Double Parton Scattering with CMS detector at LHC

Ciangottini, D. (2015) Double Parton Scattering with CMS detector at LHC. Il nuovo cimento C, 38 (1). pp. 1-4. ISSN 1826-9885

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Multi-parton interactions (MPI) are experiencing a growing popularity and are widely invoked to account for observations that cannot be explained otherwise.With the large integrated luminosity available, the Double Parton Scattering (DPS) measurements (2 hard events in the same proton-proton collision) can be performed in different final states and at different energy scales. The proposed contribution is intended to present the CMS results of DPS analysis on W+2jets events. That is actually the first direct measure of DPS with CMS detector. The analyzed data correspond to an integrated luminosity of 5 fb−1 collected in pp collisions. It will be shown how the simulations of W+2jets events with MADGRAPH5+PYTHIA8 (or PYTHIA6) and NLO predictions of POWHEG2+PYTHIA6 (or HERWIG6) provide a good description of the observables but fail to describe the data if multiple parton interactions are not included. Then the fraction of DPS in W+2-jet events is extracted from a DPS+SPS sample and the value measured is fDPS = 0.055 ± 0.002(stat) ± 0.014(syst) with a corresponding effective cross section of σeff = 20.7 ± 0.8(stat) ± 6.5(syst)mb.

Item Type: Article
Uncontrolled Keywords: Accelerators ; Protons and neutrons ; W bosons
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 26 May 2020 09:50
Last Modified: 26 May 2020 09:50

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