skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Search for same-sign top-quark pair production at sqrt(s) = 7 TeV and limits on flavour changing neutral currents in the top sector

Abstract

An inclusive search for same-sign top-quark pair production in pp collisions at sqrt(s) = 7 TeV is performed using a data sample recorded with the CMS detector in 2010, corresponding to an integrated luminosity of 35 inverse picobarns. This analysis is motivated by recent studies of p p-bar to t t-bar reporting mass-dependent forward-backward asymmetries larger than expected from the standard model. These asymmetries could be due to Flavor Changing Neutral Currents (FCNC) in the top sector induced by t-channel exchange of a massive neutral vector boson (Z'). Models with such a Z' also predict enhancement of same-sign top-pair production in pp or p p-bar collisions. Limits are set as a function of the Z' mass and its couplings to u and t quarks. These limits disfavour the FCNC interpretation of the Tevatron results.

Authors:
 [1];
  1. Yerevan Physics Inst. (Armenia)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
CMS Collaboration
OSTI Identifier:
1155752
Report Number(s):
FERMILAB-PUB-11-727-CMS; CERN-PH-EP-2011-087
Journal ID: ISSN 1029-8479; arXiv eprint number arXiv:1106.2142
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Volume: 2011; Journal Issue: 8; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Chatrchyan, Serguei, and et al. Search for same-sign top-quark pair production at sqrt(s) = 7 TeV and limits on flavour changing neutral currents in the top sector. United States: N. p., 2011. Web. doi:10.1007/JHEP08(2011)005.
Chatrchyan, Serguei, & et al. Search for same-sign top-quark pair production at sqrt(s) = 7 TeV and limits on flavour changing neutral currents in the top sector. United States. doi:10.1007/JHEP08(2011)005.
Chatrchyan, Serguei, and et al. Mon . "Search for same-sign top-quark pair production at sqrt(s) = 7 TeV and limits on flavour changing neutral currents in the top sector". United States. doi:10.1007/JHEP08(2011)005. https://www.osti.gov/servlets/purl/1155752.
@article{osti_1155752,
title = {Search for same-sign top-quark pair production at sqrt(s) = 7 TeV and limits on flavour changing neutral currents in the top sector},
author = {Chatrchyan, Serguei and et al.},
abstractNote = {An inclusive search for same-sign top-quark pair production in pp collisions at sqrt(s) = 7 TeV is performed using a data sample recorded with the CMS detector in 2010, corresponding to an integrated luminosity of 35 inverse picobarns. This analysis is motivated by recent studies of p p-bar to t t-bar reporting mass-dependent forward-backward asymmetries larger than expected from the standard model. These asymmetries could be due to Flavor Changing Neutral Currents (FCNC) in the top sector induced by t-channel exchange of a massive neutral vector boson (Z'). Models with such a Z' also predict enhancement of same-sign top-pair production in pp or p p-bar collisions. Limits are set as a function of the Z' mass and its couplings to u and t quarks. These limits disfavour the FCNC interpretation of the Tevatron results.},
doi = {10.1007/JHEP08(2011)005},
journal = {Journal of High Energy Physics (Online)},
issn = {1029-8479},
number = 8,
volume = 2011,
place = {United States},
year = {2011},
month = {8}
}