Abstract—
The review presents the experiments performed with the KEDR detector at the \({{e}^{ + }}{{e}^{ - }}\) collider VEPP-4M in the energy range of \(\sqrt s \) = 1.84–3.88 GeV. The cross section of \({{e}^{ + }}{{e}^{ - }}\) annihilation to hadrons was measured at 22 points of this range and the search for narrow resonances was conducted below 3.1 GeV. The masses of \({J \mathord{\left/ {\vphantom {J \psi }} \right. \kern-0em} \psi }\) and \(\psi (2S)\) mesons were measured with a record accuracy better than \(3 \times {{10}^{{ - 6}}}\); their partial and total widths were determined. Measurements of the tau lepton mass and masses of charged and neutral \(D\) mesons were performed with high precision. The measurements of the \(\psi (3770)\) parameters are discussed, and attention is drawn to some inconsistency of the procedure employed by the Particle Data Group for determining its parameters.
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ACKNOWLEDGMENTS
We thank the employees of the acceleration complex VEPP-4M, experimental laboratories, other BINP divisions, who made possible unique experiments with the KEDR detector which resulted in important results in elementary particle physics.
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APPENDIX
APPENDIX
1.1 LIST OF MAIN RESULTS OF EXPERIMENTS WITH THE KEDR DETECTOR AT THE VEPP-4M COLLIDER
1. \({J \mathord{\left/ {\vphantom {J \psi }} \right. \kern-0em} \psi }\) meson parameters
1* | Mass = \(3096.900 \pm 0.002 \pm 0.006\) MeV | [23] |
2 | \({{\Gamma }_{{ee}}} \times {{\mathcal{B}}_{{\mu \mu }}}\) = \(331.8 \pm 5.2 \pm 6.3\) eV | [44] |
3* | \({{\Gamma }_{{ee}}} \times {{\mathcal{B}}_{{ee}}}\) = \(333.1 \pm 6.6 \pm 4.0\) eV | [38] |
4* | \({{\Gamma }_{{ee}}} \times {{\mathcal{B}}_{{\text{h}}}}\) = \(4.884 \pm 0.048 \pm 0.078\) keV | [38] |
5* | \({{\Gamma }_{{ee}}}\) = \(5.550 \pm 0.056 \pm 0.089\) keV | [38] |
6* | \(\Gamma \) = \(92.45 \pm 1.40 \pm 1.48\) keV | [49] |
7* | \({{\Gamma }_{{\text{h}}}}\) = \(81.37 \pm 1.36 \pm 1.30\) keV | [49] |
8 | \(\Gamma _{{\gamma {{\eta }_{c}}}}^{0}\) = \(2.98 \pm 0.18_{{ - 0.33}}^{{ + 0.15}}\) keV | [55] |
9* | \({{{{\Gamma }_{{ee}}}} \mathord{\left/ {\vphantom {{{{\Gamma }_{{ee}}}} {{{\Gamma }_{{\mu \mu }}}}}} \right. \kern-0em} {{{\Gamma }_{{\mu \mu }}}}}\) = \(1.0022 \pm 0.0044 \pm 0.0048\) | [47] |
2. \({{\eta }_{c}}\) meson parameters
3. \(\psi (2S)\) meson parameters
1* | Mass = \(3686.099 \pm 0.004 \pm 0.009\) MeV | [23] |
2 | \({{\Gamma }_{{ee}}}\) = \(2.282 \pm 0.015 \pm 0.042\) keV | [39] |
3 | \(\Gamma \) = \(296 \pm 2 \pm 8 \pm 3\) keV | [34] |
4* | \({{\Gamma }_{{ee}}} \times {{\mathcal{B}}_{{\text{h}}}}\) = \(2.233 \pm 0.015 \pm 0.037 \pm 0.020\) keV | [34] |
5* | \({{\Gamma }_{{ee}}} \times {{\mathcal{B}}_{{ee}}}\) = \(21.2 \pm 0.7 \pm 1.2\) eV | [39] |
6* | \({{\Gamma }_{{ee}}} \times {{\mathcal{B}}_{{\mu \mu }}}\) = \(19.3 \pm 0.3 \pm 0.5\) eV | [39] |
7* | \({{\Gamma }_{{ee}}} \times {{\mathcal{B}}_{{\tau \tau }}}\) = \(9.0 \pm 2.6\) eV | [28] |
4. \(\psi (3770)\) meson parameters from joint analysis of data from five experiments
5. τ lepton mass
1 | \({{M}_{\tau }}\) = \(1776.69_{{ - 0.19}}^{{ + 0.17}} \pm 0.15\) MeV | [5] |
6. D meson masses
7. Search of narrow resonances in the range \(\sqrt s \) = 1.85–3.1 GeV
1* | \(\Gamma _{{ee}}^{R} \times {{\mathcal{B}}_{{\text{h}}}} < \) 120 eV, with 90% confidence level | [95] |
8. R measurement in the region of \(\sqrt s \) between 1.84 and 3.72 GeV
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Anashin, V.V., Anchugov, O.V., Aulchenko, V.M. et al. Experiments with the KEDR Detector at the \({{e}^{ + }}{{e}^{ - }}\) Collider VEPP-4M in the Energy Range \(\sqrt s \) = 1.84–3.88 GeV. Phys. Part. Nuclei 54, 185–226 (2023). https://doi.org/10.1134/S1063779623010033
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DOI: https://doi.org/10.1134/S1063779623010033