R. Knegjens

activity

20102025

B_{s}^{0} \to μ^{+} μ^{-}

Effective Lifetime

289 citations · 1.9k across the 22 of their papers we have counts for

collaborators

22 papers

quant-ph2025

Comparison of schemes for highly loss tolerant photonic fusion based quantum computing

Sara Bartolucci, Tom Bell, Hector Bombin +18

We summarize the performance of recently-proposed methods for achieving fault tolerant fusions-based quantum computation with high tolerance to qubit loss, specifically aimed at ph…

quant-ph2020★ 264 cited

NetSquid, a NETwork Simulator for QUantum Information using Discrete events

Tim Coopmans, Robert Knegjens, Axel Dahlberg +13

In order to bring quantum networks into the real world, we would like to determine the requirements of quantum network protocols including the underlying quantum hardware. Because…

quant-ph2019★ 275 cited

A Link Layer Protocol for Quantum Networks

Axel Dahlberg, Matthew Skrzypczyk, Tim Coopmans +9

Quantum communication brings radically new capabilities that are provably impossible to attain in any classical network. Here, we take the first step from a physics experiment to a…

hep-ph2015★ 106 cited

$K \to π ν ν ˉ$ and $ε^{'} / ε$ in Simplified New Physics Models

Andrzej J. Buras, Dario Buttazzo, Robert Knegjens

The decays $K^{+} \to π^{+} ν ν ˉ$ and $K_{L} \to π^{0} ν ν ˉ$ , being the theoretically cleanest rare decays of mesons, are very sensitive probes of New Physics. In view of the excellent prosp…

hep-ph2015★ 3 cited

$K \to π ν ν ˉ$ in the Standard Model and Beyond

Robert Knegjens

The precision expected for the rare $K \to π ν ν ˉ$ decays by the NA62 and KOTO experiments in the coming decade will rival their current SM predictions. In preparation for this upc…

hep-ph2015★ 270 cited

$K^{+} \to π^{+} ν ν ˉ$ and $K_{L} \to π^{0} ν ν ˉ$ in the Standard Model: Status and Perspectives

Andrzej J. Buras, Dario Buttazzo, Jennifer Girrbach-Noe +1

In view of the recent start of the NA62 experiment at CERN that is expected to measure the $K^{+} \to π^{+} ν ν ˉ$ branching ratio with a precision of 10%, we summarise the present statu…

hep-ph2014★ 1 cited

Addressing Hadronic Uncertainties in Extractions of $ϕ_{s}$

Robert Knegjens

In light of recent LHC results for the extraction of the $B_{s}$ mixing phase $ϕ_{s}$ , we can already conclude that if New Physics (NP) is present in this observable, it is hiding pret…

hep-ph2014★ 38 cited

Can we reach the Zeptouniverse with rare K and B_{s,d} decays?

Andrzej J. Buras, Dario Buttazzo, Jennifer Girrbach-Noe +1

The Large Hadron Collider will directly probe distance scales as short as 10^{-19}m, corresponding to energy scales at the level of a few TeV. In order to reach even higher resolut…

hep-ph2014

Theory overview of $B_{s, d} \to μ^{+} μ^{-}$ decays

Robert Knegjens

In this talk I give a theoretical overview of the rare decays $B_{s} \to μ^{+} μ^{-}$ and $B_{d} \to μ^{+} μ^{-}$ . The branching ratios of these decays are promising probes of New Physics,…

hep-ph2013★ 1 cited

Phenomenology with a non-zero B_s decay width difference

Robert Knegjens

The experimentally established non-zero decay width difference of the B_s meson system gives us access to a mass eigenstate rate asymmetry for each B_s transition. This observable…

hep-ph2013★ 101 cited

Probing New Physics with the B_s to μ+ μ- Time-Dependent Rate

Andrzej J. Buras, Robert Fleischer, Jennifer Girrbach +1

The B_s to mu+ mu- decay plays an outstanding role in tests of the Standard Model and physics beyond it. The LHCb collaboration has recently reported the first evidence for this de…

hep-ph2013★ 31 cited

The Anatomy of Neutral Scalars with FCNCs in the Flavour Precision Era

Andrzej J. Buras, Fulvia De Fazio, Jennifer Girrbach +2

In many extensions of the Standard Model flavour changing neutral current processes can be mediated by tree-level heavy neutral scalars and/or pseudo-scalars H^0(A^0). This general…

hep-ph2012★ 3 cited

An exploration of $B_{s} \to J / ψ s s ˉ$

Robert Knegjens

Measurements of the $B_{s}^{0}$ -- $B ˉ_{s}^{0}$ mixing phase $ϕ_{s}$ appear to be converging towards the SM prediction, suggesting that contributions from New Physics (NP), if present, ar…

hep-ph2012★ 44 cited

Exploring $B_{s} \to D_{s}^{(*) \pm} K^{\mp}$ Decays in the Presence of a Sizable Width Difference $Δ Γ_{s}$

Kristof De Bruyn, Robert Fleischer, Robert Knegjens +3

The $B_{s} \to D_{s}^{(*) \pm} K^{\mp}$ decays allow a theoretically clean determination of $ϕ_{s} + γ$ , where $ϕ_{s}$ is the $B_{s}^{0}$ - $B ˉ_{s}^{0}$ mixing phase and $γ$ the usual angle of the un…

hep-ph2012★ 289 cited

Probing New Physics via the $B_{s}^{0} \to μ^{+} μ^{-}$ Effective Lifetime

Kristof De Bruyn, Robert Fleischer, Robert Knegjens +4

We have recently seen new upper bounds for $B_{s}^{0} \to μ^{+} μ^{-}$ , a key decay to search for physics beyond the Standard Model. Furthermore a non-vanishing decay width difference $Δ Γ_{s}$ …

hep-ph2012★ 222 cited

Branching Ratio Measurements of $B_{s}$ Decays

Kristof De Bruyn, Robert Fleischer, Robert Knegjens +3

We have just entered an era of precision measurements for $B_{s}$ -decay observables. A characteristic feature of the $B_{s}$ -meson system is $B_{s}^{0}$ -- $B ˉ_{s}^{0}$ mixing, which exhibit…

hep-ph2011★ 43 cited

Exploring CP Violation and $η$ - $η^{'}$ Mixing with the $B_{s, d}^{0} \to J / ψ η^{(')}$ Systems

Robert Fleischer, Robert Knegjens, Giulia Ricciardi

The $B_{s, d}^{0} \to J / ψ η^{(')}$ decays provide new terrain for exploring CP violation. After briefly discussing $η$ - $η^{'}$ mixing, we analyse the effective lifetimes and CP-viola…

hep-ph2011★ 69 cited

Effective Lifetimes of $B_{s}$ Decays and their Constraints on the $B_{s}^{0}$ - $B ˉ_{s}^{0}$ Mixing Parameters

Robert Fleischer, Robert Knegjens

Measurements of the effective lifetimes of $B_{s}$ -meson decays, which only require untagged rate analyses, allow us to probe the width difference $Δ Γ_{s}$ and the CP-violating phase $…

hep-ph2011★ 69 cited

Anatomy of $B_{s, d}^{0} \to J / ψ f_{0} (980)$

Robert Fleischer, Robert Knegjens, Giulia Ricciardi

The $B_{s}^{0} \to J / ψ f_{0} (980)$ decay offers an interesting experimental alternative to the well-known $B_{s}^{0} \to J / ψ ϕ$ channel for the search of CP-violating New-Physics contributions t…

hep-ph2010★ 2 cited

A Fresh Look at B_{s,d} -> pi pi, pi K, K K Decays

Robert Fleischer, Robert Knegjens

Using updated measurements and SU(3)-breaking form factors, we have a detailed look at the B_d -> pi^+ pi^-, B_s -> K^+ K^- and B_d -> pi^\mp K^\pm, B_s -> pi^\pm K^\mp systems. Th…

hep-ph2010★ 53 cited

In Pursuit of New Physics with B^0_s -> K^+K^-

Robert Fleischer, Robert Knegjens

The B^0_s -> K^+K^- decay is the U-spin partner of B^0_d -> pi^+π^- and allows a determination of the angle gamma of the unitarity triangle of the Cabibbo-Kobayashi-Maskawa matrix.…

hep-ph2010★ 6 cited

Single top production in a non-minimal supersymmetric model

Michel Herquet, Robert Knegjens, Eric Laenen

We study single top production at the LHC in a SUSY-QCD model with a heavy Dirac gluino. The presence of a heavy Dirac gluino allows for notable top-up flavour changing neutral cur…

Comparison of schemes for highly loss tolerant photonic fusion based quantum computing

NetSquid, a NETwork Simulator for QUantum Information using Discrete events

A Link Layer Protocol for Quantum Networks

K→πννˉ and ε′/ε in Simplified New Physics Models

K→πννˉ in the Standard Model and Beyond

K+→π+ννˉ and KL​→π0ννˉ in the Standard Model: Status and Perspectives

Addressing Hadronic Uncertainties in Extractions of ϕs​

Can we reach the Zeptouniverse with rare K and B_{s,d} decays?

Theory overview of Bs,d​→μ+μ− decays

Phenomenology with a non-zero B_s decay width difference

Probing New Physics with the B_s to μ+ μ- Time-Dependent Rate

The Anatomy of Neutral Scalars with FCNCs in the Flavour Precision Era

An exploration of Bs​→J/ψssˉ

Exploring Bs​→Ds(∗)±​K∓ Decays in the Presence of a Sizable Width Difference ΔΓs​

Probing New Physics via the Bs0​→μ+μ− Effective Lifetime

Branching Ratio Measurements of Bs​ Decays

Exploring CP Violation and η-η′ Mixing with the Bs,d0​→J/ψη(′) Systems

Effective Lifetimes of Bs​ Decays and their Constraints on the Bs0​-Bˉs0​ Mixing Parameters

Anatomy of Bs,d0​→J/ψf0​(980)

A Fresh Look at B_{s,d} -> pi pi, pi K, K K Decays

In Pursuit of New Physics with B^0_s -> K^+K^-

Single top production in a non-minimal supersymmetric model

$K \to π ν ν ˉ$ and $ε^{'} / ε$ in Simplified New Physics Models

$K \to π ν ν ˉ$ in the Standard Model and Beyond

$K^{+} \to π^{+} ν ν ˉ$ and $K_{L} \to π^{0} ν ν ˉ$ in the Standard Model: Status and Perspectives

Addressing Hadronic Uncertainties in Extractions of $ϕ_{s}$

Theory overview of $B_{s, d} \to μ^{+} μ^{-}$ decays

An exploration of $B_{s} \to J / ψ s s ˉ$

Exploring $B_{s} \to D_{s}^{(*) \pm} K^{\mp}$ Decays in the Presence of a Sizable Width Difference $Δ Γ_{s}$

Probing New Physics via the $B_{s}^{0} \to μ^{+} μ^{-}$ Effective Lifetime

Branching Ratio Measurements of $B_{s}$ Decays

Exploring CP Violation and $η$ - $η^{'}$ Mixing with the $B_{s, d}^{0} \to J / ψ η^{(')}$ Systems

Effective Lifetimes of $B_{s}$ Decays and their Constraints on the $B_{s}^{0}$ - $B ˉ_{s}^{0}$ Mixing Parameters

Anatomy of $B_{s, d}^{0} \to J / ψ f_{0} (980)$