Constraining kaon PDFs from Drell-Yan and $J/ψ$ production
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866910505217556480 |
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| author | Chang, Wen-Chen Peng, Jen-Chieh Platchkov, Stephane Sawada, Takahiro |
| author_facet | Chang, Wen-Chen Peng, Jen-Chieh Platchkov, Stephane Sawada, Takahiro |
| contents | The kaon parton distribution functions (PDFs) are poorly known due to paucity of kaon-induced Drell-Yan data. Nevertheless, these Drell-Yan data suggest a softer valence $u$ quark distribution of kaon than that of pion. We discuss the opportunity to constrain kaon PDFs utilizing existing kaon-induced $J/ψ$ production data. We compare the $K^- / π^-$ and $K^+ / π^+$ cross-section ratio data with calculations based on two global-fit parametrizations and two recent theoretical predictions for the kaon and pion PDFs, and test the results with two quarkonium production models. The $K^- / π^-$ cross-section ratio for $J/ψ$ production provides independent evidence of different valence quark distributions in pion and kaon. The $K^+ / π^+$ $J/ψ$ data are found to be sensitive to the gluon distribution in kaon. We show that these $J/ψ$ production data provide valuable constraints for evaluating the adequacy of currently available sets of kaon PDFs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_02860 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Constraining kaon PDFs from Drell-Yan and $J/ψ$ production Chang, Wen-Chen Peng, Jen-Chieh Platchkov, Stephane Sawada, Takahiro High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory The kaon parton distribution functions (PDFs) are poorly known due to paucity of kaon-induced Drell-Yan data. Nevertheless, these Drell-Yan data suggest a softer valence $u$ quark distribution of kaon than that of pion. We discuss the opportunity to constrain kaon PDFs utilizing existing kaon-induced $J/ψ$ production data. We compare the $K^- / π^-$ and $K^+ / π^+$ cross-section ratio data with calculations based on two global-fit parametrizations and two recent theoretical predictions for the kaon and pion PDFs, and test the results with two quarkonium production models. The $K^- / π^-$ cross-section ratio for $J/ψ$ production provides independent evidence of different valence quark distributions in pion and kaon. The $K^+ / π^+$ $J/ψ$ data are found to be sensitive to the gluon distribution in kaon. We show that these $J/ψ$ production data provide valuable constraints for evaluating the adequacy of currently available sets of kaon PDFs. |
| title | Constraining kaon PDFs from Drell-Yan and $J/ψ$ production |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2402.02860 |