Probing the mixing between sterile and tau neutrinos in the SHiP experiment
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arXiv
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2024
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| author | Choi, Ki-Young Kim, Sung Hyun Kim, Yeong Gyun Lee, Kang Young Lee, Kyong Sei Park, Byung Do Sohn, Jong Yoon Yoo, Seong Moon Yoon, Chun Sil |
| author_facet | Choi, Ki-Young Kim, Sung Hyun Kim, Yeong Gyun Lee, Kang Young Lee, Kyong Sei Park, Byung Do Sohn, Jong Yoon Yoo, Seong Moon Yoon, Chun Sil |
| contents | We study the expected sensitivity to the mixing between sterile and tau neutrinos directly from the tau neutrino disappearance in the high-energy fixed target experiment. Here, the beam energy is large enough to produce tau neutrinos at the target with large luminosity. During their propagation to the detector, tau neutrinos may oscillate into sterile neutrinos. By examining the energy spectrum of the observed tau neutrino events, we can probe the mixing between sterile and tau neutrinos directly. In this paper, we consider Scattering and Neutrino Detector (SND) at SHiP experiment as a showcase, which uses 400 GeV protons from SPS at CERN, and expect to observe 7,300 tau and anti-tau neutrinos from the $2\times 10^{20}$ POT for 5 years operation. Assuming the uncertainty of 10\%, we find the sensitivity $|U_{τ4}|^2 \sim 0.08$\, (90\% CL) for $Δm_{41}^2 \sim 500\ \mathrm{eV}^2$ with 10\% background to the signal. We also consider a far SND at the end of the SHiP Hidden Sector Decay Spectrometer (HSDS), in which case the sensitivity would be enhanced to $|U_{τ4}|^2 \sim 0.02$. Away from this mass, the sensitivity becomes lower than $|U_{τ4}|^2 \sim 0.15$ for $Δm_{41}^2 \lesssim 100\ \mathrm{eV}^2$ or $Δm_{41}^2\gtrsim 10^4 \mathrm{eV}^2$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_04191 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Probing the mixing between sterile and tau neutrinos in the SHiP experiment Choi, Ki-Young Kim, Sung Hyun Kim, Yeong Gyun Lee, Kang Young Lee, Kyong Sei Park, Byung Do Sohn, Jong Yoon Yoo, Seong Moon Yoon, Chun Sil High Energy Physics - Phenomenology High Energy Physics - Experiment We study the expected sensitivity to the mixing between sterile and tau neutrinos directly from the tau neutrino disappearance in the high-energy fixed target experiment. Here, the beam energy is large enough to produce tau neutrinos at the target with large luminosity. During their propagation to the detector, tau neutrinos may oscillate into sterile neutrinos. By examining the energy spectrum of the observed tau neutrino events, we can probe the mixing between sterile and tau neutrinos directly. In this paper, we consider Scattering and Neutrino Detector (SND) at SHiP experiment as a showcase, which uses 400 GeV protons from SPS at CERN, and expect to observe 7,300 tau and anti-tau neutrinos from the $2\times 10^{20}$ POT for 5 years operation. Assuming the uncertainty of 10\%, we find the sensitivity $|U_{τ4}|^2 \sim 0.08$\, (90\% CL) for $Δm_{41}^2 \sim 500\ \mathrm{eV}^2$ with 10\% background to the signal. We also consider a far SND at the end of the SHiP Hidden Sector Decay Spectrometer (HSDS), in which case the sensitivity would be enhanced to $|U_{τ4}|^2 \sim 0.02$. Away from this mass, the sensitivity becomes lower than $|U_{τ4}|^2 \sim 0.15$ for $Δm_{41}^2 \lesssim 100\ \mathrm{eV}^2$ or $Δm_{41}^2\gtrsim 10^4 \mathrm{eV}^2$. |
| title | Probing the mixing between sterile and tau neutrinos in the SHiP experiment |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2403.04191 |