New physics searches at the ILC positron and electron beam dumps

Asai, Kento; Iwamoto, Sho; Sakaki, Yasuhito; Ueda, Daiki

doi:10.1007/jhep09(2021)183

Cited by 19 publications

(24 citation statements)

References 38 publications

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“…The method of evaluating the number of signals is summarised in detail in Ref. [28,29]. The number of signals is given by…”

Section: Background and Signal Estimations 41 Setup-1mentioning

confidence: 99%

Search for axion-like particles with electron and positron beams at KEK Linac

Ishikawa¹,

Sakaki²,

Takubo³

2021

Preprint

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We propose a fixed-target experiment to search for Axion-like particles (ALPs) coupling to photons, which utilizes electron and positron beams available at KEK Linac. The sensitivity to ALP is evaluated for two shielding setups in conjunction with other beam dump experiments, fixed-target experiments, and e + e − collider experiments. This study shows that the two setups can explore the gap between the search region excluded by the beam dump experiments and the e + e − collider experiments.

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“…The method of evaluating the number of signals is summarised in detail in Ref. [28,29]. The number of signals is given by…”

Section: Background and Signal Estimations 41 Setup-1mentioning

confidence: 99%

Search for axion-like particles with electron and positron beams at KEK Linac

Ishikawa¹,

Sakaki²,

Takubo³

2021

Preprint

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“…We note in passing that experiments using the beam dumps of a high-energy e + e − collider such as the ILC have impressive sensitivity to lighter dark photons[27,28].…”

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confidence: 94%

Dark Z at the International Linear Collider

San,

Perelstein,

Tanedo

2022

Preprint

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A dark Z is a massive Abelian gauge boson which is coupled to the Standard Model through both kinetic and mass mixing with the electroweak sector. We study the phenomenology of the dark Z at an energy-frontier e + e − collider, such as the proposed International Linear Collider (ILC). We show that precision electroweak constraints and the current bounds from the hardon colliders allow a dark Z that is kinematically accessible at the ILC with 250 GeV or 500 GeV center-of-mass energy. Further, the reach of the ILC searches for a dark Z significantly exceeds the expected reach of the high luminosity LHC. If a signal consistent with a dark Z is discovered, it would motivate a dedicated run of the ILC at the center-of-mass energy matching the dark Z mass. We demonstrate that a short one month run at design luminosity could measure the dark Z chiral couplings to fermions with percent precision. This measurement can be used to discriminate between competing theoretical models of the resonance: for example, the dark Z can be distinguished from a dark photon with purely kinetic mixing.

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“…The physics potential of far detectors has been explored at the FCC-ee or CEPC [16,17] and at future lepton colliders running at the Z pole [18]. Alternatively, light LLPs produced from the electron or positron beams could be observed in beam dump experiments, as proposed for the ILC [19].…”

Section: Introductionmentioning

confidence: 99%

Near or Far Detectors? Optimizing Long-Lived Particle Searches at Electron-Positron Colliders

Schäfer¹,

Tillinger²,

Westhoff³

2022

Preprint

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We explore the discovery potential for long-lived particles at the 250-GeV ILC. The goal is to investigate possible gains of a dedicated far detector over the main detector ILD. For concreteness, we perform our study for sub-GeV axion-like particles a produced via e + e − → aγ or e + e − → Zγ → (aγ)γ and decaying into pairs of charged leptons. In the ideal case of zero background and perfect detection efficiency, we find that far detectors placed in the planned underground cavities or a large cuboid on the ground can enhance the sensitivity to long-lived pseudo-scalars at best moderately. On the other hand, the ILD itself is a perfect environment to search for long-lived particles, due to its excellent angular coverage and radial thickness. For long-lived particles produced with cross sections of a few picobarns, the ILD could probe lifetimes up to 300 ns, or proper decay lengths up to 100 m, in 250 fb −1 of data. For axion-like particles produced through weak interactions, the ILC can reach an even higher sensitivity than searches for displaced vertices in meson decays at Belle II. Our findings apply similarly to other proposed electron-positron experiments with a high angular coverage, such as the FCC-ee and CEPC.

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New physics searches at the ILC positron and electron beam dumps

Cited by 19 publications

References 38 publications

Search for axion-like particles with electron and positron beams at KEK Linac

Search for axion-like particles with electron and positron beams at KEK Linac

Dark Z at the International Linear Collider

Near or Far Detectors? Optimizing Long-Lived Particle Searches at Electron-Positron Colliders

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