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Evidence for Colour-Octet Mechanism from CERN LEP2 gamma gamma -> J/psi + X Data

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arxiv hep-ph/0112259 v2 pith:5X2VSFRT submitted 2001-12-19 hep-ph hep-ex

M. Klasen , B.A. Kniehl , L.N. Mihaila , M. Steinhauser (Hamburg U.) This is my paper · ORCID
classification hep-phhep-ex
keywords gammadatalep2mesonspredictionsanalysisbottom-flavouredcern
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We present theoretical predictions for the transverse-momentum distribution of J/psi mesons promptly produced in gamma gamma collisions within the factorization formalism of nonrelativistic quantum chromodynamics, including the contributions from both direct and resolved photons, and we perform a conservative error analysis. The fraction of J/psi mesons from decays of bottom-flavoured hadrons is estimated to be negligibly small. New data taken by the DELPHI Collaboration at LEP2 nicely confirm these predictions, while they disfavour those obtained within the traditional colour-singlet model.

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  1. Production of doubly charmed tetraquark $T_{cc}$ via photon-photon fusion at electron-positron colliders

    hep-ph 2024-12 reject novelty 5.0 of 10

    A diquark fragmentation model predicts that photon-photon fusion at CEPC and ILC can produce the doubly charmed tetraquark Tcc with thousands of events per year.

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