A. Karneyeu
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View article: Silicon Photomultipliers in the CMS upgrade
Silicon Photomultipliers in the CMS upgrade Open
Silicon Photomultipliers (SiPM) will be used extensively in the upgraded CMS detector at the Large Hadron Collider. SiPMs have already been implemented into the barrel and endcap hadron calorimeters (HCAL) as part of the Phase I upgrade, a…
View article: Proof of principle for a light dark matter search with low-energy positron beams at NA64
Proof of principle for a light dark matter search with low-energy positron beams at NA64 Open
A bstract Thermal light dark matter (LDM) with particle masses in the 1 MeV–1 GeV range could successfully explain the observed dark matter abundance as a relic from the primordial Universe. In this picture, a new feeble interaction acts a…
View article: Proof of principle for a light dark matter search with low-energy positron beams at NA64
Proof of principle for a light dark matter search with low-energy positron beams at NA64 Open
Thermal light dark matter (LDM) with particle masses in the 1 MeV - 1 GeV range could successfully explain the observed dark matter abundance as a relic from the primordial Universe. In this picture, a new feeble interaction acts as a "por…
View article: Shedding light on dark sectors with high-energy muons at the NA64 experiment at the CERN SPS
Shedding light on dark sectors with high-energy muons at the NA64 experiment at the CERN SPS Open
A search for dark sectors is performed using the unique M2 beam line at the CERN Super Proton Synchrotron. New particles (X) could be produced in the bremsstrahlung-like reaction of high-energy 160 GeV positively charged muons impinging on…
View article: Dark-Sector Search via Pion-Produced <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>η</mml:mi></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>η</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math> Mesons Decaying Invisibly in the NA64h Detector
Dark-Sector Search via Pion-Produced and Mesons Decaying Invisibly in the NA64h Detector Open
We present the first results from a proof-of-concept search for dark sectors via invisible decays of pseudoscalar η and η′ mesons in the NA64h experiment at the CERN SPS. Our novel technique uses the charge-exchange reaction of 50 GeV π− o…
View article: Shedding light on Dark Sectors with high-energy muons at the NA64 experiment at the CERN SPS
Shedding light on Dark Sectors with high-energy muons at the NA64 experiment at the CERN SPS Open
A search for Dark Sectors is performed using the unique M2 beam line at the CERN Super Proton Synchrotron. New particles ($X$) could be produced in the bremsstrahlung-like reaction of high energy 160 GeV muons impinging on an active target…
View article: Event-generator validation with MCPLOTS and LHC@home
Event-generator validation with MCPLOTS and LHC@home Open
We document several recent updates to the MCPLOTS event-generator validation resource. The project is based on the RIVET analysis library and harnesses volunteer computing provided by LHC@home to generate high-statistics MC comparisons to …
View article: 50 GeV $π^-$ in, nothing out: a sensitive probe of invisible $η$ and $η'$ decays with NA64h
50 GeV $π^-$ in, nothing out: a sensitive probe of invisible $η$ and $η'$ decays with NA64h Open
We present the first results from a proof-of-concept search for dark sectors via invisible decays of pseudoscalar $η$ and $η'$ mesons in the NA64h experiment at the CERN SPS. Our novel technique uses the charge-exchange reaction of 50 GeV …
View article: First Results in the Search for Dark Sectors at NA64 with the CERN SPS High Energy Muon Beam
First Results in the Search for Dark Sectors at NA64 with the CERN SPS High Energy Muon Beam Open
We report the first search for dark sectors performed at the NA64 experiment employing a high energy muon beam and a missing energy-momentum technique. Muons from the M2 beamline at the CERN Super Proton Synchrotron with a momentum of 160 …
View article: First constraints on the $L_μ-L_τ$ explanation of the muon $g-2$ anomaly from NA64-$e$ at CERN
First constraints on the $L_μ-L_τ$ explanation of the muon $g-2$ anomaly from NA64-$e$ at CERN Open
The inclusion of an additional $U(1)$ gauge $L_μ-L_τ$ symmetry would release the tension between the measured and the predicted value of the anomalous muon magnetic moment: this paradigm assumes the existence of a new, light $Z^\prime$ vec…
View article: Probing light dark matter with positron beams at NA64
Probing light dark matter with positron beams at NA64 Open
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′. For the first time, this search is performed with a positron bea…
View article: Event-Generator Validation with MCPLOTS and LHC@home
Event-Generator Validation with MCPLOTS and LHC@home Open
We document several recent updates to the MCPLOTS event-generator validation resource. The project is based on the RIVET analysis library and harnesses volunteer computing provided by LHC@home to generate high-statistics MC comparisons to …
View article: Exploration of the Muon $g-2$ and Light Dark Matter explanations in NA64 with the CERN SPS high energy muon beam
Exploration of the Muon $g-2$ and Light Dark Matter explanations in NA64 with the CERN SPS high energy muon beam Open
We report on a search for a new $Z'$ ($L_μ-L_τ$) vector boson performed at the NA64 experiment employing a high energy muon beam and a missing energy-momentum technique. Muons from the M2 beamline at the CERN Super Proton Synchrotron with …
View article: Search for Light Dark Matter with NA64 at CERN
Search for Light Dark Matter with NA64 at CERN Open
Thermal dark matter models with particle χ masses below the electroweak scale can provide an explanation for the observed relic dark matter density. This would imply the existence of a new feeble interaction between the dark and ordinary m…
View article: Integration of thermo-electric coolers into the CMS MTD SiPM arrays for operation under high neutron fluence
Integration of thermo-electric coolers into the CMS MTD SiPM arrays for operation under high neutron fluence Open
The barrel section of the novel MIP Timing Detector (MTD) will be constructed as part of the upgrade of the CMS experiment to provide a time resolution for single charged tracks in the range of $30-60$ ps using LYSO:Ce crystal arrays read …
View article: Integration of thermo-electric coolers into the CMS MTD SiPM arrays for operation under high neutron fluence
Integration of thermo-electric coolers into the CMS MTD SiPM arrays for operation under high neutron fluence Open
The barrel section of the novel MIP Timing Detector (MTD) will be constructed as part of the upgrade of the CMS experiment to provide a time resolution for single charged tracks in the range of 30–60 ps using LYSO:Ce crystal arrays read ou…
View article: Search for Light Dark Matter with NA64 at CERN
Search for Light Dark Matter with NA64 at CERN Open
Thermal dark matter models with particle $χ$ masses below the electroweak scale can provide an explanation for the observed relic dark matter density. This would imply the existence of a new feeble interaction between the dark and ordinary…
View article: Improved exclusion limit for light dark matter from $e^+e^-$ annihilation in NA64
Improved exclusion limit for light dark matter from $e^+e^-$ annihilation in NA64 Open
The current most stringent constraints for the existence of sub-GeV dark matter coupling to Standard Model via a massive vector boson $A^\prime$ were set by the NA64 experiment for the mass region $m_{A^\prime}\lesssim 250$ MeV, by analyzi…
View article: Test beam characterization of sensor prototypes for the CMS Barrel MIP Timing Detector
Test beam characterization of sensor prototypes for the CMS Barrel MIP Timing Detector Open
The MIP Timing Detector will provide additional timing capabilities for detection of minimum ionizing particles (MIPs) at CMS during the High Luminosity LHC era, improving event reconstruction and pileup rejection. The central portion of t…
View article: Constraints on New Physics in Electron <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>g</mml:mi><mml:mo>−</mml:mo><mml:mn>2</mml:mn></mml:math> from a Search for Invisible Decays of a Scalar, Pseudoscalar, Vector, and Axial Vector
Constraints on New Physics in Electron from a Search for Invisible Decays of a Scalar, Pseudoscalar, Vector, and Axial Vector Open
We performed a search for a new generic X boson, which could be a scalar (S), pseudoscalar (P), vector (V), or an axial vector (A) particle produced in the 100 GeV electron scattering off nuclei, e-Z→e-ZX, followed by its invisible decay i…
View article: Search for pseudoscalar bosons decaying into $e^+e^-$ pairs
Search for pseudoscalar bosons decaying into $e^+e^-$ pairs Open
We report the results of a search for a light pseudoscalar particle $a$ that
couples to electrons and decays to $e^+e^-$ performed using the high-energy
CERN SPS H4 electron beam. If such pseudoscalar with a mass $\simeq 17$ MeV
exists, it…
View article: Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel
Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel Open
We report the results of a search for a new vector boson ($A'$) decaying into\ntwo dark matter particles $\\chi_1 \\chi_2$ of different mass. The heavier\n$\\chi_2$ particle subsequently decays to $\\chi_1$ and $A' \\to e^- e^+$. For a\nsu…
View article: Hunting down the X17 boson at the CERN SPS
Hunting down the X17 boson at the CERN SPS Open
Recently, the ATOMKI experiment has reported new evidence for the excess of $e^+ e^-$ events with a mass $\sim$17 MeV in the nuclear transitions of $^4$He, that they previously observed in measurements with $^8$Be. These observations could…
View article: Search for scalar and axionlike particles with the NA64 experiment
Search for scalar and axionlike particles with the NA64 experiment Open
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 thro…
View article: Report on 1912.05451v2
Report on 1912.05451v2 Open
First released in 2010, the Rivet library forms an important repository for analysis code, facilitating comparisons between measurements of the final state in particle collisions and theoretical calculations of those final states.We give a…
View article: Report on 1912.05451v2
Report on 1912.05451v2 Open
First released in 2010, the Rivet library forms an important repository for analysis code, facilitating comparisons between measurements of the final state in particle collisions and theoretical calculations of those final states.We give a…
View article: Dark Matter Search in Missing Energy Events with NA64
Dark Matter Search in Missing Energy Events with NA64 Open
A search for sub-GeV dark matter production mediated by a new vector boson A^{'}, called a dark photon, is performed by the NA64 experiment in missing energy events from 100 GeV electron interactions in an active beam dump at the CERN SPS.…
View article: Erratum: Dose rate effects in the radiation damage of the plastic scintillators of the CMS hadron endcap calorimeter
Erratum: Dose rate effects in the radiation damage of the plastic scintillators of the CMS hadron endcap calorimeter Open
Subsequent to the publication of this paper, one of the hybrid photodiodes used as the photode- tector was removed and highly localized damage on its photocathode was discovered. The study of the photodiode cathode was published in Review …