U. Nierste

activity

19932026

most citedThe Belle II Physics Book

570 citations · 6.9k across the 118 of their papers we have counts for

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119 papers · 1 filter

hep-ph2026

Next-to-next-to-leading QCD corrections to the $B^{+}$ - $B_{d}^{0}$ , $D^{+}$ - $D^{0}$ , and $D_{s}^{+}$ - $D^{0}$ lifetime ratios

Francesco Moretti, Ulrich Nierste, Pascal Reeck +1

The total decay widths of heavy mesons can be systematically calculated in terms of an expansion in the two parameters $1/ m_{Q}$ and $α_{s} (m_{Q})$ , where $Q = c, b$ denotes the heavy quark…

hep-ph2025

Complete next-to-next-to-leading order QCD corrections to the decay matrix in $B$ -meson mixing at leading power

Ulrich Nierste, Pascal Reeck, Vladyslav Shtabovenko +1

We compute next-to-next-to-leading order corrections to the decay width difference of mass eigenstates and the charge-parity (CP) asymmetry $a_{fs}$ in flavour-specific decays…

hep-ph2025

QCD corrections to charged-current decays with Heavy Sterile Neutrinos in initial or final state and their impact on $τ$ decays

Tim Kretz, Ulrich Nierste

Searches for a Heavy Sterile Neutrino $N$ profit from precise predictions of inclusive decay rates, entering predictions for branching fractions and lifetime. Once decay channels i…

hep-ph2025

CP Violation in Charmed Meson Decays into Final States with $η^{'}$

Carolina Bolognani, Ulrich Nierste, Stefan Schacht +1

We derive Standard Model predictions for the CP asymmetries of singly-Cabibbo suppressed $D \to P η^{'}$ decays, where $P = K, π, η$ . Our predictions are based on the approximate SU…

hep-ph2025

Decay matrix of B-\bar{B} mixing: Mixing of dimension-seven operators into dimension-six operators under renormalization

Artyom Hovhannisyan, Ulrich Nierste

The precise measurement of the width difference ΔΓ_s among the mass eigenstates of the B_s-\bar{B}_s system requires the calculation of the corresponding decay matrix to order α_s/…

hep-ph2025★ 1 cited

TeV-scale scalar leptoquarks motivated by B anomalies improve Yukawa unification in SO(10) GUT

Xiyuan Gao, Ulrich Nierste

It is common practice to explain deviations between data and Standard-Model (SM) predictions by postulating new particles at the TeV scale ad-hoc. This approach becomes much more c…

hep-ph2025★ 3 cited

$B \to K + axion-like particles$ : effective versus UV-complete models and enhanced two-loop contributions

Xiyuan Gao, Ulrich Nierste

An axion-like particle $a$ (ALP) can explain the excess of $B \to K + invisible$ events at Belle-II. However, many analyses of ALP scenarios are over-simplified. We r…

hep-ph2025

Current-current operator contribution to the decay matrix in $B$ -meson mixing at next-to-next-to-leading order of QCD

Marvin Gerlach, Ulrich Nierste, Pascal Reeck +2

We compute next-to-next-to-leading order perturbative corrections to the decay width difference of mass eigenstates and the charge-parity asymmetry $a_{fs}$ in flavour-specific…

hep-ph2025

Branching fractions and CP asymmetries in charm meson decays

Ulrich Nierste

I present a consistent way to include $η$ - $η^{'}$ mixing in global analyses of two-body decays of heavy hadrons employing the approximate flavour-SU(3) symmetry of QCD. The fram…

hep-ph2025

Kaon Physics: A Cornerstone for Future Discoveries

Jason Aebischer, Atakan Tugberk Akmete, Riccardo Aliberti +153

The kaon physics programme, long heralded as a cutting-edge frontier by the European Strategy for Particle Physics, continues to stand at the intersection of discovery and innovati…

hep-ph2024

Model independent bounds on heavy sterile neutrinos from the angular distribution of $B \to D^{*} ℓ ν$ decays

Florian U. Bernlochner, Marco Fedele, Tim Kretz +2

In this paper we study the bounds that can be inferred on New Physics couplings to heavy sterile neutrinos $N$ from the recent measurements performed by the Belle collaboration of…

hep-ph2024

Anatomy of Non-Leptonic Two-Body Decays of Charmed Mesons into Final States with $η^{'}$

Carolina Bolognani, Ulrich Nierste, Stefan Schacht +1

We show that $D \to P η^{'}$ decay amplitudes, where $P = K, π, η$ , cannot be simply related to their $D \to P η$ counterparts with a single $η_{0}$ -- $η_{8}$ mixing angle. W…

hep-ph2024

Radiative corrections relating leptoquark-fermion couplings probed at low and high energy

Innes Bigaran, Rodolfo Capdevilla, Ulrich Nierste

Scalar leptoquarks (LQ) with masses between 2 TeV and 50 TeV are prime candidates to explain deviations between measurements and Standard-Model predictions in decay observables of…

hep-ph2024

$SU (3)_{F}$ sum rules for CP asymmetry of $D_{(s)}$ decays

Syuhei Iguro, Ulrich Nierste, Emil Overduin +1

Charge-parity (CP) asymmetries in charm decays are extremely suppressed in the Standard Model and may well be dominated by new physics contributions. The LHCb collaboration reporte…

hep-ph2024

NNLO QCD corrections to $Δ Γ_{s}$ in the $B_{s} - B_{s}$ system

Marvin Gerlach, Ulrich Nierste, Pascal Reeck +2

This report summarises recent advances made in the calculation of the NNLO QCD corrections to the width difference $Δ Γ_{s}$ in the $B_{s} - B_{s}$ system. The inclusion of the e…

hep-ph2023★ 1 cited

Renormalisation group analysis of scalar Leptoquark couplings addressing flavour anomalies: emergence of lepton-flavour universality

Marco Fedele, Felix Wuest, Ulrich Nierste

Leptoquarks with masses between 2 TeV and 50 TeV are commonly invoked to explain deviations between data and Standard-Model (SM) predictions of several observables in the decays $b…

hep-ph2023★ 24 cited

Discriminating $B \to D^{*} ℓ ν$ form factors via polarization observables and asymmetries

Marco Fedele, Monika Blanke, Andreas Crivellin +4

Form factors are crucial theory input in order to extract $∣ V_{c b} ∣$ from $B \to D^{(*)} ℓ ν$ decays, to calculate the Standard Model prediction for $R (D^{(*)})$ and to ass…

hep-ph2022★ 5 cited

$B_{s} \to μ^{+} μ^{-}$ in a Two-Higgs-Doublet Model with flavour-changing up-type Yukawa couplings

Martin S. Lang, Ulrich Nierste

We present a Two-Higgs-Doublet Model in which the structure of the quark Yukawa matrices is governed by three spurions breaking the flavour symmetries of the quark Yukawa sector. T…

hep-ph2022★ 44 cited

Impact of $Λ_{b} \to Λ_{c} τ ν$ measurement on New Physics in $b \to c l ν$ transitions

Marco Fedele, Monika Blanke, Andreas Crivellin +4

Measurements of the branching ratios of $B \to D^{(*)} τ ν ˉ / B \to D^{(*)} ℓ ν ˉ$ and $B_{c} \to J / ψ τ ν ˉ / B_{c} \to J / ψ ℓ ν ˉ$ by the BaBar, Belle and LHCb collaborations co…

hep-ph2022★ 17 cited

The width difference in the $B - B ˉ$ system at next-to-next-to-leading order of QCD

Marvin Gerlach, Ulrich Nierste, Vladyslav Shtabovenko +1

We extend the theoretical prediction for the width difference $Δ Γ_{q}$ in the mixing of neutral $B$ mesons in the Standard Model to next-to-next-to-leading order in $α_{s}$ . To this ai…

hep-ph2022★ 5 cited

Addendum: Towards next-to-next-to-leading-log accuracy for the width difference in the $B_{s} - B ˉ_{s}$ system: fermionic contributions to order $(m_{c} / m_{b})^{0}$ and $(m_{c} / m_{b})^{1}$

Artyom Hovhannisyan, Ulrich Nierste

We calculate the three-loop master integrals of Ref. [1] [arXiv:1709.02160] in analytic form. This allows us to present the fermionic contributions to the $Δ B = 2$ Wilson coefficient…

hep-ph2022

The width difference in \bbm\ at order $α_{s}$ and beyond

Marvin Gerlach, Ulrich Nierste, Vladyslav Shtabovenko +1

We complete the calculation of the element $Γ_{12}^{q}$ of the decay matrix in $B_{q} - B ˉ_{q}$ mixing, $q = d, s$ , to order $α_{s}$ in the leading power of the Heavy Quark Expansion. To t…

hep-ph2021★ 13 cited

Higgs decay into a lepton pair and a photon: a roadmap to $H \to Z γ$ discovery and probes of new physics

Aliaksei Kachanovich, Ulrich Nierste, Ivan Nišandžić

The decay $H \to ℓ^{+} ℓ^{-} γ$ , $ℓ = e, μ$ , receives contributions from $H \to Z [\to ℓ^{+} ℓ^{-}] γ$ and a non-resonant contribution, both of which are loop-induced. We describe h…

hep-ph2021★ 16 cited

Two-loop QCD penguin contribution to the width difference in $B_{s} - B ˉ_{s}$ mixing

Marvin Gerlach, Ulrich Nierste, Vladyslav Shtabovenko +1

We consider two-loop QCD corrections to the element $Γ_{12}^{q}$ of the decay matrix in $B_{q} - B ˉ_{q}$ mixing, $q = d, s$ , in the leading power of the Heavy Quark Expansion. The calcul…

Next-to-next-to-leading QCD corrections to the B+-Bd0​, D+-D0, and Ds+​-D0 lifetime ratios

Complete next-to-next-to-leading order QCD corrections to the decay matrix in B-meson mixing at leading power

QCD corrections to charged-current decays with Heavy Sterile Neutrinos in initial or final state and their impact on τ decays

CP Violation in Charmed Meson Decays into Final States with η′

Decay matrix of B-\bar{B} mixing: Mixing of dimension-seven operators into dimension-six operators under renormalization

TeV-scale scalar leptoquarks motivated by B anomalies improve Yukawa unification in SO(10) GUT

B→K+axion-like particles: effective versus UV-complete models and enhanced two-loop contributions

Current-current operator contribution to the decay matrix in B-meson mixing at next-to-next-to-leading order of QCD

Branching fractions and CP asymmetries in charm meson decays

Kaon Physics: A Cornerstone for Future Discoveries

Model independent bounds on heavy sterile neutrinos from the angular distribution of B→D∗ℓν decays

Anatomy of Non-Leptonic Two-Body Decays of Charmed Mesons into Final States with η′

Radiative corrections relating leptoquark-fermion couplings probed at low and high energy

SU(3)F​ sum rules for CP asymmetry of D(s)​ decays

NNLO QCD corrections to ΔΓs​ in the Bs​−Bs​ system

Renormalisation group analysis of scalar Leptoquark couplings addressing flavour anomalies: emergence of lepton-flavour universality

Discriminating B→D∗ℓν form factors via polarization observables and asymmetries

Bs​→μ+μ− in a Two-Higgs-Doublet Model with flavour-changing up-type Yukawa couplings

Impact of Λb​→Λc​τν measurement on New Physics in b→clν transitions

The width difference in the B−Bˉ system at next-to-next-to-leading order of QCD

Addendum: Towards next-to-next-to-leading-log accuracy for the width difference in the Bs​−Bˉs​ system: fermionic contributions to order (mc​/mb​)0 and (mc​/mb​)1

The width difference in \bbm\ at order αs​ and beyond

Higgs decay into a lepton pair and a photon: a roadmap to H→Zγ discovery and probes of new physics

Two-loop QCD penguin contribution to the width difference in Bs​−Bˉs​ mixing

Next-to-next-to-leading QCD corrections to the $B^{+}$ - $B_{d}^{0}$ , $D^{+}$ - $D^{0}$ , and $D_{s}^{+}$ - $D^{0}$ lifetime ratios

Complete next-to-next-to-leading order QCD corrections to the decay matrix in $B$ -meson mixing at leading power

QCD corrections to charged-current decays with Heavy Sterile Neutrinos in initial or final state and their impact on $τ$ decays

CP Violation in Charmed Meson Decays into Final States with $η^{'}$

$B \to K + axion-like particles$ : effective versus UV-complete models and enhanced two-loop contributions

Current-current operator contribution to the decay matrix in $B$ -meson mixing at next-to-next-to-leading order of QCD

Model independent bounds on heavy sterile neutrinos from the angular distribution of $B \to D^{*} ℓ ν$ decays

Anatomy of Non-Leptonic Two-Body Decays of Charmed Mesons into Final States with $η^{'}$

$SU (3)_{F}$ sum rules for CP asymmetry of $D_{(s)}$ decays

NNLO QCD corrections to $Δ Γ_{s}$ in the $B_{s} - B_{s}$ system

Discriminating $B \to D^{*} ℓ ν$ form factors via polarization observables and asymmetries

$B_{s} \to μ^{+} μ^{-}$ in a Two-Higgs-Doublet Model with flavour-changing up-type Yukawa couplings

Impact of $Λ_{b} \to Λ_{c} τ ν$ measurement on New Physics in $b \to c l ν$ transitions

The width difference in the $B - B ˉ$ system at next-to-next-to-leading order of QCD

Addendum: Towards next-to-next-to-leading-log accuracy for the width difference in the $B_{s} - B ˉ_{s}$ system: fermionic contributions to order $(m_{c} / m_{b})^{0}$ and $(m_{c} / m_{b})^{1}$

The width difference in \bbm\ at order $α_{s}$ and beyond

Higgs decay into a lepton pair and a photon: a roadmap to $H \to Z γ$ discovery and probes of new physics

Two-loop QCD penguin contribution to the width difference in $B_{s} - B ˉ_{s}$ mixing