Binned top quark spin correlation and polarization observables for the LHC at 13.6 TeV
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866914815268618240 |
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| author | Bernreuther, Werner Chen, Long Si, Zong-Guo |
| author_facet | Bernreuther, Werner Chen, Long Si, Zong-Guo |
| contents | We consider top-antitop quark $(t{\bar t})$ production at the Large Hadron Collider (LHC) with subsequent decays into dileptonic final states. We use and investigate a set of leptonic angular correlations and distributions with which all the independent coefficient functions of the top-spin dependent parts of the $t{\bar t}$ production spin density matrices can be experimentally probed. We compute these observables for the LHC center-of-mass energy 13.6 TeV within the Standard Model at next-to-leading order in the QCD coupling including the mixed QCD-weak corrections. We determine also the $t{\bar t}$ charge asymmetry where we take in addition also the mixed QCD-QED corrections into account. In addition we analyze and compute possible new physics (NP) effects on these observables in terms of a gauge-invariant effective Lagrangian that contains the operators up to mass dimension six that are relevant for hadronic $(t{\bar t})$ production. First we compute our observables inclusive in phase space. In order to investigate which region in phase space has, for a specific observable, a high NP sensitivity, we determine our observables also in two-dimensional $(M_{t{\bar t}},\cosθ_t^*)$ bins, where $M_{t{\bar t}}$ denotes the $t{\bar t}$ invariant mass and $θ_t^*$ is the top-quark scattering angle in the $t{\bar t}$ zero-momentum frame. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_04371 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Binned top quark spin correlation and polarization observables for the LHC at 13.6 TeV Bernreuther, Werner Chen, Long Si, Zong-Guo High Energy Physics - Phenomenology High Energy Physics - Experiment We consider top-antitop quark $(t{\bar t})$ production at the Large Hadron Collider (LHC) with subsequent decays into dileptonic final states. We use and investigate a set of leptonic angular correlations and distributions with which all the independent coefficient functions of the top-spin dependent parts of the $t{\bar t}$ production spin density matrices can be experimentally probed. We compute these observables for the LHC center-of-mass energy 13.6 TeV within the Standard Model at next-to-leading order in the QCD coupling including the mixed QCD-weak corrections. We determine also the $t{\bar t}$ charge asymmetry where we take in addition also the mixed QCD-QED corrections into account. In addition we analyze and compute possible new physics (NP) effects on these observables in terms of a gauge-invariant effective Lagrangian that contains the operators up to mass dimension six that are relevant for hadronic $(t{\bar t})$ production. First we compute our observables inclusive in phase space. In order to investigate which region in phase space has, for a specific observable, a high NP sensitivity, we determine our observables also in two-dimensional $(M_{t{\bar t}},\cosθ_t^*)$ bins, where $M_{t{\bar t}}$ denotes the $t{\bar t}$ invariant mass and $θ_t^*$ is the top-quark scattering angle in the $t{\bar t}$ zero-momentum frame. |
| title | Binned top quark spin correlation and polarization observables for the LHC at 13.6 TeV |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2403.04371 |