Evidence for Top Quark Production in Nucleus-Nucleus Collisions

Albert M Sirunyan; Armen Tumasyan; Wolfgang Adam; Federico Ambrogi; Thomas Bergauer; Marko Dragicevic; Janos Erö; Alberto Escalante del Valle; Rudolf Fruehwirth; Manfred Jeitler; Natascha Krammer; Lukas Lechner; Dietrich Liko; Thomas Madlener; Ivan Mikulec; Navid Rad; Jochen Schieck; Robert Schöfbeck; Markus Spanring; Sebastian Templ; Wolfgang Waltenberger; Claudia-Elisabeth Wulz; Mateusz Zarucki; Vladimir Chekhovsky; Aliaksandr Litomin; Vladimir Makarenko; Juan Suarez Gonzalez; Mohamed Rashad Darwish; Eddi A de Wolf; Davide Di Croce; Xavier Janssen; Tomas Kello; Aleksandra Lelek; Maxim Pieters; Haifa Rejeb Sfar; Hans van Haevermaet; Pierre van Mechelen; Senne van Putte; Nick van Remortel; Freya Blekman; Emil Sørensen Bols; Simranjit Singh Chhibra; Jorgen d'Hondt; Jarne de Clercq; Denys Lontkovskyi; Steven Lowette; Ivan Marchesini; Seth Moortgat; Quentin Python; Stefaan Tavernier; Walter van Doninck; Petra van Mulders; Diego Beghin; Bugra Bilin; Barbara Clerbaux; Gilles de Lentdecker; Hugo Delannoy; Brian Dorney; Laurent Favart; Anastasia Grebenyuk; Amandeep Kaur Kalsi; Inna Makarenko; Louis Moureaux; Laurent Pétré; Andrey Popov; Nicolas Postiau; Elizabeth Starling; Laurent Thomas; Catherine Vander Velde; Pascal Vanlaer; David Vannerom; Liam Wezenbeek; Tom Cornelis; Didar Dobur; Illia Khvastunov; Marek Niedziela; Christos Roskas; Kirill Skovpen; Michael Tytgat; Willem Verbeke; Basile Vermassen; Martina Vit; Giacomo Bruno; Florian Joel J Bury; Claudio Caputo; Pieter David; Christophe Delaere; Martin Delcourt; Izzeddin Suat Donertas; Andrea Giammanco; Vincent Lemaitre; Jessica Prisciandaro; Alessia Saggio; Angela Taliercio; Maksym Teklishyn; Pietro Vischia; Sophie Wuyckens; Joze Zobec; Gilvan Alves; Gilson Correia Silva; CMS Collaboration; John Chou

doi:10.1103/PhysRevLett.125.222001

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Evidence for Top Quark Production in Nucleus-Nucleus Collisions

Journal article

Peer reviewed

Evidence for Top Quark Production in Nucleus-Nucleus Collisions

Albert M Sirunyan, Armen Tumasyan, Wolfgang Adam, Federico Ambrogi, Thomas Bergauer, Marko Dragicevic, Janos Erö, Alberto Escalante del Valle, Rudolf Fruehwirth, Manfred Jeitler, …

Phys.Rev.Lett, Vol.125(22), pp.222001-222001

2020

DOI: https://doi.org/10.1103/PhysRevLett.125.222001

PMID: 33315428

Abstract

High Energy Physics - Experiment

Nuclear Experiment

Physics

Ultrarelativistic heavy ion collisions recreate in the laboratory the thermodynamical conditions prevailing in the early universe up to 10-6 sec, thereby allowing the study of the quark-gluon plasma (QGP), a state of quantum chromodynamics (QCD) matter with deconfined partons. The top quark, the heaviest elementary particle known, is accessible in nucleus-nucleus collisions at the CERN LHC, and constitutes a novel probe of the QGP. Here, we report the first evidence for the production of top quarks in nucleus-nucleus collisions, using lead-lead collision data at a nucleon-nucleon center-of-mass energy of 5.02 TeV recorded by the CMS experiment. Two methods are used to measure the cross section for top quark pair production (σtt¯) via the selection of charged leptons (electrons or muons) and bottom quarks. One method relies on the leptonic information alone, and the second one exploits, in addition, the presence of bottom quarks. The measured cross sections, σtt¯=2.54-0.74+0.84 and 2.03-0.64+0.71 μb, respectively, are compatible with expectations from scaled proton-proton data and QCD predictions.

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Title: Evidence for Top Quark Production in Nucleus-Nucleus Collisions
Creators: Albert M Sirunyan - Alikhanyan National Laboratory
Armen Tumasyan - Alikhanyan National Laboratory
Wolfgang Adam
Federico Ambrogi
Thomas Bergauer
Marko Dragicevic
Janos Erö
Alberto Escalante del Valle
Rudolf Fruehwirth
Manfred Jeitler
Natascha Krammer
Lukas Lechner
Dietrich Liko
Thomas Madlener
Ivan Mikulec
Navid Rad
Jochen Schieck
Robert Schöfbeck
Markus Spanring
Sebastian Templ
Wolfgang Waltenberger
Claudia-Elisabeth Wulz
Mateusz Zarucki
Vladimir Chekhovsky
Aliaksandr Litomin
Vladimir Makarenko
Juan Suarez Gonzalez
Mohamed Rashad Darwish - University of Antwerp
Eddi A de Wolf - University of Antwerp
Davide Di Croce - University of Antwerp
Xavier Janssen - University of Antwerp
Tomas Kello - University of Antwerp
Aleksandra Lelek - University of Antwerp
Maxim Pieters - University of Antwerp
Haifa Rejeb Sfar
Hans van Haevermaet - University of Antwerp
Pierre van Mechelen - University of Antwerp
Senne van Putte - University of Antwerp
Nick van Remortel - University of Antwerp
Freya Blekman - Vrije Universiteit Brussel
Emil Sørensen Bols - Vrije Universiteit Brussel
Simranjit Singh Chhibra - Vrije Universiteit Brussel
Jorgen d'Hondt - Vrije Universiteit Brussel
Jarne de Clercq - Vrije Universiteit Brussel
Denys Lontkovskyi - Vrije Universiteit Brussel
Steven Lowette - Vrije Universiteit Brussel
Ivan Marchesini - Vrije Universiteit Brussel
Seth Moortgat - Vrije Universiteit Brussel
Quentin Python - Vrije Universiteit Brussel
Stefaan Tavernier - Vrije Universiteit Brussel
Walter van Doninck - Vrije Universiteit Brussel
Petra van Mulders - Vrije Universiteit Brussel
Diego Beghin - Université Libre de Bruxelles
Bugra Bilin - Université Libre de Bruxelles
Barbara Clerbaux - Université Libre de Bruxelles
Gilles de Lentdecker - Université Libre de Bruxelles
Hugo Delannoy - Université Libre de Bruxelles
Brian Dorney - Université Libre de Bruxelles
Laurent Favart - Université Libre de Bruxelles
Anastasia Grebenyuk - Université Libre de Bruxelles
Amandeep Kaur Kalsi - Université Libre de Bruxelles
Inna Makarenko - Université Libre de Bruxelles
Louis Moureaux - Université Libre de Bruxelles
Laurent Pétré - Université Libre de Bruxelles
Andrey Popov - Université Libre de Bruxelles
Nicolas Postiau - Université Libre de Bruxelles
Elizabeth Starling - Université Libre de Bruxelles
Laurent Thomas - Université Libre de Bruxelles
Catherine Vander Velde
Pascal Vanlaer - Université Libre de Bruxelles
David Vannerom - Université Libre de Bruxelles
Liam Wezenbeek - Université Libre de Bruxelles
Tom Cornelis - Ghent University
Didar Dobur - Ghent University
Illia Khvastunov - Ghent University
Marek Niedziela - Ghent University
Christos Roskas - Ghent University
Kirill Skovpen - Ghent University
Michael Tytgat - Ghent University
Willem Verbeke - Ghent University
Basile Vermassen - Ghent University
Martina Vit - Ghent University
Giacomo Bruno - UCLouvain
Florian Joel J Bury - UCLouvain
Claudio Caputo - UCLouvain
Pieter David
Christophe Delaere - UCLouvain
Martin Delcourt - UCLouvain
Izzeddin Suat Donertas - UCLouvain
Andrea Giammanco - UCLouvain
Vincent Lemaitre - UCLouvain
Jessica Prisciandaro - UCLouvain
Alessia Saggio - UCLouvain
Angela Taliercio - UCLouvain
Maksym Teklishyn - UCLouvain
Pietro Vischia - UCLouvain
Sophie Wuyckens - UCLouvain
Joze Zobec - UCLouvain
Gilvan Alves
Gilson Correia Silva
CMS Collaboration
John Chou - Physics and Astronomy (SAS)
Publication Details: Phys.Rev.Lett, Vol.125(22), pp.222001-222001
Date published: 2020
Academic Unit: Physics and Astronomy (SAS)
Language: English
Resource Type: Journal article
Identifiers: 991031758164504646