Inclusive $ψ(2S)$ production at midrapidity in pp collisions at $\sqrt{s} = 13$ TeV
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866910033830215680 |
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| author | ALICE Collaboration |
| author_facet | ALICE Collaboration |
| contents | Inclusive production of $ψ(2S)$ mesons is measured for the first time at midrapidity ($|y| < 0.9$) in pp collisions at $\sqrt{s} = 13$ TeV using the ALICE detector at the LHC. The measurement is performed in the transverse-momentum ($p_{\rm T}$) range of 4 to 16 GeV/$c$ and is based on events triggered by the Transition Radiation Detector, corresponding to an integrated luminosity of $1.7 \pm 1.8\%$ (syst.) pb$^{-1}$. The $p_{\rm T}$-differential production cross section of the $ψ(2S)$ and its ratio to the J/$ψ$ production cross section are presented. The results extend the accessible $p_{\rm T}$ range down to 4 GeV/$c$, and a mild rise of the $ψ(2S)$-to-J/$ψ$ cross section ratio with increasing $p_{\rm T}$ is observed. The measurements are compared with theoretical predictions based on NRQCD and the ICEM model. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_22848 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Inclusive $ψ(2S)$ production at midrapidity in pp collisions at $\sqrt{s} = 13$ TeV ALICE Collaboration High Energy Physics - Experiment Nuclear Experiment Inclusive production of $ψ(2S)$ mesons is measured for the first time at midrapidity ($|y| < 0.9$) in pp collisions at $\sqrt{s} = 13$ TeV using the ALICE detector at the LHC. The measurement is performed in the transverse-momentum ($p_{\rm T}$) range of 4 to 16 GeV/$c$ and is based on events triggered by the Transition Radiation Detector, corresponding to an integrated luminosity of $1.7 \pm 1.8\%$ (syst.) pb$^{-1}$. The $p_{\rm T}$-differential production cross section of the $ψ(2S)$ and its ratio to the J/$ψ$ production cross section are presented. The results extend the accessible $p_{\rm T}$ range down to 4 GeV/$c$, and a mild rise of the $ψ(2S)$-to-J/$ψ$ cross section ratio with increasing $p_{\rm T}$ is observed. The measurements are compared with theoretical predictions based on NRQCD and the ICEM model. |
| title | Inclusive $ψ(2S)$ production at midrapidity in pp collisions at $\sqrt{s} = 13$ TeV |
| topic | High Energy Physics - Experiment Nuclear Experiment |
| url | https://arxiv.org/abs/2602.22848 |