Fiona Kirk
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View article: Atomic Observables Induced by Cosmic Fields
Atomic Observables Induced by Cosmic Fields Open
The existence of cosmic fields made from yet unknown light bosons is predicted in many extensions to the Standard Model. They are especially of interest as possible constituents of dark matter. To detect such light and weakly interacting f…
View article: Searching for Dark Matter with the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Th</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mn>229</mml:mn></mml:mmultiscripts></mml:mrow></mml:math> Nuclear Lineshape from Laser Spectroscopy
Searching for Dark Matter with the Nuclear Lineshape from Laser Spectroscopy Open
The recent laser excitation of the low-lying Th
View article: Probing New Bosons and Nuclear Structure with Ytterbium Isotope Shifts
Probing New Bosons and Nuclear Structure with Ytterbium Isotope Shifts Open
In this Letter, we present mass-ratio measurements on highly charged Yb42+ ions with a precision of 4×10−12 and isotope-shift measurements on Yb+ on the S
View article: Searching for dark matter with the Th-229 nuclear lineshape from laser spectroscopy
Searching for dark matter with the Th-229 nuclear lineshape from laser spectroscopy Open
The recent laser excitation of the low-lying Th-229 isomer transition is starting a revolution in ultralight dark matter searches. The enhanced sensitivity of this transition to the large class of dark matter models dominantly coupling to …
View article: Probing new bosons and nuclear structure with ytterbium isotope shifts
Probing new bosons and nuclear structure with ytterbium isotope shifts Open
In this Letter, we present mass-ratio measurements on highly charged Yb$^{42+}$ ions with a precision of $4\times 10^{-12}$ and isotope-shift measurements on Yb$^{+}$ on the $^{2}$S$_{1/2}$ $\to$ $^{2}$D$_{5/2}$ and $^{2}$S$_{1/2}$ $\to$ $…
View article: Charged Higgs-boson decays into quarks
Charged Higgs-boson decays into quarks Open
We consider the full genuine next-to-leading order SUSY–QCD corrections to the charged Higgs decays into quarks supplemented by the NNLO corrections to the effective top and bottom Yukawa couplings. The NNLO corrections to the effective to…
View article: Charged Higgs-Boson Decays into Quarks
Charged Higgs-Boson Decays into Quarks Open
We consider the full genuine next-to-leading order SUSY-QCD corrections to the charged Higgs decays into quarks supplemented by the NNLO corrections to the effective top and bottom Yukawa couplings. The NNLO corrections to the effective to…
View article: A viable $$L_e-L_\mu $$ model with $$\mu \rightarrow e$$ violation
A viable $$L_e-L_\mu $$ model with $$\mu \rightarrow e$$ violation Open
We extend the Standard Model gauge group by $$U(1)_{L_e-L_\mu }$$ and introduce two scalars, a doublet and a singlet, that are charged under this new group and have lepton flavour violating couplings. Since in this model $$…
View article: Comprehensive analysis of charged lepton flavour violation in the symmetry protected type-I seesaw
Comprehensive analysis of charged lepton flavour violation in the symmetry protected type-I seesaw Open
View article: Impact of Lorentz violation on anomalous magnetic moments of charged leptons
Impact of Lorentz violation on anomalous magnetic moments of charged leptons Open
View article: Impact of Lorentz violation on anomalous magnetic moments of charged leptons
Impact of Lorentz violation on anomalous magnetic moments of charged leptons Open
We address the question whether a violation of Lorentz symmetry can explain the tension between the measurement and the Standard-Model prediction of the anomalous magnetic moment of the muon ($(g-2)_μ$) and whether it can significantly imp…
View article: Comprehensive Analysis of Charged Lepton Flavour Violation in the Symmetry Protected Type-I Seesaw
Comprehensive Analysis of Charged Lepton Flavour Violation in the Symmetry Protected Type-I Seesaw Open
The type-I seesaw model is probably the most straightforward and best studied extension of the Standard Model that can account for the tiny active neutrino masses determined from neutrino oscillation data. In this article, we calculate the…
View article: A viable $L_e-L_μ$ model with $μ\to e$ violation
A viable $L_e-L_μ$ model with $μ\to e$ violation Open
We extend the Standard Model gauge group by $U(1)_{L_e-L_μ}$ and introduce two scalars, a doublet and a singlet, that are charged under this new group and have lepton flavour violating couplings. Since in this model $μ\to e$ processes can …
View article: A viable $L_e-L_\\mu$ model with $\\mu\\to e$ violation
A viable $L_e-L_\\mu$ model with $\\mu\\to e$ violation Open
We extend the Standard Model gauge group by $U(1)_{L_e-L_\\mu}$ and introduce\ntwo scalars, a doublet and a singlet, that are charged under this new group and\nhave lepton flavour violating couplings. Since in this model $\\mu \\to e$\npro…
View article: Leptophilic New Physics and the Cabibbo Angle Anomaly
Leptophilic New Physics and the Cabibbo Angle Anomaly Open
The Cabibbo Angle Anomaly, an apparent deficit in first-row CKM unitarity, can be addressed by leptophilic Standard Model extensions that generate new contributions to the Fermi constant and affect the determination of the CKM element $V_{…
View article: Explaining the Cabibbo Angle Anomaly and Lepton Flavour Universality Violation in Tau Decays With a Singly-Charged Scalar Singlet
Explaining the Cabibbo Angle Anomaly and Lepton Flavour Universality Violation in Tau Decays With a Singly-Charged Scalar Singlet Open
The singly charged $SU(2)_L$ singlet scalar, with its necessarily flavour violating couplings to leptons, lends itself particularly well for an explanation of the Cabibbo Angle Anomaly and of hints for lepton flavour universality violation…
View article: Searching for lepton flavor universality violation and collider signals from a singly charged scalar singlet
Searching for lepton flavor universality violation and collider signals from a singly charged scalar singlet Open
In recent years, evidence for lepton flavor universality violation beyond the Standard Model has been accumulated. In this context, a singly charged SU(2)L singlet scalar (ϕ±) is very interesting, as it can only have flavor off-diagonal co…
View article: Explaining the Cabibbo Angle Anomaly and Lepton Flavour Universality Violation in Tau Decays with a Singly-Charged Scalar Singlet
Explaining the Cabibbo Angle Anomaly and Lepton Flavour Universality Violation in Tau Decays with a Singly-Charged Scalar Singlet Open
The singly charged SU(2) L singlet scalar, with its necessarily flavour violating couplings to leptons, lends itself particularly well for an explanation of the Cabibbo Angle Anomaly and of hints for lepton flavour universality violation i…
View article: Global electroweak fit and vector-like leptons in light of the Cabibbo angle anomaly
Global electroweak fit and vector-like leptons in light of the Cabibbo angle anomaly Open
View article: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>Z</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math> models with less-minimal flavor violation
models with less-minimal flavor violation Open
We study the phenomenology of simplified $Z^\\prime$ models with a global\n$U(2)^3$ flavour symmetry in the quark sector, broken solely by the Standard\nModel Yukawa couplings. This flavour symmetry, known as less-minimal flavour\nviolatio…
View article: Z′ models with less-minimal flavour violation
Z′ models with less-minimal flavour violation Open
We study the phenomenology of simplified $Z′$ models with a global $U(2)^{3}$ flavour symmetry in the quark sector, broken solely by the Standard Model Yukawa couplings. This flavour symmetry, known as less-minimal flavour violation, prote…