Evidence for top quark production in nucleus-nucleus collisions

CMS Collaboration; 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; Douglas Burns; Douglas John Paul Burns

doi:10.1103/PhysRevLett.125.222001

Evidence for top quark production in nucleus-nucleus collisions

CMS Collaboration, 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, Douglas Burns, Douglas John Paul Burns

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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.

Originele taal-2	English
Artikelnummer	222001
Aantal pagina's	18
Tijdschrift	Phys. Rev. Lett.
Volume	125
Nummer van het tijdschrift	22
DOI's	https://doi.org/10.1103/PhysRevLett.125.222001
Status	Published - 24 nov 2020

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Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-19-001 (CMS Public Pages)

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10.1103/PhysRevLett.125.222001Licentie: CC BY

2006.11110v2Submitted manuscript, 2,54 MB
PhysRevLett.125.222001Final published version, 425 KBLicentie: CC BY

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SRP8: SRP (Zwaartepunt): Hoge-Energiefysica
D'Hondt, J., Van Eijndhoven, N., Craps, B. & Buitink, S.
1/11/12 → 31/10/24
Project: Fundamenteel

Evidence for top quark production in nucleus-nucleus collisions
Blekman, F. (Creator), Bols, E. S. (Creator), Chhibra, S. S. (Creator), D'Hondt, J. (Creator), De Clercq, J. T. (Creator), Lontkovskyi, D. (Creator), Lowette, S. (Creator), Marchesini, I. (Creator), Moortgat, S. (Creator), Python, Q. (Creator), Tavernier, S. (Creator), Van Doninck, W. (Creator), Van Mulders, P. (Creator) & Burns, D. (Creator), HEPData, 6 jul 2020
DOI: 10.17182/hepdata.93878, https://www.hepdata.net/record/ins1802092
Dataset

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Collaboration, CMS., Blekman, F., Bols, E. S., Chhibra, S. S., D'Hondt, J., De Clercq, J., Lontkovskyi, D., Lowette, S., Marchesini, I., Moortgat, S., Python, Q., Tavernier, S., Van Doninck, W., Van Mulders, P., Burns, D., & Burns, D. J. P. (2020). Evidence for top quark production in nucleus-nucleus collisions. Phys. Rev. Lett., 125(22), [222001]. https://doi.org/10.1103/PhysRevLett.125.222001

Collaboration, CMS ; Blekman, Freya ; Bols, Emil Sørensen ; Chhibra, Simranjit Singh ; D'Hondt, Jorgen ; De Clercq, Jarne ; Lontkovskyi, Denys ; Lowette, Steven ; Marchesini, Ivan ; Moortgat, Seth ; Python, Quentin ; Tavernier, Stefaan ; Van Doninck, Walter ; Van Mulders, Petra ; Burns, Douglas ; Burns, Douglas John Paul. / Evidence for top quark production in nucleus-nucleus collisions. In: Phys. Rev. Lett. 2020 ; Vol. 125, Nr. 22.

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title = "Evidence for top quark production in nucleus-nucleus collisions",

abstract = "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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Collaboration, CMS, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Burns, D & Burns, DJP 2020, 'Evidence for top quark production in nucleus-nucleus collisions', Phys. Rev. Lett., vol. 125, nr. 22, 222001. https://doi.org/10.1103/PhysRevLett.125.222001

Evidence for top quark production in nucleus-nucleus collisions. / Collaboration, CMS; Blekman, Freya; Bols, Emil Sørensen; Chhibra, Simranjit Singh; D'Hondt, Jorgen; De Clercq, Jarne; Lontkovskyi, Denys; Lowette, Steven; Marchesini, Ivan; Moortgat, Seth; Python, Quentin; Tavernier, Stefaan; Van Doninck, Walter; Van Mulders, Petra; Burns, Douglas; Burns, Douglas John Paul.

In: Phys. Rev. Lett., Vol. 125, Nr. 22, 222001, 24.11.2020.

Onderzoeksoutput: Article › peer review

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AU - Collaboration, CMS

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AU - Bols, Emil Sørensen

AU - Chhibra, Simranjit Singh

AU - D'Hondt, Jorgen

AU - De Clercq, Jarne

AU - Lontkovskyi, Denys

AU - Lowette, Steven

AU - Marchesini, Ivan

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Evidence for top quark production in nucleus-nucleus collisions

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Evidence for top quark production in nucleus-nucleus collisions

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