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Title: Search for pair production of excited top quarks in the lepton + jets final state

Abstract

A search is performed for pair-produced spin-3/2 excited top quarks t*t ¯* , each decaying to a top quark and a gluon. The search uses data collected with the CMS detector from pp collisions at a center-of-mass energy of √s = 8 TeV, selecting events that have a single isolated muon or electron, an imbalance in transverse momentum, and at least six jets, of which one must be compatible with originating from the fragmentation of a b quark. The data, corresponding to an integrated luminosity of 19.5 fb-1, show no significant excess over standard model predictions, and provide a lower limit of 803 GeV at 95% confidence on the mass of the spin-3/2 t* quark in an extension of the Randall-Sundrum model, assuming a 100% branching fraction of its decay into a top quark and a gluon. As a result, this is the first search for a spin-3/2 excited top quark performed at the LHC.

Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI), Yerevan (Armenia). et al.
Publication Date:
Research Org.:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Org.:
The CMS Collaboration
OSTI Identifier:
1151692
Report Number(s):
FERMILAB-PUB-13-621-CMS
Journal ID: ISSN 1029-8479; arXiv eprint number arXiv:1311.5357
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Volume: 2014; Journal Issue: 6; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Hadron-Hadron Scattering; top physics

Citation Formats

Chatrchyan, Serguei. Search for pair production of excited top quarks in the lepton + jets final state. United States: N. p., 2014. Web. doi:10.1007/JHEP06(2014)125.
Chatrchyan, Serguei. Search for pair production of excited top quarks in the lepton + jets final state. United States. https://doi.org/10.1007/JHEP06(2014)125
Chatrchyan, Serguei. 2014. "Search for pair production of excited top quarks in the lepton + jets final state". United States. https://doi.org/10.1007/JHEP06(2014)125. https://www.osti.gov/servlets/purl/1151692.
@article{osti_1151692,
title = {Search for pair production of excited top quarks in the lepton + jets final state},
author = {Chatrchyan, Serguei},
abstractNote = {A search is performed for pair-produced spin-3/2 excited top quarks t*t ¯* , each decaying to a top quark and a gluon. The search uses data collected with the CMS detector from pp collisions at a center-of-mass energy of √s = 8 TeV, selecting events that have a single isolated muon or electron, an imbalance in transverse momentum, and at least six jets, of which one must be compatible with originating from the fragmentation of a b quark. The data, corresponding to an integrated luminosity of 19.5 fb-1, show no significant excess over standard model predictions, and provide a lower limit of 803 GeV at 95% confidence on the mass of the spin-3/2 t* quark in an extension of the Randall-Sundrum model, assuming a 100% branching fraction of its decay into a top quark and a gluon. As a result, this is the first search for a spin-3/2 excited top quark performed at the LHC.},
doi = {10.1007/JHEP06(2014)125},
url = {https://www.osti.gov/biblio/1151692}, journal = {Journal of High Energy Physics (Online)},
issn = {1029-8479},
number = 6,
volume = 2014,
place = {United States},
year = {Wed Nov 19 00:00:00 EST 2014},
month = {Wed Nov 19 00:00:00 EST 2014}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

Figures / Tables:

Figure 1 Figure 1: Kinematic distributions of single$ $ℓ+> 5-jet events in data (points), compared to MC simulation normalized to the number of events observed in data. Shown are $$p$$T spectra for muons (a) and electrons (b), and jet spectra for the channels $$µ$$+jets (c) and e+jets (d). The reconstructed $$m$$tg distributionmore » is shown for the $$µ$$+jets channel in (e) and for e+jets in (f).« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.