The impact of top-quark modelling on the exclusion limits in $$\varvec{t{\bar{t}}}+\text {DM}$$ t t ¯ + DM searches at the LHC
Abstract New Physics searches at the LHC rely very heavily on the precision and accuracy of Standard Model background predictions. Applying the spin-0 s-channel mediator model, we assess the importance of properly modelling such backgrounds in $$t{\bar{t}}$$ t t ¯ associated Dark Matter production....
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2021
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oai:doaj.org-article:da6eab9a0d1f4ea8b4bb078256952a2e2021-11-28T12:11:54ZThe impact of top-quark modelling on the exclusion limits in $$\varvec{t{\bar{t}}}+\text {DM}$$ t t ¯ + DM searches at the LHC10.1140/epjc/s10052-021-09831-01434-60441434-6052https://doaj.org/article/da6eab9a0d1f4ea8b4bb078256952a2e2021-11-01T00:00:00Zhttps://doi.org/10.1140/epjc/s10052-021-09831-0https://doaj.org/toc/1434-6044https://doaj.org/toc/1434-6052Abstract New Physics searches at the LHC rely very heavily on the precision and accuracy of Standard Model background predictions. Applying the spin-0 s-channel mediator model, we assess the importance of properly modelling such backgrounds in $$t{\bar{t}}$$ t t ¯ associated Dark Matter production. Specifically, we discuss higher-order corrections and off-shell effects for the two dominant background processes $$t{\bar{t}}$$ t t ¯ and $$t{\bar{t}}Z$$ t t ¯ Z in the presence of extremely exclusive cuts. Exclusion limits are calculated for state-of-the-art NLO full off-shell $$t{\bar{t}}$$ t t ¯ and $$t{\bar{t}}Z$$ t t ¯ Z predictions and compared to those computed with backgrounds in the NWA and / or at LO. We perform the same comparison for several new-physics sensitive observables and evaluate which of them are affected by the top-quark modelling. Additionally, we make suggestions as to which observables should be used to obtain the most stringent limits assuming integrated luminosities of 300 fb $$^{-1}$$ - 1 and 3000 fb $$^{-1}$$ - 1 .J. HermannM. WorekSpringerOpenarticleAstrophysicsQB460-466Nuclear and particle physics. Atomic energy. RadioactivityQC770-798ENEuropean Physical Journal C: Particles and Fields, Vol 81, Iss 11, Pp 1-25 (2021) |
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Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 |
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Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 J. Hermann M. Worek The impact of top-quark modelling on the exclusion limits in $$\varvec{t{\bar{t}}}+\text {DM}$$ t t ¯ + DM searches at the LHC |
| description |
Abstract New Physics searches at the LHC rely very heavily on the precision and accuracy of Standard Model background predictions. Applying the spin-0 s-channel mediator model, we assess the importance of properly modelling such backgrounds in $$t{\bar{t}}$$ t t ¯ associated Dark Matter production. Specifically, we discuss higher-order corrections and off-shell effects for the two dominant background processes $$t{\bar{t}}$$ t t ¯ and $$t{\bar{t}}Z$$ t t ¯ Z in the presence of extremely exclusive cuts. Exclusion limits are calculated for state-of-the-art NLO full off-shell $$t{\bar{t}}$$ t t ¯ and $$t{\bar{t}}Z$$ t t ¯ Z predictions and compared to those computed with backgrounds in the NWA and / or at LO. We perform the same comparison for several new-physics sensitive observables and evaluate which of them are affected by the top-quark modelling. Additionally, we make suggestions as to which observables should be used to obtain the most stringent limits assuming integrated luminosities of 300 fb $$^{-1}$$ - 1 and 3000 fb $$^{-1}$$ - 1 . |
| format |
article |
| author |
J. Hermann M. Worek |
| author_facet |
J. Hermann M. Worek |
| author_sort |
J. Hermann |
| title |
The impact of top-quark modelling on the exclusion limits in $$\varvec{t{\bar{t}}}+\text {DM}$$ t t ¯ + DM searches at the LHC |
| title_short |
The impact of top-quark modelling on the exclusion limits in $$\varvec{t{\bar{t}}}+\text {DM}$$ t t ¯ + DM searches at the LHC |
| title_full |
The impact of top-quark modelling on the exclusion limits in $$\varvec{t{\bar{t}}}+\text {DM}$$ t t ¯ + DM searches at the LHC |
| title_fullStr |
The impact of top-quark modelling on the exclusion limits in $$\varvec{t{\bar{t}}}+\text {DM}$$ t t ¯ + DM searches at the LHC |
| title_full_unstemmed |
The impact of top-quark modelling on the exclusion limits in $$\varvec{t{\bar{t}}}+\text {DM}$$ t t ¯ + DM searches at the LHC |
| title_sort |
impact of top-quark modelling on the exclusion limits in $$\varvec{t{\bar{t}}}+\text {dm}$$ t t ¯ + dm searches at the lhc |
| publisher |
SpringerOpen |
| publishDate |
2021 |
| url |
https://doaj.org/article/da6eab9a0d1f4ea8b4bb078256952a2e |
| work_keys_str_mv |
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