Measurement of Z → τ +τ − production in proton-proton collisions at s√=8s=8 TeV; Journal of High Energy Physics; № 9

Measurement of Z → τ +τ − production in proton-proton collisions at s√=8s=8 TeV; Journal of High Energy Physics; № 9

Bibliographic Details
Parent link:Journal of High Energy Physics
№ 9.— 2018.— [159, 19 p.]
Corporate Authors: Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов, Национальный исследовательский Томский политехнический университет Инженерная школа информационных технологий и робототехники Отделение автоматизации и робототехники (ОАР)
Other Authors: Aaij R. Roel, Adeva B. Bernardo, Adinolfi M. Marco, Panshin G. L. Gennady Leonidovich, Strokov S. A. Sergey Aleksandrovich, Vagner A. R. Aleksandr Rudolfovich
Summary:Title screen
A measurement of Z → τ +τ − production cross-section is presented using data, corresponding to an integrated luminosity of 2 fb−1, from pp collisions at s√=8s=8 TeV collected by the LHCb experiment. The τ +τ − candidates are reconstructed in final states with the first tau lepton decaying leptonically, and the second decaying either leptonically or to one or three charged hadrons. The production cross-section is measured for Z bosons with invariant mass between 60 and 120 GeV/c2, which decay to tau leptons with transverse momenta greater than 20 GeV/cand pseudorapidities between 2.0 and 4.5. The cross-section is determined to be σpp→Z→τ+τ−=95.8±2.1±4.6±0.2±1.1σpp→Z→τ+τ−=95.8±2.1±4.6±0.2±1.1 pb, where the first uncertainty is statistical, the second is systematic, the third is due to the LHC beam energy uncertainty, and the fourth to the integrated luminosity uncertainty. This result is compatible with NNLO Standard model predictions. The ratio of the cross-sections for Z → τ+τ− to Z → μ+μ− (Z → e+e−), determined to be 1.01 ± 0.05 (1.02 ± 0.06), is consistent with the lepton-universality hypothesis in Z decays.
Language:English
Published: 2018
Subjects:
электронный ресурс
труды учёных ТПУ
форвардные операции
физика
лептонные процессы
адронное взаимодействие
Online Access:http://earchive.tpu.ru/handle/11683/57798
https://doi.org/10.1007/JHEP09(2018)159
Format: Electronic Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=658799

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