Measurement of top quark polarization in top-antitop events from proton-proton collisions at √s=7  TeV using the ATLAS detector.

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ID: 77929
2013
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Abstract
This Letter presents measurements of the polarization of the top quark in top-antitop quark pair events, using 4.7  fb(-1) of proton-proton collision data recorded with the ATLAS detector at the Large Hadron Collider at √s=7  TeV. Final states containing one or two isolated leptons (electrons or muons) and jets are considered. Two measurements of α(ℓ)P, the product of the leptonic spin-analyzing power and the top quark polarization, are performed assuming that the polarization is introduced by either a CP conserving or a maximally CP violating production process. The measurements obtained, α(ℓ)P(CPC)=-0.035±0.014(stat)±0.037(syst) and α(ℓ)P(CPV)=0.020±0.016(stat)(-0.017)(+0.013)(syst), are in good agreement with the standard model prediction of negligible top quark polarization.
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Authors G Aad, T Abajyan, B Abbott, J Abdallah, S Abdel Khalek, O Abdinov, R Aben, B Abi, M Abolins, O S AbouZeid, H Abramowicz, H Abreu, Y Abulaiti, B S Acharya, L Adamczyk, D L Adams, T N Addy, J Adelman, S Adomeit, T Adye, S Aefsky, T Agatonovic-Jovin, J A Aguilar-Saavedra, M Agustoni, S P Ahlen, A Ahmad, M Ahsan, G Aielli, T P A Åkesson, G Akimoto, A V Akimov, M A Alam, J Albert, S Albrand, M J Alconada Verzini, M Aleksa, I N Aleksandrov, F Alessandria, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, M Aliev, G Alimonti, L Alio, J Alison, B M M Allbrooke, L J Allison, P P Allport, S E Allwood-Spiers, J Almond, A Aloisio, R Alon, A Alonso, F Alonso, A Altheimer, B Alvarez Gonzalez, M G Alviggi, K Amako, Y Amaral Coutinho, C Amelung, V V Ammosov, S P Amor Dos Santos, A Amorim, S Amoroso, N Amram, C Anastopoulos, L S Ancu, N Andari, T Andeen, C F Anders, G Anders, K J Anderson, A Andreazza, V Andrei, X S Anduaga, S Angelidakis, P Anger, A Angerami, F Anghinolfi, A V Anisenkov, N Anjos, A Annovi, A Antonaki, M Antonelli, A Antonov, J Antos, F Anulli, M Aoki, L Aperio Bella, R Apolle, G Arabidze, I Aracena, Y Arai, A T H Arce, S Arfaoui, J-F Arguin, S Argyropoulos, E Arik
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Journal physical review letters
Year 2013
DOI
DOI not found
URL URL not found
Keywords
Atlas fully hadronic lhc proton–proton collisions top quark top-quark mass

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