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Charm Production at NuTeV

NuTeV Collaboration, T. Adams, A. Alton, S. Avvakumov, L. de Barbaro, P. de Barbaro, R. H. Bernstein, A. Bodek, T. Bolton, J. Brau, D. Buchholz, H. Budd, L. Bugel, J. Conrad, R. B. Drucker, R. Frey, J. Formaggio, J. Goldman, M. Goncharov, D. A. Harris, R. A. Johnson, S. Koutsoliotas, J. H. Kim, M. J. Lamm, W. Marsh, D. Mason, C. McNulty, K. S. McFarland, D. Naples, P. Nienaber, A. Romosan, W. K. Sakumoto, H. Schellman, M. H. Shaevitz, P. Spentzouris, E. G. Stern, B. Tamminga, M. Vakili, A. Vaitaitis, V. Wu, U. K. Yang, J. Yu, G. P. Zeller

TL;DR

This work uses NuTeV's sign-selected ν and ν¯ beams to study strange and charm content in the nucleon via DIS. Charged-current charm production is analyzed through dimuon final states with a LO Monte Carlo fit to extract four parameters characterizing the strange sea and charm fragmentation, yielding κ≈0.42, m_c≈1.24 GeV, and a steep sea-shape with β≈8.5. Neutral-current charm production is searched for in wrong-sign muon events, dominated by backgrounds and interpreted as evidence for NC charm production driven by gluon splitting, with predictions explored for m_c in the 1.3–1.7 GeV range. The results are consistent with prior strange-sea measurements and provide constraints on the charm content of the nucleon, illustrating the capabilities of SSQT-based neutrino DIS experiments for nucleon structure studies.

Abstract

Neutrino deep-inelastic scattering provides a means to study both the strange and charm content of the nucleon. The NuTeV experiment (Fermilab E-8Neutrino deep-inelastic scattering provides a means to study both the strange and charm content of the nucleon. The NuTeV experiment (Fermilab E-815) takes full advantage of separated neutrino and anti-neutrino beams to probe the nucleon. The strange sea is studied with charged-current charm production resulting in an opposite-signed two muon final state. The charm content of the nucleon is probed via neutral-current charm production creating an event with a single wrong-signed muon. Preliminary results are presented for both analyses.

Charm Production at NuTeV

TL;DR

This work uses NuTeV's sign-selected ν and ν¯ beams to study strange and charm content in the nucleon via DIS. Charged-current charm production is analyzed through dimuon final states with a LO Monte Carlo fit to extract four parameters characterizing the strange sea and charm fragmentation, yielding κ≈0.42, m_c≈1.24 GeV, and a steep sea-shape with β≈8.5. Neutral-current charm production is searched for in wrong-sign muon events, dominated by backgrounds and interpreted as evidence for NC charm production driven by gluon splitting, with predictions explored for m_c in the 1.3–1.7 GeV range. The results are consistent with prior strange-sea measurements and provide constraints on the charm content of the nucleon, illustrating the capabilities of SSQT-based neutrino DIS experiments for nucleon structure studies.

Abstract

Neutrino deep-inelastic scattering provides a means to study both the strange and charm content of the nucleon. The NuTeV experiment (Fermilab E-8Neutrino deep-inelastic scattering provides a means to study both the strange and charm content of the nucleon. The NuTeV experiment (Fermilab E-815) takes full advantage of separated neutrino and anti-neutrino beams to probe the nucleon. The strange sea is studied with charged-current charm production resulting in an opposite-signed two muon final state. The charm content of the nucleon is probed via neutral-current charm production creating an event with a single wrong-signed muon. Preliminary results are presented for both analyses.

Paper Structure

This paper contains 3 sections, 1 equation, 3 figures.

Table of Contents

  1. Charged-Current Charm Production
  2. Neutral-Current Charm Production
  3. Summary

Figures (3)

  • Figure 1: Feynman diagrams for (a) charged-current and (b) neutral-current charm production via neutrino DIS.
  • Figure 2: Comparison of the NuTeV (with error bands) result to: CCFR result (a); theoretical predictions from CTEQ and GRV.
  • Figure 3: Neutral-current charm production ($\nu$ mode only). (a) NuTeV wrong-sign muon data (points) compared to the sum of the background sources (solid histogram) and systematic errors (curve). The individual background components are also shown as histograms.; (b) Predictions of neutral-current charm production for various values of $m_c$ = 1.3,1.5,1.7.