Standard model calculations for precision observables beyond one loop

1998 ◽  
Vol 66 (1-3) ◽  
pp. 63-66
Author(s):  
B. Krause
Keyword(s):  
Standard Model ◽  
Model Calculations ◽  
Precision Observables

scholarly journals Analyses of Wolf-Rayet Spectra

1991 ◽  
Vol 143 ◽  
pp. 81-86
Author(s):  
W.-R. Hamann
Keyword(s):  
Quantitative Analysis ◽  
Standard Model ◽  
Emission Line ◽  
Massive Stars ◽  
Stellar Atmospheres ◽  
Model Calculations ◽  
Plane Parallel ◽  
Long Time ◽  
Effective Temperatures ◽  
Static Plane

Wolf-Rayet stars represent an important stage in the evolution of massive stars, but are only poorly understood so far. For a better knowledge one might determine their effective temperatures, luminosities and atmospheric compositions. But the emission-line dominated Wolf-Rayet spectra were not accessible to a quantitative analysis for a long time, because “standard” model calculations for static, plane-parallel stellar atmospheres are not adequate to that type of stars.

Regularization in low-energy standard model calculations

1990 ◽  
Vol 237 (2) ◽  
pp. 252-255 ◽  
Author(s):  
Robert Grigjanis ◽  
Patrick J. O'Donnell ◽  
Mark Sutherland ◽  
Henri Navelet
Keyword(s):  
Standard Model ◽  
Low Energy ◽  
Model Calculations

PRECISE TESTS OF e-μ UNIVERSALITY

1992 ◽  
Vol 07 (36) ◽  
pp. 3357-3364 ◽  
Author(s):  
TOSHIO NUMAO
Keyword(s):  
Standard Model ◽  
Weak Interactions ◽  
Branching Ratio ◽  
Experimental Tests ◽  
Model Calculations ◽  
The Status

The status of experimental tests of electron-muon universality in weak interactions is reviewed. The average of the new measurements of the π+→e+ν branching ratio, R ave =Γ(π→eν+π→eνγ)/Γ(π→μν+π→μνγ)=(1.2312±0.0037)×10−4, is consistent with standard model calculations R th =(1.234±0.001)×10−4 and confirms the hypothesis of electron-muon universality at the 0.2% level.

scholarly journals Theory requirements for SM Higgs and EW precision physics at the FCC-ee

2021 ◽  
Vol 136 (9) ◽  
Author(s):  
S. Heinemeyer ◽  
S. Jadach ◽  
J. Reuter
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
High Precision ◽  
Boson Mass ◽  
Experimental Measurements ◽  
Mixing Angle ◽  
The Standard Model ◽  
The Status ◽  
Precision Observables ◽  
Electroweak Precision

AbstractHigh-precision experimental measurements of the properties of the Higgs boson at $$\sim 125$$ ∼ 125  GeV as well as electroweak precision observables such as the W-boson mass or the effective weak leptonic mixing angle are expected at future $$e^+e^-$$ e + e - colliders such as the FCC-ee. This high anticipated precision has to be matched with theory predictions for the measured quantities at the same level of accuracy. We briefly summarize the status of these predictions within the standard model and of the tools that are used for their determination. We outline how the theory predictions will have to be improved in order to reach the required accuracy, and also comment on the simulation frameworks for the Higgs and EW precision program.

scholarly journals Global fits of third family hypercharge models to neutral current B-anomalies and electroweak precision observables

2021 ◽  
Vol 81 (8) ◽  
Author(s):  
B. C. Allanach ◽  
J. Eliel Camargo-Molina ◽  
Joe Davighi
Keyword(s):  
Standard Model ◽  
Neutral Current ◽  
Data Set ◽  
The Standard Model ◽  
Precision Observables ◽  
Electroweak Precision ◽  
Combined Data

AbstractWhile it is known that third family hypercharge models can explain the neutral current B-anomalies, it was hitherto unclear whether the $$Z-Z^\prime $$ Z - Z ′ mixing predicted by such models could simultaneously fit electroweak precision observables. Here, we perform global fits of several third family hypercharge models to a combination of electroweak data and those data pertinent to the neutral current B-anomalies. While the Standard Model is in tension with this combined data set with a p-value of .0007, simple versions of the models (fitting two additional parameters each) provide much improved fits. The original Third Family Hypercharge Model, for example, has a p-value of $${.065}$$ . 065 , with $$\sqrt{\Delta \chi ^2}=6.5\sigma $$ Δ χ 2 = 6.5 σ .

PHYSICS AT B-FACTORIES: TIME-DEPENDENT CP VIOLATION IN b→s TRANSITIONS AND DOUBLE CHARMONIUM PRODUCTION IN e+e- ANNIHILATIONS

2005 ◽  
Vol 20 (29) ◽  
pp. 2199-2214
Author(s):  
THOMAS ZIEGLER
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Time Dependent ◽  
Short Introduction ◽  
Model Calculations ◽  
Charmonium Production ◽  
The Status ◽  
The Rich

By reviewing the status of time-dependent CP-violation in b →s transitions and double charmonium production in e+e- collisions, two examples of the rich and exciting physics outcome from the B-factories are presented. Both analyses exhibited significant differences in measurement and standard model calculations in the last two years and therefore received particular interest. After a short introduction into the subjects, the results from BaBar and Belle are presented and discussed.

scholarly journals TENSOR INTEGRALS FOR TWO-LOOP STANDARD MODEL CALCULATIONS

1994 ◽  
Vol 09 (12) ◽  
pp. 1105-1120 ◽  
Author(s):  
DIRK KREIMER
Keyword(s):  
Standard Model ◽  
Integral Representations ◽  
New Method ◽  
Model Calculations ◽  
Analytic Expressions ◽  
Finite Integral

We give a new method for the reduction of tensor integrals to finite integral representations and uv divergent analytic expressions. This includes a new method for the handling of the γ-algebra.

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