Weakly interacting massive particle: Difference between revisions

Revision as of 06:49, 4 April 2023

Revision as of 14:48, 3 July 2023

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===The future of direct detection===

[[File:WIMPsPandaX2021.png|frame|Upper limits for WIMP-nucleon elastic cross sections from selected experiments as reported by PandaX in 2021<ref name=":0Meng et al-2021" /><ref name=":1Stephens-2021" /> (±1σ sensitivity band in green).]]

The 2020s should see the emergence of several multi-tonne mass direct detection experiments, which will probe WIMP-nucleus cross sections orders of magnitude smaller than the current state-of-the-art sensitivity. Examples of such next-generation experiments are LUX-ZEPLIN (LZ) and XENONnT, which are multi-tonne liquid xenon experiments, followed by DARWIN, another proposed liquid xenon direct detection experiment of 50–100 tonnes.<ref>{{cite arXiv |eprint=1110.0103|last1= Malling|first1= D. C.|title= After LUX: The LZ Program |display-authors= etal |class= astro-ph.IM|year= 2011}}</ref><ref>{{cite journal |last1=Baudis |first1=Laura |title=DARWIN: dark matter WIMP search with noble liquids |journal=J. Phys. Conf. Ser. |date=2012 |volume=375 |issue=1 |page=012028 |doi=10.1088/1742-6596/375/1/012028 |arxiv=1201.2402|bibcode=2012JPhCS.375a2028B |s2cid=30885844 }}</ref>

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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^{-11}</math>&nbsp;[[Picobarn|pb]] at 40&nbsp;GeV with 90% confidence level.<ref name=":0Meng 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=":1Stephens-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>

==See also==