LHC di-dijet excesses as signals of fourth-generation tetraquarks
- 1Academia Sinica
Abstract
We postulate that the excesses of di-dijet events observed at the LHC are attributed to the production of four fourth-generation quarks b' b ′ with a mass mb'≈ 2 m b ′ ≈ 2 TeV at few-TeV scales. The di-dijet signals around the four-jet invariant mass m4j≈ 8 m 4 j ≈ 8 TeV arise from a resonant b'b'b̅'b̅' b ′ b ′ b ¯ ′ b ¯ ′ tetraquark production, where the dijet resonances of masses about 2 TeV correspond to b'b̅' b ′ b ¯ ′ first excited states (color-octet scalars with the principal quantum number n=2 n = 2 ) in a Yukawa potential created by Higgs boson exchanges. Those around m4j≈ 3.6 m 4 j ≈ 3.6 TeV originate from a non-resonant b'b'b̅'b̅' b ′ b ′ b ¯ ′ b ¯ ′ production, where the dijet resonances of masses 0.95 TeV correspond to b'b̅' b ′ b ¯ ′ ground states (color-octet vectors with n=1 n = 1 ). It is shown that a b'b̅' b ′ b ¯ ′ system with mb'≈ 2 m b ′ ≈ 2 TeV in the Yukawa potential does generate the aforementioned bound state spectrum. We then illustrate that the observed excesses can be accommodated in our setup by translating the fourth-generation model to the effective theories containing color-octet scalars and vectors available in the literature. Simply speaking, our scenario can be viewed as a TeV-scale analogue of the search for a fully charmed tetraquark via the four-muon channels X(6900)→ (cc̅)(cc̅)→ 4μ X ( 6900 ) → ( c c ¯ ) ( c c ¯ ) → 4 μ at a GeV scale.
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BibTeX
@article{li2026didijet,
title = {{LHC di-dijet excesses as signals of fourth-generation tetraquarks}},
author = {Hsiang-nan Li},
journal = {The European Physical Journal C},
year = {2026},
month = oct,
doi = {10.1140/epjc/s10052-026-16517-y},
url = {https://link.springer.com/article/10.1140/epjc/s10052-026-16517-y},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - LHC di-dijet excesses as signals of fourth-generation tetraquarks
AU - Hsiang-nan Li
PY - 2026
DA - 2026/10/29
JO - The European Physical Journal C
DO - 10.1140/epjc/s10052-026-16517-y
UR - https://link.springer.com/article/10.1140/epjc/s10052-026-16517-y
AB - We postulate that the excesses of di-dijet events observed at the LHC are attributed to the production of four fourth-generation quarks b' b ′ with a mass m_b'≈ 2 m b ′ ≈ 2 TeV at few-TeV scales. The di-dijet signals around the four-jet invariant mass m_4j≈ 8 m 4 j ≈ 8 TeV arise from a resonant b'b'b̅'b̅' b ′ b ′ b ¯ ′ b ¯ ′ tetraquark production, where the dijet resonances of masses about 2 TeV correspond to b'b̅' b ′ b ¯ ′ first excited states (color-octet scalars with the principal quantum number n=2 n = 2 ) in a Yukawa potential created by Higgs boson exchanges. Those around m_4j≈ 3.6 m 4 j ≈ 3.6 TeV originate from a non-resonant b'b'b̅'b̅' b ′ b ′ b ¯ ′ b ¯ ′ production, where the dijet resonances of masses 0.95 TeV correspond to b'b̅' b ′ b ¯ ′ ground states (color-octet vectors with n=1 n = 1 ). It is shown that a b'b̅' b ′ b ¯ ′ system with m_b'≈ 2 m b ′ ≈ 2 TeV in the Yukawa potential does generate the aforementioned bound state spectrum. We then illustrate that the observed excesses can be accommodated in our setup by translating the fourth-generation model to the effective theories containing color-octet scalars and vectors available in the literature. Simply speaking, our scenario can be viewed as a TeV-scale analogue of the search for a fully charmed tetraquark via the four-muon channels X(6900)→ (cc̅)(cc̅)→ 4μ X ( 6900 ) → ( c c ¯ ) ( c c ¯ ) → 4 μ at a GeV scale.
SN - 1434-6052
SN - 1434-6044
ER -