Light dark matter searches with positrons

Battaglieri, M.; Bianconi, A.; Bisio, P.; Bondí, M.; Celentano, A.; Costantini, G.; Cole, P. L.; Vita, R. De; d’Angelo, A.; Napoli, M. De; Fassi, L. El; Kozhuharov, V.; Italiano, A.; Krnjaic, Gordan; Lanza, L.; Leali, M.; Marsicano, L.; Mascagna, V.; Migliorati, S.; Nardi, Enrico; Raggi, M.; Randazzo, N.; Santopinto, E.; Smith, E. S.; Spreafico, M.; Stepanyan, S.; Ungaro, M.; Valente, P.; Venturelli, L.; Wood, M. H.

doi:10.1140/epja/s10050-021-00524-6

Cited by 12 publications

(5 citation statements)

References 47 publications

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“…-Use the energy loss and secondary e + e − production from electromagnetic showers in the target to "scan" various positron energies [175][176][177][178][179]. This requires a target with thickness of the order of one radiation length.…”

Section: Resonant X 17 Productionmentioning

confidence: 99%

Shedding light on X17: community report

et al. 2023

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The workshop “Shedding light on X17” brings together scientists looking for the existence of a possible new light particle, often referred to as X17. This hypothetical particle can explain the resonant structure observed at $$\sim $$ ∼ 17 MeV in the invariant mass of electron-positron pairs, produced after excitation of nuclei such as $$^8\hbox {Be}$$ 8 Be and $$^4\hbox {He}$$ 4 He by means of proton beams at the Atomki Laboratory in Debrecen. The purpose of the workshop is to discuss implications of this anomaly, in particular theoretical interpretations as well as present and future experiments aiming at confirming the result and/or at providing experimental evidence for its interpretation.

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Section: Resonant X 17 Productionmentioning

confidence: 99%

Shedding light on X17: community report

et al. 2023

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“…(a) Pair-annihilation processes are caused by a positron in the beam or in an electromagnetic shower. They typically have a larger cross section than the other processes and give a characteristic shape to the parameter space of the new physics that can be explored [9][10][11][12][13][14][15][16]. The sensitivity to the new physics depends on whether electron beam dump or positron beam dump is used.…”

Section: Jhep09(2021)183mentioning

confidence: 99%

“…(a) Pair-annihilation. Similar to the case of the dark photon and ALP production, with the minimum allowed positron energy E e + ,min16 MeV × (l dump + l sh + l dec )/r det , the minimum allowed mass is determined as m S,min 2m e E e + ,min . Focusing on the small coupling regions, the number of events in both the positron and electron beam JHEP09(2021)183 dump experiment for m S ≤ 2m µ is approximately calculated as 2m µ ≤ m S , the decay mode into a muon pair opens, and the possibility of decaying particles passing through the shield increases.…”

mentioning

confidence: 99%

New physics searches at the ILC positron and electron beam dumps

Asai

Iwamoto

Sakaki

et al. 2021

J. High Energ. Phys.

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We study capability of the ILC beam dump experiment to search for new physics, comparing the performance of the electron and positron beam dumps. The dark photon, axion-like particles, and light scalar bosons are considered as new physics scenarios, where all the important production mechanisms are included: electron-positron pair-annihilation, Primakoff process, and bremsstrahlung productions.We find that the ILC beam dump experiment has higher sensitivity than past beam dump experiments, with the positron beam dump having slightly better performance for new physics particles which are produced by the electron-positron pair-annihilation.

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“…In the former case, we remind the reader that the associated poles in these channels will push both the V and γ into the forward/backward scattering directions so that detector angular acceptance cuts will reduce the signal rate. To see this, taking z = cos θ, the angle of the outgoing photon with respect to the incoming e − , we recall that in the standard KM/vector coupling case the cross section for this process in the center of mass frame is given by [103]…”

Section: Jhep11(2021)035mentioning

confidence: 99%

Dark moments for the Standard Model?

Rizzo

2021

J. High Energ. Phys.

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If dark matter (DM) interacts with the Standard Model (SM) via the kinetic mixing (KM) portal, it necessitates the existence of portal matter (PM) particles which carry both dark and SM quantum numbers that will appear in vacuum polarization-like loop graphs. In addition to the familiar ∼ eϵQ strength, QED-like interaction for the dark photon (DP), in some setups different loop graphs of these PM states can also induce other coupling structures for the SM fermions that may come to dominate in at least some regions of parameter space regions and which can take the form of ‘dark’ moments, e.g., magnetic dipole-type interactions in the IR, associated with a large mass scale, Λ. In this paper, motivated by a simple toy model, we perform a phenomenological investigation of a possible loop-induced dark magnetic dipole moment for SM fermions, in particular, for the electron. We show that at the phenomenological level such a scenario can not only be made compatible with existing experimental constraints for a significant range of correlated values for Λ and the dark U(1)D gauge coupling, gD, but can also lead to quantitatively different signatures once the DP is discovered. In this setup, assuming complex scalar DM to satisfy CMB constraints, parameter space regions where the DP decays invisibly are found to be somewhat preferred if PM mass limits from direct searches at the LHC and our toy model setup are all taken seriously. High precision searches for, or measurements of, the e+e− → γ + DP process at Belle II are shown to provide some of the strongest future constraints on this scenario.

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Light dark matter searches with positrons

Cited by 12 publications

References 47 publications

Shedding light on X17: community report

Shedding light on X17: community report

New physics searches at the ILC positron and electron beam dumps

Dark moments for the Standard Model?

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