Flavor and CP violation from a QCD-like hidden sector

Bensalem, Wafia; Stolarski, Daniel

doi:10.1007/jhep02(2022)011

“…Due to the connection to the SM flavor structure such models also contribute to flavor processes such as neutral meson mixing and flavor violating Kaon B and D decays. The impact on flavor physics for dark sectors coupled to the down-type quarks has been studied in [80,82,83], and for couplings to up-type quarks in [81,82], as well as models with CP violation [89], and for a simplified model in [86]. In both cases the parameter space is largely unconstrained for dark pion masses above a few GeV.…”

Section: T-channelmentioning

confidence: 99%

Theory, phenomenology, and experimental avenues for dark showers: a Snowmass 2021 report

Albouy

¹

,

Barron

²

,

Beauchesne

³

et al. 2022

Self Cite

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In this work, we consider the case of a strongly coupled dark/hidden sector, which extends the Standard Model (SM) by adding an additional non-Abelian gauge group. These extensions generally contain matter fields, much like the SM quarks, and gauge fields similar to the SM gluons. We focus on the exploration of such sectors where the dark particles are produced at the LHC through a portal and undergo rapid hadronization within the dark sector before decaying back, at least in part and potentially with sizeable lifetimes, to SM particles, giving a range of possibly spectacular signatures such as emerging or semi-visible jets. Other, non-QCD-like scenarios leading to soft unclustered energy patterns or glueballs are also discussed. After a review of the theory, existing benchmarks and constraints, this work addresses how to build consistent benchmarks from the underlying physical parameters and present new developments for the pythia Hidden Valley module, along with jet substructure studies. Finally, a series of improved search strategies is presented in order to pave the way for a better exploration of the dark showers at the LHC.

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“…Due to the connection to the SM flavour structure such models also contribute to flavour processes such as neutral meson mixing and flavour violating Kaon B and D decays. The impact on flavour physics for dark sectors coupled to the down-type quarks has been studied in [78,75,77], and for couplings to up-type quarks in [77,76], as well as models with CP violation [84], and for a simplified model in [81]. In both cases the parameter space is largely unconstrained for dark pion masses above a few GeV.…”

Section: T-channelmentioning

confidence: 99%

Theory, phenomenology, and experimental avenues for dark showers: a Snowmass 2021 report

Albouy,

Barron,

Beauchesne

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

In this work, we consider the case of a strongly coupled dark/hidden sector, which extends the Standard Model (SM) by adding an additional non-Abelian gauge group. These extensions generally contain matter fields, much like the SM quarks, and gauge fields similar to the SM gluons. We focus on the exploration of such sectors where the dark particles are produced at the LHC through a portal and undergo rapid hadronization within the dark sector before decaying back, at least in part and potentially with sizeable lifetimes, to SM particles, giving a range of possibly spectacular signatures such as emerging or semi-visible jets. Other, non-QCD-like scenarios leading to soft unclustered energy patterns or glueballs are also discussed. After a review of the theory, existing benchmarks and constraints, this work addresses how to build consistent benchmarks from the underlying physical parameters and present new developments for the pythia Hidden Valley module, along with jet substructure studies. Finally, a series of improved search strategies is presented in order to pave the way for a better exploration of the dark showers at the LHC.6 Summary and Perspectives 90 7 Acknowledgements 92 * The spin-0 states also include the flavor-singlet η v , which, as discussed in Eq. 15, can be relatively heavy. However there is no way to take this into account for separateFlav=off.† Although the spin-1 states include the flavor-singlet ωv, analogous to the spin-0 η v , it is expected to be close in mass to the other spin-1 states, as noted in sec. 4.1.1.

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Baryogenesis and leptogenesis from supercooled confinement

Dichtl,

Nava,

Pascoli

et al. 2024

J. High Energ. Phys.

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We propose a framework of baryogenesis and leptogenesis that relies on a supercooled confining phase transition (PT) in the early universe. The baryon or lepton asymmetry is sourced by decays of hadrons of the strong dynamics after the PT, and it is enhanced compared to the non-confining case, which was the only one explored so far. This widens the energy range of the PT, where the observed baryon asymmetry can be reproduced, down to the electroweak scale. The framework then becomes testable with gravity waves (GW) at LISA and the Einstein Telescope. We then study two explicit realisations: one of leptogenesis from composite sterile neutrinos that realises inverse see-saw; one of baryogenesis from composite scalars that is partly testable by existing colliders and flavour factories.

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Flavor and CP violation from a QCD-like hidden sector

Cited by 5 publications

References 109 publications

Theory, phenomenology, and experimental avenues for dark showers: a Snowmass 2021 report

Theory, phenomenology, and experimental avenues for dark showers: a Snowmass 2021 report

Theory, phenomenology, and experimental avenues for dark showers: a Snowmass 2021 report

Baryogenesis and leptogenesis from supercooled confinement

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