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DTSTAMP:20261021T072349Z
LAST-MODIFIED:20160324T155744Z
DTSTART:20160406T183000Z
DTEND:20160406T193000Z
UID:event1557@bu.edu
URL:http://physics.bu.edu/internal/events/show/1557
SUMMARY:A SEARCH FOR BARYON NUMBER VIOLATION BY TWO UNITS AT THE SUPER-KAMI
	OKANDE DETECTOR
DESCRIPTION:Featuring Jeffrey Gustafson\n\nPart of the PhD Final Oral Exams
	.\n\nDissertation Committee:\n\nEdward Kearns\, Robert Carey\, Tulika Bose\
	, Shyam Erramilli\, Andrew Cohen\n\n![Gustafson](/resources/event-image/155
	7/ac91941_original)\n\nAbstract:\n\nBaryon number appears to be a conserved
	 quantity in the Standard Model of particle physics\, though there are comp
	elling theoretical reasons to believe it isn't. This thesis describes searc
	hes for processes that violate baryon number by two units with the Super-Ka
	miokande experiment. Two types of searches are performed. One is the simult
	aneous decay of two bound nucleons to pions (dinucleon decay)\, encompassin
	g three different modes. The second is a search for a neutron transforming 
	into an antineutron\, or neutron-antineutron oscillation.\n\nThis thesis us
	es the full dataset across four Super-Kamiokande detector periods from Apri
	l 1996 to March 2015\, comprising 4972.4 livetime days (307 kiloton-years).
	 Monte Carlo simulations of the signal processes and their background from 
	atmospheric neutrino interactions are used to estimate signal efficiency\, 
	expected background\, and their associated uncertainties. Both multivariate
	 analyses and simple kinematical cuts are applied in these searches. This i
	s the first search for dinucleon decay to pions in oxygen. The search for n
	eutron-antineutron oscillation entails some important updates relative to a
	 previous search at Super-Kamiokande\, mainly increased exposure and an imp
	roved model of pion interactions.\n\nIn each mode investigated\, no signal 
	excess was observed\, and all data are consistent with atmospheric neutrino
	 background. In the absence of evidence for any signal process\, lower life
	times are set at the 90% confidence level. For dinucleon decay\, these lowe
	r lifetimes are about two orders of magnitude more stringent than in a prev
	ious search in iron\, while for neutron-antineutron oscillation the lower l
	ifetime is comparable to previous searches.
LOCATION:PRB 261\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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