ALPSII Status Report

Spector, Aaron

doi:10.48550/arxiv.1906.09011

Cited by 4 publications

(5 citation statements)

References 8 publications

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“…The resulting parameter space is therefore spanned by the axion mass m a and the axion coupling g aγγ . Axion search experiments utilize a variety of experimental techniques that range from laboratory-based light-shining-through walls (LSW) experiments such as ALPS II [14], helioscopes looking for solar axions such as CAST [15,16] and the future IAXO [17,18], haloscopes looking for dark matter axions [19][20][21][22][23][24] but also colliders [25,26], flavor probes [27][28][29][30], as well as beam dump [31] and neutrino [32,33] experiments for larger masses. There are also a number of astrophysical constraints (typically through energy-loss arguments) and cosmological bounds which provide a nice complementarity with respect to proposed experiments.…”

Section: Introductionmentioning

confidence: 99%

Axion Searches at the LHC: FASER as a Light Shining through Walls Experiment

Kling¹,

Quílez²

2022

Preprint

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We propose the use of FASER as a light-shining-through-walls experiment to search for axions. LHC collisions generate a high intensity and high energy photon flux in the forward direction which can oscillate into axions in the magnetic fields that are used to confine the beam. These axions then pass through about 100 m of rock before reaching the magnetic fields of FASER, where they can convert back into photons and be detected by an electromagnetic calorimeter. In the next years, FASER and its successor FASER2 at the Forward Physics Facility will be able to explore regions of the axion parameter space inaccessible by other laboratory-based experiments.

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Section: Introductionmentioning

confidence: 99%

Axion Searches at the LHC: FASER as a Light Shining through Walls Experiment

Kling¹,

Quílez²

2022

Preprint

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“…A major current focus of searches beyond the Standard Model (SM) is the QCD axion [1][2][3] and more general pseudo-scalar axion-like particles (ALPs) a, which are ubiquitous in string theory [4,5]. These hypothetical particles are being probed by a wide array of methods that exploit the ALP-photon coupling [6][7][8][9][10]. We refer to Ref.…”

Section: Introductionmentioning

confidence: 99%

“…Laboratory-based searches for ALPs coupling to photons fall into several distinct categories depending on the regions of parameter space they are sensitive to. Light-shining-through-wall experiments [10], which rely on ALP-photon conversions, probe smaller ALP masses m a 10 −3 eV; beam dumps that rely on ALP decay typically probe larger masses ∼ O(1 MeV -1 GeV) ; while hybrid proposals like PASSAT probe an intermediate regime m a 100 eV.…”

Section: Introductionmentioning

confidence: 99%

Probing axionlike particles with γγ final states from vector boson fusion processes at the LHC

et al. 2021

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We perform a feasibility study to search for axion-like particles (ALPs) using vector boson fusion (VBF) processes at the LHC. We work in an effective field theory framework with cutoff scale Λ and ALP mass ma, and assume that ALPs couple to photons with strength ∝ 1/Λ. Assuming proton-proton collisions at √ s = 13 TeV, we present the total VBF ALP production cross sections, ALP decay widths and lifetimes, and relevant kinematic distributions as a function of ma and Λ. We consider the a → γγ decay mode to show that the requirement of an energetic diphoton pair combined with two forward jets with large dijet mass and pseudorapidity separation can significantly reduce the Standard Model backgrounds, leading to a 5σ discovery reach for 10 MeV ma 1 TeV with Λ 2 TeV, assuming an integrated luminosity of 3000 fb −1 . In particular, this extends the LHC sensitivity to a previously unstudied region of the ALP parameter space.

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“…ALPs can convert to photons and vice versa in the presence of an external magnetic field, leading to experiments based on the axion haloscope and the axion helioscope [6][7][8]. On the other hand, photon regeneration (light shining through wall, LSW) experiments [9] attempt to actively produce ALPs with a high-intensity laser beam applied in a magnetic field, followed by detecting the produced photons via ALP-photon conversion. We refer to Ref.…”

Section: Introduction and Motivationsmentioning

confidence: 99%

PASSAT: particle accelerator helioScopes for Slim Axion-like-particle deTection

2020

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We propose a novel method to search for axion-like particles (ALPs) at particle accelerator experiments. ALPs produced at the target via the Primakoff effect subsequently enter a region with a magnetic field, where they are converted to photons that are then detected. Dubbed Particle Accelerator helioScopes for Slim Axion-like-particle deTection (PASSAT), our proposal uses the principle of the axion helioscope but replaces ALPs produced in the Sun with those produced in a target material. Since we rely on ALP-photon conversions, our proposal probes light (slim) ALPs that are otherwise inaccessible to laboratory-based experiments which rely on ALP decay, and complements astrophysical probes that are more model-dependent. As a first application, we reinterpret existing data from the NOMAD experiment in light of PASSAT, and constrain the parameter space for ALPs lighter than ∼ 100 eV and ALP-photon coupling larger than ∼ 10 −4 GeV −1 . As benchmarks of feasible low-cost experiments improving over the NOMAD limits, we study the possibility of reusing the magnets of the CAST and the proposed BabyIAXO experiments and placing them at the proposed BDF facility at CERN, together with some new detectors. We find that these realizations of PASSAT allow for a direct probe of the parameter space for ALPs lighter than ∼ 100 eV and ALP-photon coupling larger than ∼ 4 × 10 −6 GeV −1 , which are regions that have not been probed yet by experiments with laboratory-produced ALPs. In contrast to other proposals aiming at detecting single or two-photon only events in hadronic beam dump environments, that rely heavily on Monte Carlo simulations, the background in our proposal can be directly measured in-situ, its suppression optimized, and the irreducible background statistically subtracted. Sensitivity evaluations with other beams will be the subject of a future paper. The measurements suggested in this paper represent an additional physics case for the BDF at CERN beyond those already proposed.

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ALPSII Status Report

Cited by 4 publications

References 8 publications

Axion Searches at the LHC: FASER as a Light Shining through Walls Experiment

Axion Searches at the LHC: FASER as a Light Shining through Walls Experiment

Probing axionlike particles with γγ final states from vector boson fusion processes at the LHC

PASSAT: particle accelerator helioScopes for Slim Axion-like-particle deTection

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