Measurement of the t-channel single top-quark production cross section in pp collisions at s=7 TeV with the ATLAS detector

ATLAS Collaboration

doi:10.1016/j.physletb.2012.09.031

Measurement of the t-channel single top-quark production cross section in pp collisions at s=7 TeV with the ATLAS detector

ATLAS Collaboration

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Azerbaijan National Academy of Sciences
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AGH University of Krakow
United States Department of Energy
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Ludwig Maximilian University of Munich
Queen Mary University of London
Rutherford Appleton Laboratory
Brandeis University
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Johannes Gutenberg University Mainz
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Laboratoire de Physique Subatomique et de Cosmologie de Grenoble
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University of Pennsylvania
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Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
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Research output: Contribution to journal › Article › peer-review

132 Scopus citations

Abstract

We report a measurement of the cross section of single top-quark production in the t-channel using 1.04 fb⁻¹ of pp collision data at s=7 TeV recorded with the ATLAS detector at the LHC. Selected events feature one electron or muon, missing transverse momentum, and two or three jets, exactly one of them identified as originating from a b quark. The cross section is measured by fitting the distribution of a multivariate discriminant constructed with a neural network, yielding σ_t=83±4(stat.)₋₁₉ ⁺²⁰(syst.) pb, which is in good agreement with the prediction of the Standard Model. Using the ratio of the measured to the theoretically predicted cross section and assuming that the top-quark-related CKM matrix elements obey the relation |V_tb|≫|V_ts|,|V_td|, the coupling strength at the W-t-b vertex is determined to be |V_tb|=1.13_−0.13 ^+0.14. If it is assumed that |V_tb|⩽1 a lower limit of |V_tb|>0.75 is obtained at the 95% confidence level.

Original language	English
Pages (from-to)	330-350
Number of pages	21
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	717
Issue number	4-5
DOIs	https://doi.org/10.1016/j.physletb.2012.09.031
State	Published - 31 Oct 2012
Externally published	Yes

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10.1016/j.physletb.2012.09.031

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@article{54736c21789d49b3b940c5f589fe3601,

title = "Measurement of the t-channel single top-quark production cross section in pp collisions at s=7 TeV with the ATLAS detector",

abstract = "We report a measurement of the cross section of single top-quark production in the t-channel using 1.04 fb−1 of pp collision data at s=7 TeV recorded with the ATLAS detector at the LHC. Selected events feature one electron or muon, missing transverse momentum, and two or three jets, exactly one of them identified as originating from a b quark. The cross section is measured by fitting the distribution of a multivariate discriminant constructed with a neural network, yielding σt=83±4(stat.)−19 +20(syst.) pb, which is in good agreement with the prediction of the Standard Model. Using the ratio of the measured to the theoretically predicted cross section and assuming that the top-quark-related CKM matrix elements obey the relation |Vtb|≫|Vts|,|Vtd|, the coupling strength at the W-t-b vertex is determined to be |Vtb|=1.13−0.13 +0.14. If it is assumed that |Vtb|⩽1 a lower limit of |Vtb|>0.75 is obtained at the 95\% confidence level.",

author = "G. Aad and B. Abbott and J. Abdallah and \{Abdel Khalek\}, S. and S. Kabana and \{ATLAS Collaboration\}",

note = "Publisher Copyright: {\textcopyright} 2012 CERN",

year = "2012",

month = oct,

day = "31",

doi = "10.1016/j.physletb.2012.09.031",

language = "English",

volume = "717",

pages = "330--350",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

number = "4-5",

}

TY - JOUR

T1 - Measurement of the t-channel single top-quark production cross section in pp collisions at s=7 TeV with the ATLAS detector

AU - Aad, G.

AU - Abbott, B.

AU - Abdallah, J.

AU - Abdel Khalek, S.

AU - Kabana, S.

AU - ATLAS Collaboration

PY - 2012/10/31

Y1 - 2012/10/31

N2 - We report a measurement of the cross section of single top-quark production in the t-channel using 1.04 fb−1 of pp collision data at s=7 TeV recorded with the ATLAS detector at the LHC. Selected events feature one electron or muon, missing transverse momentum, and two or three jets, exactly one of them identified as originating from a b quark. The cross section is measured by fitting the distribution of a multivariate discriminant constructed with a neural network, yielding σt=83±4(stat.)−19 +20(syst.) pb, which is in good agreement with the prediction of the Standard Model. Using the ratio of the measured to the theoretically predicted cross section and assuming that the top-quark-related CKM matrix elements obey the relation |Vtb|≫|Vts|,|Vtd|, the coupling strength at the W-t-b vertex is determined to be |Vtb|=1.13−0.13 +0.14. If it is assumed that |Vtb|⩽1 a lower limit of |Vtb|>0.75 is obtained at the 95% confidence level.

AB - We report a measurement of the cross section of single top-quark production in the t-channel using 1.04 fb−1 of pp collision data at s=7 TeV recorded with the ATLAS detector at the LHC. Selected events feature one electron or muon, missing transverse momentum, and two or three jets, exactly one of them identified as originating from a b quark. The cross section is measured by fitting the distribution of a multivariate discriminant constructed with a neural network, yielding σt=83±4(stat.)−19 +20(syst.) pb, which is in good agreement with the prediction of the Standard Model. Using the ratio of the measured to the theoretically predicted cross section and assuming that the top-quark-related CKM matrix elements obey the relation |Vtb|≫|Vts|,|Vtd|, the coupling strength at the W-t-b vertex is determined to be |Vtb|=1.13−0.13 +0.14. If it is assumed that |Vtb|⩽1 a lower limit of |Vtb|>0.75 is obtained at the 95% confidence level.

UR - https://www.scopus.com/pages/publications/85041779750

U2 - 10.1016/j.physletb.2012.09.031

DO - 10.1016/j.physletb.2012.09.031

M3 - Article

AN - SCOPUS:85041779750

SN - 0370-2693

VL - 717

SP - 330

EP - 350

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 4-5

ER -

Measurement of the t-channel single top-quark production cross section in pp collisions at s=7 TeV with the ATLAS detector

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