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<p>Scalar particles that couple to two up quarks may be produced at the LHC even if they are ultraheavy, in the 8 − 10 TeV mass range. A renormalizable theory that includes a diquark particle of this type (<i>S</i><sub><i>uu</i></sub>), two vectorlike quarks (<i>χ</i><sub>1</sub>, <i>χ</i><sub>2</sub>), and a gauge-singlet pseudoscalar, predicts LHC signals involving four or more jets of very high <i>p</i><sub><i>T</i></sub>. Two remarkable events observed by the CMS experiment, each involving four high-<i>p</i><sub><i>T</i></sub> jets, may be due to an <i>S</i><sub><i>uu</i></sub> of mass near 8.5 TeV, and a <i>χ</i><sub>2</sub> mass of 2.1 TeV. A separate excess reported by CMS in the nonresonant dijet pair search is consistent with a <i>χ</i><sub>1</sub> mass of 0<i>.</i>95 TeV. This hypothesis may be tested through CMS and ATLAS searches for signals with a pair of dijet resonances of masses clustered around 1 TeV, and separately around 2 TeV, which have 4<i>j</i> invariant masses in the 5 − 8 TeV range. These additional signals would arise from cascade decays of <i>S</i><sub><i>uu</i></sub> → <i>χ</i><sub>2</sub> <i>χ</i><sub>2</sub>, which lead to 5<i>j</i> and 6<i>j</i> events with invariant masses around 8 TeV. Depending on the couplings of the heavy colored particles, additional signals are possible, involving for example highly-boosted top quarks.</p>

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TeV-scale particles and LHC events with dijet pairs

  • 期刊论文

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  • 发表日期：

    2025年6月12日

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  • Bogdan A. Dobrescu

摘要

Scalar particles that couple to two up quarks may be produced at the LHC even if they are ultraheavy, in the 8 − 10 TeV mass range. A renormalizable theory that includes a diquark particle of this type (Suu), two vectorlike quarks (χ1, χ2), and a gauge-singlet pseudoscalar, predicts LHC signals involving four or more jets of very high pT. Two remarkable events observed by the CMS experiment, each involving four high-pT jets, may be due to an Suu of mass near 8.5 TeV, and a χ2 mass of 2.1 TeV. A separate excess reported by CMS in the nonresonant dijet pair search is consistent with a χ1 mass of 0.95 TeV. This hypothesis may be tested through CMS and ATLAS searches for signals with a pair of dijet resonances of masses clustered around 1 TeV, and separately around 2 TeV, which have 4j invariant masses in the 5 − 8 TeV range. These additional signals would arise from cascade decays of Suu → χ2 χ2, which lead to 5j and 6j events with invariant masses around 8 TeV. Depending on the couplings of the heavy colored particles, additional signals are possible, involving for example highly-boosted top quarks.