Searching for hidden matter with long-range angular correlations at e+e− colliders

Redamy Pérez-Ramos,Edward K Sarkisyan-Grinbaum,Miguel-Angel Sanchis-Lozano

doi:10.1103/physrevd.105.053001

Abstract

The analysis of azimuthal correlations in multiparticle production can be useful to uncover the existence of new physics beyond the Standard Model, e.g., Hidden Valley, in $e^+e^-$ annihilation at high energies. In this paper, based on previous theoretical studies and using PYTHIA8 event generator, it is found that both azimuthal and rapidity long-range correlations are enhanced due to the presence of a new stage of matter on top of the QCD partonic cascade. Ridge structures, similar to those observed at the LHC, show up providing a possible signature of new physics at future $e^+e^-$ colliders.

Highlights

In a series of previous papers, particle correlations were used to extract information about intrajet multiparticle dynamics [1], and for the search of new physics beyond the Standard Model (SM) in hadronic high-energy collisions [2,3]
This paper focuses on Hidden Valley (HV) models [13], with a new relatively light hidden sector weakly connecting to the SM
The current analysis rests on two bases: (a) a previous theoretical study of two-particle and three-particle correlations developed by two authors [3,19,20], where the possible HV contribution beyond the SM is incorporated on top of the parton shower, and (b) a Monte Carlo (MC) study using PYTHIA8 [17,18] with different HV sectors incorporated

Summary

INTRODUCTION

In a series of previous papers, particle correlations were used to extract information about intrajet multiparticle dynamics [1], and for the search of new physics beyond the Standard Model (SM) in hadronic high-energy collisions [2,3]. The simplest way of coupling the SM and the Hidden Sector (HS) occurs via a heavy Zv of mass ≳1 TeV, i.e., eþe− → ZÃv → hadrons Another possibility involves mirror partners of the SM quarks (Qv) and leptons ðEvÞ collectively denoted as Fv, charged under both SM and HS, thereby with the capacity of connecting both sectors. Note, that this notation, stressing the parallelism between both SM and HV sectors, should not be pushed too far as Fv can be either a fermion or a boson. Let us stress that decay modes like gv → gvgv, gv → qvqv, and γv → qvqv are similar to SM processes along the partonic cascade before hadronization involving equivalent parameters (like the strong coupling constant) to be developed below

MONTE CARLO STUDY

Two-particle azimuthal correlations

Three-particle azimuthal correlations

RESULTS AND DISCUSSION

CONCLUSIONS