Neutral Current B-Decay Anomalies

Neshatpour, S.; Hurth, Tobias; Mahmoudi, F.; Santos, D. Martínez

doi:10.1007/978-3-031-30459-0_2

Cited by 4 publications

(1 citation statement)

References 43 publications

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“…Consequently, the uncertainties in the branching ratios of these channels, particularly in the low-𝑞 2 region, have been reduced from approximately 30% to about 10%, with no significant shifts in the central values. This improvement has resulted in tensions of about 4𝜎 in several 𝑞 2 bins [36]: In addition, the experimental combination for the branching ratio of the purely leptonic decay 𝐵 𝑠 → 𝜇 + 𝜇 − , which includes the latest CMS measurement [51], is as follows [52]:…”

Section: Pos(fpcp2023)010mentioning

confidence: 99%

Status of the global $b\to s\ell^+\ell^-$ fits

Capdevila

2023

Proceedings of 21st Conference on Flavor Physics and CP Violation — PoS(FPCP2023)

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The exploration of rare neutral current 𝑏 → 𝑠ℓ + ℓ − transitions is pivotal in testing the Standard Model (SM) and probing the presence of New Physics (NP) phenomena. This proceedings article offers an overview of recent developments in the examination of anomalies, deviations from SM predictions, in semi-leptonic 𝐵 meson decays. It encompasses both experimental and theoretical aspects within the domain of global analyses of 𝑏 → 𝑠ℓ + ℓ − observables. We start by reviewing the current status of the experimental measurements for the key observables that define the decay modes included in global analyses. Subsequently, we delve into the determination of non-perturbative contributions, crucial for the computation of the amplitudes of the various 𝑏 → 𝑠ℓ + ℓ − modes. Our focus extends to recent advancements in local and non-local form factor calculations and their implications for SM predictions. This sets the stage for a detailed exploration of the outcomes from recent global analyses in the context of one-dimensional (1D) and two-dimensional (2D) fits. We underscore the importance of lepton flavour universality (LFU) throughout this discussion. Furthermore, we explore the interconnections between the tensions in 𝑏 → 𝑠ℓ + ℓ − data and the anomalies in charged current 𝑏 → 𝑐ℓ𝜈 transitions, most notably in the 𝑅(𝐷) and 𝑅(𝐷 * ) ratios. Lastly, we comment on the enhancement of 𝑏 → 𝑠𝜏 + 𝜏 − processes that follows from general NP explanations of the 𝑅(𝐷) and 𝑅(𝐷 * ) anomalies within the Standard Model Effective Theory (SMEFT), under current constraints.

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Section: Pos(fpcp2023)010mentioning

confidence: 99%

Status of the global $b\to s\ell^+\ell^-$ fits

Capdevila

2023

Proceedings of 21st Conference on Flavor Physics and CP Violation — PoS(FPCP2023)

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SU(2)L deconstruction and flavour (non)-universality

Capdevila,

Crivellin,

Lizana

et al. 2024

J. High Energ. Phys.

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We study two-site deconstructions of the SU(2)L gauge group factor of the SM. Models based on this approach can explain the hierarchies of the quark masses and CKM mixing between third and light families if these fields are localised on different sites by the presence of hierarchical new physics scales. The model leads to an accidental global U(2)q × U(3)u × U(3)d flavour symmetry which prevents dangerously large effects in flavour observables, making a TeV extension of the SM possible. Given the structure of the PMNS matrix in the neutrino sector, we explore different possibilities for the arrangement of the leptons on the two sites, and consider different models with U(2)ℓ or U(3)ℓ flavour symmetries. The phenomenology of the models is mostly governed by a massive vector triplet of SU(2)L. We study the interesting interplay between LHC searches and precision observables. In particular, one of the models can give a sizeable lepton flavour universal effect in the Wilson coefficient C9 while naturally suppressing contributions to C10, as suggested by current b → sℓ+ℓ− data, predicting simultaneously a mild positive shift in the W boson mass.

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Global fit to the 2HDM with generic sources of flavour violation using GAMBIT

Athron,

Crivellin,

Gonzalo

et al. 2024

J. High Energ. Phys.

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We perform a global statistical analysis of the two-Higgs-doublet model with generic sources of flavour violation using GAMBIT. This is particularly interesting in light of deviations from the Standard Model predictions observed in $$ b\to c\tau \overline{\nu} $$ b → cτ ν ¯ and b → sℓ+ℓ− transitions as well as the indications for a charged Higgs with a mass of 130 GeV in top quark decays. Including all relevant constraints from precision, flavour and collider observables, we find that it is possible to simultaneously explain both the charged and neutral current B anomalies. We study the impact of using different values for the W mass and the Standard Model prediction for the anomalous magnetic moment of the muon and provide predictions for observables that can probe our model in the future such as lepton flavour violation searches at Belle II and Higgs coupling strength measurements at the high-luminosity LHC.

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Neutral Current B-Decay Anomalies

Cited by 4 publications

References 43 publications

Status of the global $b\to s\ell^+\ell^-$ fits

Status of the global $b\to s\ell^+\ell^-$ fits

SU(2)L deconstruction and flavour (non)-universality

Global fit to the 2HDM with generic sources of flavour violation using GAMBIT

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