Multiple parton interaction studies at DØ
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Here, we present the results of studies of multiparton interactions done by the DØ collaboration using the Fermilab Tevatron at a center of mass energy of 1.96 TeV. We also present three analyses, involving three distinct final signatures: (a) a photon with at least 3 jets ( γ + 3jets), (b) a photon with a bottom or charm quark tagged jet and at least 2 other jets ( γ + b/c + 2jets), and (c) two J/ ψ mesons. The fraction of photon + jet events initiated by double parton scattering is about 20%, while the fraction for events in which two J/ ψ mesons were produced is 30 ± 10. While the two measurements are statistically compatible, the difference might indicate differences in the quark and gluon distribution within a nucleon. Finally, this speculation originates from the fact that photon + jet events are created by collisions with quarks in the initial states, while J/ ψ events are produced preferentially by a gluonic initial state.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- D0 Collaboration
- Grant/Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1260274
- Report Number(s):
- FERMILAB-CONF-14-583-E; 1467637; TRN: US1601648
- Journal Information:
- Nuclear and Particle Physics Proceedings, Vol. 273-275, Issue C; ISSN 2405-6014
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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