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Title: Stellar collapse dynamics with neutrino flavor changing neutral currents

Abstract

We perform one-zone simulations of the infall epoch of a presupernova stellar core in the presence of neutrino flavor changing scattering interactions. Our calculations give a self-consistent assessment of the relationship between flavor changing rates and the reduction in electron fraction and redistribution of initial electron lepton number among the neutrino flavors. We discuss and include in our calculations subnuclear density medium corrections for flavor changing scattering coherence factors. We find that flavor changing couplings {epsilon}>3x10{sup -4} in either the {nu}{sub e}{r_reversible}{nu}{sub {mu}} or {nu}{sub e}{r_reversible}{nu}{sub {tau}} channels result in a dynamically significant reduction in the core electron fraction relatively soon after neutrino trapping and well before the core reaches nuclear matter density.

Authors:
;  [1]
  1. Department of Physics, University of California, San Diego, La Jolla, California 92093-0319 (United States)
Publication Date:
OSTI Identifier:
21020342
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 8; Other Information: DOI: 10.1103/PhysRevD.75.083008; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CORRECTIONS; COUPLING; ELECTRONS; FLAVOR MODEL; LEPTON NUMBER; NEUTRAL CURRENTS; NEUTRINOS; NUCLEAR MATTER; SCATTERING

Citation Formats

Amanik, Philip S., and Fuller, George M. Stellar collapse dynamics with neutrino flavor changing neutral currents. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.083008.
Amanik, Philip S., & Fuller, George M. Stellar collapse dynamics with neutrino flavor changing neutral currents. United States. doi:10.1103/PHYSREVD.75.083008.
Amanik, Philip S., and Fuller, George M. Sun . "Stellar collapse dynamics with neutrino flavor changing neutral currents". United States. doi:10.1103/PHYSREVD.75.083008.
@article{osti_21020342,
title = {Stellar collapse dynamics with neutrino flavor changing neutral currents},
author = {Amanik, Philip S. and Fuller, George M.},
abstractNote = {We perform one-zone simulations of the infall epoch of a presupernova stellar core in the presence of neutrino flavor changing scattering interactions. Our calculations give a self-consistent assessment of the relationship between flavor changing rates and the reduction in electron fraction and redistribution of initial electron lepton number among the neutrino flavors. We discuss and include in our calculations subnuclear density medium corrections for flavor changing scattering coherence factors. We find that flavor changing couplings {epsilon}>3x10{sup -4} in either the {nu}{sub e}{r_reversible}{nu}{sub {mu}} or {nu}{sub e}{r_reversible}{nu}{sub {tau}} channels result in a dynamically significant reduction in the core electron fraction relatively soon after neutrino trapping and well before the core reaches nuclear matter density.},
doi = {10.1103/PHYSREVD.75.083008},
journal = {Physical Review. D, Particles Fields},
number = 8,
volume = 75,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}
  • Flavor changing neutral current interactions are predicted in some extensions of the Standard Model. We discuss a process by which a neutrino can change flavor by scattering with a quark. We show how the stellar collapse environment is sensitive to neutrino flavor changing scattering on heavy nuclei. In particular, when this interaction is included in the stellar collapse model, the dynamics of the core's evolution and outcome of collapse are drastically changed.
  • The general form of the neutral currents satisfying ''natural'' conservation of strangeness is considered for the general class of SU(2) x U(1) gauge models and is tested against the existing data on elastic ..nu..p and nu-barp scattering. The existence of charm-changing neutral currents seems to be a possibility. In addition, we predict the ratio of the charged-current ..nu.. and nu-bar cross sections R/sub CC/ = sigma/sub nu-bar..nu../ to be less than about 0.8 at high energies.
  • From a measurement of the absolute cross section in {nu}{sub {ital e}e}{sup {minus}} elastic scattering we have set a limit on flavor-changing neutral currents in the neutrino sector. We find that an off-diagonal, flavor-changing coupling is limited to 1{minus}{ital f}{sub {ital e}{ital e}}{lt}0.35 (90% C.L.).
  • Consequences of a specific class of two Higgs doublet models in which the Higgs induced tree level flavor changing neutral currents (FCNC) display minimal flavor violation are considered. These FCNC are fixed in terms of the Cabibbo Kobayashi Maskawa (CKM) matrix elements and the down quark masses. The minimal model in this category with only two Higgs doublets has no extra CP violating phases, but such a phase can be induced by adding a complex singlet Higgs. The FCNC contribute significantly to B meson mixing and CP violation, but similar contributions in case of the K mesons are suppressed. Detailedmore » numerical analysis to determine the allowed Higgs contributions to neutral meson mixings and the CKM parameters {rho}, {eta} in their presence is presented. The Higgs induced phase in the B{sub d,s}{sup 0}-B{sub d,s}{sup 0} transition amplitude M{sub 12}{sup d,s} is predicted to be equal for the B{sub d} and the B{sub s} systems. There is a strong correlation between |V{sub ub}| and phases {phi}{sub d,s} in M{sub 12}{sup d,s}. A measurable CP violating phase {phi}{sub s}=-0.18{+-}0.08 is predicted on the basis of the observed phase {phi}{sub d} in the B{sub d} system if |V{sub ub}| is large and close to its value determined from the inclusive b decays.« less
  • No abstract prepared.