Modelling top-quark decays in $t\bar{t}t\bar{t}$ production at the LHC
Fuente:
arXiv
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912752788832256 |
|---|---|
| author | Alsairafi, Manal Dimitrakopoulos, Nikolaos Worek, Malgorzata |
| author_facet | Alsairafi, Manal Dimitrakopoulos, Nikolaos Worek, Malgorzata |
| contents | We compare the fixed-order NLO QCD predictions for the $pp\to t\bar{t}t\bar{t}+X$ process in the $4\ell$ decay channel with the parton-shower based results obtained with the POWHEG and MC@NLO matching methods. In the first case, NLO QCD corrections are consistently included in both the $t\bar{t}t\bar{t}$ production step and the decays of the four top quarks, preserving all spin correlations. In the second approach, higher-order effects in top-quark decays with approximate spin correlations are simulated in the PYTHIA parton-shower framework. Additionally, we analyse the impact of including the so-called matrix element corrections in top-quark decays in both parton-shower matched predictions. The comparison is performed at the integrated and differential fiducial cross-section level for the LHC centre-of-mass energy of $\sqrt{s}=13.6$ TeV. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_04849 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Modelling top-quark decays in $t\bar{t}t\bar{t}$ production at the LHC Alsairafi, Manal Dimitrakopoulos, Nikolaos Worek, Malgorzata High Energy Physics - Phenomenology High Energy Physics - Experiment We compare the fixed-order NLO QCD predictions for the $pp\to t\bar{t}t\bar{t}+X$ process in the $4\ell$ decay channel with the parton-shower based results obtained with the POWHEG and MC@NLO matching methods. In the first case, NLO QCD corrections are consistently included in both the $t\bar{t}t\bar{t}$ production step and the decays of the four top quarks, preserving all spin correlations. In the second approach, higher-order effects in top-quark decays with approximate spin correlations are simulated in the PYTHIA parton-shower framework. Additionally, we analyse the impact of including the so-called matrix element corrections in top-quark decays in both parton-shower matched predictions. The comparison is performed at the integrated and differential fiducial cross-section level for the LHC centre-of-mass energy of $\sqrt{s}=13.6$ TeV. |
| title | Modelling top-quark decays in $t\bar{t}t\bar{t}$ production at the LHC |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2507.04849 |