A. E. Karneyeu

Searching for Light Dark Matter and Dark Sectors with the NA64 experiment at the CERN SPS

Yu. M. Andreev, A. Antonov, M. Ayala-Torres, D. Banerjee et autres

Since its approval in 2016, NA64 has pioneered Light Dark Matter (LDM) searches with electron [1], positron [2], muon [3], and hadron [4] beams. The experiment has successfully met its primary objectives, as outlined in the EPPS input (2018), and even exceed …

ch, it, us, ca, ru, de, es, cl (code pays fourni par la source)

Improved limits on a new $Z'$ in $B-L$ scenarios with the NA64 experiment at CERN

T K ND TPC collaboration, Yu. M. Andreev, A Antonov, M. A. Ayala Torres et autres

Extensions of the Standard Model featuring an additional $U(1)_{B-L}$ gauge symmetry provide a compelling framework linking the origin of neutrino masses to possible dark matter candidates. The associated gauge boson, $Z'$, couples directly to Standard Model fermions and can be produced in …

Improved limits on a new $Z'$ in $B-L$ scenarios with the NA64 experiment at CERN

the NA Collaboration, Yu. M. Andreev, A Antonov, M. A. Ayala Torres et autres

Extensions of the Standard Model featuring an additional $U(1)_{B-L}$ gauge symmetry provide a compelling framework linking the origin of neutrino masses to possible dark matter candidates. The associated gauge boson, $Z'$, couples directly to Standard Model fermions and can be produced in …

it, es, cl, ch, ca, de (code pays fourni par la source)

Searching for Light Dark Matter and Dark Sectors with the NA64 experiment at the CERN SPS

Yu. M. Andreev, A. Antonov, M. A. Ayala Torres, D. Banerjee et autres

Since its approval in 2016, NA64 has pioneered Light Dark Matter (LDM) searches with electron [1], positron [2], muon [3], and hadron [4] beams. The experiment has successfully met its primary objectives, as outlined in the EPPS input (2018), and even exceed …

Improved limits on a new $Z'$ in $B-L$ scenarios with the NA64 experiment at CERN

Yu.M. Andreev, A. Antonov, M.A. Ayala Torres, D. Banerjee et autres

Extensions of the Standard Model featuring an additional $U(1)_{B-L}$ gauge symmetry provide a compelling framework linking the origin of neutrino masses to possible dark matter candidates. The associated gauge boson, $Z'$, couples directly to Standard Model fermions and can be produced in …

it, es, cl, ch, ca, de (code pays fourni par la source)

High efficiency veto hadron calorimeter in the NA64 experiment at CERN

Yu. M. Andreev, A. Antonov, M. Ayala-Torres, D. Banerjee et autres

NA64 is a fixed-target experiment at the CERN SPS designed to search for Light particle Dark Matter (LDM) candidates with masses in the sub-GeV range. During the 2016-2022 runs, the experiment obtained the world-leading constraints, leaving however part of the well-motivated region …

Probing Light Dark Matter with positron beams at NA64

Yu. M. Andreev, А. Антонов, D. Banerjee, B. Banto Oberhauser et autres

We present the results of a missing-energy search for Light Dark Matter which has a new interaction with ordinary matter transmitted by a vector boson, called dark photon $A^\prime$. For the first time, this search is performed with a positron beam by …

Measurement of the intrinsic hadronic contamination in the NA64$-e$ high-purity $e^+/e^-$ beam at CERN

Yu. M. Andreev, D. Banerjee, B. Banto Oberhauser, J. Bernhard et autres

In this study, we present the measurement of the intrinsic hadronic contamination at the CERN SPS H4 beamline configured to transport electrons and positrons at 100 GeV/c momentum. The analysis was performed using data collected by the NA64-$e$ experiment in 2022. Our …

Search for a New B-L Z' Gauge Boson with the NA64 Experiment at CERN

Yu. M. Andreev, D. Banerjee, B. Banto-Oberhauser, J. Bernhard et autres

A search for a new $Z'$ gauge boson associated with (un)broken B-L symmetry in the keV-GeV mass range is carried out for the first time using the missing-energy technique in the NA64 experiment at the CERN SPS. From the analysis of the …

Search for a light muon-philic $Z^\prime$ with the NA64-$e$ experiment at CERN

D. Banerjee, B. Banto Oberhauser, J. Bernhard, P. Bisio et autres

The extension of Standard Model made by inclusion of additional $U(1)$ gauge $L_μ-L_τ$ symmetry can explain the difference between the measured and the predicted value of the muon magnetic moment and solve the tension in $B$ meson decays. This model predicts the …

Improved exclusion limit for light dark matter from e+e− annihilation in NA64

Yu. M. Andreev, D. Banerjee, J. Bernhard, M. Bondí et autres

The current most stringent constraints for the existence of sub-GeV dark matter coupling to Standard Model via a massive vector boson ${A}^{\ensuremath{'}}$ were set by the NA64 experiment for the mass region ${m}_{{A}^{\ensuremath{'}}}\ensuremath{\lesssim}250\text{ }\text{ }\mathrm{MeV}$, by analyzing data from the interaction of …

ru, ch, it, gb, gr, de, cl, es (code pays fourni par la source)

Search for Axionlike and Scalar Particles with the NA64 Experiment

D. Banerjee, J. Bernhard, V.E. Burtsev, А. Г. Чумаков et autres

We carried out a model-independent search for light scalar (s) and pseudoscalar axionlike (a) particles that couple to two photons by using the high-energy CERN SPS H4 electron beam. The new particles, if they exist, could be produced through the Primakoff effect …

us, ch, ru, gb, gr, de, cl (code pays fourni par la source)