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VERSION:2.0
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BEGIN:VEVENT
DTSTAMP:20260921T115206Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20120319T163000Z
DTEND:20120319T173000Z
UID:event889@bu.edu
URL:http://physics.bu.edu/internal/events/show/889
SUMMARY:Observation of Electron Antineutrino Disappearance at Daya Bay
DESCRIPTION:Featuring Wei Wang\, William and Mary\n\nPart of the HET Semina
	r Series.\n\nThe theory of neutrino oscillation has been widely accepted in
	 recent years. In a three-neutrino framework\, there are three mixing 
	angles in the theory. However\, an accurate measurement on one of the 
	three mixing angles\, 13\, stayed elusive. Knowing all three mixing an
	gles is necessary to explore the remaining parameters in neutrino osci
	llation. To measure this least known mixing angle\, a few dedicated ex
	periments have been constructed and collecting data. Located on a nucl
	ear power plant campus in Southern China which hosts a complex of six 
	2.9 GW reactors\, the Daya Bay reactor neutrino experiment is designed to&n
	bsp;be the most sensitive one. In the three underground experimental halls\
	, Daya Bay currently has six 20t Gd-doped liquid scintillator antineut
	rino detectors deployed\, detecting the copious electron-antineutrinos
	 released by the six reactors. With eight weeks of data collected sinc
	e Dec 24\, 2011\, 10\,416 (80\,376) electron antineutrino candidates w
	ere detected at the far hall (near halls). Using the near hall data to
	 constrain the antineutrino flux\, we find the ratio of the observed to&nbs
	p;expected number of antineutrinos at the far hall is 0.940+-0.012. A rate-
	only analysis finds sin2 2theta13 = 0.092 +- 016(stat)  +- 0.005(
	syst) in a three-neutrino framework. The significance level of the Day
	a Bay measurment is at 5.2 standard deviation level. This is the first
	 over 5-sigma measurement of sin2 2theta13. In this talk\, we will rep
	ort how the Daya Bay experiment was designed\, installed\, commissione
	d and how we perform the data analysis to extract the value of sin2 2t
	heta13.
LOCATION:PRB 595\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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