Forecasting dark showers at Belle II

Bernreuther, Elias; Böse, Kai; Hearty, C.; Kahlhoefer, Felix; Morandini, Alessandro; Schmidt-Hoberg, Kai

doi:10.1007/jhep12(2022)005

Cited by 9 publications

(3 citation statements)

References 78 publications

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“…Dark photons are produced via initial state radiation, and then decay either invisibly or to a pair of leptons or other standard model particles. Partially visible decays are also possible in slightly more complicated cases, such as indirect dark matter [577], or dark showers [1225]. Both of these involve displaced vertices, which significantly reduces Standard Model backgrounds.…”

Section: Dark Photonsmentioning

confidence: 99%

Feebly-interacting particles: FIPs 2020 workshop report

et al. 2021

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With the establishment and maturation of the experimental programs searching for new physics with sizeable couplings at the LHC, there is an increasing interest in the broader particle and astrophysics community for exploring the physics of light and feebly-interacting particles as a paradigm complementary to a New Physics sector at the TeV scale and beyond. FIPs 2020 has been the first workshop fully dedicated to the physics of feebly-interacting particles and was held virtually from 31 August to 4 September 2020. The workshop has gathered together experts from collider, beam dump, fixed target experiments, as well as from astrophysics, axions/ALPs searches, current/future neutrino experiments, and dark matter direct detection communities to discuss progress in experimental searches and underlying theory models for FIPs physics, and to enhance the cross-fertilisation across different fields. FIPs 2020 has been complemented by the topical workshop “Physics Beyond Colliders meets theory”, held at CERN from 7 June to 9 June 2020. This document presents the summary of the talks presented at the workshops and the outcome of the subsequent discussions held immediately after. It aims to provide a clear picture of this blooming field and proposes a few recommendations for the next round of experimental results.

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Section: Dark Photonsmentioning

confidence: 99%

Feebly-interacting particles: FIPs 2020 workshop report

et al. 2021

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“…6). Other cases are also studied, such as indirect dark matter [11], dark showers [12], or production in association with a dark Higgs [13], but are not discussed here. Belle II is near-total upgrade of the original Belle experiment [14].…”

Section: Belle IImentioning

confidence: 99%

Searches for dark photons at accelerators

Hearty

2022

J. Phys.: Conf. Ser.

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Dark sector models attempt to describe observed dark matter properties, as well as other anomalies such as muon (g − 2), possible violations of lepton universality in B decay, and the possible observation of a new particle by the ATOMKI experiment. There is an extensive program of operating and proposed experiments to search for the new, low-mass, feebly-interacting particles predicted by such theories. I will focus on current searches at accelerators for dark photons, a component of many dark sector models. The results are interpreted in a basic model containing dark photons and dark matter.

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“…If the dark hadron in the final state is long-lived particle at the collider experiment scale and then decays back to SM particles, the dark shower will generate the novel emerging jet signature [11,[31][32][33][34][35][36][37]. If there are both stable and unstable dark hadrons in the final state, the dark shower will generate another special signature called the semivisible jet [11,30,35,[38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56]. If all dark hadrons promptly decay into SM particles, the resulting dark shower produces a distinctive signature known as a "dark jet" [34,35,57,58].…”

Section: Introductionmentioning

confidence: 99%

Probing dark QCD sector through the Higgs portal with machine learning at the LHC

Lu,

Lv,

Shen

et al. 2023

J. High Energ. Phys.

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The QCD-like dark sector with GeV-scale dark hadrons has the potential to generate new signatures at the Large Hadron Collider (LHC). In this paper, we consider a singlet scalar mediator in the tens of GeV-scale that connects the dark sector and the Standard Model (SM) sector via the Higgs portal. We focus on the Higgs-strahlung process, $$ q\overline{q} $$ q q ¯ ′ → W* → WH, to produce a highly boosted Higgs boson. Our scenario predicts two different processes that can generate dark mesons: (1) the cascade decay from the Higgs boson to two light scalar mediators and then to four dark mesons; (2) the Higgs boson decaying to two dark quarks, which then undergo a QCD-like shower and hadronization to produce dark mesons. We apply machine learning techniques, such as Convolutional Neural Network (CNN) and Energy Flow Network (EFN), to the fat-jet structure to distinguish these signal processes from large SM backgrounds. We find that the branching ratio of the Higgs boson to two light scalar mediators can be constrained to be less than about 10% at 14 TeV LHC with $$ \mathcal{L} $$ L = 3000 fb−1.

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Forecasting dark showers at Belle II

Cited by 9 publications

References 78 publications

Feebly-interacting particles: FIPs 2020 workshop report

Feebly-interacting particles: FIPs 2020 workshop report

Searches for dark photons at accelerators

Probing dark QCD sector through the Higgs portal with machine learning at the LHC

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