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Annapaola De Cosa (ETH Zurich (CH))21/01/2025, 14:00
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Tim Cohen (CERN)21/01/2025, 14:10
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Jackson Carl Burzynski (Simon Fraser University (CA))21/01/2025, 14:40
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Dr Roberto Seidita (ETH Zurich (CH))21/01/2025, 15:00
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21/01/2025, 15:20
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Bingxuan Liu (Sun Yat-Sen University (CN))21/01/2025, 16:20
e investigate the potential to search for semi-visible jets (SVJs) at the Large Hadron Collider (LHC) using initial-state radiation (ISR). Both photon ISR and jet ISR channels are considered, using a benchmark signal model with the decay of a leptophobic Z′ mediator forming two SVJs. We compare and extend several techniques to decompose the missing transverse momentum into per-jet...
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Cesare Tiziano Cazzaniga (ETH Zurich (CH))21/01/2025, 16:32
The Hidden Valley scenario consists of a set of models where the Standard Model is accompanied by a Hidden Sector and connected with it via a heavy mediator or a weak coupling. If realised in nature, the Hidden Valley scenario may result in unusual and little-studied phenomena at the LHC. Under the assumption of a QCD-like confining dark sector, novel experimental signatures emerge,...
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Filippo Sala (University of Bologna and INFN)21/01/2025, 16:45
I will show how collider searches for long-lived particles (LLPs) can test the dynamics responsible for matter domination in the early universe. In particular I will focus on long-lived glueballs from a GeV-scale confining dark sector, of relevance for this workshop. After a summary of their cosmology, I will prove that searches of glueballs, from decays of the Higgs or other particles, test...
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Clarisse Prat21/01/2025, 17:05
We look at the constraints we get from SM measurements on resonant and non-resonant production modes of semi-visible jets by running CONTUR. By varying several parameters in both channels, we can investigate the kinematics behind the exclusions and see the merit in using reinterpretation tools in developing search strategies/phenomenological studies.
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Thomas Wojtkowski (LPSC - Centre National de la Recherche Scientifique (FR))21/01/2025, 17:17
In this contribution, we will present our recent studies on the recasting of the different LHC darkQCD analyses using MadAnalysis5. The reinterpretation was done in the context of dark shower models focussing on semi-visible jet resonances.
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Abhishek Iyer (IIT Delhi)21/01/2025, 17:29
We consider the prospect of the SM as a composite of a new fundamental fermionic sector ($q_{TC}$). Such scenarios can be considered as QCD-like, where the hadronization scale $\Lambda_{TC}\sim$ few TeV. The study of $q\bar q\rightarrow q_{TC}\bar q_{TC} $ at 100 TeV at FCC-hh has a direct analogue to the study of $e^+e^-\rightarrow q\bar q$ at around few GeV at LEP. While the latter...
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Yi-Mu Chen (KIT - Karlsruhe Institute of Technology (DE))21/01/2025, 17:41
Current search efforts for flavored dark sectors that couple to multiple SM quarks flavors has only included the coupling to isospin –½ SM quarks using the emerging jet signature. A natural extension to such models would be to change the coupling to isospin +½ SM quark. In particular, the coupling to SM top quarks allows for electroweak-like event selection and triggers to be used, opening...
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Abhijith Gandrakota (Fermi National Accelerator Lab. (US))21/01/2025, 17:53
The Higgs boson offers a unique portal to hidden sectors, enabling the study of Higgs-mediated dark showers (DS). These processes, characterized by multi-quark final states, present distinct yet elusive signatures due to their resemblance to QCD backgrounds. Using perturbative parton shower models, as detailed in recent theoretical benchmarks, we investigate DS phenomena initiated by the Higgs...
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Dominic William Stafford (Deutsches Elektronen-Synchrotron (DE))22/01/2025, 14:00
We present the new implementation of Dark Showers in the Herwig 7 generator. This implementation features for the first time an angular ordered dark shower and dark hadronisation implemented via the cluster hadronisation model. This talk will cover the scale hierarchies involved in dark shower models, and how to pick sensible values for generator parameters based on these scales. Secondly, the...
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Pedro Schwaller22/01/2025, 14:20
We present a minimal composite dark matter model, based on a SU(Nd) dark sector with nf dark quarks and a heavy t-channel mediator. For nf≥4, the dark flavor symmetry guarantees the stability of a subset of the dark pions, which serve as our dark matter candidates. Their relic abundance is determined by co-scattering or co-annihilation with the remaining dark pions, which are unstable and...
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Austin Batz (University of Oregon)22/01/2025, 14:40
The pure-glue limit of confining dark sectors reveals new insights into dark shower phenomenology. When the dark quark masses and the scale of a collider's hard interactions that produce the dark sector are significantly larger than the dark confinement scale, there is a dark gluon shower that produces only dark glueballs. These glueballs can then decay to the Standard Model with lifetimes...
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Ms Zofia Borowska22/01/2025, 15:00
We explored a darkQCD model of the hadronization of dark gluons into dark glueballs to generate semi-visible jet signature. We considered two portal particles, a Higgs and a Z’. Trying to generate the SVJ signature with the Higgs mediator, we found the expected signature, but with an extremely low cross-section, to the order of 10^-9 pb. It was not possible to generate the signature with the...
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Emre Sitti (ETH Zurich (CH))22/01/2025, 15:12
Dark showers arising from the Higgs coupling to a strongly confined dark
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sector present a unique avenue for exploring new physics signatures.
Within the FCC-ee framework, this model is being studied,
highlighting the production of semi-visible jets (SVJs) enriched with
photons and leptons. These signatures, featuring displaced decays and
complex jet structures, demand tailored... -
Sophie Alice Renner (University of Glasgow (GB))22/01/2025, 15:50
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Matthew Strassler (Rutgers University)22/01/2025, 16:10
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Deepak Kar (University of the Witwatersrand (ZA))22/01/2025, 16:50
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Kevin Pedro (Fermi National Accelerator Lab. (US))22/01/2025, 17:00
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22/01/2025, 17:10
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Wei Liu (Nanjing University of Science and Technology)23/01/2025, 14:00
We demonstrate the sensitivity of the CMS search at the high luminosity LHC run for long-lived particles for Hidden Valley scenarios. We use a theoretically consistent parametrisation of the Hidden Valley parameters to establish our simulation setup. We also adopt a hybrid strategy and establish upper limits on the Hidden Valley production cross section as a function of the model parameters...
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Pedro De la Torre Luque (Institute of theoretical physics (IFT-UAM))23/01/2025, 14:20
The creation of anti-nuclei in the Galaxy has been discussed as a possible signal of exotic production mechanisms such as primordial black hole evaporation or dark matter decay/annihilation in addition to the more conventional production from cosmic-ray interactions. Tentative observations of cosmic-ray andideuteron and antihelium by the AMS-02 collaboration have re-energized the quest to use...
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Caterina Doglioni (The University of Manchester (GB))23/01/2025, 14:40
With this talk, we would like to introduce the initiative for Dark Matter in Europe and beyond (iDMEu) and the ESCAPE Dark Matter Science Project. iDMEu is an initiative hosted by JENA (Joint ECFA, NuPECC and APPEC), and takes shape as a collective effort by a group of particle and astroparticle physicists to set up an online resource meta-repository, a common discussion platform and a series...
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23/01/2025, 15:00
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Sukanya Sinha (The University of Manchester (GB))23/01/2025, 17:15
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Annapaola De Cosa (ETH Zurich (CH)), Deepak Kar (University of the Witwatersrand (ZA)), Felix Kahlhoefer (Karlsruhe Institute of Technology), Jackson Carl Burzynski (Simon Fraser University (CA)), Jannicke Pearkes (University of Colorado Boulder (US)), Kevin Pedro (Fermi National Accelerator Lab. (US)), Marcella Bona (Queen Mary University of London (UK)), Suchita Kulkarni (University of Graz), Sukanya Sinha (The University of Manchester (GB)), Tim Cohen (CERN)23/01/2025, 17:30
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Deepak Kar (University of the Witwatersrand (ZA))
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Emre Sitti (ETH Zurich (CH))
Dark showers arising from the Higgs coupling to a strongly confined dark
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sector present a unique avenue for exploring new physics signatures.
Within the FCC-ee framework, this model is being studied,
highlighting the production of semi-visible jets (SVJs) enriched with
photons and leptons. These signatures, featuring displaced decays and
complex jet structures, demand tailored... -
Kevin Pedro (Fermi National Accelerator Lab. (US))
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Dominic William Stafford (Deutsches Elektronen-Synchrotron (DE))
We present an ongoing effort to compare the new Herwig Dark Showers code with the existing Pythia Hidden Valley module. In addition to the physical parameters of the model, an event generator requires a number of semi-empirical settings to be tuned, particularly in the hadronisation. Since no dark showers have yet been observed, the best choices for these parameters can only be estimated using...
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Matthew Strassler (Rutgers University)
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Caterina Doglioni (The University of Manchester (GB))
With this talk, we would like to introduce the idea of using the dark showers HepMC files produced in this effort as a test case to exercise the (distributed) computing machinery that would allow ATLAS and CMS to share HepMC files.
If this works and there are no drawbacks to implementation even for large-scale samples, there are the following benefits:
- ATLAS and CMS are able to...
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Sukanya Sinha (The University of Manchester (GB))
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Caterina Doglioni (The University of Manchester (GB))
With this talk, we would like to introduce the initiative for Dark Matter in Europe and beyond (iDMEu) and the ESCAPE Dark Matter Science Project. iDMEu is an initiative hosted by JENA (Joint ECFA, NuPECC and APPEC), and takes shape as a collective effort by a group of particle and astroparticle physicists to set up an online resource meta-repository, a common discussion platform and a series...
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