Photo-production of $η_{c,b}$ near Threshold
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arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866916439472996352 |
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| author | Liu, Wei-Yang Zahed, Ismail |
| author_facet | Liu, Wei-Yang Zahed, Ismail |
| contents | We analyze the photo-production of $η_{c,b}$ off a proton in the threshold region, in terms of C-odd gluonic correlations in the off-forward proton matrix element. Near threshold, the skewness is large leading to a production amplitude that is dominated by four C-odd twist-3 gluon GPDs. We use the QCD instanton vacuum to estimate these C-odd contributions in the proton. The results are used to estimate the differential cross sections for coherent photo-production of $η_{c,b}$ in the threshold region, at current electron facilities. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_03875 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Photo-production of $η_{c,b}$ near Threshold Liu, Wei-Yang Zahed, Ismail High Energy Physics - Phenomenology Nuclear Theory We analyze the photo-production of $η_{c,b}$ off a proton in the threshold region, in terms of C-odd gluonic correlations in the off-forward proton matrix element. Near threshold, the skewness is large leading to a production amplitude that is dominated by four C-odd twist-3 gluon GPDs. We use the QCD instanton vacuum to estimate these C-odd contributions in the proton. The results are used to estimate the differential cross sections for coherent photo-production of $η_{c,b}$ in the threshold region, at current electron facilities. |
| title | Photo-production of $η_{c,b}$ near Threshold |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2404.03875 |