Article
Photoproduction of J/psi and of high mass e(+)e(-) in ultra-peripheral Au plus Au collisions at root s(NN)=200 GeV
Physics Letters B
Document Type
Article
Disciplines
Publication Version
Published Version
Publication Date
8-31-2009
DOI
10.1016/j.physletb.2009.07.061
Abstract
We present the first measurement of photoproduction of J/psi and of two-photon production of high-mass e(+)e(-) pairs in electromagnetic (or ultra-peripheral) nucleus-nucleus interactions, using Au + Au data at root s(NN) = 200 GeV. The events are tagged with forward neutrons emitted following Coulomb excitation of one or both Au* nuclei. The event sample consists of 28 events with m(e+e-) > 2 GeV/c(2) with zero like-sign background. The measured cross sections at midrapidity of d sigma/dy (J/psi + Xn, y = 0) = 76 +/- 33 (stat) +/- 11 (syst) pb and d(2)sigma /dm dy (e(+) e(-) + Xn, y = 0) = 86 +/- 23(stat) +/- 16(syst) mu b/ (GeV/c(2)) for m(e+e-) epsilon vertical bar 2.0, 2.8 vertical bar GeV/c(2) have been compared and found to be consistent with models for photoproduction of J/psi and QED based calculations of two-photon production of e(+)e(-) pairs.
Creative Commons License
Creative Commons Attribution 4.0
Copyright Owner
Elsevier B.V.
Copyright Date
2009
Language
en
File Format
application/pdf
Citation Information
S. Afanasiev, Sergey Belikov, Paul Constantin, Nathan C. Grau, et al.. "Photoproduction of J/psi and of high mass e(+)e(-) in ultra-peripheral Au plus Au collisions at root s(NN)=200 GeV" Physics Letters B Vol. 679 Iss. 4 (2009) p. 321 - 329 Available at: http://works.bepress.com/craig-ogilvie/206/
This is an article from Physics Letters B 679 (2009): 321, doi:10.1016/j.physletb.2009.07.061. Posted with permission.