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Final SeaQuest results on the flavor asymmetry of the proton light-quark sea with proton-induced Drell-Yan process

FNAL E906/SeaQuest Collaboration, :, C. H. Leung, J. Dove, K. Nagai, K. Nakano, S. Prasad, A. S. Tadepalli, C. A. Aidala, J. Arrington, C. Ayuso, C. L. Barker, W. C. Chang, A. Chen, D. C. Christian, B. P. Dannowitz, L. El Fassi, D. F. Geesaman, R. Gilman, Y. Goto, R. S. Guo, L. Guo, T. J. Hague, R. J. Holt, M. F. Hossain, L. D. Isenhower, E. R. Kinney, A. Klein, D. Kleinjan, P. -J. Lin, K. Liu, M. X. Liu, W. Lorenzon, R. E. McClellan, P. L. McGaughey, M. M. Medeiros, Y. Miyachi, S. Miyasaka, D. H. Morton, K. Nakahara, J. C. Peng, A. J. R. Puckett, A. Pun, B. J. Ramson, P. E. Reimer, J. G. Rubin, F. Sanftl, S. Sawada, T. Sawada, M. B. C. Scott, T. -A. Shibata, D. -S. Su, M. Teo, R. Towell, S. Uemura, S. G. Wang, J. Wu, N. Wuerfel, Z. H. Ye

Abstract

The Fermilab E906/SeaQuest collaboration performed measurements of the Drell-Yan process using 120 GeV proton beams bombarding liquid hydrogen and liquid deuterium targets. A combined analysis of all collected data was performed to obtain the final results for the $σ_{pd}/2σ_{pp}$ Drell-Yan cross section ratio covering the kinematic region of $0.13 < x < 0.45$. The $x$-dependencies of $\bar{d}\left(x\right) / \bar{u}\left(x\right)$ and $\bar{d}\left(x\right) - \bar{u}\left(x\right)$ are extracted from these cross section ratios. It is found that $\bar{d}\left(x\right)$ is greater than $\bar{u}\left(x\right)$ over the entire measured $x$ range, with improved statistical accuracy compared to previous measurements. The new results on $\bar{d}\left(x\right) / \bar{u}\left(x\right)$ and $\bar{d}\left(x\right) - \bar{u}\left(x\right)$ are compared to various parton distribution functions and theoretical calculations.

Final SeaQuest results on the flavor asymmetry of the proton light-quark sea with proton-induced Drell-Yan process

Abstract

The Fermilab E906/SeaQuest collaboration performed measurements of the Drell-Yan process using 120 GeV proton beams bombarding liquid hydrogen and liquid deuterium targets. A combined analysis of all collected data was performed to obtain the final results for the Drell-Yan cross section ratio covering the kinematic region of . The -dependencies of and are extracted from these cross section ratios. It is found that is greater than over the entire measured range, with improved statistical accuracy compared to previous measurements. The new results on and are compared to various parton distribution functions and theoretical calculations.

Paper Structure

This paper contains 1 section, 2 equations, 4 figures, 4 tables.

Table of Contents

  1. End Matter

Figures (4)

  • Figure 1: Dimuon mass distribution for events collected on liquid hydrogen target for the second data set. The data points (solid squares) are compared with a fit consisting of various components (see text).
  • Figure 2: Measured $\sigma_{pd}/2\sigma_{pp}$ Drell-Yan cross section ratio from SeaQuest compared calculations using CJ22 accardi2023, and NNPDF4.0 ball2022a. The error bands on the theoretical calculations correspond to the 68% confidence level from the PDFs.
  • Figure 3: The extracted $\bar{d}(x)/\bar{u}(x)$ (left) and $\bar{d}(x)-\bar{u}(x)$ (right) from the measured $\sigma_{pd}/2\sigma_{pp}$ Drell-Yan cross section ratio from SeaQuest (red squares), E866 towell2001 (black circles), and HERMES ackerstaff1998 (blue triangles). The extracted ratios are compared with CJ22 accardi2023, and NNPDF4.0 ball2022a global PDF analyses (top), and with predictions from statistical model soffer2019 and meson cloud model alberg2022 (bottom). The error bands on the PDFs correspond to their 68% confidence level.
  • Figure 4: Measured $\sigma_{pd}/2\sigma_{pp}$ Drell-Yan cross section ratio as functions of $x_1$ (left), and $x_F$ (right) from SeaQuest compared calculations using CJ22 accardi2023, and NNPDF4.0 ball2022a. The error bands on the theoretical calculations correspond to the 68% confidence level from the PDFs.