Evidence for single top-quark production in the s-channel in proton-proton collisions at s=8 TeV with the ATLAS detector using the Matrix Element Method

G. Aad; B. Abbott; J. Abdallah; O. Abdinov; R. Aben; M. Abolins; O. S. AbouZeid; H. Abramowicz; H. Abreu; R. Abreu; Y. Abulaiti; B. S. Acharya; L. Adamczyk; D. L. Adams; J. Adelman; S. Adomeit; T. Adye; A. A. Affolder; T. Agatonovic-Jovin; J. Agricola; J. A. Aguilar-Saavedra; S. P. Ahlen; F. Ahmadov; G. Aielli; H. Akerstedt; T. P.A. Åkesson; A. V. Akimov; G. L. Alberghi; J. Albert; S. Albrand; M. J. Alconada Verzini; M. Aleksa; I. N. Aleksandrov; C. Alexa; G. Alexander; T. Alexopoulos; M. Alhroob; G. Alimonti; L. Alio; J. Alison; S. P. Alkire; B. M.M. Allbrooke; P. P. Allport; A. Aloisio; A. Alonso; F. Alonso; K. Kawagoe; S. Oda; H. Otono; J. Tojo; ATLAS Collaboration

doi:10.1016/j.physletb.2016.03.017

Evidence for single top-quark production in the s-channel in proton-proton collisions at s=8 TeV with the ATLAS detector using the Matrix Element Method

G. Aad, B. Abbott, J. Abdallah, O. Abdinov, R. Aben, M. Abolins, O. S. AbouZeid, H. Abramowicz, H. Abreu, R. Abreu, Y. Abulaiti, B. S. Acharya, L. Adamczyk, D. L. Adams, J. Adelman, S. Adomeit, T. Adye, A. A. Affolder, T. Agatonovic-Jovin, J. AgricolaJ. A. Aguilar-Saavedra, S. P. Ahlen, F. Ahmadov, G. Aielli, H. Akerstedt, T. P.A. Åkesson, A. V. Akimov, G. L. Alberghi, J. Albert, S. Albrand, M. J. Alconada Verzini, M. Aleksa, I. N. Aleksandrov, C. Alexa, G. Alexander, T. Alexopoulos, M. Alhroob, G. Alimonti, L. Alio, J. Alison, S. P. Alkire, B. M.M. Allbrooke, P. P. Allport, A. Aloisio, A. Alonso, F. Alonso, K. Kawagoe, S. Oda, H. Otono, J. Tojo, ATLAS Collaboration

Research output: Contribution to journal › Article › peer-review

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Abstract

This Letter presents evidence for single top-quark production in the s-channel using proton-proton collisions at a centre-of-mass energy of 8 TeV with the ATLAS detector at the CERN Large Hadron Collider. The analysis is performed on events containing one isolated electron or muon, large missing transverse momentum and exactly two b-tagged jets in the final state. The analysed data set corresponds to an integrated luminosity of 20.3 fb^-1. The signal is extracted using a maximum-likelihood fit of a discriminant which is based on the matrix element method and optimized in order to separate single-top-quark s-channel events from the main background contributions, which are top-quark pair production and W boson production in association with heavy-flavour jets. The measurement leads to an observed signal significance of 3.2 standard deviations and a measured cross-section of σs=4.8±0.8(stat.)-1.3+1.6(syst.) pb, which is consistent with the Standard Model expectation. The expected significance for the analysis is 3.9 standard deviations.

Original language	English
Pages (from-to)	228-246
Number of pages	19
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	756
DOIs	https://doi.org/10.1016/j.physletb.2016.03.017
Publication status	Published - May 10 2016

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1016/j.physletb.2016.03.017

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Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., Abolins, M., AbouZeid, O. S., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B. S., Adamczyk, L., Adams, D. L., Adelman, J., Adomeit, S., Adye, T., Affolder, A. A., Agatonovic-Jovin, T., ... ATLAS Collaboration (2016). Evidence for single top-quark production in the s-channel in proton-proton collisions at s=8 TeV with the ATLAS detector using the Matrix Element Method. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 756, 228-246. https://doi.org/10.1016/j.physletb.2016.03.017

Evidence for single top-quark production in the s-channel in proton-proton collisions at s=8 TeV with the ATLAS detector using the Matrix Element Method. / Aad, G.; Abbott, B.; Abdallah, J. et al.
In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 756, 10.05.2016, p. 228-246.

Research output: Contribution to journal › Article › peer-review

Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Aben, R, Abolins, M, AbouZeid, OS, Abramowicz, H, Abreu, H, Abreu, R, Abulaiti, Y, Acharya, BS, Adamczyk, L, Adams, DL, Adelman, J, Adomeit, S, Adye, T, Affolder, AA, Agatonovic-Jovin, T, Agricola, J, Aguilar-Saavedra, JA, Ahlen, SP, Ahmadov, F, Aielli, G, Akerstedt, H, Åkesson, TPA, Akimov, AV, Alberghi, GL, Albert, J, Albrand, S, Alconada Verzini, MJ, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexander, G, Alexopoulos, T, Alhroob, M, Alimonti, G, Alio, L, Alison, J, Alkire, SP, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, A, Alonso, F, Kawagoe, K, Oda, S, Otono, H , Tojo, J & ATLAS Collaboration 2016, 'Evidence for single top-quark production in the s-channel in proton-proton collisions at s=8 TeV with the ATLAS detector using the Matrix Element Method', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 756, pp. 228-246. https://doi.org/10.1016/j.physletb.2016.03.017

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title = "Evidence for single top-quark production in the s-channel in proton-proton collisions at s=8 TeV with the ATLAS detector using the Matrix Element Method",

abstract = "This Letter presents evidence for single top-quark production in the s-channel using proton-proton collisions at a centre-of-mass energy of 8 TeV with the ATLAS detector at the CERN Large Hadron Collider. The analysis is performed on events containing one isolated electron or muon, large missing transverse momentum and exactly two b-tagged jets in the final state. The analysed data set corresponds to an integrated luminosity of 20.3 fb-1. The signal is extracted using a maximum-likelihood fit of a discriminant which is based on the matrix element method and optimized in order to separate single-top-quark s-channel events from the main background contributions, which are top-quark pair production and W boson production in association with heavy-flavour jets. The measurement leads to an observed signal significance of 3.2 standard deviations and a measured cross-section of σs=4.8±0.8(stat.)-1.3+1.6(syst.) pb, which is consistent with the Standard Model expectation. The expected significance for the analysis is 3.9 standard deviations.",

author = "G. Aad and B. Abbott and J. Abdallah and O. Abdinov and R. Aben and M. Abolins and AbouZeid, {O. S.} and H. Abramowicz and H. Abreu and R. Abreu and Y. Abulaiti and Acharya, {B. S.} and L. Adamczyk and Adams, {D. L.} and J. Adelman and S. Adomeit and T. Adye and Affolder, {A. A.} and T. Agatonovic-Jovin and J. Agricola and Aguilar-Saavedra, {J. A.} and Ahlen, {S. P.} and F. Ahmadov and G. Aielli and H. Akerstedt and {\AA}kesson, {T. P.A.} and Akimov, {A. V.} and Alberghi, {G. L.} and J. Albert and S. Albrand and {Alconada Verzini}, {M. J.} and M. Aleksa and Aleksandrov, {I. N.} and C. Alexa and G. Alexander and T. Alexopoulos and M. Alhroob and G. Alimonti and L. Alio and J. Alison and Alkire, {S. P.} and Allbrooke, {B. M.M.} and Allport, {P. P.} and A. Aloisio and A. Alonso and F. Alonso and K. Kawagoe and S. Oda and H. Otono and J. Tojo and {ATLAS Collaboration}",

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doi = "10.1016/j.physletb.2016.03.017",

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TY - JOUR

T1 - Evidence for single top-quark production in the s-channel in proton-proton collisions at s=8 TeV with the ATLAS detector using the Matrix Element Method

AU - Aad, G.

AU - Abbott, B.

AU - Abdallah, J.

AU - Abdinov, O.

AU - Aben, R.

AU - Abolins, M.

AU - AbouZeid, O. S.

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abreu, R.

AU - Abulaiti, Y.

AU - Acharya, B. S.

AU - Adamczyk, L.

AU - Adams, D. L.

AU - Adelman, J.

AU - Adomeit, S.

AU - Adye, T.

AU - Affolder, A. A.

AU - Agatonovic-Jovin, T.

AU - Agricola, J.

AU - Aguilar-Saavedra, J. A.

AU - Ahlen, S. P.

AU - Ahmadov, F.

AU - Aielli, G.

AU - Akerstedt, H.

AU - Åkesson, T. P.A.

AU - Akimov, A. V.

AU - Alberghi, G. L.

AU - Albert, J.

AU - Albrand, S.

AU - Alconada Verzini, M. J.

AU - Aleksa, M.

AU - Aleksandrov, I. N.

AU - Alexa, C.

AU - Alexander, G.

AU - Alexopoulos, T.

AU - Alhroob, M.

AU - Alimonti, G.

AU - Alio, L.

AU - Alison, J.

AU - Alkire, S. P.

AU - Allbrooke, B. M.M.

AU - Allport, P. P.

AU - Aloisio, A.

AU - Alonso, A.

AU - Alonso, F.

AU - Kawagoe, K.

AU - Oda, S.

AU - Otono, H.

AU - Tojo, J.

AU - ATLAS Collaboration

PY - 2016/5/10

Y1 - 2016/5/10

N2 - This Letter presents evidence for single top-quark production in the s-channel using proton-proton collisions at a centre-of-mass energy of 8 TeV with the ATLAS detector at the CERN Large Hadron Collider. The analysis is performed on events containing one isolated electron or muon, large missing transverse momentum and exactly two b-tagged jets in the final state. The analysed data set corresponds to an integrated luminosity of 20.3 fb-1. The signal is extracted using a maximum-likelihood fit of a discriminant which is based on the matrix element method and optimized in order to separate single-top-quark s-channel events from the main background contributions, which are top-quark pair production and W boson production in association with heavy-flavour jets. The measurement leads to an observed signal significance of 3.2 standard deviations and a measured cross-section of σs=4.8±0.8(stat.)-1.3+1.6(syst.) pb, which is consistent with the Standard Model expectation. The expected significance for the analysis is 3.9 standard deviations.

AB - This Letter presents evidence for single top-quark production in the s-channel using proton-proton collisions at a centre-of-mass energy of 8 TeV with the ATLAS detector at the CERN Large Hadron Collider. The analysis is performed on events containing one isolated electron or muon, large missing transverse momentum and exactly two b-tagged jets in the final state. The analysed data set corresponds to an integrated luminosity of 20.3 fb-1. The signal is extracted using a maximum-likelihood fit of a discriminant which is based on the matrix element method and optimized in order to separate single-top-quark s-channel events from the main background contributions, which are top-quark pair production and W boson production in association with heavy-flavour jets. The measurement leads to an observed signal significance of 3.2 standard deviations and a measured cross-section of σs=4.8±0.8(stat.)-1.3+1.6(syst.) pb, which is consistent with the Standard Model expectation. The expected significance for the analysis is 3.9 standard deviations.

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U2 - 10.1016/j.physletb.2016.03.017

DO - 10.1016/j.physletb.2016.03.017

M3 - Article

SN - 0370-2693

VL - 756

SP - 228

EP - 246

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

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

ER -

Evidence for single top-quark production in the s-channel in proton-proton collisions at s=8 TeV with the ATLAS detector using the Matrix Element Method

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