Conveners
New ideas in LLP phenomenology: Session 1
- Audrey Kvam (University of Massachusetts (US))
- José Francisco Zurita (IFIC - Univ. of Valencia and CSIC (ES))
New ideas in LLP phenomenology: Session 2
- Mason Proffitt (University of Washington (US))
- José Francisco Zurita (IFIC - Univ. of Valencia and CSIC (ES))
New ideas in LLP phenomenology: Session 3
- Louis Henry (EPFL - Ecole Polytechnique Federale Lausanne (CH))
- Juliette Alimena (DESY)
New ideas in LLP phenomenology: Session 4
- Louis Henry (EPFL - Ecole Polytechnique Federale Lausanne (CH))
- Juliette Alimena (DESY)
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Jan Hajer (Universidade de Lisboa)20/06/2023, 13:00
The heavy neutrino Majorana mass term appearing in low-scale seesaw models violates lepton number. Therefore, heavy neutral leptons are not only characterised by their mass and coupling strength but also by the amount of lepton number violation they induce. I discuss the merits of different benchmark models for this scenario and present the potential to measure lepton number violation in...
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Rebeca Beltran (IFIC (CSIC-UV))20/06/2023, 13:20
This work presents a simple and quick method to reinterpret models predicting long-lived particles (LLPs) produced from meson decays. The proposed method avoids the need for Monte-Carlo simulations and the implementation of detector geometries and experimental cuts, significantly reducing the computation time of typical recasting and reinterpretation works. The only required inputs are...
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Baibhab Pattnaik (IFIC (University of Valencia, CSIC))20/06/2023, 13:40
In this talk, we discuss the possibility of testing Heavy Neutral Leptons (HNLs) in "cosmic ray beam-dumps": setups where high-energy incident cosmic rays impinge on the Earth's atmosphere and then on the Earth's surface. We focus on HNL production from atmospherically produced parent meson decays and discuss these in the context of a possible explanation of the appearing Cherenkov showers...
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Wenjie Huang20/06/2023, 14:00
Modern-day accelerator neutrino facilities are excellent venues for searches for new-physics particles. Many distinct new-physics models predict overlapping signatures and phenomenology in these experiments. In this work, we advocate for the adoption of simplified frameworks when studying these types of new-physics signatures, which are characterized by a small number of primary variables,...
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Juliana Carrasco (IFIC (UV-CSIC))20/06/2023, 14:20
A strongly interacting dark sector with long-lived dark mesons (lifetimes between few centimeters and few meters) can give rise to emerging jets, which have been sought by the CMS collaboration.
In this talk I would describe the validation of the CMS emerging jet search using the publicly available material. We will interpretate this search in the context of Exotic Higgs decays, setting...
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Martin Schürmann20/06/2023, 15:10
In supersymmetric models with R-parity-violation (RPV), light neutralinos with masses in the GeV-scale or below that are necessarily bino-like are still allowed by various constraints, as they decay via RPV couplings. These RPV couplings are in general constrained to be small, and hence such light binos, if produced e.g. at a beam-dump or collider experiment, appear as displaced vertices or...
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Lovisa Rygaard (Deutsches Elektronen-Synchrotron (DE))20/06/2023, 15:30
We investigate the discovery potential for long-lived particles produced in association with a top-antitop quark pair at the (High-Luminosity) LHC. Compared to inclusive searches for a displaced vertex, top-associated signals offer new trigger options and an extra handle to suppress background. We propose a search strategy for a displaced di-muon vertex decaying in the tracking chambers,...
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Wei Su (Sun Yat-sen University)20/06/2023, 15:50
In this talk, I will show the prospect of detecting light CP-even and CP-odd scalars at FASER and FASER 2. Considering a model-independent framework describing the most general interactions between a CP-even or CP-odd scalar and SM particles using the notation of coupling modifiers in the effective Lagrangian, we develop the general formalism for scalar production and decay. We then analyze...
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Elias Bernreuther (Fermilab)20/06/2023, 16:10
Long-lived particles are a prime target of searches in current and upcoming LHC runs. In my talk, I will discuss a renormalizable theory that includes a heavy weak- singlet vectorlike lepton that decays into a long-lived pseudoscalar boson and a tau lepton. I will show that this can be the dominant decay mode of the vectorlike lepton provided the pseudoscalar couplings deviate from the case of...
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Jan Hajer (Universidade de Lisboa)23/06/2023, 10:00
The LHC experiments collect not only the well-known proton-proton collision data but additionally also parking and scouting datasets as well as heavy-ion and low-pileup data. These datasets have a mild $p_T$ trigger threshold in common which might be beneficial for soft and long-lived new physics searches. I compare the discovery potential of such datasets using a GeV scale long-lived...
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Wei Liu (Nanjing University of Science and Technology)23/06/2023, 10:20
We discuss the potential of using detectors aimed for searching long-lived particles~(LLP) at the high-luminosity LHC run, to probe the neutrino dipole models. This is achieved by taking the heavy neutral leptons~(HNL) of the models as candidates of the LLPs. Taking into account the dipole couplings to the weak bosons, $d_{W,Z}$, which control the production of the HNLs at the LHC, we discuss...
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Zeren Simon Wang (National Tsing Hua University)23/06/2023, 11:10
Two classes of far detectors have been proposed or are under operation at the LHC.
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The first class is a series of neutrino detectors that are sensitive to light active neutrinos via either charged-current or neutral-current interactions; exemplary ideas are FASER$\nu$, SND@LHC, and FLArE. Another type aims primarily at looking for displaced decays of long-lived particles (LLPs) into charged... -
Clare Burrage (University of Nottingham), Spyros Argyropoulos (Albert Ludwigs Universitaet Freiburg (DE))23/06/2023, 11:30
Dynamical theories of dark energy predict new degrees of freedom with particular environmental sensitivity to avoid constraints on fifth forces. We show that the similar, yet complementary multi-purpose detector setup of the ATLAS and CMS experiments provides a unique opportunity to place sensitivity on such scenarios in a narrow, yet relevant parameter range. Furthermore, our investigation...
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