Probing lepton number violation: a comprehensive survey of dimension-7 SMEFT

Fridell, Kåre; Gráf, Lukáš; Harz, Julia; Hati, Chandan

doi:10.1007/jhep05(2024)154

Cited by 6 publications

References 154 publications

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Probing heavy neutrino magnetic moments at the LHC using long-lived particle searches

Beltrán,

Bolton,

Deppisch

et al. 2024

J. High Energ. Phys.

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We explore long-lived particle (LLP) searches using non-pointing photons at the LHC as a probe for sterile-to-sterile and active-to-sterile transition magnetic dipole moments of sterile neutrinos. We consider heavy sterile neutrinos with masses ranging from a few GeV to several hundreds of GeV. We discuss transition magnetic dipole moments using the Standard Model effective field theory and low-energy effective field theory extended by sterile neutrinos (NRSMEFT and NRLEFT) and also provide a simplified UV-complete model example. LLP searches at the LHC using non-pointing photons will probe sterile-to-sterile dipole moments two orders of magnitude below the current best constraints from LEP, while an unprecedented sensitivity to sterile neutrino mass of about 700 GeV is expected for active-to-sterile dipole moments. For the UV model example with one-loop transition magnetic moments, the searches for charged lepton flavour violating processes in synergy with LLP searches at the LHC can probe new physics at several TeV mass scales and provide valuable insights into the lepton flavour structure of new physics couplings.

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Probing heavy neutrino magnetic moments at the LHC using long-lived particle searches

Beltrán,

Bolton,

Deppisch

et al. 2024

J. High Energ. Phys.

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Disentangling new physics in $$ K\to \pi \nu \overline{\nu} $$ and $$ B\to K\left({K}^{\ast}\right)\nu \overline{\nu} $$ observables

Buras,

Harz,

Mojahed

2024

J. High Energ. Phys.

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We investigate the possibility of disentangling different new physics contributions to the rare meson decays "Image missing" and "Image missing" through kinematic distributions in the missing energy "Image missing". We employ dimension-6 operators within the Low-Energy Effective Field Theory (LEFT), identifying the invisible part of the final state as either active or sterile neutrinos. Special emphasis is given to lepton-number violating (LNV) operators with scalar and tensor currents. We show analytically that contributions from vector, scalar, and tensor quark currents can be uniquely determined from experimental data of kinematic distributions. In addition, we present new correlations of branching ratios for K and B-decays involving scalar and tensor currents. As there could a priori also be new invisible particles in the final states, we include dark-sector operators giving rise to two dark scalars, fermions, or vectors in the final state. In this context, we present new calculations of the inclusive decay rate "Image missing" for dark operators. We show that careful measurements of kinematic distributions make it theoretically possible to disentangle the contribution from LEFT operators from most of the dark-sector operators, even when multiple operators are contributing. We revisit sum rules for vector currents in LEFT and show that the latter are also satisfied in some new dark-physics scenarios that could mimic LEFT. Finally, we point out that an excess in rare meson decays consistent with a LNV hypothesis would point towards highly flavor non-democratic physics in the UV, and could put high-scale leptogenesis under tension.

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Probing lepton number violation at energies low and high

Gráf

2024

AIP Conference Proceedings

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Probing lepton number violation: a comprehensive survey of dimension-7 SMEFT

Cited by 6 publications

References 154 publications

Probing heavy neutrino magnetic moments at the LHC using long-lived particle searches

Probing heavy neutrino magnetic moments at the LHC using long-lived particle searches

Disentangling new physics in $$ K\to \pi \nu \overline{\nu} $$ and $$ B\to K\left({K}^{\ast}\right)\nu \overline{\nu} $$ observables

Probing lepton number violation at energies low and high

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