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 DPS mechanism for associated $$c\bar{c} b\bar{b}$$ production in AA UPCs

2020 ◽  
Vol 80 (8) ◽  
Author(s):  
Edgar Huayra ◽  
Emmanuel G. de Oliveira ◽  
Roman Pasechnik
Keyword(s):  
Production Process ◽  
Cross Section ◽  
Photon Energy ◽  
Cross Sections ◽  
Effective Cross Section ◽  
Double Parton Scattering ◽  
Quark Pairs ◽  
Numerical Predictions ◽  
Energy Dependent ◽  
Parton Scattering

Abstract We discuss the associated $$c\bar{c}$$cc¯ and $$b\bar{b}$$bb¯ quark pairs production in the double-parton scattering (DPS) process in ultraperipheral (UPCs) AA collisions. We derive an analogue of the inclusive DPS pocket formula and the photon-energy dependent effective cross section considering an overlap between the hard SPS scatterings. We provide numerical predictions for the DPS cross sections for the $$c\bar{c}b\bar{b}$$cc¯bb¯ production process at the typical energies of AA UPCs at the LHC and FCC colliders and also characterize the A dependence of the total UPC DPS cross section.

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 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.

scholarly journals Double parton scattering: A study of the effective cross section within a Light-Front quark model

2016 ◽  
Vol 752 ◽  
pp. 40-45 ◽  
Author(s):  
Matteo Rinaldi ◽  
Sergio Scopetta ◽  
Marco Traini ◽  
Vicente Vento
Keyword(s):  
Quark Model ◽  
Cross Section ◽  
Effective Cross Section ◽  
Light Front ◽  
Double Parton Scattering ◽  
Parton Scattering

scholarly journals The effective cross section for double parton scattering within a holographic AdS/QCD approach

2017 ◽  
Vol 768 ◽  
pp. 270-273 ◽  
Author(s):  
Marco Traini ◽  
Matteo Rinaldi ◽  
Sergio Scopetta ◽  
Vicente Vento
Keyword(s):  
Cross Section ◽  
Effective Cross Section ◽  
Double Parton Scattering ◽  
Parton Scattering

ATLAS results on quarkonia and heavy flavor production

2020 ◽  
Vol 35 (34n35) ◽  
pp. 2044003
Author(s):  
Tatiana Lyubushkina
Keyword(s):  
Vector Boson ◽  
Atlas Detector ◽  
Heavy Flavor ◽  
Double Parton Scattering ◽  
Associated Production ◽  
Quarkonium Production ◽  
Heavy Flavor Production ◽  
Parton Scattering ◽  
Production Mechanisms

The associated production a vector boson with [Formula: see text] is a key observable for understanding of the quarkonium production mechanisms, including the separation of single and double parton scattering components. Measurements from the ATLAS detector at LHC on quarkonium production, including associated production of a [Formula: see text] and [Formula: see text] are presented. A study of the hidden-charm states [Formula: see text] is also provided.

scholarly journals Review of recent forward physics results from the CMS experiment

2019 ◽  
Vol 208 ◽  
pp. 05002
Author(s):  
Ralf Ulrich
Keyword(s):  
Cross Sections ◽  
Cosmic Ray ◽  
High Energy ◽  
Forward Physics ◽  
Final State ◽  
Double Parton Scattering ◽  
Cosmic Ray Interactions ◽  
Wide Range ◽  
Very High Energy ◽  
Parton Scattering

There is a rich program of forward physics measurements within the CMS Collaboration covering a wide range of topics. In many cases there is a connection to quantities and effects relevant for very high energy cosmic ray interactions. Some of the recent measurements in the fields of exclusive final states, low-pT inclusive and diffractive cross sections, underlying event, multiparton interactions, double parton scattering, final state particle correlations and minimum bias results are briefly summarized here.

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