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- W2284791103 abstract "In recent years, experiments have collected evidence for new charmonium-like states that do not fit well with the conventional cc picture ? . Two-photon fusion events are a useful production mode for studying such states. The e+ and eare scattered at small angles and are therefore undetected implying that the photons are quasi-real. This allows production of final state with the quantum numbers JPC = o±+, 2±+ , 4±+, . . . ,3++, 5++, . . . 7• A further consequence is that the transverse momentum (PT) of the hadronic system is expected to be low. In addition, these events are characterized by low particle multiplicity and low energy. Any additional energy (Eextra) in the calorimeter not associated with the final state is expected to be small. A process that mimics the characteristics of two-photon events is the initial state radiation (ISR) process. A powerful discriminate against such events is a requirement of large values of M'/niss = (Pe+c Prec)2 where the Pe+e(Pree) is the four momentum of the initial state (reconstructed final state) ." @default.
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- W2284791103 date "2012-01-01" @default.
- W2284791103 modified "2023-09-27" @default.
- W2284791103 title "Studies of Charmonium States in Two-photon fusion at BABAR" @default.
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