Field Theory (EFT) program at the LHC and elsewhere is motivated by streamlining the connection between experimental data and UV-complete scenarios of heavy new physics beyond the Standard Model (BSM). This connection is provided by
Jaco ter Hoeve, Giacomo Magni, Juan Rojo, Alejo N. Rossia, Eleni Vryonidou   +4 more
doaj   +1 more source

Interpreting the 750 GeV diphoton excess within topflavor seesaw model

Nuclear Physics B, 2016
We propose that the extension of the Standard Model by typical vector-like SU(2)L doublet fermions and non-singlet scalar field can account for the observed 750 GeV diphoton excess in experimentally allowed parameter space.
Junjie Cao, Liangliang Shang, Wei Su, Fei Wang, Yang Zhang   +4 more
doaj   +1 more source

Unveiling desert region in inert doublet model assisted by Peccei-Quinn symmetry

Journal of High Energy Physics
The Inert Higgs Doublet model (IDM), assisted by Peccei-Quinn (PQ) symmetry, offers a simple but natural framework of a dark sector that accommodates Weakly Interacting Massive Particle (WIMP) and axion as dark matter components.
Anupam Ghosh, Partha Konar
doaj   +1 more source

Anomalous U(1) extension of the Standard Model

Journal of High Energy Physics
We present a set of example models in which the Standard Model (SM) symmetry group is extended by a new abelian symmetry. This additional symmetry appears anomalous in the effective low-energy theory; however, the anomalies cancel out when massive chiral
Pascal Anastasopoulos, Ignatios Antoniadis, Karim Benakli, François Rondeau   +3 more
doaj   +1 more source

Phenomenology of Vector-like Fermions in Physics Beyond the Standard Model

, 2017
PhD thesis, based on arXiv:1408 ...
openaire   +2 more sources

Revisiting the minimal Nelson-Barr model

Journal of High Energy Physics
We revisit the minimal Nelson-Barr model for solving the strong CP problem through the idea of spontaneous CP breaking. The minimal model suffers from the quality problem, which means that the strong CP angle is generated by higher-dimensional operators ...
Kai Murai, Kazunori Nakayama
doaj   +1 more source

Colorful particle production at high-energy muon colliders

Journal of High Energy Physics
A high-energy μ + μ − collider provides a wide variety of mechanisms for the production of new heavy particles. While the reach for such particles via the direct annihilation of μ + μ − will approach the center-of-mass energy of the collider, the ...
Tao Han, Matthew Low, Tong Arthur Wu, Keping Xie   +3 more
doaj   +1 more source

Recent results on vector-like quarks and excited fermions at CMS

The most recent results on the searches for the vector-like quarks and excited fermions from the CMS Collaboration are presented. These results are based on the full Run 2 $\sqrt{s} = $13 TeV proton-proton collision data collected by the CMS Collaboration at the LHC from 2016 to 2018, which corresponds to an integrated luminosity of 138 fb$^{-1}$.
openaire   +2 more sources

Chiral enhancement in the vector-like fourth family: case of b → sγ

Journal of High Energy Physics
We demonstrate that a vector-like fourth family of quarks induces a genuine chiral enhancement in b → sγ, which is absent in the Standard Model (SM).
Junichiro Kawamura, Yuji Omura
doaj   +1 more source