https://doi.org/10.1140/epjc/s10052-020-08711-3
Special Article – Tools for Experiment and Theory
Expression of interest for the CODEX-b detector
1
Università e INFN Sezione di Roma Tor Vergata, Rome, Italy
2
INFN Sezione di Roma Tor Vergata, Rome, Italy
3
LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
4
Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
5
European Organization for Nuclear Research (CERN), Geneva, Switzerland
6
ELTE Eötvös Loránd University, Budapest, Hungary
7
Department of Physics, University of Cincinnati, 45221, Cincinnati, OH, USA
8
University of Birmingham, Birmingham, UK
9
School of Natural Sciences, Institute for Advanced Study, 08540, Princeton, NJ, USA
10
Kyungpook National University (KNU), Daegu, South Korea
11
Ernest Orlando Lawrence Berkeley National Laboratory, University of California, 94720, Berkeley, CA, USA
12
Walter Burke Institute for Theoretical Physics, California Institute of Technology, 91125, Pasadena, CA, USA
13
Département de Physique de l’Ecole Normale Supérieure, LPENS, Paris, France
14
Department of Physics, University of California, 94720, Berkeley, CA, USA
15
INFN Sezione di Roma La Sapienza, Rome, Italy
16
Laboratory for Nuclear Science, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA
17
University of Cincinnati, 45221, Cincinnati, OH, USA
Received:
13
April
2020
Accepted:
25
November
2020
Published online:
21
December
2020
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-, 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-
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.
© The Author(s) 2020
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