scholarly journals Higher-order electroweak corrections to the partial widths and branching ratios of the Z boson

2014 ◽  
Vol 2014 (4) ◽  
Author(s):  
Ayres Freitas
Keyword(s):  
Z Boson ◽  
Branching Ratios ◽  
Higher Order ◽  
Electroweak Corrections

Supersymmetric Electroweak Corrections to the Decay of the Heavy Chargino into the Light Chargino and Z Boson

2002 ◽  
Vol 38 (2) ◽  
pp. 173-180 ◽  
Author(s):  
Zhou Pei-Jun ◽  
Ma Wen-Gan ◽  
Zhang Ren-You ◽  
Wan Lang-Hui
Keyword(s):  
Z Boson ◽  
Electroweak Corrections

scholarly journals Fixed-order and merged parton-shower predictions for WW and WWj production at the LHC including NLO QCD and EW corrections

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Stephan Bräuer ◽  
Ansgar Denner ◽  
Mathieu Pellen ◽  
Marek Schönherr ◽  
Steffen Schumann
Keyword(s):  
Cross Sections ◽  
Parton Shower ◽  
Higher Order ◽  
Order Effects ◽  
Leading Order ◽  
Combined Analysis ◽  
Fixed Order ◽  
Higher Order Effects ◽  
Inclusive Sample ◽  
Electroweak Corrections

Abstract First, we present a combined analysis of pp $$ \to {\mu}^{+}{v}_{\mu }{\mathrm{e}}^{-}{\overline{v}}_{\mathrm{e}} $$ → μ + v μ e − v ¯ e and pp $$ \to {\mu}^{+}{v}_{\mu }{\mathrm{e}}^{-}{\overline{v}}_{\mathrm{e}}\mathrm{j} $$ → μ + v μ e − v ¯ e j at next-to-leading order, including both QCD and electroweak corrections. Second, we provide all-order predictions for pp $$ \to {\mu}^{+}{v}_{\mu }{\mathrm{e}}^{-}{\overline{v}}_{\mathrm{e}}+ $$ → μ + v μ e − v ¯ e + jets using merged parton-shower simulations that also include approximate EW effects. A fully inclusive sample for WW production is compared to the fixed-order computations for exclusive zero- and one-jet selections. The various higher-order effects are studied in detail at the level of cross sections and differential distributions for realistic experimental set-ups. Our study confirms that merged predictions are significantly more stable than the fixed-order ones in particular regarding ratios between the two processes.

scholarly journals NLO QCD and electroweak corrections to Z + γ production with leptonic Z-boson decays

2016 ◽  
Vol 2016 (2) ◽  
Author(s):  
Ansgar Denner ◽  
Stefan Dittmaier ◽  
Markus Hecht ◽  
Christian Pasold
Keyword(s):  
Z Boson ◽  
Z Boson Decays ◽  
Electroweak Corrections

scholarly journals THE LEPTON FLAVOR VIOLATING DECAYS Z→li lj IN THE SIMPLEST LITTLE HIGGS MODEL

2012 ◽  
Vol 27 (28) ◽  
pp. 1250158 ◽  
Author(s):  
XIAO-FANG HAN ◽  
LEI WANG
Keyword(s):  
Standard Model ◽  
Z Boson ◽  
Branching Ratios ◽  
Higgs Model ◽  
Little Higgs ◽  
Decay Modes ◽  
Lepton Flavor ◽  
Loop Level ◽  
Flavor Changing ◽  
The Standard Model

In the simplest little Higgs model the new flavor-changing interactions between heavy neutrinos and the Standard Model leptons can generate contributions to some lepton flavor violating decays of Z-boson at one-loop level, such as Z→τ±μ∓, Z→τ±e∓ and Z→μ±e∓. We examine the decay modes and find that the branching ratios can reach 10-7 for the three decays, which should be accessible at the GigaZ option of the ILC.

NLO K factors for ZZ double vector boson pairs in proton–proton collisions

2018 ◽  
Vol 33 (26) ◽  
pp. 1850153
Author(s):  
Kamuran Dilsiz
Keyword(s):  
Z Boson ◽  
Vector Boson ◽  
Higher Order ◽  
Boson Mass ◽  
Matrix Elements ◽  
Proton Proton ◽  
Proton Collisions ◽  
Order Matrix ◽  
The Impact ◽  
Proton Proton Collisions

The impact of higher-order matrix elements and [Formula: see text] and [Formula: see text] scales on the NLO K factors for ZZ vector boson pairs in proton–proton collisions are presented in this study. All predictions are performed using MCFM-8.0 Monte Carlo generator. First, the QCD predictions of ZZ production at LO and NLO accuracies are obtained using two most recent PDFs, MMHT2014 and CT14. To discuss the impact of higher-order matrix elements on the NLO K factors, both LO and NLO corrections are obtained by LO, NLO and NNLO matrix elements of these two most recent PDFs. Then, the impact of [Formula: see text] and [Formula: see text] scales on the NLO K factors are further discussed by using six different values of [Formula: see text] and [Formula: see text] in a range of [Formula: see text], [Formula: see text], where [Formula: see text] is Z boson mass.

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