Weakly interacting massive particle: Difference between revisions

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Such multi-tonne experiments will also face a new background in the form of neutrinos, which will limit their ability to probe the WIMP parameter space beyond a certain point, known as the neutrino floor. However, although its name may imply a hard limit, the neutrino floor represents the region of parameter space beyond which experimental sensitivity can only improve at best as the square root of exposure (the product of detector mass and running time).<ref>{{cite journal |last1=Billard |first1=J. |last2=Strigari |first2=L. |last3=Figueroa-Feliciano |first3=E. |title=Implication of neutrino backgrounds on the reach of next generation dark matter direct detection experiments |journal=Phys. Rev. D |date=2014 |volume=89 |issue=2 |page=023524 |doi=10.1103/PhysRevD.89.023524 |arxiv=1307.5458|bibcode = 2014PhRvD..89b3524B |s2cid=16208132 }}</ref><ref>{{cite journal |last1=Davis |first1=Jonathan H. |title=Dark Matter vs. Neutrinos: The effect of astrophysical uncertainties and timing information on the neutrino floor |journal=Journal of Cosmology and Astroparticle Physics |date=2015 |volume=1503 |issue=3 |page=012 |doi=10.1088/1475-7516/2015/03/012 |arxiv=1412.1475|bibcode = 2015JCAP...03..012D |s2cid=118596203 }}</ref> For WIMP masses below 10 GeV the dominant source of neutrino background is from the [[Solar neutrino|Sun]], while for higher masses the background contains contributions from [[Neutrino#Atmospheric|atmospheric neutrino]]s and the [[diffuse supernova neutrino background]].

In December 2021, results from [[PandaX]] have found no signal in their data, with a lowest excluded cross section of <math>3.8\times10^{-1147} cm^2</math>&nbsp;[[Picobarn|pb]] at 40&nbsp; GeV with 90% confidence level.<ref name="Meng et al-2021">{{Cite journal|last1=Meng|first1=Yue|last2=Wang|first2=Zhou|last3=Tao|first3=Yi|last4=Abdukerim|first4=Abdusalam|last5=Bo|first5=Zihao|last6=Chen|first6=Wei|last7=Chen|first7=Xun|last8=Chen|first8=Yunhua|last9=Cheng|first9=Chen|last10=Cheng|first10=Yunshan|last11=Cui|first11=Xiangyi|date=2021-12-23|title=Dark Matter Search Results from the PandaX-4T Commissioning Run|url=https://link.aps.org/doi/10.1103/PhysRevLett.127.261802|journal=Physical Review Letters|language=en|volume=127|issue=26|pages=261802|doi=10.1103/PhysRevLett.127.261802|pmid=35029500| arxiv=2107.13438 | bibcode=2021PhRvL.127z1802M |s2cid=236469421|issn=0031-9007}}</ref><ref name="Stephens-2021">{{Cite journal|last=Stephens|first=Marric|date=2021-12-23|title=Tightening the Net on Two Kinds of Dark Matter|url=https://physics.aps.org/articles/v14/s164|journal=Physics|language=en|volume=14| doi=10.1103/Physics.14.s164 | bibcode=2021PhyOJ..14.s164S | s2cid=247277808 |doi-access=free}}</ref> In July 2022 the [[LZ experiment]] published its first limit excluding cross sections above <math>6.5\times10^{-12}</math>&nbsp;[[Picobarn|pb]] at 30 GeV with 90% confidence level.<ref>{{Cite arXiv|last1=Aalbers |first1=J. |last2=Akerib |first2=D. S. |last3=Akerlof |first3=C. W. |last4=Musalhi |first4=A. K. Al |last5=Alder |first5=F. |last6=Alqahtani |first6=A. |last7=Alsum |first7=S. K. |last8=Amarasinghe |first8=C. S. |last9=Ames |first9=A. |last10=Anderson |first10=T. J. |last11=Angelides |first11=N. |date=2022-07-18 |title=First Dark Matter Search Results from the LUX-ZEPLIN (LZ) Experiment |class=hep-ex |eprint=2207.03764}}</ref><ref>{{Cite web |date=2022-07-07 |title=A supersensitive dark matter search found no signs of the substance — yet |url=https://www.sciencenews.org/article/dark-matter-lz-experiment-physics |access-date=2022-08-05 |website=Science News |language=en-US}}</ref>

In July 2023 the [[XENON#XENONnT|XENONnT]] and [[LZ experiment]] published the first results of their searches for WIMPs<ref>{{Cite journal |last=Day |first=Charles |date=2023-07-28 |title=The Search for WIMPs Continues |url=https://physics.aps.org/articles/v16/s106 |journal=Physics |language=en |volume=16 |pages=s106 |doi=10.1103/PhysRevLett.131.041002}}</ref>, the first excluding excluding cross sections above <math>2.58\times10^{-47} cm^2</math> at 28 GeV with 90% confidence level<ref>{{Cite journal |last=XENON Collaboration |last2=Aprile |first2=E. |last3=Abe |first3=K. |last4=Agostini |first4=F. |last5=Ahmed Maouloud |first5=S. |last6=Althueser |first6=L. |last7=Andrieu |first7=B. |last8=Angelino |first8=E. |last9=Angevaare |first9=J. R. |last10=Antochi |first10=V. C. |last11=Antón Martin |first11=D. |last12=Arneodo |first12=F. |last13=Baudis |first13=L. |last14=Baxter |first14=A. L. |last15=Bazyk |first15=M. |date=2023-07-28 |title=First Dark Matter Search with Nuclear Recoils from the XENONnT Experiment |url=https://link.aps.org/doi/10.1103/PhysRevLett.131.041003 |journal=Physical Review Letters |volume=131 |issue=4 |pages=041003 |doi=10.1103/PhysRevLett.131.041003}}</ref> and the second cross sections above <math>9.2\times10^{-48} cm^2</math> at 36 GeV with 90% confidence level.<ref>{{Cite journal |last=LUX-ZEPLIN Collaboration |last2=Aalbers |first2=J. |last3=Akerib |first3=D. S. |last4=Akerlof |first4=C. W. |last5=Al Musalhi |first5=A. K. |last6=Alder |first6=F. |last7=Alqahtani |first7=A. |last8=Alsum |first8=S. K. |last9=Amarasinghe |first9=C. S. |last10=Ames |first10=A. |last11=Anderson |first11=T. J. |last12=Angelides |first12=N. |last13=Araújo |first13=H. M. |last14=Armstrong |first14=J. E. |last15=Arthurs |first15=M. |date=2023-07-28 |title=First Dark Matter Search Results from the LUX-ZEPLIN (LZ) Experiment |url=https://link.aps.org/doi/10.1103/PhysRevLett.131.041002 |journal=Physical Review Letters |volume=131 |issue=4 |pages=041002 |doi=10.1103/PhysRevLett.131.041002}}</ref>

==See also==