Scalar production and decay to top quarks including interference effects at NLO in QCD in an EFT approach
Abstract
Scalar and pseudo-scalar resonances decaying to top quarks are common predictions in several scenarios beyond the standard model (SM) and are extensively searched for by LHC experiments. Challenges on the experimental side require optimising the strategy based on accurate predictions. Firstly, QCD corrections are known to be large both for the SM QCD background and for the pure signal scalar production. Secondly, leading order and approximate next-to-leading order (NLO) calculations indicate that the interference between signal and background is large and drastically changes the lineshape of the signal, from a simple peak to a peak-dip structure. Therefore, a robust prediction of this interference at NLO accuracy in QCD is necessary to ensure that higher-order corrections do not alter the lineshapes. We compute the exact NLO corrections, assuming a point-like coupling between the scalar and the gluons and consistently embedding the calculation in an effective field theory within an automated framework, and present results for a representative set of beyond the SM benchmarks. The results can be further matched to parton shower simulation, providing more realistic predictions. We find that NLO corrections are important and lead to a significant reduction of the uncertainties. We also discuss how our computation can bemore »
- Authors:
-
- Gottingen Univ. (Germany). Inst. of Physics
- Nikhef, Amsterdam (Netherlands)
- Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Physics; Chinese Academy of Sciences (CAS), Beijing (China). Inst. of High Energy Physics
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Nikhef, Amsterdam (Netherlands); Chinese Academy of Sciences (CAS), Beijing (China)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); European Union (EU); Netherlands Organisation for Scientific Research (NWO); Chinese Academy of Sciences (CAS)
- OSTI Identifier:
- 1412736
- Report Number(s):
- BNL-114557-2017-JA
Journal ID: ISSN 1029-8479; KA2401012; TRN: US1800335
- Grant/Contract Number:
- SC0012704; 722104
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Journal of High Energy Physics (Online)
- Additional Journal Information:
- Journal Volume: 2017; Journal Issue: 10; Journal ID: ISSN 1029-8479
- Publisher:
- Springer Berlin
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; NLO computations; QCD phenomenology
Citation Formats
Franzosi, Diogo Buarque, Vryonidou, Eleni, and Zhang, Cen. Scalar production and decay to top quarks including interference effects at NLO in QCD in an EFT approach. United States: N. p., 2017.
Web. doi:10.1007/JHEP10(2017)096.
Franzosi, Diogo Buarque, Vryonidou, Eleni, & Zhang, Cen. Scalar production and decay to top quarks including interference effects at NLO in QCD in an EFT approach. United States. https://doi.org/10.1007/JHEP10(2017)096
Franzosi, Diogo Buarque, Vryonidou, Eleni, and Zhang, Cen. 2017.
"Scalar production and decay to top quarks including interference effects at NLO in QCD in an EFT approach". United States. https://doi.org/10.1007/JHEP10(2017)096. https://www.osti.gov/servlets/purl/1412736.
@article{osti_1412736,
title = {Scalar production and decay to top quarks including interference effects at NLO in QCD in an EFT approach},
author = {Franzosi, Diogo Buarque and Vryonidou, Eleni and Zhang, Cen},
abstractNote = {Scalar and pseudo-scalar resonances decaying to top quarks are common predictions in several scenarios beyond the standard model (SM) and are extensively searched for by LHC experiments. Challenges on the experimental side require optimising the strategy based on accurate predictions. Firstly, QCD corrections are known to be large both for the SM QCD background and for the pure signal scalar production. Secondly, leading order and approximate next-to-leading order (NLO) calculations indicate that the interference between signal and background is large and drastically changes the lineshape of the signal, from a simple peak to a peak-dip structure. Therefore, a robust prediction of this interference at NLO accuracy in QCD is necessary to ensure that higher-order corrections do not alter the lineshapes. We compute the exact NLO corrections, assuming a point-like coupling between the scalar and the gluons and consistently embedding the calculation in an effective field theory within an automated framework, and present results for a representative set of beyond the SM benchmarks. The results can be further matched to parton shower simulation, providing more realistic predictions. We find that NLO corrections are important and lead to a significant reduction of the uncertainties. We also discuss how our computation can be used to improve the predictions for physics scenarios where the gluon-scalar loop is resolved and the effective approach is less applicable.},
doi = {10.1007/JHEP10(2017)096},
url = {https://www.osti.gov/biblio/1412736},
journal = {Journal of High Energy Physics (Online)},
issn = {1029-8479},
number = 10,
volume = 2017,
place = {United States},
year = {Fri Oct 13 00:00:00 EDT 2017},
month = {Fri Oct 13 00:00:00 EDT 2017}
}
Web of Science
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