CERN Accelerating science

Article
Report number	arXiv:1809.07334 ; UMD-PP-018-05 ; CERN-TH-2018-194
Title	Detecting a Boosted Diboson Resonance
Author(s)	Agashe, Kaustubh (Maryland U.) ; Collins, Jack H. (Maryland U. ; Johns Hopkins U.) ; Du, Peizhi (Maryland U.) ; Hong, Sungwoo (Cornell U., LEPP) ; Kim, Doojin (CERN ; Arizona U.) ; Mishra, Rashmish K. (INFN, Pisa ; Pisa, Scuola Normale Superiore)
Publication	2018-11-06
Imprint	2018-09-19
Number of pages	33
Note	33 pages, 13 figures
In:	JHEP 11 (2018) 027
DOI	10.1007/JHEP11(2018)027
Subject category	hep-ph ; Particle Physics - Phenomenology
Abstract	New light scalar particles in the mass range of hundreds of GeV, decaying into a pair of $W/Z$ bosons can appear in several extensions of the SM. The focus of collider studies for such a scalar is often on its direct production, where the scalar is typically only mildly boosted. The observed $W/Z$ are therefore well-separated, allowing analyses for the scalar resonance in a standard fashion as a low-mass diboson resonance. In this work we instead focus on the scenario where the direct production of the scalar is suppressed, and it is rather produced via the decay of a significantly heavier (a few TeV mass) new particle, in conjunction with SM particles. Such a process results in the scalar being highly boosted, rendering the $W/Z$'s from its decay merged. The final state in such a decay is a "fat" jet, which can be either four-pronged (for fully hadronic $W/Z$ decays), or may be like a $W/Z$ jet, but with leptons buried inside (if one of the $W/Z$ decays leptonically). In addition, this fat jet has a jet mass that can be quite different from that of the $W/Z$/Higgs/top quark-induced jet, and may be missed by existing searches. In this work, we develop dedicated algorithms for tagging such multi-layered "boosted dibosons" at the LHC. As a concrete application, we discuss an extension of the standard warped extra-dimensional framework where such a light scalar can arise. We demonstrate that the use of these algorithms gives sensitivity in mass ranges that are otherwise poorly constrained.
Copyright/License	publication: (License: CC-BY-4.0) preprint: (License: arXiv nonexclusive-distrib 1.0)

Corresponding record in: Inspire