A Bayesian analysis of light-front models and the nucleon's charmed sigma term

Abstract

We present the results of a recent analysis to study the nucleon's charm sigma term, ${\sigma }_{c\overline{c}}$. We construct a minimal model in terms of light-front variables and constrain the range of possibilities using extant knowledge from deeply inelastic scattering (DIS) and Bayesian parameter estimation, ultimately computing ${\sigma }_{c\overline{c}}$ in an explicitly covariant manner. We find a close correlation between a possible nonperturbative component of the charm structure function, $F_{2,\mathrm{IC}}^{c\overline{c}}$, and ${\sigma }_{c\overline{c}}$. Independent of prescription for the covariant relativistic quark-nucleon vertex, we determine ${\sigma }_{c\overline{c}}$ under several different scenarios for the magnitude of intrinsic charm (IC) in DIS, namely $⟨x{⟩}_{c+\overline{c}}=0.1\%$, $0.35\%$, and $1\%$, obtaining for these ${\sigma }_{c\overline{c}}=4\pm 4$, $12\pm 13$, and $32\pm 34$ MeV, respectively. These results imply the existence of a reciprocity between the IC parton distribution function (PDF) and ${\sigma }_{c\overline{c}}$ such that new information from either DIS or improved determinations of ${\sigma }_{c\overline{c}}$ could significantly impact constraints to the charm sector of the proton wave function.

arXiv comment14 pages, 6 figures

References in corpus (39)

• Supersymmetric Dark Matter
• First results from the LUX dark matter experiment at the Sanford Underground Research Facility
• Parton distributions from high-precision collider data
• Update on scalar singlet dark matter
• Search for Low-Mass WIMPs with SuperCDMS
• The Scalar Strange Content of the Nucleon from Lattice QCD
• Physical Nucleon Properties from Lattice QCD
• Electron Ion Collider: The Next QCD Frontier - Understanding the glue that binds us all
• The nucleon mass in N_f=2 lattice QCD: finite size effects from chiral perturbation theory
• Physics Opportunities of a Fixed-Target Experiment using the LHC Beams
• Lattice computation of the nucleon scalar quark contents at the physical point
• A review of the intrinsic heavy quark content of the nucleon
• WIMP-nucleon scattering with heavy WIMP effective theory
• Nucleon mass, sigma term and lattice QCD
• $\pi$N and strangeness sigma terms at the physical point with chiral fermions
• Numerical solution of $Q^2$ evolution equations in a brute-force method
• Direct Evaluation of the Quark Content of Nucleons from Lattice QCD at the Physical Point
• CT14 Intrinsic Charm Parton Distribution Functions from CTEQ-TEA Global Analysis
• New limits on intrinsic charm in the nucleon from global analysis of parton distributions
• Strangeness and charmness content of nucleon from overlap fermions on 2+1-flavor domain-wall fermion configurations
• The intrinsic strangeness and charm of the nucleon using improved staggered fermions
• Phenomenology of nonperturbative charm in the nucleon
• Intrinsic Charm Parton Distribution Functions from CTEQ-TEA Global Analysis
• Scalar strangeness content of the nucleon and baryon sigma terms
• Towards a Deeper Understanding of How Experiments Constrain the Underlying Physics of Heavy-Ion Collisions
• Nucleon form factors and spin content in a quark-diquark model with a pion cloud
• Halo effective field theory constrains the solar Beryllium-7 + proton -> Boron-8 + photon rate
• Pion structure function from leading neutron electroproduction and SU(2) flavor asymmetry
• A direct probe of the intrinsic charm content of the proton
• Taming the Pion Cloud of the Nucleon
• The Role of Nucleon Strangeness in Supernova Explosions
• Heavy Quark $\bar{q}q$ Matrix Elements in the Nucleon from Perturbative QCD
• Strangeness of the nucleon from Lattice Quantum Chromodynamics
• Constraining nucleon strangeness
• Intrinsic charm content of the nucleon and charmness-nucleon sigma term
• Nucleon Structure Functions from Relativistic Constituent Quarks
• A Euclidean bridge to the relativistic constituent quark model
• Reply to Comment on "New limits on intrinsic charm in the nucleon from global analysis of parton distributions"
• Improving quark flavor separation with forward W and Z production at LHCb

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