Measurement of the mass difference between top quark and antiquark in pp collisions at [formula omitted

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Micheli ,M Guthoff ,T Schöerner-Sadenius ,P Baillon ,P Eller ,H Castilla‐Valdez ,G Hamel De Monchenault ,H.s Chen ,A Tumasyan ,L Calligaris ,M Bachtis ,O Evdokimov ,E Friis ,T Maënpaä ,Rebekka Sophie Höing ,Pierre Gras ,R Carroll ,P Kurt ,J Martínez-Ortega ,G Karapostoli ,T Camporesi ,A Dermenev ,M Feindt ,K Gill ,J Haley ,M Voutilainen ,P Goldenzweig ,B Mangano ,S Dutta ,T Kurča ,P Martinez Ruiz Del Arbol ,A De Cosa ,K Buńkowski ,D Acosta ,R D’alessandro ,X Janssen ,N Strobbe ,M Kazana ,R Ruchti ,L Soffi ,E Boos ,P Eerola ,S Brochet ,G Zumerle ,A Moeller ,G Ryu ,H Nguyen ,I J Cabrillo ,B R Drell ,M Hildreth ,V Karjavin ,K M Ecklünd ,S Marcellini ,G P Heath ,C Fabjan ,D Contardo ,S Tkaczyk ,A Y Rodríguez-Marrero ,D Baumgartel ,E E Kangal ,G Broccolo ,W J Spalding ,E Auffray ,K F Johnson ,M Dobson ,A Saha ,S Fonseca De Souza ,S Linn ,C Farrell ,C Roland ,J Heilman ,P Wittich ,S Gonzi ,S Boutle ,L Gray ,A Florent ,J Milošević ,L Forthomme ,T Christiansen ,S Banerjee ,M Dalchenko ,C Mesropian ,M Peruzzi ,J D Ruiz Alvarez ,S I Cooper ,D Silvers ,M Kenzie ,P Govoni ,F Odorici ,M Bontenackels ,D Carlsmith ,H D Yoo ,J Kolb ,H Prosper ,L Fiore ,P T Cox ,M Serin ,W D Teo ,G I Veres ,R Fischer ,G Mäggi ,A Adıgüzel ,B Wysłouch ,J P Chou ,R López-Fernández ,N Wickramage

doi:10.1016/j.physletb.2017.04.028

Abstract

The invariance of the standard model (SM) under the CPT transformation predicts equality of particle and antiparticle masses. This prediction is tested by measuring the mass difference between the top quark and antiquark (Δmt=mt−mt‾) that are produced in pp collisions at a center-of-mass energy of 8 TeV, using events with a muon or an electron and at least four jets in the final state. The analysis is based on data corresponding to an integrated luminosity of 19.6 fb−1collected by the CMS experiment at the LHC, and yields a value of Δmt=−0.15±0.19(stat)±0.09(syst) GeV, which is consistent with the SM expectation. This result is significantly more precise than previously reported measurements.

Highlights

Symmetries such as charge conjugation (C), parity or space reflection (P), and time reversal (T) play a fundamental role in the standard model (SM) of particle physics [1,2,3]
Simulated Monte Carlo (MC) samples of tt, W, and Z boson production are generated with MadGraph 5.1.3.30 [20] interfaced with pythia 6.4.26 [21] for parton showering
The theoretical cross sections for W boson and Z boson production are calculated with FEWZ [29] at next-to-nextto-leading-order (NNLO) precision of quantum chromodynamics (QCD)

Summary

Introduction

Symmetries such as charge conjugation (C), parity or space reflection (P), and time reversal (T) play a fundamental role in the standard model (SM) of particle physics [1,2,3]. The subsequent measurements by D0, CMS, CDF, and ATLAS, yielding 0.8 ± 1.8 (stat) ± 0.5 (syst) GeV [10], −0.44 ± 0.46 (stat) ± 0.27 (syst) GeV [11], −1.95 ± 1.11 (stat) ± 0.59 (syst) GeV [12], and 0.67 ± 0.61 (stat) ± 0.41 (syst) GeV [13], respectively, are all in agreement with CPT symmetry. This article presents a measurement performed with the CMS [14] detector at the LHC. The ideogram likelihood method [15] is used to measure mt and mt, from which their difference is obtained

The CMS detector

Data and simulation

Event reconstruction and selection

The kinematic fit and the ideogram method

Measurement of mt

Systematic uncertainties

Results and summary

Findings

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Journal: Physics Letters B	Publication Date: Apr 19, 2017
Citations: 9	License type: cc-by

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Measurement of the mass difference between top quark and antiquark in pp collisions at [formula omitted

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