Measurement of di-muons from 400 GeV/c protons interacting in a thick molybdenum/tungsten target
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866910102939762688 |
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| author | The SHiP Collaboration |
| author_facet | The SHiP Collaboration |
| contents | Di-muon events emanating from a replica of the SHiP target at the CERN SPS contain a clear signal of $J/ψ$~production. The production rate is in reasonable agreement with Monte Carlo simulations based on Pythia v8. For the interval in rapidity defined in the center of mass, $y_{cm}$, with the largest overlap with the NA50 measurement, $0.3 < y_{cm} < 0.6$, we obtain the production cross-section per nucleon $σ(J/ψ)/A$ including the branching ratios of $J/ψ$ decays into muons, $B_{μμ}$: $B_{μμ}σ(J/ψ)/A=(1.18~\pm~0.04~\pm~0.10)~\rm{nb}$/nucleon. This is to be compared to the NA50 extrapolated result (using a much thinner target): $B_{μμ}σ(J/ψ)/A=(0.99~\pm~0.04)~\rm{nb}$/nucleon. Within the systematic errors, no significant enhancement due to secondary production of $J/ψ$ inside the target is observed. An upper limit of possible contributions from cascade collisions of $<32\%$ is obtained. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_03661 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Measurement of di-muons from 400 GeV/c protons interacting in a thick molybdenum/tungsten target The SHiP Collaboration High Energy Physics - Experiment Di-muon events emanating from a replica of the SHiP target at the CERN SPS contain a clear signal of $J/ψ$~production. The production rate is in reasonable agreement with Monte Carlo simulations based on Pythia v8. For the interval in rapidity defined in the center of mass, $y_{cm}$, with the largest overlap with the NA50 measurement, $0.3 < y_{cm} < 0.6$, we obtain the production cross-section per nucleon $σ(J/ψ)/A$ including the branching ratios of $J/ψ$ decays into muons, $B_{μμ}$: $B_{μμ}σ(J/ψ)/A=(1.18~\pm~0.04~\pm~0.10)~\rm{nb}$/nucleon. This is to be compared to the NA50 extrapolated result (using a much thinner target): $B_{μμ}σ(J/ψ)/A=(0.99~\pm~0.04)~\rm{nb}$/nucleon. Within the systematic errors, no significant enhancement due to secondary production of $J/ψ$ inside the target is observed. An upper limit of possible contributions from cascade collisions of $<32\%$ is obtained. |
| title | Measurement of di-muons from 400 GeV/c protons interacting in a thick molybdenum/tungsten target |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2604.03661 |