NA64 experiment

{{Short description|International scientific experiment at CERN}}

File:NA64_experiment.jpg

NA64 experiment is one of the several experiments at CERN's Super Proton Synchrotron (SPS) particle collider searching for dark sector particles.{{Cite journal|last=Krasnikov|first=N. V.|year=2020|title=The Search for Light Dark Matter at NA64 Experiment|url=http://link.springer.com/10.1134/S1063779620040449|journal=Physics of Particles and Nuclei|language=en|volume=51|issue=4|pages=697–702|doi=10.1134/S1063779620040449|bibcode=2020PPN....51..697K |issn=1063-7796|url-access=subscription}}{{Cite book|last1=Banerjee|first1=Dipanwita|last2=NA64 collaboration|last3=Physics Beyond Colliders Conventional Beams Working Group |title=Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2019) |chapter=Search for Dark Sector Physics at the NA64 experiment in the context of the Physics Beyond Colliders Projects |year=2019|volume=367 |language=en|pages=061|doi=10.22323/1.367.0061|arxiv=1909.04363 |bibcode=2019lpih.confE..61B |doi-access=free}}{{Cite book|last=Kirsanov|first=Mikhail|title=Particle Physics at the Silver Jubilee of Lomonosov Conferences |chapter=Search for Dark Sector Physics in Missing Energy Events in the NA64 Experiment |year=2019 |chapter-url=https://www.worldscientific.com/doi/abs/10.1142/9789811202339_0066 |language=en|location=Moscow, Russia|publisher=World Scientific|pages=353–369|doi=10.1142/9789811202339_0066|isbn=978-981-12-0232-2|s2cid=195550676 }} It is a fixed target experiment in which an electron beam of energy between 100-150 GeV, strikes fixed atomic nuclei. The primary goal of NA64 is to find unknown and hypothetical particles such as dark photons, axions, and axion-like particles.{{Cite web|title=NA64|url=https://home.cern/science/experiments/na64|access-date=2021-05-02|website=CERN|language=en}}{{Cite journal|last1=Dusaev|first1=R. R.|last2=Kirpichnikov|first2=D. V.|last3=Kirsanov|first3=M. M.|year=2020|title=Photoproduction of axionlike particles in the NA64 experiment|journal=Physical Review D|language=en|volume=102|issue=5|pages=055018|doi=10.1103/PhysRevD.102.055018|arxiv=2004.04469|bibcode=2020PhRvD.102e5018D |issn=2470-0010|doi-access=free}}{{Cite journal|last=Bernhard|first=J.|year=2020|title=Status and Plans for the NA64 Experiment|journal=Journal of Physics: Conference Series|volume=1468|issue=1|pages=012023|doi=10.1088/1742-6596/1468/1/012023|issn=1742-6588|doi-access=free}}

Secondarily this experiment will also use the muon beams from the SPS with the goal of finding particles that mainly interact with muons and hence could give valuable insights into muon's anomalous magnetic moment. Few other goals of NA64 include searching for invisible neutral kaon decays and meson decays, as well as the hunt of particles that could consist the mirror-type dark matter.{{Cite journal|last=Kirsanov|first=Mikhail|year=2019|editor-last=Achasov|editor-first=M.N.|editor2-last=Ignatov|editor2-first=F.V.|editor3-last=Krokovny|editor3-first=P.P.|title=Recent results of the NA64 experiment at the CERN SPS|journal=EPJ Web of Conferences|volume=212|pages=06005|doi=10.1051/epjconf/201921206005|bibcode=2019EPJWC.21206005K |issn=2100-014X|doi-access=free}}{{Cite journal|last1=Banerjee|first1=D.|last2=Bernhard|first2=J.|last3=Burtsev|first3=V. E.|last4=Chumakov|first4=A. G.|last5=Cooke|first5=D.|last6=Crivelli|first6=P.|last7=Depero|first7=E.|last8=Dermenev|first8=A. V.|last9=Donskov|first9=S. V.|last10=Dusaev|first10=R. R.|last11=Enik|first11=T.|year=2020|title=Search for Axionlike and Scalar Particles with the NA64 Experiment|journal=Physical Review Letters|language=en|volume=125|issue=8|pages=081801|doi=10.1103/PhysRevLett.125.081801|pmid=32909809 |arxiv=2005.02710|bibcode=2020PhRvL.125h1801B |issn=0031-9007|doi-access=free}}