Probing an MeV-scale scalar boson in association with a TeV-Scale top-quark partner at the LHC
Abstract 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 wel...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-03-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP03(2023)164 |
| _version_ | 1797795900901294080 |
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| author | Bhaskar Dutta Sumit Ghosh Alfredo Gurrola Dale Julson Teruki Kamon Jason Kumar |
| author_facet | Bhaskar Dutta Sumit Ghosh Alfredo Gurrola Dale Julson Teruki Kamon Jason Kumar |
| author_sort | Bhaskar Dutta |
| collection | DOAJ |
| description | Abstract 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. |
| first_indexed | 2024-03-13T03:25:00Z |
| format | Article |
| id | doaj.art-318c6fd7e5e64102a7d8cb8acacab1ac |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-03-13T03:25:00Z |
| publishDate | 2023-03-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-318c6fd7e5e64102a7d8cb8acacab1ac2023-06-25T11:04:55ZengSpringerOpenJournal of High Energy Physics1029-84792023-03-012023312510.1007/JHEP03(2023)164Probing an MeV-scale scalar boson in association with a TeV-Scale top-quark partner at the LHCBhaskar Dutta0Sumit Ghosh1Alfredo Gurrola2Dale Julson3Teruki Kamon4Jason Kumar5Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A&M UniversityMitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A&M UniversityDepartment of Physics and Astronomy, Vanderbilt UniversityDepartment of Physics and Astronomy, Vanderbilt UniversityMitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A&M UniversityDepartment of Physics and Astronomy, University of HawaiiAbstract 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.https://doi.org/10.1007/JHEP03(2023)164New Light ParticlesVector-Like Fermions |
| spellingShingle | Bhaskar Dutta Sumit Ghosh Alfredo Gurrola Dale Julson Teruki Kamon Jason Kumar Probing an MeV-scale scalar boson in association with a TeV-Scale top-quark partner at the LHC Journal of High Energy Physics New Light Particles Vector-Like Fermions |
| title | Probing an MeV-scale scalar boson in association with a TeV-Scale top-quark partner at the LHC |
| title_full | Probing an MeV-scale scalar boson in association with a TeV-Scale top-quark partner at the LHC |
| title_fullStr | Probing an MeV-scale scalar boson in association with a TeV-Scale top-quark partner at the LHC |
| title_full_unstemmed | Probing an MeV-scale scalar boson in association with a TeV-Scale top-quark partner at the LHC |
| title_short | Probing an MeV-scale scalar boson in association with a TeV-Scale top-quark partner at the LHC |
| title_sort | probing an mev scale scalar boson in association with a tev scale top quark partner at the lhc |
| topic | New Light Particles Vector-Like Fermions |
| url | https://doi.org/10.1007/JHEP03(2023)164 |
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