Improved Limits on Cosmogenic Fluxes from Ultra-High Energy Cosmic Rays

Groth, Kathrine Mørch; Génolini, Yoann; Ahlers, M.

doi:10.22323/1.395.1005

Cited by 5 publications

(4 citation statements)

References 39 publications

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“…Neutrinos will be severely attenuated while propagating in matter at EeV energies, around which we expect a bump of the cosmogenic neutrino flux [114][115][116][117][118][119][120][121]. To set the scale, the charged-current (CC) cross section of neutrinos in matter is roughly σ CC ≈ 10 −32 cm 2 • (E ν /EeV) 0.363 [122][123][124], corresponding to a mean free path of L CC ν ≈ 560 km•(E ν /EeV) −0.363 in standard rock with a density of 2.65 g • cm −3 .…”

Section: Neutrino and Tau Propagationmentioning

confidence: 99%

Probing new physics at future tau neutrino telescopes

Huang

Jana

Lindner

et al. 2022

J. Cosmol. Astropart. Phys.

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We systematically investigate new physics scenarios that can modify the interactions between neutrinos and matter at upcoming tau neutrino telescopes, which will test neutrino-proton collisions with energies ≳ 45 TeV, and can provide unique insights to the elusive tau neutrino. At such high energy scales, the impact of parton distribution functions of second and third generations of quarks (usually suppressed) can be comparable to the contribution of first generation with small momentum fraction, hence making tau neutrino telescopes an excellent facility to probe new physics associated with second and third families. Among an inclusive set of particle physics models, we identify new physics scenarios at tree level that can give competitive contributions to the neutrino cross sections while staying within laboratory constraints: charged/neutral Higgs and leptoquarks. Our analysis is close to the actual experimental configurations of the telescopes, and we perform a χ2-analysis on the energy and angular distributions of the tau events. By numerically solving the propagation equations of neutrino and tau fluxes in matter, we obtain the sensitivities of representative upcoming tau neutrino telescopes, GRAND, POEMMA and Trinity, to the charged Higgs and leptoquark models. While each of the experiments can achieve a sensitivity better than the current collider reaches for certain models, their combination is remarkably complementary in probing the new physics. In particular, the new physics will affect the energy and angular distributions in different ways at those telescopes.

show abstract

Section: Neutrino and Tau Propagationmentioning

confidence: 99%

Probing new physics at future tau neutrino telescopes

Huang

Jana

Lindner

et al. 2022

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…Neutrinos will be severely attenuated while propagating in matter at EeV energies, around which we expect a bump of the cosmogenic neutrino flux [113][114][115][116][117][118][119][120]. To set the scale, the charged-current (CC) cross section of neutrinos in matter is roughly σ CC ≈ 10 −32 cm 2 • (E ν /EeV) 0.363 [121][122][123], corresponding to a mean free path of L CC ν ≈ 560 km • (E ν /EeV) −0.363 in standard rock with a density of 2.65 g • cm −3 .…”

Section: Neutrino and Tau Propagationmentioning

confidence: 99%

Probing New Physics at Future Tau Neutrino Telescopes

Huang,

Jana,

Lindner

et al. 2021

Preprint

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We systematically investigate new physics scenarios that can modify the interactions between neutrinos and matter at upcoming tau neutrino telescopes, which will test neutrinoproton collisions with energies 45 TeV, and can provide unique insights to the elusive tau neutrino. At such high energy scales, the impact of parton distribution functions of second and third generations of quarks (usually suppressed) can be comparable to the contribution of first generation with small momentum fraction, hence making tau neutrino telescopes an excellent facility to probe new physics associated with second and third families. Among an inclusive set of particle physics models, we identify new physics scenarios at tree level that can give competitive contributions to the neutrino cross sections while staying within laboratory constraints: charged/neutral Higgs and leptoquarks. Our analysis is close to the actual experimental configurations of the telescopes, and we perform a χ 2 -analysis on the energy and angular distributions of the tau events. By numerically solving the propagation equations of neutrino and tau fluxes in matter, we obtain the sensitivities of representative upcoming tau neutrino telescopes, GRAND, POEMMA and Trinity, to the charged Higgs and leptoquark models. While each of the experiments can achieve a sensitivity better than the current collider reaches for certain models, their combination is remarkably complementary in probing the new physics. In particular, the new physics will affect the energy and angular distributions in different ways at those telescopes.

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“…However, the attenuation of GZK photons by the ERB is not very well-estimated, primarily because models JCAP01(2024)058 describing the ERB spectrum have large uncertainties [33,34]. These model uncertainties can cascade to the GZK photon flux prediction and can give rise to the substantial uncertainties [35][36][37]. Apart from these uncertainties, the ARCADE2 experiment [38] has detected an excess ERB at GHz frequencies and can influence the prediction of the GZK photon flux.…”

Section: Introductionmentioning

confidence: 99%

A relook at the GZK neutrino-photon connection: impact of extra-galactic radio background & UHECR properties

Chakraborty,

Mehta,

Sarmah

2024

J. Cosmol. Astropart. Phys.

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Ultra-high energy cosmic rays (UHECRs) beyond the Greisen-Zatsepin-Kuzmin (GZK) cut-off provide us with a unique opportunity to understand the universe at extreme energies. Secondary GZK photons and GZK neutrinos associated with the same interaction are indeed interconnected and render access to multi-messenger analysis of UHECRs. The GZK photon flux is heavily attenuated due to the interaction with Cosmic Microwave Background (CMB) and the Extra-galactic Radio Background (ERB). The present estimate of the ERB comprising of several model uncertainties together with the ARCADE2 radio results in large propagation uncertainties in the GZK photon flux. On the other hand, the weakly interacting GZK neutrino flux is unaffected by these propagation effects. In this work, we make an updated estimate of the GZK photon and GZK neutrino fluxes considering a wide variation of both the production and propagation properties of the UHECR like, the spectral index, the cut-off energy of the primary spectrum, the distribution of sources and the uncertainties in the ERB estimation. We explore the detection prospects of the GZK fluxes with various present and upcoming UHECR and UHE neutrino detectors such as Auger, TA, GRAND, ANITA, ARA, IceCube and IceCube-Gen2. The predicted fluxes are found to be beyond the reach of the current detectors. In future, proposed IceCube-Gen2, Auger upgrade and GRAND experiments will have the sensitivity to the predicted GZK photon and GZK neutrino fluxes. Such detection can put constraints on the UHECR source properties and the propagation effects due to the ERB. We also propose an indirect limit on the GZK photon flux using the neutrino-photon connection for any future detection of GZK neutrinos by the IceCube-Gen2 detector. We find this limit to be consistent with our GZK flux predictions.

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Improved Limits on Cosmogenic Fluxes from Ultra-High Energy Cosmic Rays

Cited by 5 publications

References 39 publications

Probing new physics at future tau neutrino telescopes

Probing new physics at future tau neutrino telescopes

Probing New Physics at Future Tau Neutrino Telescopes

A relook at the GZK neutrino-photon connection: impact of extra-galactic radio background & UHECR properties

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