The prompt atmospheric neutrino flux in the light of LHCb

Rhorry Gauld, Juan Rojo, Luca Rottoli, Subir Sarkar, Jim Talbert

Research output: Contribution to JournalArticleAcademicpeer-review


The recent observation of very high energy cosmic neutrinos by IceCube heralds the beginning of neutrino astronomy. At these energies, the dominant background to the astrophysical signal is the flux of `prompt' neutrinos, arising from the decay of charmed mesons produced by cosmic ray collisions in the atmosphere. In this work we provide predictions for the prompt atmospheric neutrino flux in the framework of perturbative QCD, using state-of-the-art Monte Carlo event generators. Our calculation includes the constraints set by charm production measurements from the LHCb experiment at 7 TeV, and has been recently validated with the corresponding 13 TeV data. Our results for the prompt flux are a factor of about 2 below the previous benchmark calculation, in general agreement with two other recent estimates, and with an improved estimate of the uncertainty. This alleviates the existing tension between the theoretical prediction and IceCube limits, and suggests that a direct direction of the prompt flux is imminent.
Original languageEnglish
Article number130
Number of pages20
JournalJournal of High Energy Physics
Issue number2
Publication statusPublished - 19 Feb 2016

Bibliographical note

20 pages, 10 figures; corrected conventional flux in Fig. 6, to appear in JHEP. The PrompNuFlux code is available from


  • hep-ph
  • astro-ph.HE
  • hep-ex


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