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Open Access Publications from the University of California

Expression of interest for the CODEX-b detector

  • Author(s): Aielli, G;
  • Ben-Haim, E;
  • Cardarelli, R;
  • Charles, MJ;
  • Cid Vidal, X;
  • Coco, V;
  • Dey, B;
  • Dumps, R;
  • Evans, JA;
  • Gibbons, G;
  • Dortz, OL;
  • Gligorov, VV;
  • Ilten, P;
  • Knapen, S;
  • Lee, J;
  • López Soliño, S;
  • Nachman, B;
  • Papucci, M;
  • Polci, F;
  • Quessard, R;
  • Ramani, H;
  • Robinson, DJ;
  • Schindler, H;
  • Sokoloff, MD;
  • Swallow, P;
  • Vari, R;
  • Watson, N;
  • Williams, M
  • et al.

This document presents the physics case and ancillary studies for the proposed CODEX-b long-lived particle (LLP) detector, as well as for a smaller proof-of-concept demonstrator detector, CODEX-β, to be operated during Run 3 of the LHC. Our development of the CODEX-b physics case synthesizes ‘top-down’ and ‘bottom-up’ theoretical approaches, providing a detailed survey of both minimal and complete models featuring LLPs. Several of these models have not been studied previously, and for some others we amend studies from previous literature: In particular, for gluon and fermion-coupled axion-like particles. We moreover present updated simulations of expected backgrounds in CODEX-b’s actively shielded environment, including the effects of shielding propagation uncertainties, high-energy tails and variation in the shielding design. Initial results are also included from a background measurement and calibration campaign. A design overview is presented for the CODEX-β demonstrator detector, which will enable background calibration and detector design studies. Finally, we lay out brief studies of various design drivers of the CODEX-b experiment and potential extensions of the baseline design, including the physics case for a calorimeter element, precision timing, event tagging within LHCb, and precision low-momentum tracking.

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