Dark matter, millicharges, axion and scalar particles, gauge bosons, and other new physics with LDMX

Berlin, Asher; Blinov, Nikita; Krnjaic, Gordan; Schuster, Philip; Toro, Natalia

doi:10.1103/physrevd.99.075001

Cited by 208 publications

(257 citation statements)

References 155 publications

(349 reference statements)

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“…This parameter space is also constrained rare kaon decays, but the bound is weaker than the CCFR region above [52]. Intriguingly, the full parameter space that simultaneously ameliorates both the H0 and (g − 2)µ anomalies can also be tested with fixed target experiments [53][54][55][56], rare kaon decays [52,57], and at Belle-II [58,59].…”

Section: )mentioning

confidence: 99%

Cosmology with a very light Lμ − Lτ gauge boson

Escudero

Hooper

Krnjaic

et al. 2019

J. High Energ. Phys.

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231

272

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In this paper, we explore in detail the cosmological implications of an abelian L µ − L τ gauge extension of the Standard Model featuring a light and weakly coupled Z . Such a scenario is motivated by the longstanding ∼ 4σ discrepancy between the measured and predicted values of the muon's anomalous magnetic moment, (g − 2) µ , as well as the tension between late and early time determinations of the Hubble constant. If sufficiently light, the Z population will decay to neutrinos, increasing the overall energy density of radiation and altering the expansion history of the early universe. We identify two distinct regions of parameter space in this model in which the Hubble tension can be significantly relaxed. The first of these is the previously identified region in which a ∼ 10 − 20 MeV Z reaches equilibrium in the early universe and then decays, heating the neutrino population and delaying the process of neutrino decoupling. For a coupling of g µ−τ (3 − 8) × 10 −4 , such a particle can also explain the observed (g − 2) µ anomaly. In the second region, the Z is very light (m Z ∼ 1 eV to MeV) and very weakly coupled (g µ−τ ∼ 10 −13 to 10 −9 ). In this case, the Z population is produced through freeze-in, and decays to neutrinos after neutrino decoupling. Across large regions of parameter space, we predict a contribution to the energy density of radiation that can appreciably relax the reported Hubble tension, ∆N eff 0.2.

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Section: )mentioning

confidence: 99%

Cosmology with a very light Lμ − Lτ gauge boson

Escudero

Hooper

Krnjaic

et al. 2019

J. High Energ. Phys.

Self Cite

231

272

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“…Several proposed electron-fixed target experiments (e.g. LDMX [41] and NA64 [42]) can further improve the sensitivity of MCP, but the mass reach would be limited by the beam energy. Finally, using neutrino experiments and protons-on-fixed-targets to study MCP has been long proposed [8][9][10], but a dedicated analysis considering all the current and proposed near-future experiments has only been done recently [16], followed by the study based on reactor neutrino experiment for the lower mass MCP [43].…”

Section: • Collider Probes • Electron Fixed-target Experiments • Protmentioning

confidence: 99%

Proton fixed-target scintillation experiment to search for millicharged dark matter

Kelly

Tsai

2019

Phys. Rev. D

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We propose a low-cost and movable setup to probe minicharged particles (or milli-charged particles) using high-intensity proton fixed-target facilities. This proposal, FerMINI, consists of a milliQan-type detector, requiring multi-coincident (nominally, triple-coincident) scintillation signatures within a small time window, located downstream of the proton target of a neutrino experiment. During the collisions of a large number of protons on the target, intense minicharged particle beams may be produced via meson photo-decays and Drell-Yan production. We take advantage of the high statistics, shielding, and potential neutrino-detector-related background reduction to search for minicharged particles in two potential sites: the MINOS near detector hall and the proposed DUNE near detector hall, both at Fermilab. We also explore several alternative designs, including the modifications of the nominal detector to increase signal yield, and combining this detector technology with existing and planned neutrino detectors to better search for minicharged particles. The CERN SPS beam and associated experimental structure also provide a similar alternative. FerMINI can achieve unprecedented sensitivity for minicharged particles in the MeV to few GeV regime with fractional charge ε = Qχ/e between 10 −4 (potentially saturating the detector limitation) and 10 −1 .

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“…Laboratory-based limits on mCPs have been placed by the milliQ experiment at SLAC [16]. More recently more search strategies have been proposed, both in a dedicated experiment at LHC (milliQan) [17] and other fixed-target setups [18]. During the preparation of this work, Ref.…”

Section: Introductionmentioning

confidence: 99%

Millicharged particles in liquid argon neutrino experiments

Harnik

Liu

Palamara

2019

J. High Energ. Phys.

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We investigate the potential of Liquid Argon (LAr) neutrino detectors to search for millicharged particles, a well-motivated extension of the standard model. Detectors located downstream of an intense proton beam that is striking a target may be exposed to a large flux of millicharged particles. Millicharged particles interact primarily through low momentum exchange producing electron recoil events near detector threshold. Recently, sub-MeV detection capabilities were demonstrated by the Fermilab ArgoNeuT detector, a small LAr detector which was exposed to the NuMI neutrino beam. Despite high background rates and its small size, we show that ArgoNeuT is capable of probing unexplored parameter space with its existing dataset. In particular, we show that the excellent spatial resolution in LAr detectors allows rejecting backgrounds by requiring two soft hits that are aligned with the upstream target. We further discuss the prospects of these types of searches in future larger LAr neutrino detectors such as the DUNE near detector.

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Dark matter, millicharges, axion and scalar particles, gauge bosons, and other new physics with LDMX

Cited by 208 publications

References 155 publications

Cosmology with a very light Lμ − Lτ gauge boson

Cosmology with a very light Lμ − Lτ gauge boson

Proton fixed-target scintillation experiment to search for millicharged dark matter

Millicharged particles in liquid argon neutrino experiments

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