REVIEW 8 cited by
Search for Axionlike and Scalar Particles with the NA64 Experiment
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
abstract
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 in interactions of hard bremsstrahlung photons generated by 100 GeV electrons in the NA64 active dump with virtual photons provided by the nuclei of the dump. The a(s) would penetrate the downstream HCAL module, serving as shielding, and would be observed either through their $a(s)\to\gamma \gamma$ decay in the rest of the HCAL detector or as events with large missing energy if the a(s) decays downstream of the HCAL. This method allows for the probing the a(s) parameter space, including those from generic axion models, inaccessible to previous experiments. No evidence of such processes has been found from the analysis of the data corresponding to $2.84\times10^{11}$ electrons on target allowing to set new limits on the $a(s)\gamma\gamma$-coupling strength for a(s) masses below 55 MeV.
Forward citations
Cited by 8 Pith papers
-
MeV Electrophilic Axion-like Particles from Sun
MeV axion-like particles could be made when 5.5 MeV solar fusion photons Compton-scatter off electrons; current LZ, PandaX-4T and Borexino data would then constrain g_ae to (1.7-3.7)e-6 in the 0.4-1 MeV window.
-
Searching for long-lived ALPs with a laser-assisted optical dump
A laser-assisted optical dump could probe ALP-electron couplings down to ~10^-6 (10^-7) GeV^-1 with 16.5 (125) GeV electron beams, and when both couplings are present the Primakoff process improves the electron-coupli...
-
Naturally quality-safe GeV axion with charm coupling
A charm-coupled GeV axion with m_φ ~ 3–4 MeV is quality-safe without extra symmetry, avoids isospin violation, and predicts ΔN_eff ~ −0.1 plus BR(B→Kσ) ~ 2×10^{-5}.
-
Naturally quality-safe GeV axion with charm coupling
Coupling the GeV-scale QCD axion to charm instead of light quarks avoids the isospin problem and yields BR(B→Kσ) ~ 2×10^-5 consistent with Belle II, at the price of a small scalar quartic requiring protection.
-
Searches for GeV-Scale ALPs at RHIC
Proposes searching for GeV-scale ALPs in ultra-peripheral collisions at RHIC via γγ → a → γγ, estimating sensitivity to m_a ~2-5 GeV and g_aγγ ≳4e-4 GeV^{-1} with existing PHENIX data.
-
Axion-like Particle Search with a Light-Shining-Through-Walls Setup at a $\gamma$-$\gamma$ Collider
A light-shining-through-walls search using a gamma-gamma collider's inverse-Compton photon beam could reach g_aγγ ≈ 3.8e-5 GeV^-1 for m_a < 0.1 eV.
-
Search for Sub-GeV Axion-Like Particles at EBES Pilot Run Using 4 GeV Positron Beam at KEK LINAC
No events observed in pilot run with 1.3e14 positrons on target, yielding new upper limits on sub-GeV ALP parameters via Primakoff production and diphoton decay.
-
Axions and Axion-like particles: collider searches
A pedagogical review of the ALP effective field theory, production and decay at colliders, indirect search strategies, and a summary of current bounds on the ALP-photon coupling.
Discussion (0). Sign in to comment.