Estimation lemma

2013-04-13T07:42:04Z

94.169.31.81:

{{coord|22.5953|N|114.5431|E|display=title}}
The '''Daya Bay Reactor Neutrino Experiment''' is a [[China]]-based multinational [[particle physics]] project studying [[neutrino]]s. The multinational collaboration includes researchers from China, the United States, Taiwan, Russia, and the Czech Republic. The US side of the project is funded by the [[United States Department of Energy|US Department of Energy]]'s Office of High Energy Physics.

It is situated at [[Daya Bay]], approximately 52 kilometers northeast of [[Hong Kong]] and 45 kilometers east of [[Shenzhen]]. There is an affiliated project in the [[Aberdeen Tunnel Underground Laboratory]] in Hong Kong. It measures the [[neutron]]s produced by [[cosmic ray|cosmic]] [[muon]]s which may affect the Daya Bay Reactor Neutrino Experiment.

==Neutrino oscillations==
The experiment studies [[neutrino oscillations]] and is designed to measure the [[mixing angle]] [[PMNS matrix|''θ''13]] using [[antineutrino]]s produced by the reactors of the [[Daya Bay Nuclear Power Plant]] and the [[Ling Ao Nuclear Power Plant]]. Scientists are also interested in whether neutrinos are [[CP-violation|CP violators]].

On 8 March 2012, the Daya Bay collaboration announced<ref>{{cite journal|author=Daya Bay Collaboration|arxiv=1203.1669|title=Observation of electron-antineutrino disappearance at Daya Bay|year=2012|journal=Physical Review Letters|volume=108|issue=17|pages=171803|doi=10.1103/PhysRevLett.108.171803|arxiv=1203.1669|bibcode = 2012PhRvL.108q1803A }}</ref><ref>{{cite web|author=Adrian Cho|url=http://news.sciencemag.org/sciencenow/2012/03/physicists-in-china-nail-a-key.html|title=Physicists in China Nail a Key Neutrino Measurement|date=8 March 2012|publisher=ScienceNow}}</ref><ref>{{cite web|author=Eugenie Samuel Reich
|url=http://www.nature.com/news/neutrino-oscillations-measured-with-record-precision-1.10202|title=Neutrino oscillations measured with record precision|date=8 March 2012|publisher=NatureNews|doi=10.1038/nature.2012.10202}}</ref> a [[Statistical significance#In terms of σ (sigma)|5.2σ]] discovery of ''θ''13 ≠ 0, with
: <math> \sin^2 (2\theta_{13}) = 0.092 \pm 0.016 \, \mathrm{(stat)} \pm 0.005\, \mathrm{(syst)}. </math>

This significant result represents a new type of oscillation and is surprisingly large.<ref>http://neutrino.physics.berkeley.edu/news/News.html</ref> It is consistent with earlier, but less significant results by [[T2K]], [[MINOS]] and [[Double Chooz]]. With ''θ''13 so large, [[NOνA]] has about a 50% probability of being sensitive to the neutrino mass hierarchy. Experiments may also be able to probe CP violation among neutrinos.

== Collaborators ==
{{columns-list|3|
*[[Beijing Normal University]]
*[[Brookhaven National Laboratory]]
*[[California Institute of Technology]]
*[[Charles University]]
*[[Chengdu University of Technology]]
*[[China Guangdong Nuclear Power Group]]
*[[China Institute of Atomic Energy]]
*[[Chinese Academy of Sciences]]
*[[Chinese University of Hong Kong]]
*[[College of William and Mary]]
*[[Dongguan Institute of Technology]]
*[[Illinois Institute of Technology]]
*[[Institute of High Energy Physics]]
*[[Iowa State University]]
*[[Joint Institute for Nuclear Research]]
*[[Kurchatov Institute]]
*[[Lawrence Berkeley National Laboratory]] and [[University of California at Berkeley]]
*[[Nanjing University]]
*[[Nankai University]]
*[[National Chiao-Tung University]]
*[[National Taiwan University]]
*[[National United University]]
*[[Princeton University]]
*[[Rensselaer Polytechnic Institute]]
*[[Shandong University]]
*[[Shanghai Jiao Tong University]]
*[[Shenzhen University]]
*[[Siena College]]
*[[Sun Yat-sen University|Sun Yat-Sen (Zhongshan) University]]
*[[Tsinghua University]]
*[[University of California at Los Angeles]]
*[[University of Hong Kong]]
*[[University of Houston]]
*[[University of Illinois at Urbana-Champaign]]
*[[University of Science and Technology of China]]
*[[University of Wisconsin]]
*[[Virginia Polytechnic Institute and State University]]
}}

==References==
<references />

==External links ==
* [http://dayawane.ihep.ac.cn/ Home Page]
* [http://www.symmetrymagazine.org/cms/?pid=1000393 Catching neutrinos in China] from ''[[Symmetry Magazine]]''
* [http://theta13.phy.cuhk.edu.hk/ Daya Bay ''θ''13 Reactor Neutrino Experiment & Aberdeen Cosmic Ray Muon-induced Neutron Experiment] from Department of Physics, The Chinese University of Hong Kong

{{Neutrino detectors}}

[[Category:Reactor neutrino experiments]]
[[Category:Science and technology in the People's Republic of China]]
[[Category:Nuclear technology in China]]

formulasearchengine - User contributions [en]

Estimation lemma