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Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at √s=7 and 8 TeV

Single top quark events produced in the t channel are used to set limits on anomalous Wtb couplings and to search for top quark flavour-changing neutral current (FCNC) interactions. The data taken with the CMS detector at the LHC in proton-proton collisions at √ s = 7 and 8 TeV correspond to int...

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Main Authors: Khachatryan, V., Sirunyan, A. M., Tumasyan, A. R., Adam, Wolfgang, Asilar, Ece, Md. Ali, Mohd. Adli
Format: Article
Language:English
English
Published: Springer Nature 2017
Subjects:
Q Science (General)
QC Physics
Online Access:http://irep.iium.edu.my/63059/1/63059_Search%20for%20anomalous%20Wtb%20couplings%20_article.pdf
http://irep.iium.edu.my/63059/2/63059_Search%20for%20anomalous%20Wtb%20couplings%20_scopus.pdf
http://irep.iium.edu.my/63059/
https://link.springer.com/content/pdf/10.1007%2FJHEP02%282017%29028.pdf
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spelling my.iium.irep.630592019-01-03T04:57:15Z http://irep.iium.edu.my/63059/ Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at √s=7 and 8 TeV Khachatryan, V. Sirunyan, A. M. Tumasyan, A. R. Adam, Wolfgang Asilar, Ece Md. Ali, Mohd. Adli Q Science (General) QC Physics Single top quark events produced in the t channel are used to set limits on anomalous Wtb couplings and to search for top quark flavour-changing neutral current (FCNC) interactions. The data taken with the CMS detector at the LHC in proton-proton collisions at √ s = 7 and 8 TeV correspond to integrated luminosities of 5.0 and 19.7 fb−1 , respectively. The analysis is performed using events with one muon and two or three jets. A Bayesian neural network technique is used to discriminate between the signal and backgrounds, which are observed to be consistent with the standard model prediction. The 95% confidence level (CL) exclusion limits on anomalous right-handed vector, and left- and righthanded tensor Wtb couplings are measured to be |f R V | < 0.16, |f L T | < 0.057, and −0.049 < f R T < 0.048, respectively. For the FCNC couplings κtug and κtcg, the 95% CL upper limits on coupling strengths are |κtug|/Λ < 4.1 × 10−3 TeV−1 and |κtcg|/Λ < 1.8 × 10−2 TeV−1 , where Λ is the scale for new physics, and correspond to upper limits on the branching fractions of 2.0 × 10−5 and 4.1 × 10−4 for the decays t → ug and t → cg, respectively. Springer Nature 2017-02-01 Article PeerReviewed application/pdf en http://irep.iium.edu.my/63059/1/63059_Search%20for%20anomalous%20Wtb%20couplings%20_article.pdf application/pdf en http://irep.iium.edu.my/63059/2/63059_Search%20for%20anomalous%20Wtb%20couplings%20_scopus.pdf Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Asilar, Ece and Md. Ali, Mohd. Adli (2017) Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at √s=7 and 8 TeV. Journal of High Energy Physics, 2017 (2). pp. 1-44. ISSN 1029-8479 https://link.springer.com/content/pdf/10.1007%2FJHEP02%282017%29028.pdf 10.1007/JHEP02(2017)028
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
language English
English
topic Q Science (General)
QC Physics
spellingShingle Q Science (General)
QC Physics
Khachatryan, V.
Sirunyan, A. M.
Tumasyan, A. R.
Adam, Wolfgang
Asilar, Ece
Md. Ali, Mohd. Adli
Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at √s=7 and 8 TeV
description Single top quark events produced in the t channel are used to set limits on anomalous Wtb couplings and to search for top quark flavour-changing neutral current (FCNC) interactions. The data taken with the CMS detector at the LHC in proton-proton collisions at √ s = 7 and 8 TeV correspond to integrated luminosities of 5.0 and 19.7 fb−1 , respectively. The analysis is performed using events with one muon and two or three jets. A Bayesian neural network technique is used to discriminate between the signal and backgrounds, which are observed to be consistent with the standard model prediction. The 95% confidence level (CL) exclusion limits on anomalous right-handed vector, and left- and righthanded tensor Wtb couplings are measured to be |f R V | < 0.16, |f L T | < 0.057, and −0.049 < f R T < 0.048, respectively. For the FCNC couplings κtug and κtcg, the 95% CL upper limits on coupling strengths are |κtug|/Λ < 4.1 × 10−3 TeV−1 and |κtcg|/Λ < 1.8 × 10−2 TeV−1 , where Λ is the scale for new physics, and correspond to upper limits on the branching fractions of 2.0 × 10−5 and 4.1 × 10−4 for the decays t → ug and t → cg, respectively.
format Article
author Khachatryan, V.
Sirunyan, A. M.
Tumasyan, A. R.
Adam, Wolfgang
Asilar, Ece
Md. Ali, Mohd. Adli
author_facet Khachatryan, V.
Sirunyan, A. M.
Tumasyan, A. R.
Adam, Wolfgang
Asilar, Ece
Md. Ali, Mohd. Adli
author_sort Khachatryan, V.
title Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at √s=7 and 8 TeV
title_short Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at √s=7 and 8 TeV
title_full Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at √s=7 and 8 TeV
title_fullStr Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at √s=7 and 8 TeV
title_full_unstemmed Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at √s=7 and 8 TeV
title_sort search for anomalous wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at √s=7 and 8 tev
publisher Springer Nature
publishDate 2017
url http://irep.iium.edu.my/63059/1/63059_Search%20for%20anomalous%20Wtb%20couplings%20_article.pdf
http://irep.iium.edu.my/63059/2/63059_Search%20for%20anomalous%20Wtb%20couplings%20_scopus.pdf
http://irep.iium.edu.my/63059/
https://link.springer.com/content/pdf/10.1007%2FJHEP02%282017%29028.pdf
_version_ 1643618439347044352
score 13.211869

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