Challenges and opportunities for heavy scalar searches in the tt¯ channel at the LHC

Carena, Marcela; Liu, Zhen

doi:10.1007/JHEP11(2016)159

Title: Challenges and opportunities for heavy scalar searches in the tt¯ channel at the LHC

Journal Article · Fri Nov 25 00:00:00 EST 2016 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP11(2016)159· OSTI ID:1333684

Carena, Marcela ^[1]; Liu, Zhen ^[2]

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Heavy scalar and pseudoscalar resonance searches through the $$gg\rightarrow S\rightarrow t\bar t$$ process are challenging due to the peculiar behavior of the large interference effects with the standard model $$t\bar t$$ background. Such effects generate non-trivial lineshapes from additional relative phases between the signal and background amplitudes. We provide the analytic expressions for the differential cross sections to understand the interference effects in the heavy scalar signal lineshapes. We extend our study to the case of CP-violation and further consider the effect of bottom quarks in the production and decay processes. We also evaluate the contributions from additional particles to the gluon fusion production process, such as stops and vector-like quarks, that could lead to significant changes in the behavior of the signal lineshapes. Taking into account the large interference effects, we perform lineshape searches at the LHC and discuss the importance of the systematic uncertainties and smearing effects. Lastly, we present projected sensitivities for two LHC performance scenarios to probe the $$gg\rightarrow S \rightarrow t\bar t$$ channel in various models.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1333684

Report Number(s):: FERMILAB-PUB-16-262-T; arXiv:1608.07282; 1484164

Journal Information:: Journal of High Energy Physics (Online), Vol. 2016, Issue 11; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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