Fingerprint of low-scale leptogenesis in the primordial gravitational-wave spectrum

S Blasi, V Brdar, K Schmitz - Physical Review Research, 2020 - APS
The dynamical generation of right-handed-neutrino (RHN) masses in the early Universe
naturally entails the formation of cosmic strings that give rise to an observable signal in …

Higgs boson decay into a lepton pair and a photon revisited

A Kachanovich, U Nierste, I Nišandžić - Physical Review D, 2020 - APS
We present new calculations of the differential decay rates for H→ ℓ+ ℓ-γ with ℓ= e or μ in the
Standard Model. The branching fractions and forward-backward asymmetries, defined in …

Higgs boson decay into a lepton pair and a photon: A roadmap to the discovery of and probes of new physics

A Kachanovich, U Nierste, I Nišandžić - Physical Review D, 2022 - APS
The decay H→ ℓ+ ℓ-γ, ℓ= e, μ receives contributions from H→ Z [→ ℓ+ ℓ-] γ and a
nonresonant contribution, both of which are loop induced. We describe how one can …

Probing Charm Yukawa through Associated Production at the Hadron Collider

N Dong, H Hou, Z Qian, B Wang, Q Xu - arXiv preprint arXiv:2407.19797, 2024 - arxiv.org
At present, the study of the charm-quark Yukawa coupling at the Large Hadron Collider
mainly restricts the coupling constant $ y_c $ through the Higgs decay channels. Such …

Bounds on CP-violating Higgs-gluon interactions: the case of vanishing light-quark Yukawa couplings

U Haisch, A Hala - Journal of High Energy Physics, 2019 - Springer
A bstract We investigate CP-violating interactions involving the Higgs boson and gluons
within an effective field theory approach, focusing on the specific class of new-physics …

Charm-quark Yukawa coupling in h→ cc¯ γ at LHC

T Han, B Nachman, X Wang - Physics Letters B, 2019 - Elsevier
It is extremely challenging to probe the charm-quark Yukawa coupling at hadron colliders
primarily due to the large Standard Model (SM) background (including h→ bb¯) and the lack …

Light-quarks Yukawa couplings and new physics in exclusive high- Higgs and Higgs boson + -jet events

J Cohen, S Bar-Shalom, G Eilam, A Soni - Physical Review D, 2018 - APS
We suggest that the exclusive Higgs+ light (or b)-jet production at the LHC, pp→ h+ j (jb), is
a rather sensitive probe of the light-quarks Yukawa couplings and of other forms of new …

Revisiting the Higgs Boson Decay into a Photon and a Neutrino Pair

A Kachanovich, I Nišandžić - arXiv preprint arXiv:2405.16239, 2024 - arxiv.org
We present new calculations of the leading-order one-loop amplitude and the decay rate for
$ H\to\bar {\nu}\nu\gamma $ within the standard model, employing reduction to a set of basic …

Probing flavored regimes of leptogenesis with gravitational waves from cosmic strings

M Chianese, S Datta, G Miele, N Saviano - arXiv preprint arXiv …, 2024 - arxiv.org
Cosmic strings radiate detectable gravitational waves in models featuring high-scale
symmetry breaking, eg, high-scale leptogenesis. In this Letter, for the first time, we show that …

Unraveling the couplings of a Drell-Yan produced with heavy-flavor tagging

WS Hou, M Kohda, T Modak - Physical Review D, 2018 - APS
Despite the current absence of new-physics signals at the LHC, a Z′ boson with m Z′∼
100 GeV could still emerge via Drell-Yan (DY) production, qq¯→ Z′→ μ+ μ-, in the next few …