P. Lichard

collaborators

8 papers

hep-ph2026

A subthreshold pole in electron-positron annihilation into the $D_{s}^{+} D_{s}^{-}$ final state

Peter Lichard, Josef JurÃ¡Å

Using precise data from the BESIII collaboration, we obtained compelling evidence of a subthreshold pole in the $e^{+} e^{-} \to D_{s}^{+} D_{s}^{-}$ process with mass of (3896$^{+13}_{…

hep-ex2026

Search for heavy neutral leptons in $I ¨ ^{+}$ decays to positrons

NA62 Collaboration

A search for heavy neutral lepton ( $N$ ) production in $I ¨ ^{+} \to e^{+} N$ in-flight decays using data collected by the NA62 experiment at CERN in 2017-2024 is reported. Upper limits fo…

hep-ph2025

Subthreshold poles in electron-positron annihilation. D\bar{D} final states

Peter Lichard

We show that the $I ¨ (2 S)$ subthreshold pole influences the cross section of the electron-positron annihilation into the $D^{+} D^{-}$ and $\mathrm D^0\bar\mathrm…

hep-ex2025

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

NA62 Collaboration

Results from the study of the rare decays $K^{+} \to I ¨ ^{+} I^½ I^ˉ ½$ , $K^{+} \to I ¨ ^{+} I^¼^{+} I^¼^{-}$ and $K^{+} \to I ¨ ^{+} I^^{3} I^^{3}$ at the NA62 experiment at CERN are interpreted…

hep-ex2025

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-ex2025

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 Î¼^…

A subthreshold pole in electron-positron annihilation into the Ds+​Ds−​ final state

Search for heavy neutral leptons in I¨+ decays to positrons

Subthreshold poles in electron-positron annihilation. D\bar{D} final states

Searches for hidden sectors using K+→I¨+X decays

Search for hadronic decays of feebly-interacting particles at NA62

First detection of a tagged neutrino in the NA62 experiment

A subthreshold pole in electron-positron annihilation into the $D_{s}^{+} D_{s}^{-}$ final state

Search for heavy neutral leptons in $I ¨ ^{+}$ decays to positrons

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