LFU and CP violation in $b \to s \mu \mu$

Smolkovič, Aleks

doi:10.22323/1.414.0715

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…The previous measurements indicating R K < 1 inspired a plethora of NP explanations with LFU-violating couplings to electrons and muons [41][42][43][44][45][46][47]. In the following, we consider the recent measurement of R K in (2) and explore what room remains for LFU-violating couplings.…”

Section: Testing Electron-muon Universalitymentioning

confidence: 98%

New Perspectives for Testing Electron-Muon Universality

Fleischer¹,

Malami²,

Rehult³

et al. 2023

Preprint

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Intriguing results for tests of the universality of electrons and muons through measurements of rates of B → K + − and similar decays have been in the spotlight for years. The LHCb collaboration has recently reported new results which are in agreement with Lepton Flavour Universality, while the individual decay rates are found below their Standard Model predictions. In view of this new situation, we explore how much space is left for a violation of electron-muon universality. Considering new sources of CP violation and taking the new LHCb measurements into account, we show that significant differences between the short-distance coefficients for electronic and muonic final states are actually allowed by the current data. These patterns can be revealed through CP asymmetries in neutral and charged B → K + − decays. We obtain correlations between these observables and map them to the short-distance coefficients. This results in regions in New Physics parameter space with large differences between CP asymmetries of the decays with final-state electrons and muons, thereby leaving a lot of room for possible surprises in the future high-precision era.

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Section: Testing Electron-muon Universalitymentioning

confidence: 98%

New Perspectives for Testing Electron-Muon Universality

Fleischer¹,

Malami²,

Rehult³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

Fingerprinting CP-violating New Physics with B → Kμ+μ−

Fleischer

Malami

Rehult

et al. 2023

J. High Energ. Phys.

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The B → Kℓ+ℓ− system is particularly interesting to explore physics beyond the Standard Model. Such effects could provide new sources of CP violation, thereby giving rise to Wilson coefficients which could not only be real, as assumed in most analyses, but also be complex. We propose a new strategy to extract the complex C9μ, C10μ from the data, utilising the complementarity of direct CP violation in B+ → K+μ+μ− and mixing-induced CP violation arising — in addition to direct CP violation — in $$ {B}_d^0\to {K}_S{\mu}^{+}{\mu}^{-} $$ B d 0 → K S μ + μ − , as well as the differential rate in appropriate q2 bins. The long-distance effects, which play a key role to generate the direct CP asymmetries, cannot be reliably calculated due to their non-perturbative nature. In order to describe them, we apply a model by the LHCb Collaboration employing experimental data. Assuming specific scenarios, we demonstrate the fingerprinting of CP-violating New Physics and the distinction between ambiguities in the model of the long-distance contributions. Finally, New Physics could couple differently to muons and electrons, as probed through the lepton flavour universality ratio RK. We discuss these effects in the presence of CP violation and present a new way to measure the direct CP asymmetries of the B → Ke+e− channels.

show abstract

New perspectives for testing electron-muon universality

Fleischer

Malami

Rehult

et al. 2023

J. High Energ. Phys.

View full text Add to dashboard Cite

Intriguing results for tests of the universality of electrons and muons through measurements of rates of B → Kℓ+ℓ− and similar decays have been in the spotlight for years. The LHCb collaboration has recently reported new results which are in agreement with Lepton Flavour Universality, while the individual decay rates are found below their Standard Model predictions. In view of this new situation, we explore how much space is left for a violation of electron-muon universality. Considering new sources of CP violation and taking the new LHCb measurements into account, we show that significant differences between the short-distance coefficients for electronic and muonic final states are actually allowed by the current data. These patterns can be revealed through CP asymmetries in neutral and charged B → Kℓ+ℓ− decays. We obtain correlations between these observables and map them to the short-distance coefficients. This results in regions in New Physics parameter space with large differences between CP asymmetries of the decays with final-state electrons and muons, thereby leaving a lot of room for possible surprises in the future high-precision era.

show abstract

LFU and CP violation in $b \to s \mu \mu$

Cited by 3 publications

References 17 publications

New Perspectives for Testing Electron-Muon Universality

New Perspectives for Testing Electron-Muon Universality

Fingerprinting CP-violating New Physics with B → Kμ+μ−

New perspectives for testing electron-muon universality

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