8th International Workshop on Multiple Partonic Interactions at the LHC

from 28 November 2016 to 2 December 2016
Hotel Rincón del Arco
Mexico/General timezone
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WG3

Place

Location: Hotel Rincón del Arco
Room: Salón Giralda

Files

Date: from 29 Nov 15:20 to 2 Dec 10:20

Conveners

• 29 Nov 15:20 - 16:30
• Gunnellini, Paolo (DESY)
• Dr. Gaunt, Jonathan (Nikhef)
• 29 Nov 17:00 - 19:00 WG3
• Gunnellini, Paolo (DESY)
• Dr. Gaunt, Jonathan (Nikhef)
• 1 Dec 17:50 - 18:50 WG3
• Gunnellini, Paolo (DESY)
• Dr. Gaunt, Jonathan (Nikhef)
• 2 Dec 09:40 - 10:20 Conclusions/Summary
• Gunnellini, Paolo (DESY)
• Dr. Gaunt, Jonathan (Nikhef)

Timetable | Contribution List

Displaying 13 contributions out of 13
Session: WG3
The ATLAS collaboration has carried out several analyses that are sensitive to hard Double Parton Scattering (DPS). A review of recent results is given. These include the final results of a study of DPS in events with four jets, where uncertainties on the effective DPS cross section are improved compared to preliminary results and differential unfolded distributions are measured, that are sens ... More
Presented by Ewelina LOBODZINSKA on 2/12/2016 at 0:30
Session: WG3
Abstract -------- In [1] Gaunt and Stirling proposed a set of momentum and quark number sum rules, in close analogy to the well known PDF sum rules, that sensible, transverse momentum integrated, double parton distributions (DPDs) should obey. In their work they argued that these sum rules hold under LO QCD evolution, if one assumes that they are fulfilled at the starting scale. While Gaunt an ... More
Presented by Mr. Peter PLÖßL on 2/12/2016 at 0:10
Session: WG3
We present recent results on Double Parton Scattering (DPS) studies using data collected during Run 1 and Run 2 of the LHC with the CMS experiment. Double parton scattering is investigated in several final states including vector bosons and multi-jets. Measurements of observables designed to highlight the DPS contribution are shown and compared to MC predictions from models based on multiple parto ... More
Presented by Mr. Ramandeep KUMAR
Session: WG3
We give an update on a consistent scheme to separate single from double hard scattering, as introduced at last year's MPI@LHC. In particular, several new numerical results will be presented to illustrate the working of the scheme.
Presented by Dr. Jonathan GAUNT on 29/11/2016 at 23:00
Session: WG3
on 29/11/2016 at 21:20
Session: WG3
At transverse momenta that are large compared with nonperturbative scales but much smaller than the hardest scale in the process, DPS can be described by TMD factorisation with transverse-momentum dependent DPDs computed in terms of collinear ones. We describe the formalism and main results of this procedure for double Drell-Yan and double Higgs production, generalising the well-known results for ... More
Presented by Tomas KASEMETS on 29/11/2016 at 23:40
Session: WG3
Measurements of the differential cross sections for the production of at least four jets, two of them initiated by b-quarks, in proton-proton collisions are presented as a function of the transverse momentum pt and pseudorapidity eta, together with the correlations in azimuthal angle and the pt balance among the jets. The data sample was collected in 2010 at a center-of-mass energy of 7 TeV with t ... More
Presented by Paolo GUNNELLINI on 29/11/2016 at 22:10
Session: WG3
We calculate the rate of double open charm production in the forward kinematics studied recently in the LHCb experiment. We find that the mean field approximation for the double parton GPD (Generalized parton distributions), which neglects parton - parton correlations, underestimates the rate by a factor of two. The enhancement due to the perturbative QCD correlation 1->2 mechanism which exp ... More
Presented by Prof. Mark STRIKMAN on 30/11/2016 at 0:20
Session: WG3
We present recent studies on the effects of different kind of correlations in double parton distribution functions (dPDFs). These quantities have been calculated in Ref. [1], within the Light-Front fully Poincar\'e covariant approach and in a constituent quark model framework. This first analysis shows how dynamical correlations, induced by the used model, prevent the factorization o ... More
Presented by Dr. Matteo RINALDI on 1/12/2016 at 23:50
Session: WG3
Double parton scattering (DPS) is highly intriguing since it can provide information on parton transverse profile and parton-parton correlations within a proton. During the LHC Run-I period, DPS is actively explored at LHCb via double $J/\psi$, double charmed hadrons, $\Upsilon$ plus open charm processes. The recent results from LHCb will be presented, including the measurement of double $J/\psi$ ... More
Presented by Ms. An LIUPAN on 29/11/2016 at 21:50
Session: WG3
Soft gluon exchange is an essential part of the dynamics in DPS processes. In processes where factorisation holds, the effects of this exchange are described by soft factors, which give rise to Sudakov logarithms. We discuss progress made in the understanding of the colour dependence of these factors. This leads to significant simplifications both in collinear and in TMD factorisation for D ... More
Presented by Dr. Markus DIEHL, Tomas KASEMETS on 29/11/2016 at 23:20
Session: WG3
In this presentation we discuss some new aspects of double parton scattering in $p p \to c \bar c c \bar c X$ and $p p \to c \bar c jet jet X$. For double $c \bar c$ production we consider rather production of charmed mesons, each of them containing quark $c$ or each of them containg antiquark $\bar c$. Results of two different models are compared. In one of them the D mesons are produced in ... More
Presented by Prof. Antoni SZCZUREK on 30/11/2016 at 0:00
Session: WG3
Same-sign W boson pair production is one of the most promising channels for measuring properties of double parton scattering (DPS) at the LHC. This process has the advantage that the single parton scattering contribution at the same order is forbidden in the Standard Model. The different correlations can have an impact on the size of the DPS cross-section and significantly alter the distributions ... More
Presented by Ms. Sabrina COTOGNO
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