Study of Inclusive J/psi Production in Two-Photon Collisions at LEP II with the DELPHI Detector
The DELPHI Collaboration, J. Abdallah
Abstract
Inclusive J/psi production in photon-photon collisions has been observed at LEP II beam energies. A clear signal from the reaction gamma gamma -> J/psi+X is seen. The number of observed N(J/psi -> mu+mu-) events is 36 +/- 7 for an integrated luminosity of 617 pb-1, yielding a cross-section of sigma(J/psi+X) = 45 +/- 9 (stat) +/- 17 (syst) pb. Based on a study of the event shapes of different types of gamma gamma processes in the PYTHIA program, we conclude that (74 +/- 22)% of the observed J/psi events are due to `resolved' photons, the dominant contribution of which is most probably due to the gluon content of the photon.
Create a lesson
Related papers
Probing the proton structure with minimum bias and low-pt dimuon events at hadron colliders
Kyle Cormier
Amplitude analysis of ψ(3686) radiative decays into π0 π0 system
BESIII Collaboration, M. Ablikim, M. N. Achasov et al.
Real-time monitoring of LHCb beam spot properties based on FPGA hit reconstruction
Giulio Cordova, Elena Graverini, Daniele Passaro et al.
New results from electron-positron heavy-flavor factories
Xiaodong Shi
Experimental Demonstration of Soft-Tissue Muon Scattering Tomography
Dipanwita Banerjee, Benjamin Banto Oberhauser, Paolo Crivelli et al.
Measurements of lepton-flavour universality in semileptonic B decays at Belle and Belle II
Andreas Warburton