Exclusive Processes at Colliders
نویسنده
چکیده
Up to now the investigations at high energies were concentrated on inclusive processes, i.e. processes (measurements) when only one object of many produced simultaneously is recorded. Naively, these processes seem to be difficult but can be well described within the standard parton model. The exclusive processes seems naively easier, but in reality require detailed knowledge of the QCD dynamics, which is not required in the inclusive case. The exclusive production was studied in detail mostly close to the kinematical thresholds. The Tevatron opened a possibility to study the central (semi)exclusive production of mesons (elementary objects) at high energies. A similar program will be carried out in the future at the LHC. Here I review a few examples of exclusive production I have studied recently with my collaborators (for details see Refs. [1,2,3,4,5,6,7,8]). For exclusive production of a single object (Higgs or meson), the mechanism of the reaction depends on the quantum numbers of the object and/or its internal structure. For heavy scalar mesons (scalar quarkonia, scalar glueballs) the mechanism of the production, shown in Fig.1, is the same as for the diffractive Higgs boson production extensively discussed in recent years [10]. The dominant mechanism for the exclusive heavy vector meson production is quite different. Here the dominant processes are shown in Fig.2. These processes were discussed by A. Cisek during this conference [9]. When going to lower energies the mechanism x1, −→ κ1t x2, −→ κ2t x ′ 1 = x ′ 2 h1 h1
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تاریخ انتشار 2009