Welcome to the CODEX-b webpage


The primary LHC experiments (ATLAS, CMS, LHCb, ALICE) have proven to be remarkably versatile and complementary in their BSM reach. As these experiments are scheduled for upgrades and data collection over at least another 15 years, it is natural to consider whether they can be further complemented by one or more detectors specialized for well-motivated but currently hard-to-detect BSM signatures. A compelling category of such signatures are long-lived particles (LLPs), which generally appear in any theory containing a hierarchy of scales or small parameters, and are therefore ubiquitous in BSM scenarios.

The central challenge in detecting LLPs is that not only their masses but also their life times may span many orders of magnitude. This makes it impossible from first principles to construct a single detector which would have the ultimate sensitivity to all possible LLP signatures.

This twiki serves as the homepage for the proposed CODEX-b (COmpact Detector for EXotics at LHCb) experiment, a LLP detector that would be installed in the DELPHI/UXA cavern next to LHCbs interaction point (IP8). In addition to the detector proposed for Runs 4 and 5 of the LHC, this page also serves as the home for the CODEX-β detector that is proposed for Run 3. The central advantages of the CODEX family of detectors are:

  • Very competitive sensitivity to a wide range of LLP models, either exceeding or complementary to the sensitivity of other existing or proposed detectors.
  • An achievable zero background environment, as well as an accessible experiment allocation in the DELPHI/UXA cavern with all necessary services already in place.
  • Straightforward integration into LHCbs trigger-less readout and the ability to tag events of interest with the LHCb detector.
  • A compact size and consequently modest cost, with the realistic possibility to extend detector capabilities for neutral particles.

Please see the links below for more information.


Public presentations

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Topic revision: r8 - 2019-12-09 - NigelWatson
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