TY - JOUR
T1 - Singlet extensions and W boson mass in light of the CDF II result
AU - Sakurai, Kodai
AU - Takahashi, Fuminobu
AU - Yin, Wen
N1 - Funding Information:
This work was supported by JSPS Core-to-Core Program (grant number: JPJSCCA20200002 ) (F.T.), JSPS KAKENHI Grant Nos. 20H01894 (K.S. and F.T.) 20H05851 (F.T. and W.Y.), 21K20363 (K.S.), 21K20364 (W.Y.), 22K14029 (W.Y.), and 22H01215 (W.Y.).
Publisher Copyright:
© 2022 The Author(s)
PY - 2022/10/10
Y1 - 2022/10/10
N2 - Recently, the CDF collaboration has reported the precise measurement of the W boson mass, MW=80433.5±9.4MeV, based on 8.8 fb−1 of s=1.96 TeV pp¯ collision data from the CDF II detector at the Fermilab Tevatron. This is about 7σ away from the Standard Model prediction, MWSM=80357±6MeV. Such a large discrepancy may be partially due to exotic particles that radiatively alter the relation between the W and Z boson masses. In this Letter, we study singlet extensions of the Standard Model focusing on the shift of the W boson mass since they are accidentally flavor and CP safe without changing the Standard Model structure. In the minimal extension with a real singlet field, using the bounds from the electroweak oblique parameters, B meson decays, LEP, and LHC, we find that the W boson mass shift is at most a few MeV, and therefore it does not alleviate the tension between the CDF II result and the SM prediction. We then examine how much various bounds are relaxed when the singlet is allowed to decay invisibly, and find that the increase of the W boson mass does not exceed 5 MeV due to the bound from the Higgs signal strength. We also discuss phenomenological and cosmological implications of the singlet extensions such as the muon g−2 anomaly, axion/hidden photon dark matter, and self-interacting dark radiation as a possible alleviation of the Hubble tension.
AB - Recently, the CDF collaboration has reported the precise measurement of the W boson mass, MW=80433.5±9.4MeV, based on 8.8 fb−1 of s=1.96 TeV pp¯ collision data from the CDF II detector at the Fermilab Tevatron. This is about 7σ away from the Standard Model prediction, MWSM=80357±6MeV. Such a large discrepancy may be partially due to exotic particles that radiatively alter the relation between the W and Z boson masses. In this Letter, we study singlet extensions of the Standard Model focusing on the shift of the W boson mass since they are accidentally flavor and CP safe without changing the Standard Model structure. In the minimal extension with a real singlet field, using the bounds from the electroweak oblique parameters, B meson decays, LEP, and LHC, we find that the W boson mass shift is at most a few MeV, and therefore it does not alleviate the tension between the CDF II result and the SM prediction. We then examine how much various bounds are relaxed when the singlet is allowed to decay invisibly, and find that the increase of the W boson mass does not exceed 5 MeV due to the bound from the Higgs signal strength. We also discuss phenomenological and cosmological implications of the singlet extensions such as the muon g−2 anomaly, axion/hidden photon dark matter, and self-interacting dark radiation as a possible alleviation of the Hubble tension.
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U2 - 10.1016/j.physletb.2022.137324
DO - 10.1016/j.physletb.2022.137324
M3 - Article
AN - SCOPUS:85143856197
SN - 0370-2693
VL - 833
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
M1 - 137324
ER -