scholarly journals Four-jet production in single- and double-parton scattering within high-energy factorization

2016 ◽  
Vol 2016 (4) ◽  
pp. 1-19 ◽  
Author(s):  
Krzysztof Kutak ◽  
Rafal Maciula ◽  
Mirko Serino ◽  
Antoni Szczurek ◽  
Andreas van Hameren
Keyword(s):  
High Energy ◽  
Jet Production ◽  
Double Parton Scattering ◽  
Parton Scattering

scholarly journals Double Parton Scattering in 4-jet production at the LHC with and without open b-bar

2017 ◽  
Author(s):  
Mirko Serino ◽  
Andreas van Hameren ◽  
Marcin Bury ◽  
Hannes JUNG ◽  
Krzysztof Kutak
Keyword(s):  
Jet Production ◽  
Double Parton Scattering ◽  
Parton Scattering

scholarly journals Probing double parton scattering via associated open charm and bottom production in ultraperipheral pA collisions

2019 ◽  
Vol 79 (10) ◽  
Author(s):  
Edgar Huayra ◽  
Emmanuel G. de Oliveira ◽  
Roman Pasechnik
Keyword(s):  
Effective Cross Section ◽  
High Energy ◽  
Direct Access ◽  
Photon Momentum ◽  
Double Parton Scattering ◽  
Quark Pairs ◽  
Associated Production ◽  
Phenomenological Studies ◽  
Theoretical Predictions ◽  
Parton Scattering

Abstract In this article, we propose a novel channel for phenomenological studies of the double-parton scattering (DPS) based upon associated production of charm $$c{\bar{c}}$$cc¯ and bottom $$b{\bar{b}}$$bb¯ quark pairs in well-separated rapidity intervals in ultraperipheral high-energy proton–nucleus collisions. This process provides direct access to the double-gluon distribution in the proton at small-x and enables one to test the factorized DPS pocket formula. We have made the corresponding theoretical predictions for the DPS contribution to this process at typical LHC energies and beyond and we compute the energy-independent (but photon momentum fraction dependent) effective cross section.

scholarly journals Production of quarkonium pairs in high-energy proton-proton collisions

2019 ◽  
Vol 199 ◽  
pp. 01021 ◽  
Author(s):  
Wolfgang Schäfer
Keyword(s):  
Pair Production ◽  
Cross Sections ◽  
High Energy ◽  
Open Problems ◽  
Proton Proton ◽  
Proton Collisions ◽  
Double Parton Scattering ◽  
Parton Scattering ◽  
To Receive ◽  
Proton Proton Collisions

Recently there has been much interest in the pair production of quarkonia (charmonia, bottomonia). There are two main motivations behind these studies: first, these processes may help to differentiate between different proposed production mechanisms via color-octet and color-singlet QQ̄ -pair production. Second, the production of quarkonium pairs is expected to receive an important contribution from double parton scattering (DPS) processes. There remain a number of open problems, especially with the CMS and ATLAS data. In the kinematics of these experiments, the leading order of $O\left( {\alpha _S^4} \right)$ is clearly not sufficient. The double parton scattering (DPS) contribution was claimed to be large or even dominant in some corners of the phase space, when the rapidity distance Δy between two J/ψ mesons is large. However the effective cross sections σeff found from empirical analyses are about a factor 2.5 smaller than the usually accepted σeff = 15 mb. Here we discuss, which single-parton-scattering mechanisms can mimic the behavior of DPS induced production. Here especially the production of χ-pairs is important.

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