Rare b decays meet high-mass Drell-Yan

Greljo, Admir; Šalko, Jakub; Smolkovič, Aleks; Stangl, Peter

doi:10.1007/jhep05(2023)087

Cited by 59 publications

(18 citation statements)

References 117 publications

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“…Indeed, remembering the constraints on 𝐶 10 coming from current data on 𝐵 𝑠 → 𝜇𝜇 mentioned in Sec. 3, the presence of LFU NP effects in 𝐶 9 is still not excluded, albeit with different significance according to the treatment of non-local hadronic uncertainties [34][35][36].…”

Section: Marco Fedelementioning

confidence: 99%

B rare decays: theory overview

Fedele

2024

Proceedings of Workshop Italiano Sulla Fisica ad Alta Intensità — PoS(WIFAI2023)

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In this proceeding we will review the current theoretical status of rare 𝐵 decays. These decays are indeed excellent indirect probes for New Physics searches, and in the current situation where no new states have been directly observed at collider, they provide a fundamental and alternative approach in the quest for Physics beyond the Standard Model. We will focus on the following classes of decays: 𝐵 𝑞 → 𝜏𝜈, 𝐵 𝑞 → 𝜇𝜇, 𝐵 → 𝐾 ( * ) 𝜈 ν, 𝐵 → 𝐾 ( * ) ℓℓ, 𝐵 𝑠 → 𝜙ℓℓ and 𝑏 → 𝑠𝛾. The most updated Standard Model predictions will be provided, highlighting which are the main sources of uncertainty, and what is the possibility for New Physics effects when confronting the theory numbers to current experimental results.

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Section: Marco Fedelementioning

confidence: 99%

B rare decays: theory overview

Fedele

2024

Proceedings of Workshop Italiano Sulla Fisica ad Alta Intensità — PoS(WIFAI2023)

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“…Notably, imposing constraints like minimal flavor violation (MFV) would preclude significant effects in b → uℓν decays. For MFV correlations in b → qℓ + ℓ − decays see [35].…”

Section: Jhep11(2023)023mentioning

confidence: 99%

“…As for the numerical analysis, both in this and in the following section, we use the same setup as already described in section 2. Most of the complementary constraints discussed in the following are already a part of the public smelli [72,73] likelihood, except for high-mass Drell-Yan tails, which we add based on their implementation in flavio [35]. As mentioned in section 2, we consider the dependence of the theoretical uncertainties on the NP parameters [35,74].…”

Section: Jhep11(2023)023mentioning

confidence: 99%

“…Most of the complementary constraints discussed in the following are already a part of the public smelli [72,73] likelihood, except for high-mass Drell-Yan tails, which we add based on their implementation in flavio [35]. As mentioned in section 2, we consider the dependence of the theoretical uncertainties on the NP parameters [35,74]. We choose the initial scale at which the SMEFT operators are defined to be Λ = 1 TeV, and rely on wilson [78] for the running and matching 7 of the WCs, both above and below the EW scale and on the Wilson coefficient exchange format (WCxf) [79] to represent the Wilson coefficients and to fix the EFT bases.…”

Section: Jhep11(2023)023mentioning

confidence: 99%

“…See refs. [35,88] for dedicated studies of this sector in the WET. The related FCNC process b → dνν is sensitive to the operators Q…”

Section: Jhep11(2023)023mentioning

confidence: 99%

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SMEFT restrictions on exclusive b → uℓν decays

Greljo,

Salko,

Smolkovič

et al. 2023

J. High Energ. Phys.

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Exclusive semileptonic b hadron decays (b → uℓν) serve as a sandbox for probing strong and electroweak interactions and for extracting the CKM element Vub. Instead, this work investigates their underexplored potential to reveal new short-distance physics. Utilizing SMEFT as a conduit to chart territory beyond the SM, we demonstrate that substantive new physics contributions in b → uℓν are necessarily linked to correlated effects in rare neutral-current b decays, neutral B meson mixing or high-mass Drell-Yan tails. We find that measurements of the latter processes strongly restrict the allowed deviations in the former. A complete set of tree-level mediators, originating from a perturbative ultraviolet model and matching at dimension 6, is thoroughly explored to support this assertion. As a showcase application, we examine the feasibility of a new physics interpretation of the recent tension in exclusive |Vub| extraction from B → Vℓν where V = (ρ, ω).

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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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Rare b decays meet high-mass Drell-Yan

Cited by 59 publications

References 117 publications

B rare decays: theory overview

B rare decays: theory overview

SMEFT restrictions on exclusive b → uℓν decays

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

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