First Kaonic Boron Isotopes Measurements with SIDDHARTA-2 at DA$Φ$NE
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2026
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| author | Sirghi, D Iliescu, M Sgaramella, F Abbene, L Amsler, C Artibani, F Bazzi, M Borghi, G Bosnar, D Bragadireanu, M Buttacavoli, A Carminati, M Clozza, A Clozza, F De Paolis, L Del Grande, R Dulski, K Fiorini, C Friščić, I Guaraldo, C Indelicato, P Iwasaki, M Khreptak, A Manti, S Marton, J Moskal, P Ohnishi, H Piscicchia, K Principato, F Scordo, A Silarski, M Sirghi, F Skurzok, M Spallone, A Toho, K Doce, O Vazquez Zmeskal, J Curceanu, C |
| author_facet | Sirghi, D Iliescu, M Sgaramella, F Abbene, L Amsler, C Artibani, F Bazzi, M Borghi, G Bosnar, D Bragadireanu, M Buttacavoli, A Carminati, M Clozza, A Clozza, F De Paolis, L Del Grande, R Dulski, K Fiorini, C Friščić, I Guaraldo, C Indelicato, P Iwasaki, M Khreptak, A Manti, S Marton, J Moskal, P Ohnishi, H Piscicchia, K Principato, F Scordo, A Silarski, M Sirghi, F Skurzok, M Spallone, A Toho, K Doce, O Vazquez Zmeskal, J Curceanu, C |
| contents | A precision measurement of X-ray transitions in kaonic boron, performed by the SIDDHARTA-2 collaboration at the DA$Φ$NE collider, is reported. The energies and yields of the $5g\rightarrow4f$ and $4f\rightarrow3d$ transitions were determined for both boron isotopes, kaonic $^{10}\text{B}$ and kaonic $^{11}\text{B}$. For the $5g\rightarrow4f$ transition, the measured energies are $7064.62 \pm 16.93\,\text{(stat.)} \pm 2.00\,\text{(sys.)}$~eV for kaonic $^{11}\text{B}$ and $6920.96 \pm 58.23\,\text{(stat.)} \pm 2.00\,\text{(sys.)}$~eV for kaonic $^{10}\text{B}$. For the $4f\rightarrow3d$ transition, the corresponding values are $15293.33 \pm 4.80\,\text{(stat.)} \pm 5.30\,\text{(sys.)}$~eV and $15180.11 \pm 20.86\,\text{(stat.)} \pm 5.30\,\text{(sys.)}$~eV, respectively. The yields for the $5g\rightarrow4f$ transition are $0.076 \pm 0.013\,\text{(stat.)}^{+0.011}_{-0.012}\,\text{(sys.)}$ for kaonic $^{11}\text{B}$ and $0.0189 \pm 0.0032\,\text{(stat.)}^{+0.0028}_{-0.0030}\,\text{(sys.)}$ for kaonic $^{10}\text{B}$. For the $4f\rightarrow3d$ transition, the corresponding yields are $0.115 \pm 0.006\,\text{(stat.)}^{+0.002}_{-0.005}\,\text{(sys.)}$ and $0.0286 \pm 0.0015\,\text{(stat.)}^{+0.0007}_{-0.0014}\,\text{(sys.)}$, respectively. No statistically significant deviation from pure electromagnetic (QED) calculations is observed in the measurement of the $4f\rightarrow3d$ X-ray transition in kaonic $^{11}\text{B}$. Interpreted as upper limits, these results impose stringent constraints on the strong-interaction energy shift and width of the 3d level in light nuclei. Translating these limits into bounds on phenomenological kaon-nucleus optical potentials and, within specific theoretical models, on the complex scattering amplitude, we constrain and disfavor scenarios that predict large shifts or widths in boron. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_26979 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | First Kaonic Boron Isotopes Measurements with SIDDHARTA-2 at DA$Φ$NE Sirghi, D Iliescu, M Sgaramella, F Abbene, L Amsler, C Artibani, F Bazzi, M Borghi, G Bosnar, D Bragadireanu, M Buttacavoli, A Carminati, M Clozza, A Clozza, F De Paolis, L Del Grande, R Dulski, K Fiorini, C Friščić, I Guaraldo, C Indelicato, P Iwasaki, M Khreptak, A Manti, S Marton, J Moskal, P Ohnishi, H Piscicchia, K Principato, F Scordo, A Silarski, M Sirghi, F Skurzok, M Spallone, A Toho, K Doce, O Vazquez Zmeskal, J Curceanu, C Nuclear Experiment A precision measurement of X-ray transitions in kaonic boron, performed by the SIDDHARTA-2 collaboration at the DA$Φ$NE collider, is reported. The energies and yields of the $5g\rightarrow4f$ and $4f\rightarrow3d$ transitions were determined for both boron isotopes, kaonic $^{10}\text{B}$ and kaonic $^{11}\text{B}$. For the $5g\rightarrow4f$ transition, the measured energies are $7064.62 \pm 16.93\,\text{(stat.)} \pm 2.00\,\text{(sys.)}$~eV for kaonic $^{11}\text{B}$ and $6920.96 \pm 58.23\,\text{(stat.)} \pm 2.00\,\text{(sys.)}$~eV for kaonic $^{10}\text{B}$. For the $4f\rightarrow3d$ transition, the corresponding values are $15293.33 \pm 4.80\,\text{(stat.)} \pm 5.30\,\text{(sys.)}$~eV and $15180.11 \pm 20.86\,\text{(stat.)} \pm 5.30\,\text{(sys.)}$~eV, respectively. The yields for the $5g\rightarrow4f$ transition are $0.076 \pm 0.013\,\text{(stat.)}^{+0.011}_{-0.012}\,\text{(sys.)}$ for kaonic $^{11}\text{B}$ and $0.0189 \pm 0.0032\,\text{(stat.)}^{+0.0028}_{-0.0030}\,\text{(sys.)}$ for kaonic $^{10}\text{B}$. For the $4f\rightarrow3d$ transition, the corresponding yields are $0.115 \pm 0.006\,\text{(stat.)}^{+0.002}_{-0.005}\,\text{(sys.)}$ and $0.0286 \pm 0.0015\,\text{(stat.)}^{+0.0007}_{-0.0014}\,\text{(sys.)}$, respectively. No statistically significant deviation from pure electromagnetic (QED) calculations is observed in the measurement of the $4f\rightarrow3d$ X-ray transition in kaonic $^{11}\text{B}$. Interpreted as upper limits, these results impose stringent constraints on the strong-interaction energy shift and width of the 3d level in light nuclei. Translating these limits into bounds on phenomenological kaon-nucleus optical potentials and, within specific theoretical models, on the complex scattering amplitude, we constrain and disfavor scenarios that predict large shifts or widths in boron. |
| title | First Kaonic Boron Isotopes Measurements with SIDDHARTA-2 at DA$Φ$NE |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2605.26979 |