Strength of the antineutrino-proton neutral-current interaction

1978 ◽  
Vol 18 (1) ◽  
pp. 7-15 ◽  
Author(s):  
M. Derrick ◽  
P. Gregory ◽  
L. G. Hyman ◽  
K. Jaeger ◽  
D. Lissauer ◽  
...  
Keyword(s):  
Neutral Current ◽  
Current Interaction

RESULTS FROM THE PURE D2O PHASE OF THE SUDBURY NEUTRINO OBSERVATORY

2003 ◽  
Vol 18 (22) ◽  
pp. 3789-3807
Author(s):  
◽  
F. A. DUNCAN
Keyword(s):  
Neutral Current ◽  
Solar Neutrinos ◽  
Total Flux ◽  
Sudbury Neutrino Observatory ◽  
Charged Current ◽  
Mixing Angle ◽  
Cerenkov Detector ◽  
Neutrino Spectrum ◽  
Oscillation Analysis ◽  
Current Interaction

The Sudbury Neutrino Observatory is a 1000 T D2O Cerenkov detector that is sensitive to 8 B and hep solar neutrinos. Both Charged Current and Neutral Current interaction rates on deuterons as well as the Elastic Scattering interaction rate on electrons can be measured simultaneously. Assuming an undistorted 8 B neutrino spectrum, the total flux measured with the NC reaction is [Formula: see text], which is consistent with solar models. The νe component of the 8 B solar flux is [Formula: see text] for a kinetic energy threshold of 5 MeV. The non-νe component is [Formula: see text], which is 5.3σ greater than zero, giving strong evidence for solar νe flavor transformation. The Day-Night Asymmetry for the Charged Current interaction is [Formula: see text]. If the total flux of active neutrinos is additionally constrained to have no asymmetry, the νe asymmetry is found to be [Formula: see text]. Combined with other solar neutrino data, a global MSW oscillation analysis strongly favors the Large Mixing Angle (LMA) solution.

NEUTRINO OSCILLATION IN DENSE MEDIUMS

2009 ◽  
Vol 24 (18n19) ◽  
pp. 3483-3492 ◽  
Author(s):  
Z. Y. LAW ◽  
A. H. CHAN ◽  
C. H. OH
Keyword(s):  
Neutrino Oscillation ◽  
Standard Treatment ◽  
Neutral Current ◽  
Matter Density ◽  
Order Equation ◽  
Second Order ◽  
Dense Medium ◽  
First Order ◽  
Probability Current ◽  
Current Interaction

It is found that a term normally discarded in the standard treatment of the MSW effect might be relevant in the case of non-adiabatic varying matter density, leading to a second order field equation, instead of the usual first order "Schrodinger equation". This leads to dispersion relation that gives rise to the possibility of neutrino trapping in a dense medium as well as the coupling of neutrino oscillation to neutral current interaction. This is found to be in agreement with previous results1. The corresponding conserved probability current is derived for this second order equation, and applied to the case of 2-flavor neutrino oscillation in a dense medium. The results in this work might be applicable to the oscillation of neutrinos in dense astrophysical medium.

scholarly journals Analysis of the neutral-current interaction in the inclusive neutrino reaction

Pramana ◽  
1974 ◽  
Vol 2 (6) ◽  
pp. x-x
Author(s):  
G Rajasekaran ◽  
K V L Sarma
Keyword(s):  
Neutral Current ◽  
Neutrino Reaction ◽  
Current Interaction

scholarly journals Reading the footprints of the B-meson flavor anomalies

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
Claudia Cornella ◽  
Darius A. Faroughy ◽  
Javier Fuentes-Martín ◽  
Gino Isidori ◽  
Matthias Neubert
Keyword(s):  
B Meson ◽  
Neutral Current ◽  
Effective Field ◽  
Flavor Symmetry ◽  
Theory Approach ◽  
Decay Modes ◽  
Lepton Flavor ◽  
Complete Extension ◽  
Left Handed ◽  
Current Interaction

Abstract Motivated by the recent LHCb announcement of a 3.1σ violation of lepton- flavor universality in the ratio RK = Γ(B → Kμ+μ−)/Γ(B → Ke+e−), we present an updated, comprehensive analysis of the flavor anomalies seen in both neutral-current (b → sℓ+ℓ−) and charged-current (b → $$ c\tau \overline{\nu} $$ cτ ν ¯ ) decays of B mesons. Our study starts from a model-independent effective field-theory approach and then considers both a simplified model and a UV-complete extension of the Standard Model featuring a vector leptoquark U1 as the main mediator of the anomalies. We show that the new LHCb data corroborate the emerging pattern of a new, predominantly left-handed, semileptonic current-current interaction with a flavor structure respecting a (minimally) broken U(2)5 flavor symmetry. New aspects of our analysis include a combined analysis of the semileptonic operators involving tau leptons, including in particular the important constraint from Bs-$$ {\overline{B}}_s $$ B ¯ s mixing, a systematic study of the effects of right-handed leptoquark couplings and of deviations from minimal flavor-symmetry breaking, a detailed analysis of various rare B-decay modes which would provide smoking-gun signatures of this non-standard framework (LFV decays, di-tau modes, and B → K(*)$$ \nu \overline{\nu} $$ ν ν ¯ ), and finally an updated analysis of collider bounds on the leptoquark mass and couplings.

Sign in / Sign up

Export Citation Format

Share Document