The time-dependent angular analysis of Bd → KSℓℓ, a new benchmark for new physics

Descotes-Genon, S.; Novoa-Brunet, Martín; Vos, Kimberley

doi:10.1007/jhep02(2021)129

Cited by 18 publications

(20 citation statements)

References 56 publications

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“…Further progress may also be achieved through a better understanding of the theoretical uncertainties involved [49,50,73],more data on other modes and with other experimental setups (in particular Belle II [74]), but also the determination of additional observables [75][76][77]. This supplementary information should help us to corner the actual NP pattern hinted at by the b → s anomalies currently observed and confirmed as an evidence in R K by the LHCb collaboration.…”

Section: (A) (B)mentioning

confidence: 82%

$$b\rightarrow s\ell ^+\ell ^-$$ global fits after $$R_{K_S}$$ and $$R_{K^{*+}}$$

et al. 2022

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We present an up-to-date complete model-independent global fit to $$b\rightarrow s\ell \ell $$ b → s ℓ ℓ observables that confirms patterns of New Physics able to explain the data. We include the recent LHCb measurements of $$R_K$$ R K , $$R_{K_S}$$ R K S , $$R_{K^{*+}}$$ R K ∗ + , $$B_s \rightarrow \phi \mu ^+\mu ^-$$ B s → ϕ μ + μ - and $$B_s\rightarrow \mu ^+\mu ^-$$ B s → μ + μ - in our analysis, which now includes 254 observables. This updates our previous analyses and strengthens their two main outcomes. First, the presence of right-handed couplings encoded in the Wilson coefficients $${{\mathcal {C}}}_{9'\mu }$$ C 9 ′ μ and $${{\mathcal {C}}}_{10'\mu }$$ C 10 ′ μ remains a viable possibility. Second, a lepton flavour universality violating (LFUV) left-handed lepton coupling ($${{\mathcal {C}}}_{9\mu }^{\mathrm{V}}=-{{\mathcal {C}}}_{10\mu }^{\mathrm{V}}$$ C 9 μ V = - C 10 μ V ), often preferred from the model building point of view, accommodates the data better if lepton-flavour universal New Physics is allowed, in particular in $${{\mathcal {C}}}_{9}^{\mathrm{U}}$$ C 9 U . We observe that the LFUV observable $$Q_5$$ Q 5 offers a very interesting possibility to separate both types of scenarios.

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Section: (A) (B)mentioning

confidence: 82%

$$b\rightarrow s\ell ^+\ell ^-$$ global fits after $$R_{K_S}$$ and $$R_{K^{*+}}$$

et al. 2022

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“…This talk is based on Refs. [1,2]. Recently, several deviations from SM predictions, hinting towards Lepton Flavour Universality Violating (LFUV) New Physics (NP), have been observed in semi-leptonic 𝑏 decays [3].…”

Section: Introductionmentioning

confidence: 99%

“…In Ref. [1] we discuss that these phases can be probed cleanly through the interference of mixing and decay for 𝐵 → 𝑃(𝑆)ℓℓ decays, and a similar analysis can be made for 𝐵 → 𝑉ℓℓ decays based on the expressions in [5].…”

Section: Introductionmentioning

confidence: 99%

“…In the following sections, we briefly describe the observables and the framework introduced in Refs. [1,2] and we discuss the importance of the time-dependent observables in both kinds of decays as they are fundamental to constrain NP phases. For simplicity, we will focus on the 𝐵 𝑑 → 𝐾 𝑆 ℓℓ decay with ℓℓ = ℓ + ℓ − , 𝜈 ν, however, with few changes discussed in Refs.…”

Section: Introductionmentioning

confidence: 99%

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Probing CP violation in semi-leptonic decays through time-evolution

Brunet¹

2023

Proceedings of 41st International Conference on High Energy Physics — PoS(ICHEP2022)

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We discuss the role of time-dependent observables in probing CP-violation in 𝑏 → 𝑠ℓ + ℓ − and 𝑏 → 𝑠𝜈 ν decays. We identify a set of new observables by looking at the time evolution of the differential decay rate of 𝐵 𝑑 → 𝐾 𝑆 ℓ + ℓ − and 𝐵 𝑑 → 𝐾 𝑆 𝜈 ν where the interference of 𝐵 𝑑 − B𝑑 meson mixing and decay is probed. We show that these observables do not require a timedependent analysis but could be obtained by time-integrated or time-asymmetries if flavour tagging is available. These observables are precisely predicted in the SM, are unaffected by NP in models with real contributions to SM and chirally flipped operators, are independent of form factors, and are unaffected by hadronic uncertainties. They are however sensitive probes of NP scenarios involving new CP-odd phases.

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“…700,701] and B 0 s → φµ + µ − [669] decays, and lepton universality ratios and angular observables in heavily suppressed b → d + − transitions[702][703][704][705].…”

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confidence: 99%

Heavy Flavour Physics and CP Violation at LHCb: a Ten-Year Review

Chen¹,

Li²,

Qian³

et al. 2021

Preprint

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Heavy flavour physics provides excellent opportunities to indirectly search for new physics at very high energy scales and to study hadron properties for deep understanding of the strong interaction. The LHCb experiment has been playing a leading role in the study of heavy flavour physics since the start of the LHC operations about ten years ago, and made a range of high-precision measurements and unexpected discoveries, which may have far-reaching implications on the field of particle physics. This review highlights a selection of the most influential physics results on CP violation, rare decays, and heavy flavour production and spectroscopy obtained by LHCb using the data collected during the first two operation periods of the LHC. The upgrade plan of LHCb and the physics prospects are also briefly discussed.

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The time-dependent angular analysis of Bd → KSℓℓ, a new benchmark for new physics

Cited by 18 publications

References 56 publications

$$b\rightarrow s\ell ^+\ell ^-$$ global fits after $$R_{K_S}$$ and $$R_{K^{*+}}$$

$$b\rightarrow s\ell ^+\ell ^-$$ global fits after $$R_{K_S}$$ and $$R_{K^{*+}}$$

Probing CP violation in semi-leptonic decays through time-evolution

Heavy Flavour Physics and CP Violation at LHCb: a Ten-Year Review

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