A. Antonelli

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

E. Cortina, J. Jerhot, E. Minucci, S. Padolski et autres

A bstract Results from the study of the rare decays $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ K + → π + ν ν ¯ , K + → π + μ + μ − and K + → π + γγ at the …

be, de, it, Ghana, ca, cz, gb, ch, fr, bg, mx (code pays fourni par la source)

Search for hadronic decays of feebly-interacting particles at NA62

E. Cortina, J. Jerhot, N. Lurkin, T. Numao et autres

Abstract 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, including dark photons, dark scalars, and axion-like particles, may be produced …

ch, de, ca, cz, gb, fr, it, bg, be (code pays fourni par la source)

First search for K+ → π0πμe decays

M. U. Ashraf, E. Cortina, E. Minucci, S. Padolski et autres

International audience

fr (code pays fourni par la source)

Search for Leptonic Decays of Dark Photons at NA62

E. Cortina, J. Jerhot, A. Kleimenova, N. Lurkin et autres

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 1.4×10^{17} protons on dump collected in 2021. No evidence for a dark photon signal is observed. The combined …

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Readout studies for the HIKE main electromagnetic calorimeter

M. Francesconi, F. Ambrosino, A. Antonelli, G. De Nardo et autres

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

A. Bethani, E. Cortina, J. Jerhot, N. Lurkin et autres

Abstract 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 hadrons. The CEDAR-H detector was developed to minimise the amount of material in the path of …

be, ca, cz, fr, de, it, mx (code pays fourni par la source)

Measurement of the K+ → π+γγ decay

E. Cortina, A. Kleimenova, E. Minucci, S. Padolski et autres

A sample of 3984 candidates of the K+→π+γγ decay, with an estimated background of 291±14 events, was collected by the NA62 experiment at CERN during 2017–2018. In order to describe the observed di-photon mass spectrum, the next-to-leading order contribution in chiral perturbation …

be, ca, cz, fr, it, gb (code pays fourni par la source)

Search for dark photon decays to μ+μ− at NA62

E. Cortina, J. Jerhot, A. Kleimenova, N. Lurkin et autres

A bstract The NA62 experiment at CERN, designed to study the ultra-rare decay K + → π + $$ \nu \overline{\nu} $$ ν ν ¯ , has also collected data in beam-dump mode. In this configuration, dark photons may be produced by …

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A search for the K+ → μ−νe+e+ decay

E. Cortina, A. Kleimenova, E. Minucci, S. Padolski et autres

A search for the K + → μ − ν e + e + decay, forbidden within the Standard Model by either lepton number or lepton flavour conservation depending on the flavour of the emitted neutrino, has been performed using the dataset …

be, ca, cz, de, it (code pays fourni par la source)

Search for K+ decays to a lepton and invisible particles

N. Lurkin, A. Akmete, R. Aliberti, F. Ambrosino et autres

Searches for heavy neutral leptons $N$ in the $K^+\to e^+N$ and $K^+\to \mu^+N$ decay channels using the dataset collected by the NA62 experiment at CERN between 2016-2018 are presented. Upper limits on the corresponding mixing matrix elements are reported at the level …

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Study of the a0(980) meson via the radiative decay ϕ→ηπ0γ with the KLOE detector

F. Ambrosino, A. Antonelli, M. Antonelli, F. Archilli et autres

We have studied the ϕ→a0(980)γ process with the KLOE detector at the Frascati ϕ-factory DAΦNE by detecting the ϕ→ηπ0γ decays in the final states with η→γγ and η→π+π−π0. We have measured the branching ratios for both final states: Br(ϕ→ηπ0γ)=(7.01±0.10±0.20)×10−5 and (7.12±0.13±0.22)×10−5, respectively. …

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Measurement of the branching ratio and search for a CP violating asymmetry in the η → π + π − e + e − ( γ ) decay at KLOE

F. Ambrosino, A. Antonelli, Manila Antonelli, F. Archilli et autres

We have studied the η → π + π − e + e − ( γ ) decay using about 1.7 fb − 1 collected by the KLOE experiment at the DAΦNE ϕ -factory. This corresponds to about 72 millions η mesons …

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