Evidence for Top Quark Production in Nucleus-Nucleus Collisions; Physical Review Letters; Vol. 125, iss. 22

Evidence for Top Quark Production in Nucleus-Nucleus Collisions; Physical Review Letters; Vol. 125, iss. 22

Xehetasun bibliografikoak
Parent link:	Physical Review Letters Vol. 125, iss. 22.— 2020.— [222001, 18 p.]
Erakunde egilea:	Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов
Beste egile batzuk:	Sirunyan A. M., Tumasyan A. R., Adam W. Wolfgang, Ambrogi F. Federico, Tyurin N. E. Nikolay Evgenjevich, Babaev A. A. Anton Anatoljevich
Gaia:	Title screen 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 (σt¯t) 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, σt¯t=2.54+0.84−0.74 and 2.03+0.71−0.64 μb, respectively, are compatible with expectations from scaled proton-proton data and QCD predictions. Режим доступа: по договору с организацией-держателем ресурса
Hizkuntza:	ingelesa
Argitaratua:	2020
Gaiak:	электронный ресурс труды учёных ТПУ
Sarrera elektronikoa:	https://doi.org/10.1103/PhysRevLett.125.222001
Formatua:	Baliabide elektronikoa Liburu kapitulua
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=666233

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