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Title: Multiple parton interaction studies at DØ

Abstract

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.

Authors:
 [1]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
D0 Collaboration
OSTI Identifier:
1260274
Report Number(s):
FERMILAB-CONF-14-583-E
Journal ID: ISSN 2405-6014; 1467637; TRN: US1601648
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear and Particle Physics Proceedings
Additional Journal Information:
Journal Volume: 273-275; Journal Issue: C; Journal ID: ISSN 2405-6014
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; jets; multiparton; photons; J/ψ

Citation Formats

Lincoln, D. Multiple parton interaction studies at DØ. United States: N. p., 2016. Web. doi:10.1016/j.nuclphysbps.2015.09.344.
Lincoln, D. Multiple parton interaction studies at DØ. United States. doi:10.1016/j.nuclphysbps.2015.09.344.
Lincoln, D. Fri . "Multiple parton interaction studies at DØ". United States. doi:10.1016/j.nuclphysbps.2015.09.344. https://www.osti.gov/servlets/purl/1260274.
@article{osti_1260274,
title = {Multiple parton interaction studies at DØ},
author = {Lincoln, D.},
abstractNote = {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.},
doi = {10.1016/j.nuclphysbps.2015.09.344},
journal = {Nuclear and Particle Physics Proceedings},
number = C,
volume = 273-275,
place = {United States},
year = {2016},
month = {4}
}

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