期刊
PHYSICS LETTERS B
卷 811, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.physletb.2020.135964
关键词
Top quarks; Jet matching; Large hadron collider
资金
- Faculty of Science Doctoral Internship Program at the University of the Witwatersrand
- European Union's Horizon 2020 research and innovation programme as part of the Marie Sklodowska-Curie Innovative Training Network MCnetITN3 [722104]
- FNRS Excellence of Science EOS be.h Project [30820817]
- National Research Foundation
- Department of Science and Innovation
- UCLouvain fund MOVE-IN Louvain
- Fond de la Recherche Scientifique de Belgique (F.R.S.-FNRS) [2.5020.11]
- Walloon Region
- VBSCan COST Action [CA16108]
In LHC searches for new and rare phenomena the top-associated channel pp -> t (t) over barW(+/-) + X is a challenging background that multilepton analyses must overcome. Motivated by sustained measurements of enhanced rates of same-sign and multi-lepton final states, we reexamine the importance of higher jet multiplicities in pp -> t (t) over barW(+/-) + X that enter at O(alpha(3)(s)alpha) and O(alpha(4)(s)alpha), i.e., that contribute at NLO and NNLO in QCD in inclusive t (t) over barW(+/-) production. Using fixed-order computations, we estimate that a mixture of real and virtual corrections at O(alpha(4)(s)alpha) in well-defined regions of phase space can arguably increase the total t (t) over barW(+/-) rate at NLO by at least 10% - 14%. However, by using non-unitary NLO multi-jet matching, we estimate that these same corrections are at most 10% - 12%, and at the same time exhibit the enhanced jet multiplicities that are slightly favored by data. This seeming incongruity suggests a need for the full NNLO result. We comment on implications for the t (t) over barZ process. (C) 2020 The Author(s). Published by Elsevier B.V.
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