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...
Saved in:
Main Authors: | , , , , , |
---|---|
Format: | Article |
Language: | English English |
Published: |
Springer Nature
2017
|
Subjects: | |
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 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
my.iium.irep.63059 |
---|---|
record_format |
dspace |
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 |
13.18916 |