2016/07/31 by Ranjan Laha, Stanley J. Brodsky · 1 citation
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Charm (quantum number) #Charm quark #Dark Matter and Cosmic Phenomena #Gluon #Hadron #Neutrino #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Phenomenology (philosophy) #Physics #Quantum chromodynamics #Quark #astro-ph.HE #hep-ex #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevd.96.123002
published as Phys. Rev. D 96, 123002 (2017) · v3: 13 pages, 4 figures. Added more details about the calculation. Conclusions unchanged. Accepted in PRD
openalex publication_date 2017/12/05 · arxiv created 2017/12/07 · arxiv updated 2017/12/08 · openalex created_date 2017/12/22 · openalex updated_date 2026/08/05
The discovery of extraterrestrial neutrinos in the \ensuremath∼30 TeV--PeV energy range by IceCube provides new constraints on high energy astrophysics. An important background to the signal are the prompt neutrinos which originate from the decay of charm hadrons produced by high energy cosmic-ray particles interacting in the Earth's atmosphere. It is conventional to use the calculations of charm hadroproduction using gluon splitting g\ensuremath→cc alone. However, QCD predicts an additional ``intrinsic" component of the heavy quark distribution which arises from diagrams where heavy quarks are multiply connected to the proton's valence quarks. We estimate the prompt neutrino spectrum due to intrinsic charm. We find that the atmospheric prompt neutrino flux from intrinsic charm is comparable to those calculated using QCD computations not including intrinsic charm, once we normalize the intrinsic charm differential cross sections to the ISR and the LEBC-MPS collaboration data. In the future, IceCube will constrain the intrinsic charm content of the proton and will contribute to one of the major questions in high energy physics phenomenology.