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Search for neutral color-octet weak-triplet scalar particles in proton-proton collisions at $\sqrt{s}$ = 8 TeV


CMS Collaboration; Khachatryan, V; Sirunyan, A M; Tumasyan, A; Amsler, C; Canelli, F; Chiochia, V; De Cosa, A; Hinzmann, A; Hreus, T; Kilminster, B; Lange, C; Mejias, B M; Ngadiuba, J; Pinna, D; Robmann, P; Ronga, F J; Taroni, S; Verzetti, M; Yang, Y; et al (2015). Search for neutral color-octet weak-triplet scalar particles in proton-proton collisions at $\sqrt{s}$ = 8 TeV. Journal of High Energy Physics, 2015(9):201.

Abstract

A search for pair production of neutral color-octet weak-triplet scalar particles ($\theta^0$) is performed in processes where one $\theta^0$ decays to a pair of b quark jets and the other to a $Z$ boson plus a jet, with the Z boson decaying to a pair of electrons or muons. The search is performed with data collected by the CMS experiment at the CERN LHC corresponding to an integrated luminosity of 19.7 $fb^{−1}$ of proton-proton collisions at $\sqrt{s}=8$. The number of observed events is found to be in agreement with the standard model predictions. The 95% confidence level upper limit on the product of the cross section and branching fraction is obtained as a function of the $\theta^0$ mass. The 95% confidence level lower bounds on the $\theta^0$ mass are found to be 623 and 426 GeV, for two different octo-triplet theoretical scenarios. These are the first direct experimental bounds on particles predicted by the octo-triplet model

Abstract

A search for pair production of neutral color-octet weak-triplet scalar particles ($\theta^0$) is performed in processes where one $\theta^0$ decays to a pair of b quark jets and the other to a $Z$ boson plus a jet, with the Z boson decaying to a pair of electrons or muons. The search is performed with data collected by the CMS experiment at the CERN LHC corresponding to an integrated luminosity of 19.7 $fb^{−1}$ of proton-proton collisions at $\sqrt{s}=8$. The number of observed events is found to be in agreement with the standard model predictions. The 95% confidence level upper limit on the product of the cross section and branching fraction is obtained as a function of the $\theta^0$ mass. The 95% confidence level lower bounds on the $\theta^0$ mass are found to be 623 and 426 GeV, for two different octo-triplet theoretical scenarios. These are the first direct experimental bounds on particles predicted by the octo-triplet model

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:19 February 2015
Deposited On:16 Feb 2016 14:02
Last Modified:05 Apr 2016 20:08
Publisher:Springer
ISSN:1029-8479
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/JHEP09(2015)201
Related URLs:http://arxiv.org/abs/1505.08118 (Organisation)

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