Abstract
Run 5 of the high-luminosity LHC era (and beyond) may provide new opportunities to search for physics beyond the standard model at interaction point 2. In particular, taking advantage of the existing ALICE detector and infrastructure provides an opportunity to search for displaced decays of beyond standard model long-lived particles. While this proposal may well be preempted by ongoing ALICE physics goals, examination of its potential new physics reach provides a compelling comparison with respect to other long-lived particle proposals. In particular, full event reconstruction and particle identification could be possible by making use of the existing L3 magnet and ALICE time projection chamber. For several well-motivated portals, the reach competes with or exceeds the sensitivity of MATHUSLA and SHiP, provided that a total integrated luminosity of approximately $100\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ could be delivered to interaction point 2.
Highlights
Interaction point 2 (IP2) at the LHC accelerator complex is currently used by the ALICE experiment [1] for the study of the quark-gluon plasma at high temperatures
The ALICE experiment comprises in part a gas time projection chamber (TPC) detector housed within the L3 electromagnet [5] and is designed to reconstruct very high multiplicities of tracks from ultrarelativistic ion-ion collisions
The potential strength of an experiment like AL3X lies in its versatility over a wide mass range of long lived particles (LLPs) portals; thanks to its short baseline near a LHC interaction point, it can
Summary
Interaction point 2 (IP2) at the LHC accelerator complex is currently used by the ALICE experiment [1] for the study of the quark-gluon plasma at high temperatures (examples of high temperature QCD discoveries achieved by ALICE can be found in, e.g., Refs. [2,3]). The proximity of the proposed detector to a LHC interaction point, with a considerable geometric acceptance, permits sensitivity to LLPs generated by high center-of-mass energy portals such as the Higgs invisible width and from low scale vector, scalar, or fermion mixing portals, thereby covering all possible renormalizable couplings of the SM to exotic sectors in one detector concept. In this proof-ofconcept study, we examine the AL3X reach for a LLP produced in an exotic Higgs or B decay as well as for the production of a kinetically mixed dark photon. Much of our discussion will be informed by those applicable to the MATHUSLA [18] and CODEX-b [22] proposals, though the challenges from backgrounds will be significantly different from the former and somewhat different from the latter
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