S. Ghinescu

activity

20162026

K^{+} \to π^{+} ν ν ˉ

decay

155 citations · 598 across the 30 of their papers we have counts for

collaborators

30 papers

nucl-th2026

Direct Calculation of the Two-Neutrino Double-Beta Decay Rate Including the Full Lepton-Energy Dependence

S. A. Ghinescu, Stefan-Alexandru Ghinescu, Andrei Neacsu +3

The calculation of the two-neutrino double-beta decay (DBD) rates has so far relied on approximations that decouple the nuclear structure from the emitted lepton kinematics. To ens…

nucl-th2026

Updated Results for Kinematic Factors in Double Beta Decays

S. Ghinescu, S. Stoica

Accurate calculations of phase space factors (PSFs), electron energy spectra and angular correlations are essential for designing and interpreting double-beta decay (DBD) experimen…

hep-ex2025

Searches for hidden sectors using $K^{+} \to π^{+} X$ decays

NA62 Collaboration

Results from the study of the rare decays $K^{+} \to π^{+} ν ν ˉ$ , $K^{+} \to π^{+} μ^{+} μ^{-}$ and $K^{+} \to π^{+} γ γ$ at the NA62 experiment at CERN are interpreted in terms…

nucl-ex2025★ 1 cited

High-precision direct decay energy measurements of the electron-capture decay of $^{97}$ Tc

Zhuang Ge, Tommi Eronen, Vasile Alin Sevestrean +27

A direct measurement of the ground-state-to-ground-state electron-capture decay $Q$ ( $Q_{EC}$ ) value of $^{97}$ Tc has been conducted employing the high resolving power phase-im…

hep-ex2025★ 5 cited

Search for hadronic decays of feebly-interacting particles at NA62

NA62 Collaboration

The NA62 experiment at CERN has the capability to collect data in a beam-dump mode, where 400 GeV protons are dumped on an absorber. In this configuration, New Physics particles, i…

hep-ex2024★ 13 cited

Observation of the $K^{+} \to π^{+} ν ν ˉ$ decay and measurement of its branching ratio

NA62 Collaboration

A measurement of the $K^{+} \to π^{+} ν ν ˉ$ decay by the NA62 experiment at the CERN SPS is presented, using data collected in 2021 and 2022. This dataset was recorded, afte…

hep-ex2024★ 3 cited

First detection of a tagged neutrino in the NA62 experiment

NA62 Collaboration

The NA62 experiment at the CERN SPS reports the first detection of a tagged neutrino candidate based on the data collected in 2022. The candidate consists of a $K^+ \rightarrow μ^+…

nucl-th2024★ 8 cited

Theoretical analysis and predictions for the double electron capture of $^{124}$ Xe

Ovidiu Niţescu, Stefan Ghinescu, Vasile-Alin Sevestrean +3

We provide a complete theoretical description of the two-neutrino electron capture in $^{124}$ Xe, improving both the nuclear and the atomic structure calculations. We improve the g…

hep-ex2023

Development of a new CEDAR for kaon identification at the NA62 experiment at CERN

The NA62 Collaboration

The NA62 experiment at CERN utilises a differential Cherenkov counter with achromatic ring focus (CEDAR) for tagging kaons within an unseparated monochromatic beam of charged hadro…

hep-ex2023★ 10 cited

Search for Leptonic Decays of Dark Photons at NA62

The NA62 collaboration

The NA62 experiment at CERN, configured in beam-dump mode, has searched for dark photon decays in flight to electron-positron pairs using a sample of $1.4 \times 1 0^{17}$ protons on…

nucl-th2023★ 11 cited

Self-consistent calculations for atomic electron capture

V. A. Sevestrean, O. Niţescu, S. Ghinescu +1

We present a comprehensive investigation of electron capture (EC) ratios spanning a broad range of atomic numbers. The study employs a self-consistent computational method that inc…

hep-ex2023★ 5 cited

A study of the $K^{+} \to π^{0} e^{+} ν γ$ decay

The NA62 Collaboration

A sample of $1.3 \times 1 0^{5}$ $K^{+} \to π^{0} e^{+} ν γ$ candidates with less than 1% background was collected by the NA62 experiment at the CERN SPS in 2017-2018. Branching fraction mea…

physics.acc-ph2022

The ECFA Early Career Researcher's Panel: composition, structure, and activities, 2021 -- 2022

ECFA Early-Career Researcher Panel, :, Andrei Alexandru Geanta +74

The European Committee for Future Accelerators (ECFA) Early Career Researcher's (ECR) panel, which represents the interests of the ECR community to ECFA, officially began its activ…

hep-ex2022★ 15 cited

A measurement of the $K^{+} \to π^{+} μ^{+} μ^{-}$ decay

NA62 Collaboration

A sample of $2.8 \times 1 0^{4}$ $K^{+} \to π^{+} μ^{+} μ^{-}$ candidates with negligible background was collected by the NA62 experiment at the CERN SPS in 2017--2018. The model-inde…

hep-ex2022★ 3 cited

Performance of the NA62 trigger system

The NA62 Collaboration

The NA62 experiment at CERN targets the measurement of the ultra-rare $K^{+} \to π^{+} ν ν ˉ$ decay, and carries out a broad physics programme that includes probes for symmetry vio…

nucl-th2022★ 2 cited

Semi-microscopic theory of two proton emission

S. A. Ghinescu, D. S. Delion

We propose a semi-microscopic model for the simultaneous emission of two protons. This model has the advantage of avoiding certain technical aspects of a fully microscopic 3-body f…

nucl-th2022★ 8 cited

Investigation of the Lorentz invariance violation in two-neutrino double-beta decay

S. A. Ghinescu, O. Nitescu, S. Stoica

We make a comprehensive investigation of the Lorentz invariance violation (LIV) effects that may occur in two-neutrino double-beta ( $2 ν β β$ ) decay for all the experimentally interes…

hep-ex2022★ 19 cited

Searches for lepton number violating $K^{+} \to π^{-} (π^{0}) e^{+} e^{+}$ decays

NA62 collaboration

Searches for lepton number violating $K^{+} \to π^{-} e^{+} e^{+}$ and $K^{+} \to π^{-} π^{0} e^{+} e^{+}$ decays have been performed using the complete dataset collected by the NA62 experiment at CERN in 20…

hep-ex2021★ 5 cited

A biased MC for muon production for beam-dump experiments

Stefan Ghinescu, Babette Döbrich, Elisa Minucci +1

The search for feebly-interacting new-physics particles in the MeV-GeV mass range often involves high-intensity beams dumped into thick heavy targets. The challenge of evaluating t…

physics.ins-det2021★ 1 cited

Results of the 2021 ECFA Early-Career Researcher Survey on Training in Instrumentation

ECFA Early-Career Researcher Panel, :, Anamika Aggarwal +74

The European Committee for Future Accelerators (ECFA) Early-Career Researchers (ECR) Panel was invited by the ECFA Detector R&D Roadmap conveners to collect feedback from the Europ…

hep-ex2021★ 28 cited

Search for lepton number and flavour violation in $K^{+}$ and $π^{0}$ decays

NA62 Collaboration

Searches for the lepton number violating $K^{+} \to π^{-} μ^{+} e^{+}$ decay and the lepton flavour violating $K^{+} \to π^{+} μ^{-} e^{+}$ and $π^{0} \rightarrow μ…

hep-ex2021★ 155 cited

Measurement of the very rare $K^{+} \to π^{+} ν ν ˉ$ decay

NA62 Collaboration

The NA62 experiment reports the branching ratio measurement BR $(K^{+} \to π^{+} ν ν ˉ) = (10. 6_{- 3.4}^{+ 4.0} ∣_{stat} \pm 0. 9_{syst}) \times 1 0^{- 11}$ at 68% CL, base…

nucl-th2020★ 12 cited

Probing Lorentz violation in $2 ν β β$ using single electron spectra and angular correlations

O. V. Nitescu, S. A. Ghinescu, M. Mirea +1

We show that the current search for Lorentz invariance violation (LIV) in the summed energy spectra of electrons in $2 ν β β$ decay can be extended by investigating the single electro…

hep-ex2020★ 82 cited

Search for heavy neutral lepton production in $K^{+}$ decays to positrons

NA62 collaboration

A search for heavy neutral lepton ( $N$ ) production in $K^{+} \to e^{+} N$ decays using the data sample collected by the NA62 experiment at CERN in 2017--2018 is reported. Upper limits of…

Direct Calculation of the Two-Neutrino Double-Beta Decay Rate Including the Full Lepton-Energy Dependence

Updated Results for Kinematic Factors in Double Beta Decays

Searches for hidden sectors using K+→π+X decays

High-precision direct decay energy measurements of the electron-capture decay of 97Tc

Search for hadronic decays of feebly-interacting particles at NA62

Observation of the K+→π+ννˉ decay and measurement of its branching ratio

First detection of a tagged neutrino in the NA62 experiment

Theoretical analysis and predictions for the double electron capture of 124Xe

Development of a new CEDAR for kaon identification at the NA62 experiment at CERN

Search for Leptonic Decays of Dark Photons at NA62

Self-consistent calculations for atomic electron capture

A study of the K+→π0e+νγ decay

The ECFA Early Career Researcher's Panel: composition, structure, and activities, 2021 -- 2022

A measurement of the K+→π+μ+μ− decay

Performance of the NA62 trigger system

Semi-microscopic theory of two proton emission

Investigation of the Lorentz invariance violation in two-neutrino double-beta decay

Searches for lepton number violating K+→π−(π0)e+e+ decays

A biased MC for muon production for beam-dump experiments

Results of the 2021 ECFA Early-Career Researcher Survey on Training in Instrumentation

Search for lepton number and flavour violation in K+ and π0 decays

Measurement of the very rare K+→π+ννˉ decay

Probing Lorentz violation in 2νββ using single electron spectra and angular correlations

Search for heavy neutral lepton production in K+ decays to positrons

Searches for hidden sectors using $K^{+} \to π^{+} X$ decays

High-precision direct decay energy measurements of the electron-capture decay of $^{97}$ Tc

Observation of the $K^{+} \to π^{+} ν ν ˉ$ decay and measurement of its branching ratio

Theoretical analysis and predictions for the double electron capture of $^{124}$ Xe

A study of the $K^{+} \to π^{0} e^{+} ν γ$ decay

A measurement of the $K^{+} \to π^{+} μ^{+} μ^{-}$ decay

Searches for lepton number violating $K^{+} \to π^{-} (π^{0}) e^{+} e^{+}$ decays

Search for lepton number and flavour violation in $K^{+}$ and $π^{0}$ decays

Measurement of the very rare $K^{+} \to π^{+} ν ν ˉ$ decay

Probing Lorentz violation in $2 ν β β$ using single electron spectra and angular correlations

Search for heavy neutral lepton production in $K^{+}$ decays to positrons