Classification of dark pion multiplets as dark matter candidates and collider phenomenology

We discuss a minimal realization of the strongly interacting massive particle (SIMP) framework. The model includes a dark copy of QCD with three colors and three light flavors. A massive dark photon, kinetically mixed with the Standard Model hypercharge, maintains kinetic equilibrium between the dark and visible sectors. One of the dark mesons is necessarily unstable but long-lived, with potential impact on CMB observables. We show that an approximate “isospin” symmetry acting on the down-type quarks is an essential ingredient of the model. This symmetry stabilizes the dark matter and allows to split sufficiently the masses of the other states to suppress strongly their relic abundances. We discuss for the first time the SIMP cosmology with sizable mass splittings between all meson multiplets. We demonstrate that the SIMP mechanism remains efficient in setting the dark matter relic density, while CMB constraints on unstable relics can be robustly avoided. We also consider the phenomenological consequences of isospin breaking, including dark matter decay. Cosmological, astrophysical, and terrestrial probes are combined into a global picture of the parameter space. In addition, we outline an ultraviolet completion in the context of neutral naturalness, where confinement at the GeV scale is generic. We emphasize the general applicability of several novel features of the SIMP mechanism that we discuss here.

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“…This spectrum was previously considered in a very different regime, with O(100) GeV dark meson masses[27].…”

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confidence: 99%

Split SIMPs with decays

Katz

Salvioni

Shakya

2020

J. High Energ. Phys.

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“…In the parameter region of interest, the ρ 0 d meson is predicted to decay promptly. 10 The most interesting constraints in the present context are therefore the ones searching for a narrow resonance in the e + e − , µ + µ − or π + π − final state. Specifically, we consider bounds from KLOE [39,40] and BaBar [37], which we obtain using Darkcast [63].…”

Section: Resonance Searchesmentioning

confidence: 98%

“…A promising strategy to explore this scenario is to try and produce dark sector states with sufficiently high energy that the fundamental constituents (i.e. dark quarks and gluons) are revealed and the details of hadronisation can be studied [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Forecasting dark showers at Belle II

Bernreuther

Böse

Hearty

et al. 2022

J. High Energ. Phys.

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Dark showers from strongly interacting dark sectors that confine at the GeV scale can give rise to novel signatures at e+e− colliders. In this work, we study the sensitivity of B factory experiments to dark showers produced through an effective interaction arising from a heavy off-shell mediator. We show that a prospective search for displaced vertices from GeV-scale long-lived particles at Belle II can improve the sensitivity to dark showers substantially compared to an existing search at BaBar. We compare the sensitivity of searches for displaced signals to searches for promptly produced resonances at BaBar and KLOE and calculate sensitivity projections for a single-photon search at Belle II to invisible dark showers produced through an effective interaction. The underlying structure of the effective interaction can be resolved at higher-energy experiments, where the mediator can be produced on-shell. To study the resulting constraints, we update electroweak precision bounds on kinetically mixed Z′ bosons and reinterpret a search for low-mass di-muon resonances at LHCb in terms of dark showers. We find that LHCb and Belle II are most sensitive to different particle decay lengths, underscoring the complementarity of LHC and intensity frontier experiments.

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“…in the context of twin Higgs models [11,12,13,14], composite and/or asymmetric dark matter scenarios [15,16,17,18,19,20,21,22,23,24,5,25,26,27], and string theory [28,29]. Some studies focusing on hidden valley phenomenology can be found in [30,31,32,33,34,35,36,10,37,38,39,40,41,42,6,43].…”

Section: Introductionmentioning

confidence: 99%

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

Albouy,

Barron,

Beauchesne

et al. 2022

Preprint

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.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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Classification of dark pion multiplets as dark matter candidates and collider phenomenology

Cited by 17 publications

References 101 publications

Split SIMPs with decays

Split SIMPs with decays

Forecasting dark showers at Belle II

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

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