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

G. Aad; Mogens Dam; Jørgen Beck Hansen; Peter Henrik Hansen; John Renner Hansen; Jørn Dines Hansen; Simon Johann Franz Heisterkamp; Nele Maria Philomena Boelaert; Morten Dam Jørgensen; Esben Bryndt Klinkby; Björn Stefan Nilsson; Sascha Mehlhase; Troels Christian Petersen; Ask Emil Løvschall-Jensen; Stefania Xella

doi:10.1016/j.physletb.2012.09.031

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

G. Aad, Mogens Dam, Jørgen Beck Hansen, Peter Henrik Hansen, John Renner Hansen, Jørn Dines Hansen, Simon Johann Franz Heisterkamp, Nele Maria Philomena Boelaert, Morten Dam Jørgensen, Esben Bryndt Klinkby, Björn Stefan Nilsson, Sascha Mehlhase, Troels Christian Petersen, Ask Emil Løvschall-Jensen, Stefania Xella

101 Citationer (Scopus)

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.

Originalsprog	Engelsk
Tidsskrift	Physics Letters B
Vol/bind	717
Udgave nummer	4-5
Sider (fra-til)	330-350
Antal sider	20
ISSN	0370-2693
DOI	https://doi.org/10.1016/j.physletb.2012.09.031
Status	Udgivet - 31 okt. 2012

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10.1016/j.physletb.2012.09.031

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Aad, G., Dam, M., Hansen, J. B., Hansen, P. H., Hansen, J. R., Hansen, J. D., Heisterkamp, S. J. F., Boelaert, N. M. P., Jørgensen, M. D., Klinkby, E. B., Nilsson, B. S., Mehlhase, S., Petersen, T. C., Løvschall-Jensen, A. E., & Xella, S. (2012). Measurement of the t-channel single top-quark production cross section in pp collisions at root s=7 TeV with the ATLAS detector. Physics Letters B, 717(4-5), 330-350. https://doi.org/10.1016/j.physletb.2012.09.031

Aad, G, Dam, M , Hansen, JB , Hansen, PH , Hansen, JR , Hansen, JD, Heisterkamp, SJF, Boelaert, NMP, Jørgensen, MD, Klinkby, EB, Nilsson, BS, Mehlhase, S, Petersen, TC, Løvschall-Jensen, AE & Xella, S 2012, 'Measurement of the t-channel single top-quark production cross section in pp collisions at root s=7 TeV with the ATLAS detector', Physics Letters B, bind 717, nr. 4-5, s. 330-350. https://doi.org/10.1016/j.physletb.2012.09.031

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title = "Measurement of the t-channel single top-quark production cross section in pp collisions at root 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 Mogens Dam and Hansen, {J{\o}rgen Beck} and Hansen, {Peter Henrik} and Hansen, {John Renner} and Hansen, {J{\o}rn Dines} and Heisterkamp, {Simon Johann Franz} and Boelaert, {Nele Maria Philomena} and J{\o}rgensen, {Morten Dam} and Klinkby, {Esben Bryndt} and Nilsson, {Bj{\"o}rn Stefan} and Sascha Mehlhase and Petersen, {Troels Christian} and L{\o}vschall-Jensen, {Ask Emil} and Stefania Xella",

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

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

AU - Aad, G.

AU - Dam, Mogens

AU - Hansen, Jørgen Beck

AU - Hansen, Peter Henrik

AU - Hansen, John Renner

AU - Hansen, Jørn Dines

AU - Heisterkamp, Simon Johann Franz

AU - Boelaert, Nele Maria Philomena

AU - Jørgensen, Morten Dam

AU - Klinkby, Esben Bryndt

AU - Nilsson, Björn Stefan

AU - Mehlhase, Sascha

AU - Petersen, Troels Christian

AU - Løvschall-Jensen, Ask Emil

AU - Xella, Stefania

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.

U2 - 10.1016/j.physletb.2012.09.031

DO - 10.1016/j.physletb.2012.09.031

M3 - Journal article

SN - 0370-2693

VL - 717

SP - 330

EP - 350

JO - Physics Letters B

JF - Physics Letters B

IS - 4-5

ER -

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

Abstract

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