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SUMMARY:Ruling out four-neutrino oscillation interpretations of the LSND a
 nomaly?
DTSTART;VALUE=DATE-TIME:20021205T150000Z
DTEND;VALUE=DATE-TIME:20021205T160000Z
DTSTAMP;VALUE=DATE-TIME:20261110T141426Z
UID:indico-event-1291@indico.ific.uv.es
DESCRIPTION:Prompted by recent solar and atmospheric data\, we re-analyze 
 the four-neutrino description of current global neutrino oscillation data\
 , including the LSND evidence for oscillations. The higher degree of rejec
 tion for non-active solar and atmospheric oscillation solutions implied by
  the SNO neutral current result as well as by the latest 1489-day Super-K 
 atmospheric neutrino data allows us to rule out (2+2) oscillation schemes 
 proposed to reconcile LSND with the rest of current neutrino oscillation d
 ata. Using an improved goodness of fit (gof) method especially sensitive t
 o the combination of data sets we obtain a gof of only 1.6 times 10^{-6} f
 or (2+2) schemes. Further\, we re-evaluate the status of (3+1) oscillation
 s using two different analyses of the LSND data sample. We find that also 
 (3+1) schemes are strongly disfavoured by the data. Depending on the LSND 
 analysis we obtain a gof of 5.6 times 10^{-3} or 7.6 times 10^{-5}. This l
 eads to the conclusion that all four-neutrino descriptions of the LSND ano
 maly\, both in (2+2) as well as (3+1) realizations\, are highly disfavoure
 d. Our analysis brings the LSND hint to a more puzzling status.\n\nhttps:/
 /indico.ific.uv.es/event/1291/
LOCATION:Edf. Institutos de Investigación Sala Seminarios IFIC
URL:https://indico.ific.uv.es/event/1291/
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