Matching in $$ pp\to t\overline{t}W/Z/h+ $$ jet SMEFT studies
نویسندگان
چکیده
A bstract In this paper, we explore the impact of extra radiation on predictions $$ pp\to \mathrm{t}\overline{\mathrm{t}}\mathrm{X},\mathrm{X}=\mathrm{h}/{\mathrm{W}}^{\pm }/\mathrm{Z} pp → t ¯ X , = h / W ± Z processes within dimension-6 SMEFT framework. While full next-to-leading order calculations are course preferred, they not always practical, and so it is useful to be able capture impacts using leading-order matrix elements matched parton shower merged. a matched/merged calculation for \mathrm{t}\overline{\mathrm{t}}\mathrm{X} expected reproduce inclusive cross section precisely, show that does relative EFT effects by considering ratio sections Standard Model values, {\sigma}_{\mathrm{SM}\mathrm{EFT}}\left(\mathrm{t}\overline{\mathrm{t}}\mathrm{X}+\mathrm{j}\right)/{\sigma}_{\mathrm{SM}}\left(\mathrm{t}\overline{\mathrm{t}}\mathrm{X}+\mathrm{j}\right)\equiv \mu σ SMEFT + j SM ≡ μ . Furthermore, compare leading with without find several cases, such as effect operator \left({\varphi}^{\dagger }i{\overleftrightarrow{D}}_{\mu}\varphi \right)\left(\overline{t}{\gamma}^{\mu }t\right) φ † i D ↔ γ \mathrm{t}\overline{\mathrm{t}}\mathrm{h} \mathrm{t}\overline{\mathrm{t}}\mathrm{W} , which prediction increases more than 10% — significantly larger uncertainty derived varying input scales in calculation, including additional required matching merging. Being at heart, merging can applied all operators relevant }/\mathrm{Z}+\mathrm{jet} jet computationally fast susceptible negative weights. Therefore, approach + jet studies where complete results currently unavailable or unwieldy.
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2021
ISSN: ['1127-2236', '1126-6708', '1029-8479']
DOI: https://doi.org/10.1007/jhep06(2021)151