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Title: Observation and studies of double $$J/\psi$$ production at the Tevatron

We present the observation of doubly-produced $$J/\psi$$ mesons with the D0 detector at Fermilab in $$p\bar{p}$$ collisions at $$\sqrt{s}=1.96$$ TeV. The production cross section for both singly and doubly-produced $$J/\psi$$ mesons is measured using a sample with an integrated luminosity of 8.1fb$$^{-1}$$. For the first time, the double $$J/\psi$$ production cross section is separated into contributions due to single and double parton scatterings. Using these measurements, we determine the effective cross section $$\sigma_{eff}$$, a parameter characterizing an effective spatial area of the parton-parton interactions and related to the parton spatial density inside the nucleon.
Authors:
;
Publication Date:
OSTI Identifier:
1295697
Report Number(s):
FERMILAB-PUB-14-176-E; arXiv:1406.2380
1299990
DOE Contract Number:
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys.Rev.; Journal Volume: D90; Journal Issue: 11
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
D0
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS