Browsing by Author "Tabrizi, Zahra"

Now showing 1 - 5 of 5
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    Axionlike Particles at Future Neutrino Experiments: Closing the Cosmological Triangle
    Brdar, Vedran; Dutta, Bhaskar; Jang, Wooyoung; Kim, Doojin; Shoemaker, Ian M.; Tabrizi, Zahra; Thompson, Adrian; Yu, Jaehoon (2021-05-17)
    Axionlike particles (ALPs) provide a promising direction in the search for new physics, while a wide range of models incorporate ALPs. We point out that future neutrino experiments, such as DUNE, possess competitive sensitivity to ALP signals. The high-intensity proton beam impinging on a target can not only produce copious amounts of neutrinos, but also cascade photons that are created from charged particle showers stopping in the target. Therefore, ALPs interacting with photons can be produced (often energetically) with high intensity via the Primakoff effect and then leave their signatures at the near detector through the inverse Primakoff scattering or decays to a photon pair. Moreover, the high-capability near detectors allow for discrimination between ALP signals and potential backgrounds, improving the signal sensitivity further. We demonstrate that a DUNE-like detector can explore a wide range of parameter space in ALP-photon coupling g(a gamma) vs ALP mass m(a), including some regions unconstrained by existing bounds; the "cosmological triangle" will be fully explored and the sensitivity limits would reach up to m(a) similar to 3-4 GeV and down to g(a gamma) similar to 10(-8) GeV-1.
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    EFT at FASERν
    Falkowski, Adam; Gonzalez-Alonso, Martin; Kopp, Joachim; Soreq, Yotam; Tabrizi, Zahra (2021-10-12)
    We investigate the sensitivity of the FASER nu detector to new physics in the form of non-standard neutrino interactions. FASER nu, which will be installed 480 m downstream of the ATLAS interaction point, will for the first time study interactions of multi-TeV neutrinos from a controlled source. Our formalism - which is applicable to any current and future neutrino experiment - is based on the Standard Model Effective Theory (SMEFT) and its counterpart, Weak Effective Field Theory (WEFT), below the electroweak scale. Starting from the WEFT Lagrangian, we compute the coefficients that modify neutrino production in meson decays and detection via deep-inelastic scattering, and we express the new physics effects in terms of modified flavor transition probabilities. For some coupling structures, we find that FASER nu will be able to constrain interactions that are two to three orders of magnitude weaker than Standard Model weak interactions, implying that the experiment will be indirectly probing new physics at the multi-TeV scale. In some cases, FASER nu constraints will become comparable to existing limits - some of them derived for the first time in this paper - already with 150 fb(-1) of data.
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    Gamma ray signals from cosmic ray scattering on axionlike particles
    Dent, James B.; Dutta, Bhaskar; Newstead, Jayden L.; Rodriguez, Alejandro; Shoemaker, Ian M.; Tabrizi, Zahra; Arellano, Natalia Tapia (2021-09-28)
    Dark matter (DM) may be comprised of axionlike particles (ALPs) with couplings to photons and the standard model fermions. In this paper, we study photon signals arising from cosmic ray (CR) electron scattering on background ALPs. For a range of masses we find that these bounds can place competitive new constraints on the ALP-electron coupling, although in many models lifetime constraints may supersede these bounds. In addition to current Fermi constraints, we also consider future e-Astrogram bounds which will have greater sensitivity to ALP-CR induced gamma-rays.
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    Probing new physics at DUNE operating in a beam-dump mode
    Brdar, Vedran; Dutta, Bhaskar; Jang, Wooyoung; Kim, Doojin; Shoemaker, Ian M.; Tabrizi, Zahra; Thompson, Adrian; Yu, Jaehoon (American Physical Society, 2023-03)
    In this work we demonstrate that a future accelerator-based neutrino experiment such as DUNE can greatly increase its sensitivity to a variety of new physics scenarios by operating in a mode where the proton beam impinges on a beam dump. We consider two new physics scenarios, namely light dark matter and axionlike particles and show that by utilizing a dump mode at a DUNE-like experiment, unexplored new regions of parameter space can be probed with an exposure of only 3 months with half of its expected initial beam power. Specifically, targetless configuration of future high intensity neutrino experiments will probe the parameter space for thermal relic dark matter as well as the QCD axion. The strength of such a configuration in the context of new physics searches stems from the fact that the neutrino flux is significantly reduced compared to that of the target, resulting in much smaller backgrounds from neutrino interactions. We have verified this in detail by explicitly computing neutrino fluxes which we make publicly available in order to facilitate further studies with a targetless configuration.
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    Using DUNE to shed light on the electromagnetic properties of neutrinos
    Mathur, Varun; Shoemaker, Ian M.; Tabrizi, Zahra (2022-10-06)
    We study future DUNE sensitivity to various electromagnetic couplings of neutrinos, including magnetic moments, milli-charges, and charge radii. The DUNE PRISM capabilities play a crucial role in constraining the electron flavored couplings. We find that DUNE will be able to place the strongest beam based constraint on the muon-neutrino magnetic moment by improving on LSND’s bounds by roughly a factor of two, although Borexino’s constraint from solar neutrinos will be stronger. For the muon neutrino millicharge DUNE can place the leading beam based bound, with two orders of magnitude improvement compared to the existing COHERENT constraint, suggesting that DUNE can be useful for light mediators more generally. Despite this strength, the millicharge bounds are not competitive with strong bounds from stellar cooling, beta-decay, and matter stability. Finally, DUNE may be able to test the SM prediction for the muon neutrino charge radius, by placing a constraint two times better than CHARM-II and CCFR experiments.