FACET: A new long-lived particle detector in the very forward region of the CMS experiment

Cerci, S.; Cerci, D. Sunar; Lazic, D.; Landsberg, G.; Cerutti, F.; Sabate-Gilarte, M.; Albrow, M. G.; Berryhill, J.; Green, D. R.; Hirschauer, J.; Kulkarni, S.; Brucken, J. E.; Emediato, L.; Mestvirishvili, A.; Nachtman, J.; Onel, Y.; Penzo, A.; Aydilek, O.; Hacisahinoglu, B.; Ozkorucuklu, S.; Sert, H.; Simsek, C.; Zorbilmez, C.; Hos, I.; Hadley, N.; Skuja, A.; Du, M.; Fang, R.; Liu, Z.; Isildak, B.; Tran, V. Q.

doi:10.48550/arxiv.2201.00019

Cited by 10 publications

(21 citation statements)

References 56 publications

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“…The author thanks all the members of the FACET developing team, named as co-authors of Ref. [3]. We acknowledge valuable input from V. Baglin and P. Fessia (CERN) on the LHC pipe and infrastructure and V. Kashikhin (Fermilab) on the preliminary toroid design.…”

Section: Acknowledgementsmentioning

confidence: 99%

“…A description and more details of the physics potential are given in Ref. [3].We can compare FACET to the pioneering FASER experiment [4] which is approved to search for LLPs in the very forward direction in Run 3, and an upgrade FASER-2 [5] which is being developed for Run 4. Major differences with FACET are (a) FASER-2 is 480 m from IR5 (with ATLAS) while FACET is 100 -127 m from IR1 (with CMS).…”

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confidence: 99%

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The FACET Project: Forward Aperture CMS ExTension to search for new Long-Lived Particles

Albrow

2022

Preprint

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FACET is a proposed new subsysem for CMS to search for portals such as dark photons, dark higgs, heavy neutral leptons and axion-like particles in the very forward direction at the High Luminosity LHC. Such particles can penetrate up to 50 m of iron and then decay inside a 14 m 3 vacuum pipe made by enlarging an 18 m long section of the LHC pipe to a radius of 50 cm. IntroductionFACET, short for Forward Aperture CMS ExTension, is a project under development to add a subsystem to CMS to search for beyond the standard model (BSM) long-lived particles (LLPs) in the high luminosity era of the LHC, in Run 4 (2028) and beyond. The project was initiated with a two-day meeting in April 2020 [1, 2], with one day discussing a forward hadron spectrometer for strong interaction physics, and one day on searching for long-lived particles. A description and more details of the physics potential are given in Ref. [3].We can compare FACET to the pioneering FASER experiment [4] which is approved to search for LLPs in the very forward direction in Run 3, and an upgrade FASER-2 [5] which is being developed for Run 4. Major differences with FACET are (a) FASER-2 is 480 m from IR5 (with ATLAS) while FACET is 100 -127 m from IR1 (with CMS). (b) FACET has 4× the solid angle: 54.5 µsr cf. 13.6 µsr. (c) FASER-2 has a 5 m-long decay volume; FACET has 18 m which is evacuated to eliminate background from particle interactions. (d) FASER-2 is centered at polar angle θ = 0 • while FACET covers 1 mrad < θ < 4 mrad. (e) FASER-2 is behind ∼ 100 m of rock absorber while FACET has ∼ 50 m of iron. However FACET is located inside the main LHC tunnel where radiation levels are much higher while FASER is located in a side tunnel.An important difference is that FASER is an independent experiment while FACET is not; it is proposed to be a new subsystem of CMS, fully integrated and using the same advanced technology for its detectors. This has the added benefit of allowing the study of correlations with the central event, and enables a standard model physics program especially in low pileup pp, pA and AA collisions.

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Section: Acknowledgementsmentioning

confidence: 99%

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confidence: 99%

The FACET Project: Forward Aperture CMS ExTension to search for new Long-Lived Particles

Albrow

2022

Preprint

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“…These experiments would use 3 orders of magnitude larger flux of mesons B, D to produce HNLs. The (incomplete) list includes SHiP [21], SHADOWS [22] FASER [23,24], MATHUSLA [25], FACET [26], CODEX-b [27], ANUBIS [28], AL3X [29]. One of the strongest potential to probe HNLs with the mixing angles close to the seesaw bound has SHiP.…”

Section: Introductionmentioning

confidence: 99%

Exploring the potential of FCC-hh to search for particles from $B$ mesons

Boyarsky¹,

Mikulenko²,

Ovchynnikov³

et al. 2022

Preprint

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The Future Circular Collider (FCC-hh) is a proposed successor of the Large Hadron Collider (LHC). FCC-hh would push both the energy and intensity frontiers of searches for new physics particles. In particular, due to higher energy and luminosity than at the LHC, at FCC-hh there would be produced around 30 times larger amount of B mesons and 120 times of W bosons, which then may decay into feebly interacting particles. In this paper we demonstrate the potential of FCC-hh by studying its sensitivity to heavy neutral leptons (HNLs) with masses m N < m B . We consider various locations of a displaced decay volume embedded in the planned infrastructure of FCC-hh. We demonstrate that FCC-hh may substantially improve the reach of the parameter space of HNLs as compared to the searches proposed at the LHC.

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“…At hadron colliders like the LHC, dark U(1) X gauge bosons of mass m X can be abundantly produced through proton bremsstrahlung or via the decay of heavy mesons. Indeed, over the lifetime of the HL-LHC there will be 4×10 17 neutral pions, 6×10 16 η mesons, 2×10 15 D mesons, and 10 13 B mesons produced in the direction of FASER2. The U(1) X discovery potential of FASER2 in the (m X , g X,eff ) plane is shown in Fig.…”

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confidence: 99%

“…coupled U(1) gauge bosons could be carried out by the proposed LHC experiments SHiP [14], FACET [15], and MATH-USLA [16].…”

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confidence: 99%

Anomalous U(1) Gauge Bosons and String Physics at the Forward Physics Facility

Anchordoqui,

Antoniadis,

Benakli

et al. 2022

Preprint

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FACET: A new long-lived particle detector in the very forward region of the CMS experiment

Cited by 10 publications

References 56 publications

The FACET Project: Forward Aperture CMS ExTension to search for new Long-Lived Particles

The FACET Project: Forward Aperture CMS ExTension to search for new Long-Lived Particles

Exploring the potential of FCC-hh to search for particles from $B$ mesons

Anomalous U(1) Gauge Bosons and String Physics at the Forward Physics Facility

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