A facility to search for hidden particles at the CERN SPS: the SHiP physics case

By S. Alekhin, W. Altmannshofer, T. Asaka, B. Batell, Fedor Bezrukov, K. Bondarenko, Alexey Boyarsky, Kiwoon Choi, C. Corral, N. Craig and 75 more. Reports on progress in physics. Physical Society, 2015

847 citations recorded by the source corpus.

This paper describes the physics case for a new fixed target facility at CERN SPS. The SHiP (search for hidden particles) experiment is intended to hunt for new physics in the largely unexplored domain of very weakly interacting particles with masses below the Fermi scale, inaccessible to the LHC experiments, and to study tau neutrino physics. The same proton beam setup can be used later to look for decays of tau-leptons with lepton flavour number non-conservation, τ→3μ and to search for weakly-interacting sub-GeV dark matter candidates. We discuss the evidence for physics beyond the standard model and describe interactions between new particles and four different portals—scalars, vectors, fermions or axion-like particles. We discuss motivations for different models, manifesting themselves via these interactions, and how they can be probed with the SHiP experiment and present several case studies. The prospects to search for relatively light SUSY and composite particles at SHiP are also discussed. We demonstrate that the SHiP experiment has a unique potential to discover new physics and can directly probe a number of solutions of beyond the standard model puzzles, such as neutrino masses, baryon asymmetry of the Universe, dark matter, and inflation.

Subfields: Artificial Intelligence, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/79242247a989fb3ecc8e0ff322fec504a772ede1

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Citations in the corpus

Sensitivity of the SHiP experiment to Heavy Neutral Leptons (2018, background): “Among hypothetical long-lived particles that can be probed by the SHiP experiment are Heavy Neutral Leptons (or HNLs) [6].”
Neutrino non-standard interactions: A status report (2019, background): “There have been on-going experimental efforts in several directions, most notably the neutrinoless double beta decay experiments (0νββ), both current [83–86] and upcoming [87–89], as well as proposed general purpose fixed-target facilities [90, 91].”
Deep Underground Neutrino Experiment (DUNE), Far Detector Technical Design Report, Volume II: DUNE Physics (2020, methodology): “The sensitivity for DUNE ND is compared to the predictions of future experiments, SBN [516] (blue), SHiP [517] (red), NA62 [518] (green), MATHUSLA [519] (purple), and the Phase II of FASER [520].”
Cosmological constraints on exotic injection of electromagnetic energy (2016, background): “This is nicely reviewed in [58], notably in its chapter 4.”
Lepton Number Violation: Seesaw Models and Their Collider Tests (2017, background): “To this end, there have been on-going efforts in several directions, most notably the neutrinoless double beta (0νββ)-decay experiments, both current [36–39] and upcoming [40–42], as well as proposed general purpose fixed-target facilities [43, 44].”
Revised constraints and Belle II sensitivity for visible and invisible axion-like particles (2017, background): “ts. Our study demonstrates that BelleII can already explore new parameter space with early data and in the long run will be highly complementary to future searches for ALPs at the LHC [28] or at SHiP [22,48]. We conclude that BelleII therefore possesses a unique opportunity to discover both visibly ”