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SUMMARY:Non-standard neutrino oscillations: perspective from unitarity tri
angles
DTSTART;VALUE=DATE-TIME:20210830T152500Z
DTEND;VALUE=DATE-TIME:20210830T154000Z
DTSTAMP;VALUE=DATE-TIME:20241010T150227Z
UID:indico-contribution-15531@indico.ific.uv.es
DESCRIPTION:Speakers: Poonam Mehta (Jawaharlal Nehru University)\nWe formu
late an alternative approach based on unitarity triangles to describe neut
rino oscillations in presence of non-standard interactions (NSI). Using pe
rturbation theory\, we derive the expression for the oscillation probabili
ty in case of NSI and cast it in terms of the three independent parameters
of the leptonic unitarity triangle (LUT). The form invariance of the prob
ability expression (even in presence of new physics scenario as long as th
e mixing matrix is unitary) facilitates a neat geometric view of neutrino
oscillations in terms of LUT. We examine the regime of validity of perturb
ative expansions in the NSI case and make comparisons with approximate exp
ressions existing in literature. We uncover some interesting dependencies
on NSI terms while studying the evolution of LUT parameters and the Jarlsk
og invariant. Interestingly\, the geometric approach based on LUT allows u
s to express the oscillation probabilities for a given pair of neutrino fl
avours in terms of only three (and not four) degrees of freedom which are
related to the geometric properties (sides and angles) of the triangle. Mo
reover\, the LUT parameters are invariant under rephasing transformations
and independent of the parameterization adopted.\n\nhttps://indico.ific.uv
.es/event/6178/contributions/15531/
LOCATION:
URL:https://indico.ific.uv.es/event/6178/contributions/15531/
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