Unified explanation of the anomalies in semileptonic 
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 decays and the 
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 mass

Algueró, Marcel; Matias, Joaquim; Crivellin, Andreas; Manzari, Claudio Andrea

doi:10.1103/physrevd.106.033005

Cited by 21 publications

(1 citation statement)

References 122 publications

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“…The tension in the 𝑊 mass is most easily explained by tree-level effect, e.g. an 𝑆𝑈 (2) 𝐿 scalar triplet that acquires a vacuum expectation value [140] or via 𝑍 − 𝑍 ′ mixing in case 𝑍 ′ is an 𝑆𝑈 (2) 𝐿 singlet [139]. However, also loop effects of new particles with masses below the TeV scale are possible [140].…”

Section: 𝒎 𝑾mentioning

confidence: 99%

Anomalies in Particle Physics

Crivellin

2024

Proceedings of 8th Symposium on Prospects in the Physics of Discrete Symmetries — PoS(DISCRETE2022)

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I provide a (personal) review of the current hints for physics beyond the Standard Model, called "anomalies", obtained both at the intensity frontier (flavour and electroweak precision observables) and in direct LHC searches. This includes the deviations from the Standard Model predictions in semi-leptonic 𝐵 decays, the anomalous magnetic moment of the muon, the Cabibbo Angle Anomaly, the 𝑊 mass as well as non-resonant di-lepton searches, the hints for new scalar particles around ≈ 95 GeV, ≈ 151 GeV, ≈ 670 GeV and the (di-)di-jet excess at ≈ 1 TeV (≈ 3.6 TeV). Possible explanations in terms of new particles are briefly summarized and discussed.

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Section: 𝒎 𝑾mentioning

confidence: 99%

Anomalies in Particle Physics

Crivellin

2024

Proceedings of 8th Symposium on Prospects in the Physics of Discrete Symmetries — PoS(DISCRETE2022)

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Renormalization of a Standard Model extension with a Dark Abelian Sector and predictions for the W-boson mass

Dittmaier,

Rehberg,

Rzehak

2024

J. High Energ. Phys.

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The described Dark Abelian Sector Model (DASM) extends the Standard Model (SM) by a “dark” sector containing a spontaneously broken U(1)d gauge group. Keeping this dark sector quite generic we only add one additional Higgs boson, one Dirac fermion, and right-handed SM-like neutrinos to the SM. Using the only two singlet operators of the SM with dimension less than 4 (the U(1)Y field-strength tensor and the SM Higgs mass operator |Φ|2) as well as the right-handed neutrino fields we open up three portals to the dark sector. Dark sectors, such as the one of the DASM, that introduce an additional Higgs boson H as well as an additional Z′ gauge boson can have a large influence on the predictions for electroweak precision observables and even accommodate possible dark matter candidates. We consider one of the two Higgs bosons to be the known 125 GeV Higgs boson and parameterize the extension of the scalar sector by the mass of the second Higgs boson, the Higgs mixing angle, and a Higgs self-coupling. We do not assume any mass hierarchy in the gauge sector and use the mass of the additional Z′ boson and a corresponding gauge-boson mixing angle to parameterize the extension of the gauge sector. The fermion sector is parameterized by the mass of the additional fermion and a fermion mixing angle. We describe an on-shell as well as an $$ \overline{\textrm{MS}} $$ MS ¯ renormalization scheme for the DASM sectors and give explicit results for the renormalization constants at the 1-loop level, and, thus, prepare the ground for full NLO predictions for collider observables in the DASM. As a first example, we provide the DASM prediction for the W-boson mass derived from muon decay.

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B meson anomalies and large $$ {B}^{+}\to {K}^{+}\nu \overline{\nu} $$ in non-universal U(1)′ models

Athron,

Martinez,

Sierra

2024

J. High Energ. Phys.

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In view of both the latest LHCb measurement of $$ {R}_{K^{\left(\ast \right)}} $$ R K ∗ and the new 2.7σ deviation reported by Belle II on $$ {B}^{+}\to {K}^{+}\nu \overline{\nu} $$ B + → K + ν ν ¯ decays, we present a fit to the B meson anomalies for various one and two dimensional hypothesis including complex Wilson coefficients. We show in a model-independent way that the generic non-universal U(1)′ extensions of the SM, without flavour violation, fail to simultaneously fit those observables and corroborate that they can modify $$ \textrm{BR}\left({B}^{+}\to {K}^{+}\nu \overline{\nu}\right) $$ BR B + → K + ν ν ¯ up to only a 10%. In view of this deficit, we propose a new way in which those models can accommodate the data at tree level by introducing lepton flavour violating couplings and non-diagonal elements of the charged lepton mixing matrix, with implications in future charged lepton flavour violation searches.

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Unified explanation of the anomalies in semileptonic B decays and the W mass

Cited by 21 publications

References 122 publications

Anomalies in Particle Physics

Anomalies in Particle Physics

Renormalization of a Standard Model extension with a Dark Abelian Sector and predictions for the W-boson mass

B meson anomalies and large $$ {B}^{+}\to {K}^{+}\nu \overline{\nu} $$ in non-universal U(1)′ models

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