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Title: Constraints on flavor-dependent long range forces from solar neutrinos and KamLAND

Abstract

Flavor-dependent long range (LR) leptonic forces, like those mediated by the L{sub e}-L{sub {mu}} or L{sub e}-L{sub {tau}} gauge bosons, constitute a minimal extension of the standard model that preserves its renormalizability. We study the impact of such interactions on the solar neutrino oscillations when the interaction range R{sub LR} is much larger than the Earth-Sun distance. The LR potential can dominate over the standard charged current potential inside the Sun in spite of strong constraints on the coupling {alpha} of the LR force coming from the atmospheric neutrino data and laboratory search for new forces. We demonstrate that the solar and atmospheric neutrino mass scales do not get trivially decoupled even if {theta}{sub 13} is vanishingly small. In addition, for {alpha} > or approx. 10{sup -52} and normal hierarchy, resonant enhancement of {theta}{sub 13} results in nontrivial energy dependent effects on the {nu}{sub e} survival probability. We perform a complete three generation analysis, and obtain constraints on {alpha} through a global fit to the solar neutrino and KamLAND data. We get the 3{sigma} limits {alpha}{sub e{mu}}<3.4x10{sup -53} and {alpha}{sub e{tau}}<2.5x10{sup -53} when R{sub LR} is much smaller than our distance from the galactic center. With larger R{sub LR}, themore » collective LR potential due to all the electrons in the galaxy becomes significant and the constraints on {alpha} become stronger by up to two orders of magnitude.« less

Authors:
;  [1];  [2]
  1. Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005 (India)
  2. Physical Research Laboratory, Ahmedabad 380 009 (India)
Publication Date:
OSTI Identifier:
21020469
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.75.093005; (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; BOSONS; CHARGED CURRENTS; COUPLING; ELECTRON NEUTRINOS; ELECTRONS; ENERGY DEPENDENCE; INTERACTION RANGE; MATRIX ELEMENTS; NEUTRINO OSCILLATION; POTENTIALS; REST MASS; SOLAR NEUTRINOS; STANDARD MODEL; SUN

Citation Formats

Bandyopadhyay, Abhijit, Dighe, Amol, and Joshipura, Anjan S. Constraints on flavor-dependent long range forces from solar neutrinos and KamLAND. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.093005.
Bandyopadhyay, Abhijit, Dighe, Amol, & Joshipura, Anjan S. Constraints on flavor-dependent long range forces from solar neutrinos and KamLAND. United States. doi:10.1103/PHYSREVD.75.093005.
Bandyopadhyay, Abhijit, Dighe, Amol, and Joshipura, Anjan S. Tue . "Constraints on flavor-dependent long range forces from solar neutrinos and KamLAND". United States. doi:10.1103/PHYSREVD.75.093005.
@article{osti_21020469,
title = {Constraints on flavor-dependent long range forces from solar neutrinos and KamLAND},
author = {Bandyopadhyay, Abhijit and Dighe, Amol and Joshipura, Anjan S.},
abstractNote = {Flavor-dependent long range (LR) leptonic forces, like those mediated by the L{sub e}-L{sub {mu}} or L{sub e}-L{sub {tau}} gauge bosons, constitute a minimal extension of the standard model that preserves its renormalizability. We study the impact of such interactions on the solar neutrino oscillations when the interaction range R{sub LR} is much larger than the Earth-Sun distance. The LR potential can dominate over the standard charged current potential inside the Sun in spite of strong constraints on the coupling {alpha} of the LR force coming from the atmospheric neutrino data and laboratory search for new forces. We demonstrate that the solar and atmospheric neutrino mass scales do not get trivially decoupled even if {theta}{sub 13} is vanishingly small. In addition, for {alpha} > or approx. 10{sup -52} and normal hierarchy, resonant enhancement of {theta}{sub 13} results in nontrivial energy dependent effects on the {nu}{sub e} survival probability. We perform a complete three generation analysis, and obtain constraints on {alpha} through a global fit to the solar neutrino and KamLAND data. We get the 3{sigma} limits {alpha}{sub e{mu}}<3.4x10{sup -53} and {alpha}{sub e{tau}}<2.5x10{sup -53} when R{sub LR} is much smaller than our distance from the galactic center. With larger R{sub LR}, the collective LR potential due to all the electrons in the galaxy becomes significant and the constraints on {alpha} become stronger by up to two orders of magnitude.},
doi = {10.1103/PHYSREVD.75.093005},
journal = {Physical Review. D, Particles Fields},
number = 9,
volume = 75,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}
  • We have investigated the impact of long-range forces induced by unparticle operators of scalar, vector and tensor nature coupled to fermions in the interpretation of solar neutrinos and KamLAND data. If the unparticle couplings to the neutrinos are mildly non-universal, such long-range forces will not factorize out in the neutrino flavour evolution. As a consequence large deviations from the observed standard matter-induced oscillation pattern for solar neutrinos would be generated. In this case, severe limits can be set on the infrared fixed point scale, {Lambda}{sub u}, and the new physics scale, M, as a function of the ultraviolet (d{sub UV})more » and anomalous (d) dimension of the unparticle operator. For a scalar unparticle, for instance, assuming the non-universality of the lepton couplings to unparticles to be of the order of a few per mil we find that, for d{sub UV} = 3 and d = 1.1, M is constrained to be M>O(10{sup 9}) TeV (M>O(10{sup 10}) TeV) if {Lambda}{sub u} = 1 TeV (10 TeV). For given values of {Lambda}{sub u} and d, the corresponding bounds on M for vector (tensor) unparticles are {approx}100 ({approx}3/{radical}({Lambda}{sub u}/TeV)) times those for the scalar case. Conversely, these results can be translated into severe constraints on universality violation of the fermion couplings to unparticle operators with scales which can be accessible at future colliders.« less
  • We present new constraints on the neutrino oscillation parameters {Delta}m{sub 21}{sup 2}, {theta}{sub 12}, and {theta}{sub 13} from a three-flavor analysis of solar and KamLAND data. The KamLAND data set includes data acquired following a radiopurity upgrade and amounts to a total exposure of 3.49 x 10{sup 32} target-proton-year. Under the assumption of CPT invariance, a two-flavor analysis ({theta}{sub 13} = 0) of the KamLAND and solar data yields the best-fit values tan{sup 2} {theta}{sub 12} = 0.444{sub -0.030}{sup +0.036} and {Delta}m{sub 21}{sup 2} = 7.50{sub -0.20}{sup +0.19} x 10{sup -5} eV{sup 2}; a three-flavor analysis with {theta}{sub 13} asmore » a free parameter yields the best-fit values tan{sup 2} {theta}{sub 12} = 0.452{sub -0.033}{sup +0.035}, {Delta}m{sub 21}{sup 2} = 7.50{sub -0.20}{sup +0.19} x 10{sup -5}eV{sup 2}, and sin{sup 2} {theta}{sub 13} = 0.020{sub -0.016}{sup +0.016}. This {theta}{sub 13} interval is consistent with other recent work combining the CHOOZ, atmospheric and long-baseline accelerator experiments. We also present a new global {theta}{sub 13} analysis, incorporating the CHOOZ, atmospheric and accelerator data, which indicates sin{sup 2} {theta}{sub 13} = 0.017{sub -0.009}{sup +0.010}, a nonzero value at the 93% C.L. This finding will be further tested by upcoming accelerator and reactor experiments.« less
  • We present new constraints on the neutrino oscillation parameters {Delta}m{sub 21}{sup 2}, {theta}{sub 12}, and {theta}{sub 13} from a three-flavor analysis of solar and KamLAND data. The KamLAND data set includes data acquired following a radiopurity upgrade and amounts to a total exposure of 3.49x10{sup 32} target-proton-year. Under the assumption of CPT invariance, a two-flavor analysis ({theta}{sub 13}=0) of the KamLAND and solar data yields the best-fit values tan{sup 2}{theta}{sub 12}=0.444{sub -0.030}{sup +0.036} and {Delta}m{sub 21}{sup 2}=7.50{sub -0.20}{sup +0.19}x10{sup -5} eV{sup 2}; a three-flavor analysis with {theta}{sub 13} as a free parameter yields the best-fit values tan{sup 2}{theta}{sub 12}=0.452{sub -0.033}{supmore » +0.035}, {Delta}m{sub 21}{sup 2}=7.50{sub -0.20}{sup +0.19}x10{sup -5} eV{sup 2}, and sin{sup 2}{theta}{sub 13}=0.020{sub -0.016}{sup +0.016}. This {theta}{sub 13} interval is consistent with other recent work combining the CHOOZ, atmospheric and long-baseline accelerator experiments. We also present a new global {theta}{sub 13} analysis, incorporating the CHOOZ, atmospheric, and accelerator data, which indicates sin{sup 2}{theta}{sub 13}=0.009{sub -0.007}{sup +0.013}. A nonzero value is suggested, but only at the 79% C.L.« less
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