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SUMMARY:SN1987A constraints on the neutrino-dark-fermion interaction from 
 resonant scattering with C$\\nu$B
DTSTART;VALUE=DATE-TIME:20261025T073000Z
DTEND;VALUE=DATE-TIME:20261025T075000Z
DTSTAMP;VALUE=DATE-TIME:20261025T055156Z
UID:indico-contribution-3007@indico.itp.ac.cn
DESCRIPTION:Speakers: Rui Zou (Southern University of Science and Technolo
 gy)\nNeutrino self-interactions mediated by a light scalar offer a compell
 ing resolution to cosmological tensions and may naturally arise in neutrin
 o mass generation mechanisms. When the scalar also couples to a light dark
 -sector fermion\, supernova neutrinos can resonantly annihilate with the c
 osmic neutrino background (C$\\nu$B) into invisible dark radiation\, deple
 ting the flux en route to Earth. We use this depletion to constrain the ne
 utrino-scalar coupling from the SN1987A data. Within a Bayesian framework 
 we analyze the data for two supernova neutrino emission models\, a paramet
 erized model and a 2D hydrodynamic simulation\, and for two coupling types
 \, a mass-independent one and a mass-proportional one. Our results show th
 at new-physics limits from SN1987A cannot be quoted independently of the h
 eavy-flavor emission\, the flavor conversion\, or the coupling structure. 
 Finally\, we forecast that a future high-statistics burst recorded by Hype
 r-Kamiokande would restore a meaningful upper bound even when flavor conve
 rsion is included.\n\nhttps://indico.itp.ac.cn/event/427/contributions/300
 7/
LOCATION:
URL:https://indico.itp.ac.cn/event/427/contributions/3007/
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