Campus Units

Physics and Astronomy

Document Type

Article

Publication Version

Published Version

Publication Date

1-5-2009

Journal or Book Title

Physics Letters B

Volume

670

Issue

4-5

First Page

313

Last Page

320

DOI

10.1016/j.physletb.2008.10.064

Abstract

PHENIX has measured the electron-positron pair mass spectrum from 0 to 8 GeV/c(2) in p + p collisions at root s = 200 GeV. The contributions from light meson decays to e(+)e(-) pairs have been determined based on measurements of hadron production cross sections by PHENIX. Within the systematic uncertainty of similar to 20% they account for all e(+)e(-) pairs in the mass region below similar to 1 GeV/c(2). The e(+)e(-) pair yield remaining after subtracting these contributions is dominated by semileptonic decays of charmed hadrons correlated through flavor conservation. Using the spectral shape predicted by PYTHIA, we estimate the charm production cross section to be 544 +/- 39(stat) +/- 142(syst) +/- 200(model) pb. which is consistent with QCD calculations and measurements of single leptons by PHENIX.

Comments

This is an article from Physics Letters B 670 (2009): 313, doi:10.1016/j.physletb.2008.10.064. Posted with permission.

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

Copyright Owner

Elsevier B.V.

Language

en

File Format

application/pdf

Share

COinS