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Measurements of Angular Distributions of Drell-Yan Dimuons in $p+p$ and $p+d$ Interactions at 120 GeV/$$c$$

Journal Article · · No journal information
OSTI ID:3016038
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  1. Christian Brothers U.; Los Alamos; Taiwan, Inst. Phys.; Tokyo Inst. Tech.
  2. New Mexico State U.; Virginia U.
  3. New Mexico State U.
  4. Virginia U.; Tokyo Inst. Tech.; Nishina Ctr., RIKEN
  5. Los Alamos
  6. Michigan U.; Los Alamos
  7. Argonne
  8. Michigan U.
  9. Abilene Christian U.
  10. Taiwan, Inst. Phys.
  11. Illinois U., Urbana
  12. Fermilab
  13. Mississippi State U.; Rutgers U., Piscataway
  14. Rutgers U., Piscataway
  15. Nishina Ctr., RIKEN
  16. Taiwan, Natl. Normal U.
  17. Colorado U.
  18. Yamagata U.
  19. Tokyo Inst. Tech.
  20. Maryland U.
  21. Illinois U., Urbana; Argonne
  22. Michigan U.; Fermilab
  23. Michigan U.; Argonne
  24. KEK, Tsukuba
  25. Tokyo Inst. Tech.; Nishina Ctr., RIKEN
  26. Taiwan, Inst. Phys.; Taiwan, Natl. Normal U.
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We present experimental results on the angular distributions of Drell-Yan muons produced by a 120 GeV/$$c$$ proton beam interacting with liquid hydrogen and deuterium targets. The dimuon angular distributions in both polar ($$θ$$) and azimuthal ($$ϕ$$) angles in the Collins-Soper frame are measured within the kinematic range of $$4.5 < m_{μμ} < 10\ \mathrm{GeV}/c^2$$, $$0.19 < p_T < 2.24\ \mathrm{GeV}/c$$, and $$0 < x_F < 0.95$$. Unlike the results of a previous proton-induced Drell-Yan experiment at a higher energy, the data reveal a pronounced $$\cos 2ϕ$$ modulation in the angular distributions. Comparison with perturbative QCD (pQCD) predictions shows statistically significant deviations, with p-values of 3.5% for the $p+p$ and 1.5% for the $p+d$ Drell-Yan processes. These results suggest the presence of nonperturbative QCD contributions.
Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Christian Brothers U.; Maryland U.; Nishina Ctr., RIKEN; Taiwan, Inst. Phys.; Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Abilene Christian U.; Rutgers U., Piscataway; Argonne National Laboratory (ANL), Argonne, IL (United States); Mississippi State U.; New Mexico State U.; Taiwan, Natl. Normal U.; Tokyo Inst. Tech.; Michigan U.; Virginia U.; Illinois U., Urbana; Colorado U.; Yamagata U.; KEK, Tsukuba
Sponsoring Organization:
US Department of Energy
DOE Contract Number:
89243024CSC000002
OSTI ID:
3016038
Report Number(s):
FERMILAB-PUB-26-0047-PPD; oai:inspirehep.net:3110759; arXiv:2601.16410
Journal Information:
No journal information, Journal Name: No journal information
Country of Publication:
United States
Language:
English

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