Leptoquarks in Flavour Physics

Müller, D.

doi:10.1051/epjconf/201817901015

Cited by 11 publications

(5 citation statements)

References 71 publications

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“…In Table 2, leptoquark states which can explain either R D( * ) or R K( * ) or both anomalies are listed. In the case of (g − 2) µ , only R 2 and S 1 might explain the observed deviations due to the m t /m µ enhancement at the one-loop level [49].…”

Section: Leptoquarks Explaining B Anomaliesmentioning

confidence: 94%

Theory Status - Puzzles in B Meson Decays and LFU?

Fajfer

2019

SciPost Phys. Proc.

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Currently B meson puzzles motivate many studies of New Physics due to the observed deviations from the Standard Model predictions. There are two B meson puzzles, R_{D^{(*)}}RD(*) and R_{K^{(*)}}RK(*). The first one denotes the deviations in the decays driven by the charged current in the ratio of the decay widths for B \to D^{(*)} \tau \nuB→D(*)τν and B \to D^{(*)} \mu \nuB→D(*)μν, while the second one is related to the ratio of the decay widths for B \to K^{(*)} \mu^+ \mu^-B→K(*)μ+μ− and B \to K^{(*)} e^+ e^-B→K(*)e+e− transition. Also, the measured muon anomalous magnetic moment differs from the SM predictions. Usually, the effective Lagrangian approach containing New Physics effects is used to analyse R_{D^{(*)}}RD(*) and R_{K^{(*)}}RK(*). Among many models of New Physics, various leptoquark models are suggested to resolve both B meson anomalies. If New Physics is confirmed in B decays a number of processes at low and high energies should confirm its presence.

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Section: Leptoquarks Explaining B Anomaliesmentioning

confidence: 94%

Theory Status - Puzzles in B Meson Decays and LFU?

Fajfer

2019

SciPost Phys. Proc.

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“…In the case of (g − 2) µ only R 2 and S 1 might explain the observed deviations. These two leptoquarks lead to the m t /m µ enhanced contribution to the muon anomalous magnetic moment at one loop level [49].…”

Section: Leptoquarks Resolving B Anomaliesmentioning

confidence: 99%

Flavor theory & outlook

Fajfer¹

2019

Proceedings of the 39th International Conference on High Energy Physics — PoS(ICHEP2018)

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Disagreements between experimental results and Standard Model theoretical predictions found in B meson decays, initiated many theoretical studies in flavour physics. The anomalous behaviour observed in B meson decays are known as R D ( * ) and R K ( * ) puzzles. The first one refers to the deviations in the decays in the ratio of the decay widths for B → D ( * ) τν and B → D ( * ) µν, while the second one is related to the ratio of the decay widths for B → K ( * ) µ + µ − and B → K ( * ) e + e − transition. In addition, the measured muon anomalous magnetic moment differs from the SM predictions. I briefly review main results coming from the SM studies and the effective Lagrangian approach containing New Physics for R D ( * ) and R K ( * ) . Then I discuss basic features of leptoquark models which can resolve both B meson anomalies. If New Physics is confirmed in B decays a number of processes at low and high energies should confirm its presence.

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“…Considerable amount of work regarding LQs have been done both from the point of view of their diverse phenomenological aspects [23][24][25], and specific properties . Furthermore, several articles [49,[57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74] that explain the different flavour anomalies with different versions of LQ models exist in the literature.…”

Section: Introductionmentioning

confidence: 99%

Collider signature of V_2 Leptoquark with b → s flavour observables

Biswas

Shaw

Swain³

2019

LHEP

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The Leptoquark model has been instrumental in explaining the observed lepton flavour universality violating charged (b → c) and neutral (b → s) current anomalies that have been the cause for substantial excitement in particle physics recently. In this article we have studied the role of one (designated as V 4 3 2 ) of the components of V 2 Vector Leptoquark doublet with electromagnetic charge 4 3 in explaining the neutral current (b → s) anomalies R K ( * ) and B s → µ + µ − . Moreover, we have performed a thorough collider search for this V 4 3 2 Leptoquark using bb + − ( ≡ e, µ) final state at the Large Hadron Collider. From our collider analysis we maximally exclude the mass of the V 4 32 Leptoquark up to 2340 GeV at 95% confidence level for the 13 TeV Large Hadron Collider for an integrated luminosity of 3000 fb −1 . Furthermore, a significant portion of the allowed parameter space that is consistent with the neutral current (b → s) observables is excluded by collider analysis.

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Leptoquarks in Flavour Physics

Cited by 11 publications

References 71 publications

Theory Status - Puzzles in B Meson Decays and LFU?

Theory Status - Puzzles in B Meson Decays and LFU?

Flavor theory & outlook

Collider signature of V_2 Leptoquark with b → s flavour observables

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