Short term (4 months) studentships at CERN to work on: "Novel measurement of quark/gluon jets at the LHC using OpenData"

CMS
1

Abstract

In a recent paper [1], we presented a new proposal on how to measure quark/gluon jet properties at the LHC. The measurement strategy takes advantage of the fact that the LHC has collected data at different energies. Measurements at two or more energies can be combined to yield distributions of any jet property separated into quark and gluon jet samples on a statistical basis, without the need for an independent event-by-event tag. We illustrated our method with a variety of different angularity observables, and discussed how to narrow down the search for the most useful observables. In previous studies [2] it has been shown that MC generators can vary significantly in how the internal structure of gluon jets looks, Therefore, the proposed measurement can serve as a guideline in improving MC generators.

Preliminary study has shown that there is a chance to determine the proposed observables using data publicly available within CMS OpenData [3]. The main task of the project will be to actually see if this is really possible and, if so, to carry out an appropriate analysis of the data.

  1. P. Baroň, M.H. Seymour, A. Siódmok, “Novel approach to measure quark/gluon jets at the LHC”, Eur.Phys.J.C 84 (2024) 1, 28, 2307.15378
  2. P. Gras et al. “Systematics of quark/gluon tagging”, JHEP 07 (2017) 091, 1704.03878
  3. https://opendata.cern.ch/

See also Project description

Location:
CERN

Duration of the scholarship:
4 months

Requirements:
Candidates should be PhD students or young postdocs with experience in particle physics (HEP). Familiarity with CMS OpenData and HEP tools will be an advantage.

Starting data:
The position is expected to start between February 1 and March 31, 2025.

Applications:

Candidates should send their application (CV, list of publications and research statement) as a single PDF file to andrzej.siodmok@uj.edu.pl
and arrange a recommendation letter form the supervisor to be sent directly to the same address.

Deadline:
The applications will be taken until the position is filled, but priority will be given to applications received before 31.01.2025.

Contact persons:
Andrzej Siodmok (Andrzej.Siodmok@cern.ch)
Michael Seymour (Michael.Seymour@manchester.ac.uk)

More information is here: