Tau neutrino fluxes from atmospheric charm

Pasquali, L.; Reno, Mary Hall

doi:10.1103/physrevd.59.093003

Cited by 64 publications

(38 citation statements)

References 28 publications

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“…One can make an approximate model of the energy distribution of neutrinos from tau decays for the two-and three-body decays τ → ν τ ν , τ → πν τ , τ → ρν τ and τ → a 1 ν τ , accounting for ∼ 85% of the tau decay width [101,102]. The energy distribution of the tau neutrino can be evaluated directly where the form of the distribution is [103]:…”

Section: Tau Decays and Regenerationmentioning

confidence: 99%

Cosmic tau neutrino detection via Cherenkov signals from air showers from Earth-emerging taus

2019

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We perform a new, detailed calculation of the flux and energy spectrum of Earth-emerging τleptons generated from the interactions of tau neutrinos and antineutrinos in the Earth. A layered model of the Earth is used to describe the variable density profile of the Earth. Different assumptions regarding the neutrino charged-and neutral-current cross sections as well as the τ -lepton energy loss models are used to quantify their contributions to the systematic uncertainty. A baseline simulation is then used to generate the optical Cherenkov signal from upward-moving extensive air showers generated by the τ -lepton decay in the atmosphere, applicable to a range of space-based instruments. We use this simulation to determine the neutrino sensitivity for Eν ∼ > 10 PeV for a space-based experiment with performance similar to that for the Probe of Extreme MultiMessenger Astrophysics (POEMMA) mission currently under study.

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Section: Tau Decays and Regenerationmentioning

confidence: 99%

Cosmic tau neutrino detection via Cherenkov signals from air showers from Earth-emerging taus

2019

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“…A background to neutrinos from astrophysical sources are neutrinos produced in high energy cosmic ray interactions with nuclei in the Earth's atmosphere. While pion and kaon production and decay dominate the low energy "conventional" neutrino flux [3][4][5], short-lived charmed hadron decays to neutrinos dominate the "prompt" neutrino flux [6][7][8][9][10][11][12][13][14] at high energies. The precise cross-over energy where the prompt flux dominates the conventional flux depends on the zenith angle and is somewhat obscured by the large uncertainties in the prompt flux.…”

mentioning

confidence: 99%

“…The standard approach is to use NLO perturbative QCD (pQCD) in the collinear approximation with the integrated parton distribution functions (PDFs) and to evaluate the heavy quark pair production which is dominated by the elementary gluon fusion process [17][18][19]. Such calculations were performed in [7][8][9] (see also [6]). Recent work to update these predictions using modern PDFs and models of the incident cosmic ray energy spectrum and composition appears in [11], and including accelerator physics Monte Carlo interfaces, in [12][13][14].…”

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confidence: 99%

Prompt atmospheric neutrino fluxes: perturbative QCD models and nuclear effects

Bhattacharya

Enberg

Jeong

et al. 2016

J. High Energ. Phys.

105

102

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We evaluate the prompt atmospheric neutrino flux at high energies using three different frameworks for calculating the heavy quark production cross section in QCD: NLO perturbative QCD, k T factorization including low-x resummation, and the dipole model including parton saturation. We use QCD parameters, the value for the charm quark mass and the range for the factorization and renormalization scales that provide the best description of the total charm cross section measured at fixed target experiments, at RHIC and at LHC. Using these parameters we calculate differential cross sections for charm and bottom production and compare with the latest data on forward charm meson production from LHCb at 7 TeV and at 13 TeV, finding good agreement with the data. In addition, we Open Access, c The Authors. Article funded by SCOAP 3 .doi:10.1007/JHEP11 (2016)167 JHEP11 (2016)167 investigate the role of nuclear shadowing by including nuclear parton distribution functions (PDF) for the target air nucleus using two different nuclear PDF schemes. Depending on the scheme used, we find the reduction of the flux due to nuclear effects varies from 10% to 50% at the highest energies. Finally, we compare our results with the IceCube limit on the prompt neutrino flux, which is already providing valuable information about some of the QCD models.

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“…The latter distribution, after integrating over angles relative to the tau momentum direction, is discussed in refs. [47,48] in the context of the atmospheric tau neutrino flux. Here, we need the full energy and angular distribution in the collider frame to apply the requirement that the neutrino pseudorapidity fulfills the η > 6.87 constraint.…”

Section: Tau Neutrinosmentioning

confidence: 99%

Far-forward neutrinos at the Large Hadron Collider

Bai

Diwan

Garzelli

et al. 2020

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We present a new calculation of the energy distribution of high-energy neutrinos from the decay of charm and bottom hadrons produced at the Large Hadron Collider (LHC). In the kinematical region of very forward rapidities, heavy-flavor production and decay is a source of tau neutrinos that leads to thousands of charged-current tau neutrino events in a 1 m long, 1 m radius lead neutrino detector at a distance of 480 m from the interaction region. In our computation, next-to-leading order QCD radiative corrections are accounted for in the production cross-sections. Non-perturbative intrinsic-k T effects are approximated by a simple phenomenological model introducing a Gaussian k T -smearing of the parton distribution functions, which might also mimic perturbative effects due to multiple initial-state soft-gluon emissions. The transition from partonic to hadronic states is described by phenomenological fragmentation functions. To study the effect of various input parameters, theoretical predictions for D ± s production are compared with LHCb data on double-differential cross-sections in transverse momentum and rapidity. The uncertainties related to the choice of the input parameter values, ultimately affecting the predictions of the tau neutrino event distributions, are discussed. We consider a 3+1 neutrino mixing scenario to illustrate the potential for a neutrino experiment to constrain the 3+1 parameter space using tau neutrinos and antineutrinos. We find large theoretical uncertainties in the predictions of the neutrino fluxes in the far-forward region. Untangling the effects of tau neutrino oscillations into sterile neutrinos and distinguishing a 3+1 scenario from the standard scenario with three active neutrino flavours, will be challenging due to the large theoretical uncertainties from QCD.

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Tau neutrino fluxes from atmospheric charm

Cited by 64 publications

References 28 publications

Cosmic tau neutrino detection via Cherenkov signals from air showers from Earth-emerging taus

Cosmic tau neutrino detection via Cherenkov signals from air showers from Earth-emerging taus

Prompt atmospheric neutrino fluxes: perturbative QCD models and nuclear effects

Far-forward neutrinos at the Large Hadron Collider

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