The ALFA Roman Pot detectors of ATLAS

Khalek, S. Abdel; Allongue, B.; Anghinolfi, F.; Barrillon, P.; Blanchot, G.; Blin-Bondil, S.; Braem, A.; Chytka, L.; Muíño, P. Conde; Düren, M.; Fassnacht, P.; Franz, S.; Gurriana, L.; Grafström, P.; Heller, M.; Haguenauer, M.; Hain, W.; Hamal, P.; Hiller, K. H.; Iwański, W.; Jakobsen, S.; Joram, C.; Kötz, U.; Korcyl, K.; Kreutzfeldt, K.; Löhse, T.; Maio, A.; Maneira, M.J.P.; Mapelli, A.; Notz, D.; Nožka, L.; Palma, A.; Petschull, D.; Pons, X.; Puzo, P.; Ravat, S.; Schneider, Thorsten; Seabra, L. F. Oleiro; Sýkora, T.; Staszewski, R.; Stenzel, H.; Trzebiński, M.; Valkár, Š.; Viti, M.; Vorobel, V.; Wemans, A. Do Valle

doi:10.1088/1748-0221/11/11/p11013

Cited by 40 publications

(31 citation statements)

References 13 publications

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“…This is not surprising, since new particles have traditionally been expected to be heavy. There are also experiments exploring the very forward region, including ATLAS/ALFA/AFP/ZDC [3][4][5], CMS/CASTOR/HFCAL [6], LHCf [7], and TOTEM [8], but their physics programs are typically thought of as complementary to those of ATLAS and CMS, focusing on standard model (SM) topics, such as the structure of the proton and hadronic interactions, and providing precise measurements of the LHC luminosity.…”

Section: Introductionmentioning

confidence: 99%

ForwArd Search ExpeRiment at the LHC

et al. 2018

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New physics has traditionally been expected in the high-p T region at high-energy collider experiments. If new particles are light and weakly coupled, however, this focus may be completely misguided: light particles are typically highly concentrated within a few mrad of the beam line, allowing sensitive searches with small detectors, and even extremely weakly coupled particles may be produced in large numbers there. We propose a new experiment, forward search experiment, or FASER, which would be placed downstream of the ATLAS or CMS interaction point (IP) in the very forward region and operated concurrently there. Two representative on-axis locations are studied: a far location, 400 m from the IP and just off the beam tunnel, and a near location, just 150 m from the IP and right behind the TAN neutral particle absorber. For each location, we examine leading neutrino-and beam-induced backgrounds. As a concrete example of light, weakly coupled particles, we consider dark photons produced through light meson decay and proton bremsstrahlung. We find that even a relatively small and inexpensive cylindrical detector, with a radius of ∼10 cm and length of 5-10 m, depending on the location, can discover dark photons in a large and unprobed region of parameter space with dark photon mass m A 0 ∼ 10-500 MeV and kinetic mixing parameter ϵ ∼ 10 −6 − 10 −3. FASER will clearly also be sensitive to many other forms of new physics. We conclude with a discussion of topics for further study that will be essential for understanding FASER's feasibility, optimizing its design, and realizing its discovery potential.

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Section: Introductionmentioning

confidence: 99%

ForwArd Search ExpeRiment at the LHC

et al. 2018

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“…Several more small detectors are located at large distances from the interaction point. The ALFA detector [4] using scintillator fibres is installed at ±237 m and ±241 m. The acceptance range of ALFA is approximately 9.6 < |η| < 12.4. The ATLAS Forward Proton detector (AFP) [5] is slightly closer, at ±205 m and ±217 m. Each of its arms has two stations, which comprise 4 planes of silicon pixel sensors and a Time-of-Flight detector.…”

Section: Atlas Detectormentioning

confidence: 99%

Recent minimum-bias measurements by ATLAS

Woźniak

2019

EPJ Web Conf.

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The Large Hadron Collider provides collisions of protons and nuclei at the highest energies available in the laboratory. A variety of recent results for minimum-bias pp, p+Pb and Pb+Pb collisions obtained by the ATLAS experiment is presented. For pp collisions they include the total and inelastic cross section, properties of minimum-bias events, underlying event characteristics and measurements of diffractive processes. The results for p+Pb and Pb+Pb collisions that are relevant for cosmic ray studies are also presented.

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“…Its aim is to measure neutral particles produced at very small angles, predominantly neutrons. The furthest detector is the Absolute Luminosity For ATLAS, ALFA [3], and is installed about 240 m from the IP. The newest detector the ATLAS Forward Proton, AFP [4], is presented in this article.…”

Section: Atlas and Forward Detectorsmentioning

confidence: 99%

AFP: first experience with data and future plans

Gach¹

2017

Proceedings of XXV International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2017)

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The ATLAS Forward Proton (AFP) detector system aims at the measurement of protons scattered diffractively or electromagnetically at very small angles. The first arm of the system was installed in 2016 and AFP took data in several commissioning and physics runs. The installation of the second arm is ongoing and will be completed in time for the 2017 data taking period. This will allow the measurements of processes with two tagged forward protons being a signature of: central diffraction, exclusive production, and two-photon processes. The early results and experience from the first year of data taking is presented together with the status of the secondarm installation and plans for the future.

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The ALFA Roman Pot detectors of ATLAS

Cited by 40 publications

References 13 publications

ForwArd Search ExpeRiment at the LHC

ForwArd Search ExpeRiment at the LHC

Recent minimum-bias measurements by ATLAS

AFP: first experience with data and future plans

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