Identification of jet-like events using a multiplicity detector

R. Singh ,B. Mohanty

doi:10.1140/epjc/s10052-019-6951-9

Abstract

We present a method for studying the detection of jets in high energy hadronic collisions using multiplicity detectors at forward rapidity. Such a study enhances the physics scope of multiplicity detectors at forward rapidities in LHC. At LHC energies the jets may be produced with significant cross section at forward rapidities. A multi-resolution wavelet analysis technique can locate the spatial position of jets due to its feature of space-scale locality. The discrete wavelet proves to be very effective in probing physics simultaneously at different locations in phase space and at different scales to identify jet-like events. The key feature this analysis exploits is the difference in particle density in localized regions of the detector due to jet-like and underlying events. We find that this method has a significant sensitivity towards detecting jet position and its size. The jets can be found with the efficiency and purity of the order of 46% with a cut of three times the root mean square of the typical wavelet coefficients distribution in minimum bias events.

Highlights

In pp collisions, di-jet events will appear with jets lying back-to-back in azimuthal angle
We demonstrate that the discrete wavelet transformation (DWT) proves to be very useful in identifying jet-like events in terms of their position and size
We have reported a multi-resolution analysis technique to identify jet-like events in a multiplicity detector at Large Hadron Collider (LHC) energies

Summary

Introduction

Di-jet events will appear with jets lying back-to-back in azimuthal angle. In high energy experiments (e.g. ALICE) these may be studied using the central barrel detectors. One may encounter events where the barrel detectors see two of more than two jets in an event where the topology may suggest a missing jet which may be in other part of the phase space (forward rapidity). The 3-jet cross section is directly related to the pQCD matrix element as αs and poses higher sensitivity towards αs than di-jet cross section [6,7]. The multi-jet azimuthal angular correlation can be studied and is a useful tool to test the theoretical prediction of multi-jet production processes [8,9,10]

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Conclusion