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Measurement of exclusive ρ+ρ production in high-Q2 two-photon collisions at LEP

CollaborationWith : Achard, Pablo / Bourquin, Maurice / Braccini, Saverio / Chamizo Llatas, Maria / Deglon, Patrick / Delmeire, Evelyne / Echenard, Bertrand / Extermann, Pierre / Field, John / Kienzle, Maria-Novella / Malgeri, Luca / Natale, Sonia / Pohl, Martin / Straessner, Arno
Published in Physics Letters. B. 2004, vol. 597, no. 1, p. 26-38
Abstract Exclusive ρ+ρ- production in two-photon collisions involving a single highly-virtual photon is studied for the first time with data collected by the L3 experiment at LEP at centre-of-mass energies 89<√s<209GeV with a total integrated luminosity of 854.7 pb−1. The cross section of the process γγ*→ρ+ρ− is determined as a function of the photon virtuality, Q2Q2, and the two-photon centre-of-mass energy, Wγγ, in the kinematic region: 1.2<Q2<30GeV2 and 1.1<Wγγ<3GeV. The ρ+ρ−ρ+ρ− production cross section is found to be of the same magnitude as the cross section of the process γγ*→ρ0ρ0, measured in the same kinematic region by L3, and to have similar Wγγ and Q2Q2 dependences
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L3 COLLABORATION. Measurement of exclusive ρ+ρ production in high-Q2 two-photon collisions at LEP. In: Physics Letters. B, 2004, vol. 597, n° 1, p. 26-38. doi: 10.1016/j.physletb.2004.07.013 https://archive-ouverte.unige.ch/unige:42267

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Deposited on : 2014-11-28

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