CERN Accelerating science

Article
Report number	arXiv:1911.00481
Title	Expression of Interest for the CODEX-b Detector
Author(s)	Aielli, Giulio (INFN, Rome2 ; Rome U., Tor Vergata) ; Ben-Haim, Eli (Paris U., VI-VII) ; Cardarelli, Roberto (INFN, Rome2) ; Charles, Matthew John (Paris U., VI-VII) ; Cid Vidal, Xabier (Santiago de Compostela U., IGFAE) ; Coco, Victor (CERN) ; Dey, Biplab (CCNU, Wuhan, Inst. Part. Phys.) ; Dumps, Raphael (CERN) ; Evans, Jared A. (Cincinnati U.) ; Gibbons, George (Birmingham U.) ; Le Dortz, Olivier (Paris U., VI-VII) ; Gligorov, Vladimir V. (Paris U., VI-VII) ; Ilten, Philip (Birmingham U.) ; Knapen, Simon (Princeton, Inst. Advanced Study) ; Lee, Jongho (CERN ; Kyungpook Natl. U.) ; Soliño, Saul López (Santiago de Compostela U., IGFAE) ; Nachman, Benjamin (LBL, Berkeley) ; Papucci, Michele (LBL, Berkeley ; Caltech) ; Polci, Francesco (Paris U., VI-VII) ; Quessard, Robin (Ecole Normale Superieure, CNRS) ; Ramani, Harikrishnan (LBL, Berkeley ; UC, Berkeley) ; Robinson, Dean J. (LBL, Berkeley) ; Schindler, Heinrich (CERN) ; Sokoloff, Michael D. (Cincinnati U.) ; Swallow, Paul (Birmingham U.) ; Vari, Riccardo (INFN, Rome) ; Watson, Nigel (Birmingham U.) ; Williams, Mike (MIT, LNS)
Publication	2020-12-21
Imprint	2019-11-01
Number of pages	47
Note	99 pages, 36 figures. Journal version
In:	Eur. Phys. J. C 80 (2020) 1177
DOI	10.1140/epjc/s10052-020-08711-3
Subject category	hep-ph ; Particle Physics - Phenomenology ; hep-ex ; Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; LHCb
Abstract	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-$\beta$, 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-$\beta$ 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.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © 2020-2024 The Author(s) (License: CC-BY-4.0), sponsored by SCOAP³

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