#### Event Title

Session 2J: Search for Dilepton-Producing Contact Interactions in Proton-Proton Collisions with Center-of-Mass Energy 13 TeV

#### Session Number

Session 2J: 2nd Presentation

#### Advisor(s)

Dr. Peter Dong, IMSA

#### Location

Room A121

#### Start Date

26-4-2018 10:35 AM

#### End Date

26-4-2018 11:20 AM

#### Abstract

Preons are hypothetical particles that make up quarks and leptons. Contact interactions (CI’s) involving such preons would theoretically occur above a characteristic energy scale, denoted . According to the CI model, high-energy interactions at modern accelerators will be affected by preon interactions at energies well below . Using Compact Muon Solenoid (CMS) data, we can determine a lower limit on the energy scale -- an energy below which we are 95% confident that contact interactions do not occur. Our analysis will use CMS diilepton data with center-of-mass energy 13 TeV and a Monte Carlo simulation of contact interactions to set a new lower limit on the energy scale.

Our group is conducting an analysis to determine if evidence of CI’s can be detected. We will perform all of the steps of an analysis, including event selection, parameterization of lambda, creation of an invariant mass plot, evaluation of systematic undercertainties, statistical analysis, and limit setting. Monte Carlo generators will provide a simulation specific to the CMS detector of what the Standard Model process should look like. We receive data from the CMS experiment and create graphs using Root, a scientific data processing package, to compare it to the Standard Model. We can thus determine the CI model’s agreement with data and set a lower limit on the energy scale .

Session 2J: Search for Dilepton-Producing Contact Interactions in Proton-Proton Collisions with Center-of-Mass Energy 13 TeV

Room A121

Preons are hypothetical particles that make up quarks and leptons. Contact interactions (CI’s) involving such preons would theoretically occur above a characteristic energy scale, denoted . According to the CI model, high-energy interactions at modern accelerators will be affected by preon interactions at energies well below . Using Compact Muon Solenoid (CMS) data, we can determine a lower limit on the energy scale -- an energy below which we are 95% confident that contact interactions do not occur. Our analysis will use CMS diilepton data with center-of-mass energy 13 TeV and a Monte Carlo simulation of contact interactions to set a new lower limit on the energy scale.

Our group is conducting an analysis to determine if evidence of CI’s can be detected. We will perform all of the steps of an analysis, including event selection, parameterization of lambda, creation of an invariant mass plot, evaluation of systematic undercertainties, statistical analysis, and limit setting. Monte Carlo generators will provide a simulation specific to the CMS detector of what the Standard Model process should look like. We receive data from the CMS experiment and create graphs using Root, a scientific data processing package, to compare it to the Standard Model. We can thus determine the CI model’s agreement with data and set a lower limit on the energy scale .