Interdependence of the new 'MUON G-2' result and the W-boson mass
| Autor: | Bagnaschi, E., Chakraborti, M., Heinemeyer, S., Saha, I., Weiglein, G. |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Planck
electroweak interaction: precision measurement neutralino: mass Physics and Astronomy (miscellaneous) chargino: mass FOS: Physical sciences chargino GeV W: mass: measured ILC Coll Brookhaven Lab mass [smuon] High Energy Physics - Phenomenology (hep-ph) neutralino smuon: mass magnetic moment [muon] precision measurement [electroweak interaction] ddc:530 sparticle Engineering (miscellaneous) mass [chargino] Particle Physics - Phenomenology muon: magnetic moment muon magnetic moment electroweak interaction new physics High Energy Physics::Phenomenology smuon minimal supersymmetric standard model slepton hep-ph High Energy Physics - Phenomenology magnetic moment: anomaly High Energy Physics::Experiment supersymmetry anomaly [magnetic moment] mass [neutralino] mass: measured [W] dark matter density experimental results |
| Zdroj: | European Physical Journal The European physical journal / C 82(5), 474 (2022). doi:10.1140/epjc/s10052-022-10402-0 |
| DOI: | 10.3204/PUBDB-2022-01418 |
| Popis: | The European physical journal / C 82(5), 474 (2022). doi:10.1140/epjc/s10052-022-10402-0 The electroweak (EW) sector of the Minimal Supersymmetric extension of the Standard Model (MSSM), assuming the lightest neutralino as Dark Matter (DM) candidate, can account for a variety of experimental results. This includes the DM direct detection limits, the searches for EW superpartners at the LHC, and in particular the discrepancy between the experimental result for the anomalous magnetic moment of the muon, $(g-2)_\mu $, and its Standard Model (SM) prediction. The new “MUON G-2” result, combined with the older BNL result on $(g-2)_\mu $, yields a deviation from the SM prediction of $\Delta a_\mu = ({25.1}\pm {5.9}) \times 10^{-10}$, corresponding to ${4.2}\,\sigma $. Using this updated bound, together with the other constraints, we calculate the MSSM prediction for the mass of the W boson, $M_W$. We assume contributions only from the EW sector, i.e. the colored sector of the MSSM, in agreement with the search limits, is taken to be heavy. We investigate five scenarios, distinguished by the mechanisms which yield a relic DM density in agreement with the latest Planck bounds. We find that with the new $(g-2)_\mu $ result taken into account and depending on the scenario, values up to are reached. The largest values are obtained for wino DM and in the case of slepton co-annihilation, where points well within the $1\,\sigma $ range of the experimental world average of $M_W^{\mathrm {exp}}= 80.379 \pm 0.012 \,\, \mathrm {GeV}$ are reached, whereas the SM predicts a too small value of $M_W^{\mathrm {SM}}= 80.353 \,\, \mathrm {GeV}$. We analyze the dependence of $M_W^{\mathrm {MSSM}}$ on the relevant masses of the EW superpartners and demonstrate that future $M_W$ measurements, e.g. at the ILC, could distinguish between various MSSM realizations. Sizable contributions to $M_W^{\mathrm {MSSM}}$ are associated with a relatively light $\tilde{\chi }_{1}^0$, accompanied by either a light chargino or a light smuon, setting interesting targets for future collider searches. Published by Springer, Heidelberg |
| Databáze: | OpenAIRE |
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