top quark decay
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2021 ◽  
Vol 104 (11) ◽  
Author(s):  
Peng-Cheng Lu ◽  
Zong-Guo Si ◽  
Zhe Wang ◽  
Xing-Hua Yang

2021 ◽  
Vol 822 ◽  
pp. 136704
Author(s):  
S. Slabospitskii

2021 ◽  
Vol 81 (7) ◽  
Author(s):  
Giuseppe Bevilacqua ◽  
Huan-Yu Bi ◽  
Heribertus Bayu Hartanto ◽  
Manfred Kraus ◽  
Jasmina Nasufi ◽  
...  

AbstractRecent discrepancies between theoretical predictions and experimental data in multi-lepton plus b-jets analyses for the $$t{\bar{t}}W^\pm $$ t t ¯ W ± process, as reported by the ATLAS collaboration, have indicated that more accurate theoretical predictions and high precision observables are needed to constrain numerous new physics scenarios in this channel. To this end we employ NLO QCD computations with full off-shell top quark effects included to provide theoretical predictions for the $$\mathcal{R}= \sigma _{t{\bar{t}}W^+}/\sigma _{t{\bar{t}}W^-}$$ R = σ t t ¯ W + / σ t t ¯ W - cross section ratio at the LHC with $$\sqrt{s}=13$$ s = 13 TeV. Depending on the transverse momentum cut on the b-jet we obtain 2–3% theoretical precision on $$\mathcal{R}$$ R , which should help to shed some light on new physics effects that can reveal themselves only once sufficiently precise Standard Model theoretical predictions are available. Furthermore, triggered by these discrepancies we reexamine the charge asymmetry of the top quark and its decay products in the $$t{\bar{t}}W^\pm $$ t t ¯ W ± production process. In the case of charge asymmetries, that are uniquely sensitive to the chiral nature of possible new physics in this channel, theoretical uncertainties below 15% are obtained. Additionally, the impact of the top quark decay modelling is scrutinised by explicit comparison with predictions in the narrow-width approximation.


2021 ◽  
pp. 136375
Author(s):  
I. Turk Cakir ◽  
O. Cakir ◽  
H. Denizli ◽  
A. Senol ◽  
A. Yilmaz

2019 ◽  
Vol 13 (2) ◽  
pp. 289-293
Author(s):  
Mauricio Rozo-Clavijo ◽  
Carlos Germán Cortés-Hernández ◽  
Javier Alberto Olarte-Torres

Is investigated the top quark decay (t) two bodies using the spectator model. Is analyzed the decay (t→bW⁺) calculated theoretically the width of decay and decay fraction of the particle whose result is compared with the experimental data of the table Particle Data group. The model prediction on the decay process can be considered good as a first approach to this class of decay. This type of analysis is particularly important because it allows one hand, familiarize students with the decays of particles and on the other, open a space to introduce topics of particle physics in the introductory courses at university level.


2018 ◽  
Vol 97 (9) ◽  
Author(s):  
A. Czarnecki ◽  
S. Groote ◽  
J. G. Körner ◽  
J. H. Piclum

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