scholarly journals Tests of the standard model and constraints on new physics from measurements of fermion-pair production at 130–172 GeV at LEP

1998 ◽  
Vol 2 (3) ◽  
pp. 441 ◽  
Author(s):  
K. Ackerstaff et al.
Keyword(s):  
Standard Model ◽  
Pair Production ◽  
New Physics ◽  
Fermion Pair ◽  
The Standard Model

scholarly journals Fermion pair production in e+e- collisions at 189–209 GeV and constraints on physics beyond the standard model

2006 ◽  
Vol 49 (2) ◽  
pp. 411-437 ◽  
Author(s):  
S. Schael ◽  
◽  
R. Barate ◽  
R. Brunelière ◽  
I. De Bonis ◽  
...  
Keyword(s):  
Standard Model ◽  
Pair Production ◽  
Beyond The Standard Model ◽  
Fermion Pair ◽  
The Standard Model

Towards a Precision Measurement of the Muon Pair Asymmetry in e+e− Annihilation at Belle and Belle II

2016 ◽  
Vol 40 ◽  
pp. 1660078
Author(s):  
Torben Ferber
Keyword(s):  
Standard Model ◽  
Precision Measurement ◽  
New Physics ◽  
Interference Effects ◽  
Muon Pair ◽  
Fermion Pair ◽  
Boson Exchange ◽  
The Standard Model ◽  
Belle Ii ◽  
Energy Dependent

The Standard Model predicts interference effects between [Formula: see text] and [Formula: see text] boson exchange in fermion pair production which cause a forward–backward asymmetry [Formula: see text] even for energies well below the [Formula: see text]–pole. This energy–dependent asymmetry ([Formula: see text] at 10.58[Formula: see text]GeV) is proportional to the SM [Formula: see text] parameter and can be measured at the Belle and Belle[Formula: see text]II experiments. The sensitivity to New Physics as well as theoretical and experimental challenges are described.

scholarly journals Standard Model prediction of the Bc lifetime

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Jason Aebischer ◽  
Benjamín Grinstein
Keyword(s):  
Standard Model ◽  
Model Prediction ◽  
Strange Quark ◽  
Standard Model Prediction ◽  
New Physics ◽  
Operator Product ◽  
Special Focus ◽  
Third Order ◽  
Clear Cut ◽  
The Standard Model

Abstract Applying an operator product expansion approach we update the Standard Model prediction of the Bc lifetime from over 20 years ago. The non-perturbative velocity expansion is carried out up to third order in the relative velocity of the heavy quarks. The scheme dependence is studied using three different mass schemes for the $$ \overline{b} $$ b ¯ and c quarks, resulting in three different values consistent with each other and with experiment. Special focus has been laid on renormalon cancellation in the computation. Uncertainties resulting from scale dependence, neglecting the strange quark mass, non-perturbative matrix elements and parametric uncertainties are discussed in detail. The resulting uncertainties are still rather large compared to the experimental ones, and therefore do not allow for clear-cut conclusions concerning New Physics effects in the Bc decay.

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