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Hard four-jet production in pA collisions

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Abstract

In a suitably chosen back-to-back kinematics, four-jet production in hadronic collisions is known to be dominated by contributions from two independent partonic scattering processes, thus giving experimental access to the structure of generalized two-parton distributions (2GPDs). Here, we show that a combined measurement of the double hard four-jet cross section in proton–proton and proton–nucleus collisions will allow one to disentangle different sources of two-parton correlations in the proton that cannot be disentangled with 4-jet measurements in proton–proton collisions alone. To this end, we analyze in detail the structure of 2GPDs in the nucleus (A), we calculate in the independent nucleon approximation all contributions to the double hard four-jet cross section in pA, and we determine corrections arising from the nuclear dependence of single parton distribution functions. We then outline an experimental strategy for determining the longitudinal two-parton correlations in the proton.

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Notes

  1. Interference effects were also considered recently in [38]. In contrast to our work, however, the main focus in [38] was on the case of scattering of protons off the lightest nuclei (A=2,3). The A-dependence for large A, and the effects of QCD evolution suppressing interference discussed here were not addressed in [38].

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Acknowledgements

We thank Leonid Frankfurt, Vadim Guzey, and Daniele Treliani for useful discussions. The research of MS was partially supported by grant from the US Department of Energy.

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Correspondence to U. A. Wiedemann.

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Blok, B., Strikman, M. & Wiedemann, U.A. Hard four-jet production in pA collisions. Eur. Phys. J. C 73, 2433 (2013). https://doi.org/10.1140/epjc/s10052-013-2433-7

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