Odd top partners at the LHC

Anandakrishnan, Archana; Collins, Jack H.; Farina, Marco; Kuflik, Eric; Perelstein, Maxim

doi:10.1103/PhysRevD.93.075009

Odd top partners at the LHC

Journal Article · Tue Apr 05 00:00:00 EDT 2016 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.93.075009· OSTI ID:1602514

Anandakrishnan, Archana ^[1]; Collins, Jack H. ^[2]; Farina, Marco ^[2]; Kuflik, Eric ^[2]; Perelstein, Maxim ^[2]

Cornell Univ., Ithaca, NY (United States); Ohio State University
Cornell Univ., Ithaca, NY (United States)

LHC searches for fermionic top partners $$T$$ focus on three decay topologies: $$T\to bW$$, $$T\to tZ$$, and $$T\to th$$. However, top partners may carry new conserved quantum numbers that forbid these decays. The simplest possibility is a conserved parity, under which the top partner is odd and all SM states are even. In this case, decays of top partners may involve new particle-odd scalars, leading to signal topologies more commonly associated with supersymmetry, either with or without R-parity conservation. We study a simplified model in which this possibility is realized, and estimate the bounds on the top partner mass in this model implied by LHC searches for supersymmetry. We find that the bounds can be significantly weaker than in the conventional top partner decay scenario. For instance, if the new parity is exact, a 500 GeV top partner is allowed as long as the lightest parity-odd scalar mass is between 325 and 500 GeV. The lower allowed top partner mass reduces the need for fine-tuning in the Higgs mass parameter, compared to the conventional decay scenario. We also present an explicit model, the Oddest Little Higgs, which exhibits this phenomenology.

View Accepted Manuscript (DOE)

Research Organization:: The Ohio State Univ., Columbus, OH (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Grant/Contract Number:: SC0011726

OSTI ID:: 1602514

Journal Information:: Physical Review D, Journal Name: Physical Review D Journal Issue: 7 Vol. 93; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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