Scalar production and decay to top quarks including interference effects at NLO in QCD in an EFT approach

Franzosi, Diogo Buarque; Vryonidou, Eleni; Zhang, Cen

doi:10.1007/JHEP10(2017)096

Title: Scalar production and decay to top quarks including interference effects at NLO in QCD in an EFT approach

Journal Article · Fri Oct 13 00:00:00 EDT 2017 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/JHEP10(2017)096 · OSTI ID:1412736

Franzosi, Diogo Buarque ^[1]; Vryonidou, Eleni ^[2]; Zhang, Cen ^[3]

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

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.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States); Nikhef, Amsterdam (Netherlands); Chinese Academy of Sciences (CAS), Beijing (China)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); European Union (EU); Netherlands Organisation for Scientific Research (NWO); Chinese Academy of Sciences (CAS)

Grant/Contract Number:: SC0012704

OSTI ID:: 1412736

Report Number(s):: BNL--114557-2017-JA; KA2401012

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 10 Vol. 2017; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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