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Probing an MeV-scale scalar boson in association with a TeV-Scale top-quark partner at the LHC

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [3];  [3];  [4];  [5]
  1. Texas A & M Univ., College Station, TX (United States); Texas A & M Univ., College Station, TX (United States)
  2. Texas A & M Univ., College Station, TX (United States); Korea Institute for Advanced Study (KIAS), Seoul (Korea, Republic of)
  3. Vanderbilt Univ., Nashville, TN (United States)
  4. Texas A & M Univ., College Station, TX (United States)
  5. Univ. of Hawaii, Honolulu, HI (United States)
+ Show Author Affiliations
Searches for new low-mass matter and mediator particles have actively been pursued at fixed target experiments and at e+e- colliders. It is challenging at the CERN LHC, but they have been searched for in Higgs boson decays and in B meson decays by the ATLAS and CMS Collaborations, as well as in a low transverse momentum phenomena from forward scattering processes (e.g., FASER). We propose a search for a new scalar particle in association with a heavy vector-like quark. We consider the scenario in which the top quark (t) couples to a light scalar φ' and a heavy vector-like top quark T. We examine single and pair production of T in pp collisions, resulting in a final state with a top quark that decays purely hadronically, a T which decays semileptonically (T → W + b → ℓ ν b), and a φ' that is very boosted and decays to a pair of collimated photons which can be identified as a merged photon system. The proposed search is expected to achieve a discovery reach with signal significance greater than 5σ (3σ) for m(T) as large as 1.8 (2) TeV and m(φ') as small as 1 MeV, assuming an integrated luminosity of 3000 fb-1. This search can expand the reach of T, and demonstrates that the LHC can probe low-mass, MeV-scale particles.
Research Organization:
Texas A & M Univ., College Station, TX (United States); Univ. of Hawaii, Honolulu, HI (United States)
Sponsoring Organization:
National Research Foundation of Korea (NRF); National Science Foundation (NSF); USDOE Office of Science (SC)
Grant/Contract Number:
SC0010504; SC0010813
OSTI ID:
2420048
Journal Information:
Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 3 Vol. 2023; ISSN 1029-8479
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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  • Moneta, Lorenzo; Cranmer, Kyle; Schott, Gregory
  • Proceedings of 13th International Workshop on Advanced Computing and Analysis Techniques in Physics Research — PoS(ACAT2010) https://doi.org/10.22323/1.093.0057
conference February 2011

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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Vector-Like Fermions