Search for $s$-channel single top-quark production in proton–proton collisions at $\sqrt s=8$ TeV with the ATLAS detector

Philip James Clark; Christos Leonidopoulos; Victoria Jane Martin; Corrinne Mills; Atlas Collaboration

doi:10.1016/j.physletb.2014.11.042

Search for $s$-channel single top-quark production in proton–proton collisions at $\sqrt s=8$ TeV with the ATLAS detector

Philip James Clark, Christos Leonidopoulos, Victoria Jane Martin, Corrinne Mills, Atlas Collaboration

School of Physics and Astronomy

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Abstract

This Letter presents a search at the LHC for s-channel single top-quark production in proton-proton collisions at a centre-of-mass energy of 8 TeV. The analyzed data set was recorded by the ATLAS detector and corresponds to an integrated luminosity of 20.3 fb$^{-1}$. Selected events contain one charged lepton, large missing transverse momentum and exactly two b-tagged jets. A multivariate event classifier based on boosted decision trees is developed to discriminate s-channel single top-quark events from the main background contributions. The signal extraction is based on a binned maximum-likelihood fit of the output classifier distribution. The analysis leads to an upper limit on the s-channel single top-quark production cross-section of 14.6 pb at the 95% confidence level. The fit gives a cross-section of $\sigma_s$=5.0$\pm$4.3 pb, consistent with the Standard Model expectation.

Original language	English
Article number	Aad:2014aia
Pages (from-to)	118-136
Journal	Physics Letters B
Volume	B740
DOIs	https://doi.org/10.1016/j.physletb.2014.11.042
Publication status	Published - 19 Nov 2014

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@article{dee909cddd99439ab00f83279a3b16e9,

title = "Search for $s$-channel single top-quark production in proton–proton collisions at $\sqrt s=8$ TeV with the ATLAS detector",

abstract = "This Letter presents a search at the LHC for s-channel single top-quark production in proton-proton collisions at a centre-of-mass energy of 8 TeV. The analyzed data set was recorded by the ATLAS detector and corresponds to an integrated luminosity of 20.3 fb$^{-1}$. Selected events contain one charged lepton, large missing transverse momentum and exactly two b-tagged jets. A multivariate event classifier based on boosted decision trees is developed to discriminate s-channel single top-quark events from the main background contributions. The signal extraction is based on a binned maximum-likelihood fit of the output classifier distribution. The analysis leads to an upper limit on the s-channel single top-quark production cross-section of 14.6 pb at the 95% confidence level. The fit gives a cross-section of $\sigma_s$=5.0$\pm$4.3 pb, consistent with the Standard Model expectation.",

author = "Clark, {Philip James} and Christos Leonidopoulos and Martin, {Victoria Jane} and Corrinne Mills and Atlas Collaboration",

year = "2014",

month = nov,

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doi = "10.1016/j.physletb.2014.11.042",

language = "English",

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journal = "Physics Letters B",

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TY - JOUR

T1 - Search for $s$-channel single top-quark production in proton–proton collisions at $\sqrt s=8$ TeV with the ATLAS detector

AU - Clark, Philip James

AU - Leonidopoulos, Christos

AU - Martin, Victoria Jane

AU - Mills, Corrinne

AU - Collaboration, Atlas

PY - 2014/11/19

Y1 - 2014/11/19

N2 - This Letter presents a search at the LHC for s-channel single top-quark production in proton-proton collisions at a centre-of-mass energy of 8 TeV. The analyzed data set was recorded by the ATLAS detector and corresponds to an integrated luminosity of 20.3 fb$^{-1}$. Selected events contain one charged lepton, large missing transverse momentum and exactly two b-tagged jets. A multivariate event classifier based on boosted decision trees is developed to discriminate s-channel single top-quark events from the main background contributions. The signal extraction is based on a binned maximum-likelihood fit of the output classifier distribution. The analysis leads to an upper limit on the s-channel single top-quark production cross-section of 14.6 pb at the 95% confidence level. The fit gives a cross-section of $\sigma_s$=5.0$\pm$4.3 pb, consistent with the Standard Model expectation.

AB - This Letter presents a search at the LHC for s-channel single top-quark production in proton-proton collisions at a centre-of-mass energy of 8 TeV. The analyzed data set was recorded by the ATLAS detector and corresponds to an integrated luminosity of 20.3 fb$^{-1}$. Selected events contain one charged lepton, large missing transverse momentum and exactly two b-tagged jets. A multivariate event classifier based on boosted decision trees is developed to discriminate s-channel single top-quark events from the main background contributions. The signal extraction is based on a binned maximum-likelihood fit of the output classifier distribution. The analysis leads to an upper limit on the s-channel single top-quark production cross-section of 14.6 pb at the 95% confidence level. The fit gives a cross-section of $\sigma_s$=5.0$\pm$4.3 pb, consistent with the Standard Model expectation.

U2 - 10.1016/j.physletb.2014.11.042

DO - 10.1016/j.physletb.2014.11.042

M3 - Article

SN - 1873-2445

VL - B740

SP - 118

EP - 136

JO - Physics Letters B

JF - Physics Letters B

M1 - Aad:2014aia

ER -

Search for $s$-channel single top-quark production in proton–proton collisions at $\sqrt s=8$ TeV with the ATLAS detector

Abstract

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