APS : Probing light gauge bosons in tau neutrino experiments

Kling, Felix

doi:10.1103/PhysRevD.102.015007

Article
Report number	arXiv:2005.03594
Title	Probing light gauge bosons in tau neutrino experiments
Related title	Probing Light Gauge Bosons in Tau Neutrino Experiments
Author(s)	Kling, Felix (SLAC)
Publication	2020-07-13
Imprint	2020-05-07
Number of pages	10
In:	Phys. Rev. D 102 (2020) 015007
DOI	10.1103/PhysRevD.102.015007
Subject category	Particle Physics - Phenomenology ; Particle Physics - Phenomenology
Accelerator/Facility, Experiment	SND@LHC
Abstract	The tau neutrino is probably the least studied particle in the SM, with only a handful of interaction events being identified so far. This can in part be attributed to their small production rate in the SM, which occurs mainly through D_s meson decay. However, this also makes the tau neutrino flux measurement an interesting laboratory for additional new physics production modes. In this study, we investigate the possibility of tau neutrino production in the decay of light vector bosons. We consider four scenarios of anomaly-free U(1) gauge groups corresponding to the B-L, B-L_mu-2L_tau, B-L_e-2L_tau and B-3L_tau numbers, analyze current constraints on their parameter spaces and explore the sensitivity of DONuT and as well as the future emulsion detector experiments FASERnu, SND@LHC an SND@SHiP. We find that these experiments provide the leading direct constraints in parts of the parameter space, especially when the vector boson's mass is close to the mass of the omega meson.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © 2020-2025 authors (License: CC-BY-4.0)

$Kinematic distributions of tau neutrinos produced in the decay of a $U(1)_{B\!-\!3L_\tau}$ vector boson with mass $m_V=10~\mev$ and coupling $g=10^{-3}$ at the considered experiments. The left panel shows the possible rate of neutrino interactions per unit volume, normalized to its value at the beam axis, as a function of the displacement from the beam axis. For comparison, we also show the radial distribution for tau neutrinos from $D_s$ decay. The gray arrows indicate the radial coverage of the considered experiments. The right panel shows the normalized energy distribution for $\nu_\tau$'s from $V$ decay interacting in the detector.$ $Kinematic distributions of tau neutrinos produced in the decay of a $U(1)_{B\!-\!3L_\tau}$ vector boson with mass $m_V=10~\mev$ and coupling $g=10^{-3}$ at the considered experiments. The left panel shows the possible rate of neutrino interactions per unit volume, normalized to its value at the beam axis, as a function of the displacement from the beam axis. For comparison, we also show the radial distribution for tau neutrinos from $D_s$ decay. The gray arrows indicate the radial coverage of the considered experiments. The right panel shows the normalized energy distribution for $\nu_\tau$'s from $V$ decay interacting in the detector.$ $Regions of parameter space in the $B\!-\!L$ (upper left), $B\!-\!L_e\!-\!2L_\tau$ (upper right), $B\!-\!L_\mu\!-\!2L_\tau$ (bottom left) and $B\!-\!3L_\tau$ (bottom right) scenarios that can be constrained by the measurement of the tau neutrino rate at DONuT (yellow shaded area with solid black line), FASER$\nu$ (solid dark red line), SND@LHC (dashed light red line) and SND@SHiP (dot-dashed blue line) assuming a $33\%$ systematic uncertainty on the tau neutrino flux in the SM. In addition, we also show the possible sensitivity of SND@SHiP if a $6\%$ systematic uncertainty can be achieved (dashed blue line) and if additional cuts on the vertex location are applied (dotted blue line). Existing constraints from direct searches are shown in dark gray, while indirect constraints from scattering experiments and precision measurements are shown in lighter gray. The region accommodating the $(g-2)_\mu$ anomaly is shown as a green band.$ Show more plots

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Record created 2022-07-15, last modified 2022-07-22

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