科研之友
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摘要
For the first time in the literature, we discuss the production of a four-jet final state in proton-proton collisions at the LHC through the mechanism of double-parton scattering (DPS), in the context of jets with large rapidity separation. This is the region where searches for a Balitsky-Fadin-Kuraev-Lipatov (BFKL) signal are planned and/or being performed. The DPS contributions are calculated within the so-called factorized ansatz, and each step of DPS is calculated in the leading order (LO) collinear approximation. The LO pQCD calculations are shown to give a reasonably good description of recent CMS and ATLAS data on inclusive jet production; therefore, this formalism can be used to estimate the DPS effects. We demonstrate that the relative contribution (with respect to single parton scattering dijets and to the BFKL Mueller-Navelet jets) of DPS is growing at large rapidity distance between jets. This is consistent with our experience from previous studies of DPS effects in the case of open and hidden charm production. The calculated differential cross sections, as a function of rapidity distance between the jets that are the most remote in rapidity, are compared with recent results of leading logarithm and next-to-leading logarithm BFKL calculations for the Mueller-Navelet jet production at root s = 7 TeV. The DPS contribution to widely rapidity separated jet production is carefully studied for the present energy root s = 7 TeV, and also at the nominal LHC energy root s = 14 TeV and in different ranges of jet transverse momenta. The differential cross section as a function of dijet transverse momenta as well as two-dimensional (p(T)(y(min))) x p(T)(y(max)))-plane correlations for DPS mechanism are also presented. Some ideas as to how the DPS effects could be studied in the case of four-jet production are suggested.
- 出版日期2014-7-15
