Constraining lepton number violating interactions in rare kaon decays

Deppisch, Frank F.; Fridell, Kåre; Harz, Julia

doi:10.1007/jhep12(2020)186

Cited by 20 publications

(12 citation statements)

References 93 publications

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“…However, in order to confirm that the dominant contribution arises from a dim-9 contribution, additional information is needed. Different ideas for identifying the underlying mechanism exist such as comparison of results from different isotopes [76][77][78], observation of a discrepancy with the sum of neutrino masses determined by cosmology [79], a deviation in meson decays [15,16], or signals of LNV TeV-scale new physics from pp collider searches. Besides being able to possibly confirm the underlying new physics, the observation of an LNV signal at the Large Hadron Collider and/or a future 100 TeV pp collider would independently render standard thermal leptogenesis invalid.…”

Section: Discussionmentioning

confidence: 99%

“…In this work we explore these implications in detail using a concrete, simplified model for illustration. Our study builds on earlier analyses that addressed this question in an effective field theory (EFT) context [13][14][15][16]. For sufficiently heavy Λ, one may integrate the new degrees of freedom, yielding a set of non-renormalizable LNV interactions built from SM fields only.…”

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confidence: 97%

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TeV-scale Lepton Number Violation: Connecting Leptogenesis, Neutrinoless Double Beta Decay, and Colliders

Harz¹,

Ramsey-Musolf²,

Shen³

et al. 2021

Preprint

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In the context of TeV-scale lepton number violating (LNV) interactions, we illustrate the interplay between leptogenesis, neutrinoless double beta (0νββ) decay, and LNV searches at proton-proton colliders. Using a concrete model for illustration, we identify the parameter space where standard thermal leptogenesis is rendered unviable due to washout processes and show how 0νββ decay and pp collisions provide complementary probes. We find that the new particle spectrum can have a decisive impact on the relative sensitivity of these two probes.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 97%

TeV-scale Lepton Number Violation: Connecting Leptogenesis, Neutrinoless Double Beta Decay, and Colliders

Harz¹,

Ramsey-Musolf²,

Shen³

et al. 2021

Preprint

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“…Another interesting way to study NP effects is to examine q 2 -distributions for the K → πνν decays. The NP contributions to these decays have been computed for vector operators in [72] and scalar degrees of freedom in [73]. Such q 2 -distributions, although experimentally hard to access might be available in the coming decade.…”

Section: New Physicsmentioning

confidence: 99%

Kaon physics overview

Aebischer

2023

J. Phys.: Conf. Ser.

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The present status of Kaon physics is summarized from a theory point of view. Focus is laid on ΔS = 2, ΔS = 1 as well as on rare Kaon decays, where progress has been made for instance in the case of εK and KS → μ + μ − Furthermore, several New Physics scenarios are discussed in the context of rare Kaon decays and other Kaon observables.

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“…Following the prescription of [43,47,48] for the computation of thermal rate γ eq , the total washout effect from the operator O 1 can be expressed as…”

Section: Model-independent Implications Of N-n Oscillation On Baryogenesis Modelsmentioning

confidence: 99%

Probing baryogenesis with neutron-antineutron oscillations

Fridell

Harz

Hati

2021

J. High Energ. Phys.

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In the near future, the Deep Underground Neutrino Experiment and the European Spallation Source aim to reach unprecedented sensitivity in the search for neutron-antineutron (n-$$ \overline{n} $$ n ¯ ) oscillations, whose observation would directly imply |∆B| = 2 violation and hence might hint towards a close link to the mechanism behind the observed baryon asymmetry of the Universe. In this work, we explore the consequences of such a discovery for baryogenesis first within a model-independent effective field theory approach. We then refine our analysis by including a source of CP violation and different hierarchies between the scales of new physics using a simplified model. We analyse the implication for baryogenesis in different scenarios and confront our results with complementary experimental constraints from dinucleon decay, LHC, and meson oscillations. We find that for a small mass hierarchy between the new degrees of freedom, an observable rate for n-$$ \overline{n} $$ n ¯ oscillation would imply that the washout processes are too strong to generate any sizeable baryon asymmetry, even if the CP violation is maximal. On the other hand, for a large hierarchy between the new degrees of freedom, our analysis shows that successful baryogenesis can occur over a large part of the parameter space, opening the window to be probed by current and future colliders and upcoming n-$$ \overline{n} $$ n ¯ oscillation searches.

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Constraining lepton number violating interactions in rare kaon decays

Cited by 20 publications

References 93 publications

TeV-scale Lepton Number Violation: Connecting Leptogenesis, Neutrinoless Double Beta Decay, and Colliders

TeV-scale Lepton Number Violation: Connecting Leptogenesis, Neutrinoless Double Beta Decay, and Colliders

Kaon physics overview

Probing baryogenesis with neutron-antineutron oscillations

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