Octet scalars shaping LHC distributions in 4-jet final states
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arXiv
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| Auteurs principaux: | , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866913031556956160 |
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| author | Dobrescu, Bogdan A. Fieg, Max H. |
| author_facet | Dobrescu, Bogdan A. Fieg, Max H. |
| contents | We study properties of a hypothetical scalar particle, $Θ$, which is a color octet and an electroweak singlet. At hadron colliders, $Θ$ is pair produced through its QCD coupling to gluons, so that its mass determines the cross section. It decays at tree level into $q\bar q$ through dimension-5 operators, and at one loop into gluons. Thus, the main LHC signature of $Θ$ is a pair of dijets of equal invariant mass. The CMS search in this channel shows a $3.6σ$ excess over the QCD background for a dijet mass $M_{jj} \approx 0.95$ TeV, which can be due to $Θ$: its production cross section (65 fb for a real scalar) and the acceptance of the CMS event selection applied to $p p \to ΘΘ\to \! (q \bar q)(q \bar q)$ yield a rate consistent with the excess. Furthermore, the shape of the $dσ/d M_{jj}$ signal is in agreement with the CMS result. Given the data-driven background fit performed by CMS, we find that a complex scalar fits better the data than a real scalar. Besides the pair of dijets, testable LHC signals include a trijet-dijet topology, a $t\bar t$ pair plus a dijet resonance, as well as final states involving a Higgs, $W$ or $Z$ boson plus jets. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_09632 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Octet scalars shaping LHC distributions in 4-jet final states Dobrescu, Bogdan A. Fieg, Max H. High Energy Physics - Phenomenology High Energy Physics - Experiment We study properties of a hypothetical scalar particle, $Θ$, which is a color octet and an electroweak singlet. At hadron colliders, $Θ$ is pair produced through its QCD coupling to gluons, so that its mass determines the cross section. It decays at tree level into $q\bar q$ through dimension-5 operators, and at one loop into gluons. Thus, the main LHC signature of $Θ$ is a pair of dijets of equal invariant mass. The CMS search in this channel shows a $3.6σ$ excess over the QCD background for a dijet mass $M_{jj} \approx 0.95$ TeV, which can be due to $Θ$: its production cross section (65 fb for a real scalar) and the acceptance of the CMS event selection applied to $p p \to ΘΘ\to \! (q \bar q)(q \bar q)$ yield a rate consistent with the excess. Furthermore, the shape of the $dσ/d M_{jj}$ signal is in agreement with the CMS result. Given the data-driven background fit performed by CMS, we find that a complex scalar fits better the data than a real scalar. Besides the pair of dijets, testable LHC signals include a trijet-dijet topology, a $t\bar t$ pair plus a dijet resonance, as well as final states involving a Higgs, $W$ or $Z$ boson plus jets. |
| title | Octet scalars shaping LHC distributions in 4-jet final states |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2511.09632 |