Types and Models of Neutrinos| Types and Models of Neutrinos |
In General
> s.a. mixing and oscillations; neutrinos
[interactions]; dirac fields; kerr spacetime;
Singletons.
* e-neutrinos:
1986, Bethe estimates m = 2 × 10−7 eV,
based on oscillations; Bahcall & Glashow give m < 9.5 eV from SN 1987A data;
2002, 3H decay experiments give m < 2.2 eV;
2003, m < 0.6 eV, 95% cl, from SDSS data; WMAP gives m < 0.7 eV.
* μ-neutrinos: 1986, Bethe
estimates m = 0.01 eV, from oscillations; 1995, m < 160 KeV, 95%,
from particle decay rates; 2002, 2dF results on galaxy distribution power spectrum imply
me + mμ
+ mτ < 2.2 eV.
* τ-neutrinos: 1978, Theorized by
M Perl; 2000, Direct evidence at Fermilab; 1995, m < 29 MeV, 95%, from decay rates.
* Geoneutrinos: The Earth emits
about 1025 geoneutrinos per second, roughly
a trillionth of the solar neutrinos, from radioactive decays in the mantle and crust.
@ Number of species: Herbut a1211
[massive Majorana chiral neutrinos, time reversal symmetry, and the dimension of space];
news cosmos(18)sep [evidence for a fourth type?];
> s.a. cosmological neutrinos.
@ Dirac vs Majorana:
Gutierrez PRL(06) [experiment proposal];
Singh et al PRL(06)gq,
gq/06,
comment Nieves & Pal PRL(07)gq/06,
reply PRL(07)gq/06 [gravity coupling];
Dvoeglazov a1108-conf [chirality and helicity];
Ackerman et al PRL(11) [improved understanding of two-neutrino double-beta decay];
Alavi & Abbasnezhad G&C(16)-a1201 [and interaction with gravity];
news lbl(12)may [MAJORANA DEMONSTRATOR experiment];
Dib & Kim PRD(15) [and W boson decays];
Romero MPLA(16)-a1605 [argument for Majorana].
@ 17 keV neutrinos: news PT(91)may,
PT(93)apr;
Franklin RMP(95) [consensus is that it is not there];
Wietfeldt & Norman PRP(96).
@ Atmospheric neutrinos: Plyaskin PLB(01);
Gaisser PS(05)ap [rev];
Stanev NPPS(05);
González-García et al PRL(08)-a0711
+ news pw(07)nov [as probes of Earth interior];
Gaisser JPCS(16)-a1605 [rev];
LoSecco PiP(16)-a1606 [history].
@ Geoneutrinos: news
pi(10)jul [search];
focus Phy(15)
[neutrinos from Earth's mantle detected by Borexino];
Agostini et Borexino PRD(20).
@ Related topics: Barger et al PLB(11)-a1010 [models with 3 layers of neutrinos];
McDonough et al PT(12)mar
[uses of anti-νes];
Sidharth IJTP(13) [model].
Sterile Neutrinos
* Idea: Hypothetical particles
with keV masses, which interact only gravitationally and decay over a very long time,
much longer than the Hubble time; The motivation is that three neutrinos don't seem
to explain all oscillation (atmospheric, solar, accelerator) data; However, there are
Super-Kamiokande indications that νμ
→ ντ exclusively, and not
into sterile ones.
* Status: 2007, MiniBooNE results
provide evidence for only three light neutrinos and make sterile neutrinos unlikely
[@ news pn(07)apr];
2011, New experiments have revealed evidence that sterile neutrinos are not only real
but common, and a possible component of dark matter.
@ General references:
Patel & Fuller hp/00-proc;
Fukuda et al PRL(00);
Volkas PPNP(02);
Kusenko AIP(07)hp,
PRP(09) [rev];
Chan & Chu ApJL(11)-a1009 [near the galactic center];
Giunti a1110-conf [phenomenology];
Nicolaidis MPLA(12) [resonance between flavor and sterile neutrino with large extra dimensions];
Kang IJMPA(19)-a1904 [in particle physics and cosmology].
@ Tests, experimental searches: news SA(11)jan;
news PhysOrg(11)nov [proposed test];
news pw(13)jun [upcoming thorough search at Gran Sasso];
An et al PRL(14) [stringent limits from search at Daya Bay];
Lindner et al JHEP(16)-a1510 [in the light of IceCube];
Schmitz Phy(16),
news nat(16)aug,
pt(16)aug [IceCube finds no evidence];
news pt(18)jun [evidence from neutrino oscillations?];
news cosmos(18)nov [hints?];
news Phys(20) [stringent constraints].
@ And cosmology: Dodelson et al PRL(06);
Joudaki et al PRD(13)-a1208;
Bergström et al JHEP(14)-a1407 [tests];
Vincent et al JCAP(15)-a1408 [bounds];
Leistedt et al PRL(14) [sterile neutrinos do not reduce the discrepancy between cosmological data sets];
Gariazzo a1601-proc;
> s.a. dark-matter types.
Superluminal Neutrinos? > s.a. particle
physics and types of particles.
@ Theory: Giannetto et al PLB(86);
Magueijo a1109 [and neutrino oscillations];
Contaldi a1109 [clock synchronisation issue?];
Hannestad & Sloth a1109 [sterile neutrinos in higher dimensions?];
Alexandre et al PLB(12)-a1109 [models];
Kehagias a1109 [local effect caused by a scalar field];
Cohen & Glashow PRL(11)-a1109 [electron-positron pair bremsstrahlung issue];
Giudice et al NPB(12) [interpretation and conflict];
Berry et al JPA(11)-a1110 [quantum weak measurement? probably not];
Altaie a1111 [torsion];
Amelino-Camelia et al IJMPD(11),
MPLA(12);
Santos a1201 [metric fluctuations];
Kirillov & Savelova a1204 [wormhole-like object?];
Hebecker & Knochel PLB(12) [constraints, difficulties];
Fujii IJGMP(13) [rev];
> s.a. finsler geometry; majorana spinors.
@ Experiment: OPERA, Adam et al JHEP(12)-a1109
+ news cern(11)sep,
sn(11)sep,
bbc(11)sep,
comment Close guardian(11)sep;
Delmastro blog(11)sep;
Drago et al EPL(12)-a1109;
comments sa(11)sep;
Henri a1110 [varying beam composition];
Mecozzi & Bellini a1110 [group velocity];
news pw(11)oct [differing opinions within OPERA];
pt(11)oct [reaction of the press];
van Elburg a1110
+ tr(11)oct [relativistic motion of GPS clocks];
Icarus Collab PLB(12)-a1110
+ news pw(11)oct [no electron-positron pairs];
Davoudiasl & Rizzo PRD(11)-a1110 [LHC tests];
Cowsik et al PRL(11) [and pion decay];
Bel a1112 [OPERA and the GPS];
news sn(11)dec [conservation of energy and momentum];
news nat(12)feb,
sci(12)feb,
pt(12)feb,
ns(12)feb [loose fiber-optic cable?];
Antonello et al PLB(12)-a1203
+ news bbc(12)mar [no longer superluminal in new experiment];
news nat(12)apr [project leaders step down];
news csm(12)jun [new results all consistent with the speed of light];
Zichichi IJMPA(12).
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send feedback and suggestions to bombelli at olemiss.edu – modified 16 feb 2021