The origin of proton mass from J/$${\Psi }$$ Ψ photo-production data
Abstract The trace of the stress tensor characterizes the transformation of a theory under rescaling. In quantum chromodynamics (QCD), this trace contains contributions from the bare masses of the quarks and also from a purely quantum effect, called the QCD trace anomaly. It affects all masses in th...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2020-06-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-020-8057-9 |
| _version_ | 1830490918348652544 |
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| author | Rong Wang Xurong Chen Jarah Evslin |
| author_facet | Rong Wang Xurong Chen Jarah Evslin |
| author_sort | Rong Wang |
| collection | DOAJ |
| description | Abstract The trace of the stress tensor characterizes the transformation of a theory under rescaling. In quantum chromodynamics (QCD), this trace contains contributions from the bare masses of the quarks and also from a purely quantum effect, called the QCD trace anomaly. It affects all masses in the theory. We present an estimation of the QCD trace anomaly from the near-threshold $$\hbox {J}/{\Psi }$$ J/Ψ photo-production data of the GlueX experiment, at JLab. We apply a vector meson dominance model to describe the photo-production of $$\hbox {J}/{\Psi }$$ J/Ψ and a running strong coupling which includes the nonperturbative effects in the low $$\mu ^2$$ μ2 region. Despite the large uncertainty, we find that the experimental data favors a small value of the trace anomaly parameter $$b=0.07\pm 0.17$$ b=0.07±0.17 . We report the resulting proton mass decompositions at $$\mu ^2=0.41\hbox { GeV}^2$$ μ2=0.41GeV2 and $$\mu ^2=4\hbox { GeV}^2$$ μ2=4GeV2 . |
| first_indexed | 2024-12-21T20:01:43Z |
| format | Article |
| id | doaj.art-c1b8ed69e1fc4eb8b8db60ffe3ef242e |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-21T20:01:43Z |
| publishDate | 2020-06-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-c1b8ed69e1fc4eb8b8db60ffe3ef242e2022-12-21T18:51:58ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522020-06-018061610.1140/epjc/s10052-020-8057-9The origin of proton mass from J/$${\Psi }$$ Ψ photo-production dataRong Wang0Xurong Chen1Jarah Evslin2Institute of Modern Physics, Chinese Academy of SciencesInstitute of Modern Physics, Chinese Academy of SciencesInstitute of Modern Physics, Chinese Academy of SciencesAbstract The trace of the stress tensor characterizes the transformation of a theory under rescaling. In quantum chromodynamics (QCD), this trace contains contributions from the bare masses of the quarks and also from a purely quantum effect, called the QCD trace anomaly. It affects all masses in the theory. We present an estimation of the QCD trace anomaly from the near-threshold $$\hbox {J}/{\Psi }$$ J/Ψ photo-production data of the GlueX experiment, at JLab. We apply a vector meson dominance model to describe the photo-production of $$\hbox {J}/{\Psi }$$ J/Ψ and a running strong coupling which includes the nonperturbative effects in the low $$\mu ^2$$ μ2 region. Despite the large uncertainty, we find that the experimental data favors a small value of the trace anomaly parameter $$b=0.07\pm 0.17$$ b=0.07±0.17 . We report the resulting proton mass decompositions at $$\mu ^2=0.41\hbox { GeV}^2$$ μ2=0.41GeV2 and $$\mu ^2=4\hbox { GeV}^2$$ μ2=4GeV2 .http://link.springer.com/article/10.1140/epjc/s10052-020-8057-9 |
| spellingShingle | Rong Wang Xurong Chen Jarah Evslin The origin of proton mass from J/$${\Psi }$$ Ψ photo-production data European Physical Journal C: Particles and Fields |
| title | The origin of proton mass from J/$${\Psi }$$ Ψ photo-production data |
| title_full | The origin of proton mass from J/$${\Psi }$$ Ψ photo-production data |
| title_fullStr | The origin of proton mass from J/$${\Psi }$$ Ψ photo-production data |
| title_full_unstemmed | The origin of proton mass from J/$${\Psi }$$ Ψ photo-production data |
| title_short | The origin of proton mass from J/$${\Psi }$$ Ψ photo-production data |
| title_sort | origin of proton mass from j psi ψ photo production data |
| url | http://link.springer.com/article/10.1140/epjc/s10052-020-8057-9 |
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