Inclusive production of charged hadrons in photon-photon collisions
G Abbiendi, C Ainsley, PF Akesson, G Alexander, G Anagnostou, KJ Anderson, S Asai, D Axen, I Bailey, E Barberio, T Barillari, RJ Barlow, RJ Batley, P Bechtle, T Behnke, KW Bell, PJ Bell, G Bella, A Bellerive, G Benelli Show all
PHYSICS LETTERS B | ELSEVIER SCIENCE BV | Published : 2007
The inclusive production of charged hadrons in the collisions of quasi-real photons (e+ e- → e+ e- + X) has been measured using the OPAL detector at LEP. The data were taken at e+ e- centre-of-mass energies from 183 to 209 GeV. The differential cross-sections as a function of the transverse momentum and the pseudorapidity of the hadrons are compared to theoretical calculations of up to next-to-leading order (NLO) in the strong coupling constant αs. The data are also compared to a measurement by the L3 Collaboration, in which a large deviation from the NLO predictions is observed. © 2007 Elsevier B.V. All rights reserved.