On relevance of triple-gluon fusion in \(J/\psi \) hadroproduction

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• 作者：Leszek Motyka ; Mariusz Sadzikowski
• 刊名：The European Physical Journal C - Particles and Fields
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：75
• 期：5
• 全文大小：857 KB
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• 作者单位：Leszek Motyka (1)
  Mariusz Sadzikowski (1)
  
  1. Institute of Physics, Jagiellonian University, ?ojasiewicza 11, 30-348, Kraków, Poland
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Elementary Particles and Quantum Field Theory
  Nuclear Physics, Heavy Ions and Hadrons
  Physics beyond the Standard Model
  Measurement Science and Instrumentation
  Astronomy, Astrophysics and Cosmology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1434-6052

文摘

A contribution to \(J/\psi \) hadroproduction is analyzed in which the meson production is mediated by three-gluon partonic state, with two gluons coming from the target and one gluon from the projectile. This mechanism involves double gluon density in one of the protons, hence this contribution enters at a non-leading twist. It is, however, relevant due to an enhancement factor coming from large double gluon density at small \(x\). We calculate the three-gluon contribution to \(J/\psi \) hadroproduction within perturbative QCD in the \(k_T\)-factorization framework. Results are obtained for differential \(p_T\)-dependent cross sections for all \(J/\psi \) polarizations and for the sum over the polarization components. The rescattering contribution is found to provide a significant correction to the standard leading twist cross section at the energies of the Tevatron or the LHC at moderate \(p_T\). We suggest \(J/\psi \) production in proton–nucleus collision as a possible probe of the triple-gluon mechanism.