Constraints on New Physics from B Mesons

Blanke, Monika

doi:10.22323/1.367.0015

Cited by 3 publications

(3 citation statements)

References 84 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have used the CheckMATE 2 tool to implement and the validation was done for the stau simplified model in the low mass and high mass signal regions. 9 The ATLAS collaboration has provided separate exclusion curves for each signal region and these are compared to the ones obtained through recasting, as shown in figure 22. As shown, the recasting results agree well with the exclusion curves, given the expected recasting uncertainties.…”

Section: C6 Atlas τ τ +Metmentioning

confidence: 99%

“…Two classes of new physics models can accommodate these results: scenarios featuring either leptoquarks or an extra Z boson (see e.g. [9] and references therein). None of these particles, however, address on their own some additional shortcomings of the Standard Model of particle physics such as electroweak naturalness, neutrino masses and the dark matter (DM) puzzle, just to mention a few.…”

Section: Jhep02(2022)042 1 Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Leptoquark manoeuvres in the dark: a simultaneous solution of the dark matter problem and the $$ {R}_{D^{\left(\ast \right)}} $$ anomalies

Bélanger

Bharucha

Fuks

et al. 2022

J. High Energ. Phys.

View full text Add to dashboard Cite

The measured branching fractions of B-mesons into leptonic final states derived by the LHCb, Belle and BaBar collaborations hint towards the breakdown of lepton flavour universality. In this work we take at face value the so-called $$ {R}_{D^{\left(\ast \right)}} $$ R D ∗ observables that are defined as the ratios of neutral B-meson charged-current decays into a D(*)-meson, a charged lepton and a neutrino final state in the tau and light lepton channels. A well-studied and simple solution to this charged current anomaly is to introduce a scalar leptoquark S1 that couples to the second and third generation of fermions. We investigate how S1 can also serve as a mediator between the Standard Model and a dark sector. We study this scenario in detail and estimate the constraints arising from collider searches for leptoquarks, collider searches for missing energy signals, direct detection experiments and the dark matter relic abundance. We stress that the production of a pair of leptoquarks that decays into different final states (i.e. the commonly called “mixed” channels) provides critical information for identifying the underlying dynamics, and we exemplify this by studying the tτbν and the resonant S1 plus missing energy channels. We find that direct detection data provides non-negligible constraints on the leptoquark coupling to the dark sector, which in turn affects the relic abundance. We also show that the correct relic abundance can not only arise via standard freeze-out, but also through conversion-driven freeze-out. We illustrate the rich phenomenology of the model with a few selected benchmark points, providing a broad stroke of the interesting connection between lepton flavour universality violation and dark matter.

show abstract

Section: C6 Atlas τ τ +Metmentioning

confidence: 99%

Section: Jhep02(2022)042 1 Introductionmentioning

confidence: 99%

Leptoquark manoeuvres in the dark: a simultaneous solution of the dark matter problem and the $$ {R}_{D^{\left(\ast \right)}} $$ anomalies

Bélanger

Bharucha

Fuks

et al. 2022

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…Specific examples can be found in Ref. [28]. Generally, models predicting lepton non-universality also imply lepton flavour violation, making the latter a sensitive probe to these NP scenarios.…”

Section: Lepton Flavour Violation Searchesmentioning

confidence: 99%

Rare decays of B-hadrons

Benito

2019

Preprint

View full text Add to dashboard Cite

Rare decays of b-hadrons provide high sensitivity to New Physics effects. Several deviations with respect to the Standard Model predictions have been observed in recent years, leading to significant tensions in global fit analyses. It is thus crucial to update the existing measurements and study new decay modes to confirm the pattern. The latest results from LHCb and Belle on radiative, semileptonic penguin, lepton universality and lepton flavour violation decays are presented.

show abstract