APS : Exploring High-Purity Multiparton Scattering at Hadron Colliders

Andersen, Jeppe R.; Rottoli, Luca; Monni, Pier Francesco; Salam, Gavin P.; Soto-Ontoso, Alba

doi:10.1103/PhysRevLett.132.041901

Article
Report number	arXiv:2307.05693 ; CERN-TH-2023-055 ; DCPT/23/54 ; IPPP/23/27 ; OUTP-23-04P ; ZU-TH 17/23
Title	Exploring High-Purity Multiparton Scattering at Hadron Colliders
Author(s)	Andersen, Jeppe R. (Durham U.) ; Monni, Pier Francesco (CERN) ; Rottoli, Luca (Zurich U.) ; Salam, Gavin P. (Oxford U., Theor. Phys. ; Oxford U.) ; Soto-Ontoso, Alba (CERN)
Publication	2024-01-23
Imprint	2023-07-11
Number of pages	6
Note	5 pages + supplementary material. Matches version published in PRL
In:	Phys. Rev. Lett. 132 (2024) 041901
DOI	10.1103/PhysRevLett.132.041901 (publication)
Subject category	hep-ex ; Particle Physics - Experiment ; hep-ph ; Particle Physics - Phenomenology
Abstract	Multi-parton interactions are a fascinating phenomenon that occur in almost every high-energy hadron--hadron collision, yet are remarkably difficult to study quantitatively. In this letter we present a strategy to optimally disentangle multi-parton interactions from the primary scattering in a collision. That strategy enables probes of multi-parton interactions that are significantly beyond the state of the art, including their characteristic momentum scale, the interconnection between primary and secondary scatters, and the pattern of three and potentially even more simultaneous hard scatterings. This opens a path to powerful new constraints on multi-parton interactions for LHC phenomenology and to the investigation of their rich field-theoretical structure.
Copyright/License	preprint: (License: CC BY 4.0) publication: © 2024-2025 authors (License: CC BY 4.0), sponsored by SCOAP³

$Illustration of some MPI configurations that will be probed in this paper: (a) standard double hard scattering, producing a $Z$ boson and a pair of jets; (b) perturbative interconnection between the partons involved in the two hard scatterings, where the $\bar q$ that produces the $Z$ and the $q$ that scatters to produce the dijet system both have a common origin in the perturbative splitting of a gluon; and (c) a process with three hard scatterings.$ $The cumulative inclusive jet spectrum $\langle n(p_{tj,\min}) \rangle_{C_Z}$ normalised to the number of events passing the cut $p_{tZ} < C_Z = 2\GeV$, with MPI on and off. The lower panel shows the fraction of jets that come from the MPI, demonstrating purity of $50{-}90\%$ across a broad range of $p_{tj,\min}$ jet cuts.$ $Pythia8+MiNNLO and dShower results for the $r_{15/2}$ ratio of Eq.~(\ref{eq:DGS-ratio}). Note the deviation from $1$ when perturbative interconnection is turned on between the primary and secondary hard scatters, i.e.\ diagrams as in Fig.~\ref{fig:mixing-hard-proc}b. The dShower bands correspond to scale variation (see \cite{supplement} \S\ref{app:r15-2-dShower} for further details). They include only the $Zgg$ final state, which represents about $50\%$ of independent 2HS, and so should be taken as qualitative. No jet rapidity cut is applied.$ Show more plots

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Record created 2023-07-14, last modified 2024-05-23

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