First simultaneous global QCD analysis of kaon and pion parton distributions with lattice QCD constraints
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2025
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866915553049837568 |
|---|---|
| author | Barry, P. C. Ji, Chueng-Ryong Melnitchouk, W. Sato, N. Steffens, Fernanda |
| author_facet | Barry, P. C. Ji, Chueng-Ryong Melnitchouk, W. Sato, N. Steffens, Fernanda |
| contents | We perform the first simultaneous global QCD analysis of pion and kaon parton distribution functions (PDFs), constrained by pion- and kaon-induced Drell-Yan (DY) and leading neutron electroproduction data, together with lattice QCD data on pion and kaon PDF moments. The analysis indicates a softer valence $\bar u$ distribution in the $K^-$ than in the $π^-$, and a significantly more peaked valence $s$-quark density in $K^-$ compared with the $\bar u$. The effective exponent governing the high-$x$ behavior of the PDF is found to be larger for $\bar u$ in the kaon, $β_{\bar u}^{K^-}\!= 1.6(2)$, than in the pion, $β_{\bar u}^{π^-}\!= 1.16(4)$, in the range $0.7 \leq x \leq 0.95$. From the gluon momentum fractions we find the pion's gluon content accounts for $\approx 1/3$ of the mass budget of the pion at $μ=2~{\rm GeV}$, but only $\approx 1/4$ for the kaon. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_11979 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | First simultaneous global QCD analysis of kaon and pion parton distributions with lattice QCD constraints Barry, P. C. Ji, Chueng-Ryong Melnitchouk, W. Sato, N. Steffens, Fernanda High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice Nuclear Theory We perform the first simultaneous global QCD analysis of pion and kaon parton distribution functions (PDFs), constrained by pion- and kaon-induced Drell-Yan (DY) and leading neutron electroproduction data, together with lattice QCD data on pion and kaon PDF moments. The analysis indicates a softer valence $\bar u$ distribution in the $K^-$ than in the $π^-$, and a significantly more peaked valence $s$-quark density in $K^-$ compared with the $\bar u$. The effective exponent governing the high-$x$ behavior of the PDF is found to be larger for $\bar u$ in the kaon, $β_{\bar u}^{K^-}\!= 1.6(2)$, than in the pion, $β_{\bar u}^{π^-}\!= 1.16(4)$, in the range $0.7 \leq x \leq 0.95$. From the gluon momentum fractions we find the pion's gluon content accounts for $\approx 1/3$ of the mass budget of the pion at $μ=2~{\rm GeV}$, but only $\approx 1/4$ for the kaon. |
| title | First simultaneous global QCD analysis of kaon and pion parton distributions with lattice QCD constraints |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice Nuclear Theory |
| url | https://arxiv.org/abs/2510.11979 |