scholarly journals Precision measurements of the neutral current from hadron and lepton production at LEP

1993 ◽  
Vol 58 (2) ◽  
pp. 219-237 ◽  
Author(s):  
◽  
P. D. Acton ◽  
G. Alexander ◽  
J. Allison ◽  
P. P. Allport ◽  
...  
Keyword(s):  
Neutral Current ◽  
Precision Measurements ◽  
Lepton Production

scholarly journals Improved measurements of the neutral current from hadron and lepton production at LEP

1994 ◽  
Vol 61 (1) ◽  
pp. 19-34 ◽  
Author(s):  
◽  
R. Akers ◽  
G. Alexander ◽  
J. Allison ◽  
K. J. Anderson ◽  
...  
Keyword(s):  
Neutral Current ◽  
Lepton Production

scholarly journals Neutrino-nucleus cross-sections at supernova neutrino energies

2017 ◽  
Vol 26 (07) ◽  
pp. 1750047 ◽  
Author(s):  
S. Chauhan ◽  
M. Sajjad Athar ◽  
S. K. Singh
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Local Density ◽  
Neutral Current ◽  
Reaction Cross ◽  
Lepton Production ◽  
Cross Section Formula ◽  
Supernova Neutrino ◽  
Charged Leptons ◽  
Coulomb Distortion

The inclusive neutrino/antineutrino-induced charged and neutral current reaction cross-sections in [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] in the energy region of supernova neutrinos/antineutrinos are studied. The calculations are performed in the local density approximation (LDA) taking into account the effects due to Pauli blocking, Fermi motion and the renormalization of weak transition strengths in the nuclear medium. The effect of Coulomb distortion of the lepton produced in the charged current reactions has also been included. The numerical results for the energy dependence of the cross-section [Formula: see text] as well as the flux averaged cross-section and event rates for the charged lepton production in the case of some supernova neutrino/antineutrino fluxes recently discussed in the literature have been presented. We have also given the flux-averaged angular and energy distributions of the charged leptons corresponding to these fluxes.

scholarly journals Four lepton production and the accuracy of QED FSR

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
Christian Gütschow ◽  
Marek Schönherr
Keyword(s):  
Charged Lepton ◽  
Percent Level ◽  
Precision Measurements ◽  
Order Effects ◽  
Leading Order ◽  
Final State ◽  
Lepton Production ◽  
Fixed Order ◽  
Higher Order Effects ◽  
Identification Strategy

AbstractWe scrutinise the ability of the primary QED final-state resummation tools, combined with electroweak virtual corrections, to reproduce the exact next-to-leading order electroweak calculation in the four-charged-lepton final state. We further examine the dependence of the findings on the lepton-photon dressing-cone size as well as the resonance identification strategy. Overall we find excellent agreement with the fixed-order result, but partial differences not directly connected with resummation-induced higher-order effects at the few-percent level are observed in some cases, which are relevant for precision measurements.

scholarly journals Prospects for $\tau$ lepton physics at Belle II

2019 ◽  
Author(s):  
Michel Enrique Hernandez Villanueva
Keyword(s):  
Precision Measurements ◽  
Model Parameters ◽  
Lepton Production ◽  
Lepton Flavor ◽  
Belle Detector ◽  
Physics Program ◽  
Electron Positron ◽  
Belle Ii ◽  
Positron Collisions ◽  
Broad Program

The Belle II experiment is an upgrade of the Belle detector and will operate at the SuperKEKB energy-asymmetric e^+e^-e+e− collider. The accelerator has already successfully completed the first phase of commissioning and first electron positron-collisions in Belle II were observed in April 2018. The design luminosity of SuperKEKB is 8x10^{35}35 cm^{-2}−2s^{-1}−1 and the Belle II experiment aims to record 50 ab^{-1}−1 of data. Belle II has a broad program of \tauτ physics, in particular, precision measurements of Standard Model parameters and searches of lepton flavor and lepton number violations, benefiting from the large cross-section of the pairwise \tauτ lepton production in e^+e^-e+e− collisions. In this talk, we will review the \tauτ lepton physics program of Belle II.

scholarly journals Neutrino non-standard interactions meet precision measurements of Neff

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Yong Du ◽  
Jiang-Hao Yu
Keyword(s):  
Neutral Current ◽  
Percent Level ◽  
Coherent Scattering ◽  
Effective Field ◽  
Precision Measurements ◽  
Collision Term ◽  
Vector Type ◽  
Stringent Constraint ◽  
The Standard Model ◽  
Theory Framework

Abstract The number of relativistic species, Neff, has been precisely calculated in the standard model, and would be measured to the percent level by CMB-S4 in future. Neutral-current non-standard interactions would affect neutrino decoupling in the early Universe, thus modifying Neff. We parameterize those operators up to dimension-7 in the effective field theory framework, and then provide a complete, generic and analytical dictionary for the collision term integrals. From precision measurements of Neff, the most stringent constraint is obtained for the dimension-6 vector-type neutrino-electron operator, whose scale is constrained to be above about 195 (331) GeV from Planck (CMB-S4). We find our results complementary to other experiments like neutrino coherent scattering, neutrino oscillation, collider, and neutrino deep inelastic scattering experiments.

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