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# Measurement of the top quark mass using charged particles in pp collisions at √s=8  TeV

The CMS Collaboration (2016) Measurement of the top quark mass using charged particles in pp collisions at √s=8  TeV. Physical Review D, 93 (9-1), 1-29, [092006].

Record type: Article

## Abstract

A novel technique for measuring the mass of the top quark that uses only the kinematic properties of its charged decay products is presented. Top quark pair events with final states with one or two charged leptons and hadronic jets are selected from the data set of 8 TeV proton-proton collisions, corresponding to an integrated luminosity of 19.7 fb−1. By reconstructing secondary vertices inside the selected jets and computing the invariant mass of the system formed by the secondary vertex and an isolated lepton, an observable is constructed that is sensitive to the top quark mass that is expected to be robust against the energy scale of hadronic jets. The main theoretical systematic uncertainties, concerning the modeling of the fragmentation and hadronization of b quarks and the reconstruction of secondary vertices from the decays of b hadrons, are studied. A top quark mass of 173.68±0.20(stat) +1.58−0.97(syst)  GeV is measured. The overall systematic uncertainty is dominated by the uncertainty in the b quark fragmentation and the modeling of kinematic properties of the top quark.

Text
fPhysRevD.93 - Version of Record

e-pub ahead of print date: 18 May 2016
Organisations: Physics & Astronomy

## Identifiers

Local EPrints ID: 408353
URI: http://eprints.soton.ac.uk/id/eprint/408353
ISSN: 2470-0010
PURE UUID: fba5f499-ce4d-4361-93a6-8c182ccd88ce
ORCID for Alexander Belyaev: orcid.org/0000-0002-1733-4408

## Catalogue record

Date deposited: 19 May 2017 04:04

## Contributors

Author: Vardan Khachatryan
Corporate Author: The CMS Collaboration