- Main
Measurement of the production cross-section of a single top quark in association with a W boson at 8 TeV with the ATLAS experiment
- Author(s): The ATLAS collaboration
- 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
- Alpigiani, C
- Altheimer, A
- Alvarez Gonzalez, B
- Álvarez Piqueras, D
- Alviggi, MG
- Amadio, BT
- Amako, K
- Amaral Coutinho, Y
- Amelung, C
- Amidei, D
- Amor Dos Santos, SP
- Amorim, A
- Amoroso, S
- Amram, N
- Amundsen, G
- Anastopoulos, C
- Ancu, LS
- Andari, N
- Andeen, T
- Anders, CF
- Anders, G
- Anders, JK
- Anderson, KJ
- Andreazza, A
- Andrei, V
- Angelidakis, S
- Angelozzi, I
- Anger, P
- Angerami, A
- Anghinolfi, F
- Anisenkov, AV
- Anjos, N
- Annovi, A
- Antonelli, M
- Antonov, A
- Antos, J
- Anulli, F
- Aoki, M
- Aperio Bella, L
- Arabidze, G
- Arai, Y
- Araque, JP
- Arce, ATH
- Arduh, FA
- Arguin, JF
- Argyropoulos, S
- Arik, M
- Armbruster, AJ
- Arnaez, O
- Arnold, H
- Arratia, M
- Arslan, O
- Artamonov, A
- et al.
Abstract
The cross-section for the production of a single top quark in association with a W boson in proton-proton collisions at √s = 8TeV is measured. The dataset corresponds to an integrated luminosity of 20.3 fb , collected by the ATLAS detector in 2012 at the Large Hadron Collider at CERN. Events containing two leptons and one central b-jet are selected. The W t signal is separated from the backgrounds using boosted decision trees, each of which combines a number of discriminating variables into one classifier. Production of W t events is observed with a significance of 7.7σ. The cross-section is extracted in a profile likelihood fit to the classifier output distributions. The W t cross-section, inclusive of decay modes, is measured to be 23.0 ± 1.3(stat.) (syst.)±1.1(lumi.) pb. The measured cross-section is used to extract a value for the CKM matrix element |V | of 1.01 ± 0.10 and a lower limit of 0.80 at the 95% confidence level. The cross-section for the production of a top quark and a W boson is also measured in a fiducial acceptance requiring two leptons with p > 25 GeV and |η| < 2.5, one jet with p > 20 GeV and |η| < 2.5, and E > 20 GeV, including both W t and top-quark pair events as signal. The measured value of the fiducial cross-section is 0.85 ± 0.01(stat.) (syst.)±0.03(lumi.) pb. −1 + 3.2 miss + 0.07 − 3.5 tb T T T − 0.07
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