$ϕ$ and $J/ψ$ Production in Proton-Proton Scattering through Hadronic Molecules
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arXiv
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| Format: | Preprint |
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2025
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| author | Ben, Di Zou, Bing-Song |
| author_facet | Ben, Di Zou, Bing-Song |
| contents | This study estimates the contributions of hidden-strangeness hadronic molecular states ($N(2080)3/2^-$, $N(2270)3/2^-$) to $ϕ$ production and hidden-charm $P_c$ states to $J/ψ$ production in $pp$ collisions. The calculated cross-sections reach $\sim 10~μb$ for $pp\to ppϕ$ and $\sim 0.1~nb$ for $pp\to pp J/ψ$ at energies $\sim 2$~GeV above threshold. We also compute the spin density matrix element $ρ_{00}$ and the decay angular distributions for $ϕ\to K^+K^-$ and $J/ψ\toμ^+μ^-$. To support future experiments, we conduct Monte Carlo simulations for the four-body final states of $pp\to ppK^+K^-$ and $pp\to ppμ^+μ^-$. The resulting lab-frame distributions are expected to inform detector design at facilities like the High-Intensity heavy-ion Accelerator Facility (HIAF) and the proposed Chinese Advanced Nuclear Physics Research Facility (CNUF), enabling more precise measurements and tighter theoretical constraints. Furthermore, to explain the STAR collaboration's result on $ϕ$ meson spin alignment in heavy-ion collisions, we propose a novel mechanism involving hidden-strangeness molecular states, testable with future high-statistics $pp\to ppϕ$ data. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_08095 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | $ϕ$ and $J/ψ$ Production in Proton-Proton Scattering through Hadronic Molecules Ben, Di Zou, Bing-Song High Energy Physics - Phenomenology Nuclear Theory This study estimates the contributions of hidden-strangeness hadronic molecular states ($N(2080)3/2^-$, $N(2270)3/2^-$) to $ϕ$ production and hidden-charm $P_c$ states to $J/ψ$ production in $pp$ collisions. The calculated cross-sections reach $\sim 10~μb$ for $pp\to ppϕ$ and $\sim 0.1~nb$ for $pp\to pp J/ψ$ at energies $\sim 2$~GeV above threshold. We also compute the spin density matrix element $ρ_{00}$ and the decay angular distributions for $ϕ\to K^+K^-$ and $J/ψ\toμ^+μ^-$. To support future experiments, we conduct Monte Carlo simulations for the four-body final states of $pp\to ppK^+K^-$ and $pp\to ppμ^+μ^-$. The resulting lab-frame distributions are expected to inform detector design at facilities like the High-Intensity heavy-ion Accelerator Facility (HIAF) and the proposed Chinese Advanced Nuclear Physics Research Facility (CNUF), enabling more precise measurements and tighter theoretical constraints. Furthermore, to explain the STAR collaboration's result on $ϕ$ meson spin alignment in heavy-ion collisions, we propose a novel mechanism involving hidden-strangeness molecular states, testable with future high-statistics $pp\to ppϕ$ data. |
| title | $ϕ$ and $J/ψ$ Production in Proton-Proton Scattering through Hadronic Molecules |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2511.08095 |