Potential of the reaction $e^+e^-\to p\bar{p}π^0$ for constructing higher $ρ$-meson spectroscopy above 2.4 GeV
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
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2025
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| _version_ | 1866909779186679808 |
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| author | Guo, Dan Wang, Jun-Zhang Zhou, Qin-Song |
| author_facet | Guo, Dan Wang, Jun-Zhang Zhou, Qin-Song |
| contents | The spectrum of light unflavored vector mesons above 2.4 GeV has not yet been firmly established experimentally. In this work, we demonstrate that the process $e^+e^- \to p\bar{p}π$ serves as a particularly promising channel as a probe for higher isovector $ρ$ excitations. In contrast to typical electron-positron annihilation processes into purely light-meson final states, the reaction $e^+e^- \to p\bar{p}π$ benefits from a relatively low continuum background, on the order of $(50\sim100)~\text{pb}$ around 2.4 GeV, which enhances the visibility of even modest resonance contributions. In addition, the comparatively high production threshold further suppresses potential contamination from lower $ρ$-meson excitations. Our analysis based on effective Lagrangian approach indicates that the observed lineshape of the $e^+e^- \to p\bar{p}π$ cross section measured by BESIII can be naturally interpreted by including the $ρ(5S)$ and $ρ(6S)$ contributions, namely the fourth and fifth radial excitations of $ρ(770)$. In particular, the pronounced rise of the cross section near 2.4 GeV provides strong evidence for the contribution of $ρ(5S)$ signal. Their branching ratios to the $p\bar{p}π$ final state are found to be below 4\%, which do not contradict with usual expectations. In addition, we evaluate pion-induced production of these two $ρ$-meson states as a complementary probe, offering useful guidance for the relevant experiments such as COMPASS. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_07821 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Potential of the reaction $e^+e^-\to p\bar{p}π^0$ for constructing higher $ρ$-meson spectroscopy above 2.4 GeV Guo, Dan Wang, Jun-Zhang Zhou, Qin-Song High Energy Physics - Phenomenology The spectrum of light unflavored vector mesons above 2.4 GeV has not yet been firmly established experimentally. In this work, we demonstrate that the process $e^+e^- \to p\bar{p}π$ serves as a particularly promising channel as a probe for higher isovector $ρ$ excitations. In contrast to typical electron-positron annihilation processes into purely light-meson final states, the reaction $e^+e^- \to p\bar{p}π$ benefits from a relatively low continuum background, on the order of $(50\sim100)~\text{pb}$ around 2.4 GeV, which enhances the visibility of even modest resonance contributions. In addition, the comparatively high production threshold further suppresses potential contamination from lower $ρ$-meson excitations. Our analysis based on effective Lagrangian approach indicates that the observed lineshape of the $e^+e^- \to p\bar{p}π$ cross section measured by BESIII can be naturally interpreted by including the $ρ(5S)$ and $ρ(6S)$ contributions, namely the fourth and fifth radial excitations of $ρ(770)$. In particular, the pronounced rise of the cross section near 2.4 GeV provides strong evidence for the contribution of $ρ(5S)$ signal. Their branching ratios to the $p\bar{p}π$ final state are found to be below 4\%, which do not contradict with usual expectations. In addition, we evaluate pion-induced production of these two $ρ$-meson states as a complementary probe, offering useful guidance for the relevant experiments such as COMPASS. |
| title | Potential of the reaction $e^+e^-\to p\bar{p}π^0$ for constructing higher $ρ$-meson spectroscopy above 2.4 GeV |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2509.07821 |