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Search for FCNC single top-quark production at √s=7 TeV with the ATLAS detector

Author
Aad, G.; ATLAS Collaboration; Barreiro Alonso, Fernandountranslated; Cantero, J.; De la Torre, H.; Del Peso, J.; Labarga Echeverría, Luis Alfonsountranslated; Glasman Kuguel, Claudia Beatrizuntranslated; Llorente Merino, J.; Lagouri, T.; March, Luis; Nebot, Eduardo; Terrón, J.
Entity
UAM. Departamento de Física Teórica
Publisher
CERN; Elsevier
Date
2012-06-12
Citation
10.1016/j.physletb.2012.05.022
Physics Letters B 712.4-5 (2012): 351-369
 
 
 
ISSN
0370-2693 (print); 1873-2445 (online)
DOI
10.1016/j.physletb.2012.05.022
Funded by
We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRC and Lundbeck Foundation, Denmark; EPLANET and ERC, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNAS, Georgia; BMBF, DFG, HGF, MPG and AvH Foundation, Germany; GSRT, Greece; ISF, MINERVA, GIF, DIP and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; RCN, Norway; MNiSW, Poland; GRICES and FCT, Portugal; MERYS (MECTS), Romania; MES of Russia and ROSATOM, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MVZT, Slovenia; DST/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE and NSF, United States
Project
info:eu-repo/grantAgreement/EC/FP7/246806
Editor's Version
http://dx.doi.org/10.1016/j.physletb.2012.05.022
Subjects
FCNC; Heavy-quark production; Single top quark; Top physics; Física
URI
http://hdl.handle.net/10486/669072
Note
Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAM
Rights
© 2012 CERN

Licencia Creative Commons
Esta obra está bajo una Licencia Creative Commons Atribución 4.0 Internacional.

Abstract

A search for the production of single top-quarks via flavour-changing neutral-currents is presented. Data collected with the ATLAS detector at a centre-of-mass energy of √s = 7 TeV, corresponding to an integrated luminosity of 2.05 fb−1, are used. Candidate events with a semileptonic top-quark decay signature are classified as signal- or background-like events by using several kinematic variables as input to a neural network. No signal is observed in the neural network output distribution and a Bayesian upper limit is placed on the production cross-section. The observed upper limit at 95% confidence level on the cross-section multiplied by the t → W b branching fraction is measured to be σqg→t × B(t → W b) < 3.9 pb. This upper limit is converted using a model-independent approach into upper limits on the coupling strengths κugt/Λ < 6.9 · 10−3 TeV−1 and κcgt/Λ < 1.6 · 10−2 TeV−1, where Λ is the new physics scale, and on the branching fractions B(t → ug) < 5.7 · 10−5 and B(t → cg) < 2.7 · 10−4
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Google™ Scholar:Aad, G. - ATLAS Collaboration - Barreiro Alonso, Fernando - Cantero, J. - De la Torre, H. - Del Peso, J. - Labarga Echeverría, Luis Alfonso - Glasman Kuguel, Claudia Beatriz - Llorente Merino, J. - Lagouri, T. - March, Luis - Nebot, Eduardo - Terrón, J.

This item appears in the following Collection(s)

  • Producción científica en acceso abierto de la UAM [15094]

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Universidad Autónoma de Madrid. Biblioteca
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