Probing nonstandard neutrino interactions with supernova neutrinos

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A. Esteban-Pretel, R. Tomàs, and J. W. F. Valle
AHEP Group, Institut de Física Corpuscular, C.S.I.C/Universitat de València, Edifici Instituts d'Investigació, Apt. 22085, E-46071 València, Spain

Received 10 April 2007; revised 19 June 2007; published 10 September 2007

Weanalyze the possibility of probing nonstandard neutrino interactions (NSI, forshort) through the detection of neutrinos produced in a futuregalactic supernova (SN). We consider the effect of NSI onthe neutrino propagation through the SN envelope within a three-neutrinoframework, paying special attention to the inclusion of NSI-induced resonantconversions, which may take place in the most deleptonized innerlayers. We study the possibility of detecting NSI effects ina Megaton water Cherenkov detector, either through modulation effects inthe [overline nu ]_e spectrum due to (i) the passage of shock wavesthrough the SN envelope, (ii) the time dependence of the electronfraction, and (iii) the Earth matter effects; or, finally, through thepossible detectability of the neutronization nu_e burst. We find thatthe [overline nu ]_e spectrum can exhibit dramatic features due to theinternal NSI-induced resonant conversion. This occurs for nonuniversal NSI strengthsof a few %, and for very small flavor-changing NSI abovea few×10^-5.

URL:	http://link.aps.org/doi/10.1103/PhysRevD.76.053001
DOI:	10.1103/PhysRevD.76.053001
PACS:	13.15.+g; 14.60.Lm; 14.60.St; 97.60.Bw 13.15.+g Neutrino interactions 14.60.Lm Ordinary neutrinos (nu_e, nu_µ, nu_tau) 14.60.St Non-standard-model neutrinos, right-handed neutrinos, etc. 97.60.Bw Supernovae YEAR: 2007

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