Abstract
The inclusion of heavy neutral leptons to the Standard Model particle content could provide solutions to many open questions in particle physics and cosmology. The modification of the charged and neutral currents from active-sterile mixing of neutral leptons can provide novel signatures in Standard Model processes. We revisit the displaced vertex signature that could occur in collisions at the LHC via the decay of heavy neutral leptons with masses of a few GeV emphasizing the implications of flavor, kinematics, inclusive production and number of these extra neutral fermions. We study in particular the implication on the parameter space sensitivity when all mixings to active flavors are taken into account. We also discuss alternative cases where the new particles are produced in a boosted regime.
Highlights
An exciting possibility occurs in a region of parameter space for which the heavy neutral leptons (HNL) are long-lived particles that can decay with a sizable displacement in the LHC detectors, and such displaced vertices (DV) would be a distinctive signature of their existence [28]
We revisit the displaced vertex signature that could occur in collisions at the LHC via the decay of heavy neutral leptons with masses of a few GeV emphasizing the implications of flavor, kinematics, inclusive production and number of these extra neutral fermions
An exciting possibility occurs in a region of parameter space for which the HNL are long-lived particles that can decay with a sizable displacement in the LHC detectors, and such displaced vertices (DV) would be a distinctive signature of their existence [28]
Summary
A similar behavior is featured in the pp → X μ±e∓ν channel (central panel), the flavor dependence is milder In this case there are more events due to the larger branching ratios to this channel, and the experimental signature is more interesting because of the different flavor of the final charged leptons. One would like to explore all the possible final states, as they provide complementary information about the flavor structure of the HNL
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