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

Abstract:

This Letter presents measurements of the polarization of the top quark in top-antitop quark pair events, using 4:7 fb–1of 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 αℓP, 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, αℓPCPC=–0.035 ± 0.014(stat) ± 0:037(syst) and αℓPCPV= 0.020 ± 0:016(stat)+0.013–0.017(syst), are in good agreement with the standard model pbkp_rediction of negligible top quark polarization.

Año de publicación:

2013

Keywords:

    Fuente:

    scopusscopus

    Tipo de documento:

    Article

    Estado:

    Acceso abierto

    Áreas de conocimiento:

    • Física de partículas
    • Física

    Áreas temáticas:

    • Física moderna

    Contribuidores:

    Aloisio A.Aloisio A.
    Anders C.F.Anders C.F.
    Antonov A.Antonov A.
    Aielli G.Aielli G.
    Albert J.Albert J.
    Ammosov V.V.Ammosov V.V.
    Allwood-Spiers S.E.Allwood-Spiers S.E.
    Aoki M.Aoki M.
    Andeen T.Andeen T.
    Gonzalez B.A.Gonzalez B.A.
    Almond J.Almond J.
    Abbott B.Abbott B.
    Allbrooke B.M.M.Allbrooke B.M.M.
    Agustoni M.Agustoni M.
    Alhroob M.Alhroob M.
    Alonso A.Alonso A.
    Alviggi M.G.Alviggi M.G.
    Anderson K.J.Anderson K.J.
    Altheimer A.Altheimer A.
    Acharya B.S.Acharya B.S.
    Adomeit S.Adomeit S.
    Alonso F.Alonso F.
    Abajyan T.Abajyan T.
    Adams D.L.Adams D.L.
    Anduaga X.S.Anduaga X.S.
    Amram N.Amram N.
    Aefsky S.Aefsky S.
    Arai Y.Arai Y.
    Alexander G.Alexander G.
    Ahmad A.Ahmad A.
    Allport P.P.Allport P.P.
    Angerami A.Angerami A.
    Alexandre G.Alexandre G.
    Addy T.N.Addy T.N.
    Alexopoulos T.Alexopoulos T.
    Aad G.Aad G.
    Abreu H.Abreu H.
    Ancu L.S.Ancu L.S.
    Arfaoui S.Arfaoui S.
    Alon R.Alon R.
    Andari N.Andari N.
    Anisenkov A.V.Anisenkov A.V.
    Akimov A.V.Akimov A.V.
    Abi B.Abi B.
    Javier GarciaJavier Garcia
    Coutinho Y.A.Coutinho Y.A.
    Arabidze G.Arabidze G.
    Akimoto G.Akimoto G.
    Dos Santos S.P.A.Dos Santos S.P.A.
    Adelman J.Adelman J.
    Bella L.A.Bella L.A.
    Annovi A.Annovi A.
    Apolle R.Apolle R.
    Saavedra J.A.A.Saavedra J.A.A.
    Arce A.T.H.Arce A.T.H.
    Anulli F.Anulli F.
    Abulaiti Y.Abulaiti Y.
    Antonaki A.Antonaki A.
    Arik E.Arik E.
    Adamczyk L.Adamczyk L.
    Abdallah J.Abdallah J.
    Alam M.A.Alam M.A.
    Aracena I.Aracena I.
    Aleksandrov I.N.Aleksandrov I.N.
    Angelidakis S.Angelidakis S.
    Anghinolfi F.Anghinolfi F.
    Anastopoulos C.Anastopoulos C.
    Amoroso S.Amoroso S.
    Allison L.J.Allison L.J.
    Alio L.Alio L.
    Anjos N.Anjos N.
    Agatonovic-Jovin T.Agatonovic-Jovin T.
    Alimonti G.Alimonti G.
    Amelung C.Amelung C.
    Ahsan M.Ahsan M.
    Verzini M.J.A.Verzini M.J.A.
    Abdinov O.Abdinov O.
    Ahlen S.P.Ahlen S.P.
    Andrei V.Andrei V.
    Antonelli M.Antonelli M.
    Antos J.Antos J.
    Aliev M.Aliev M.
    Abou-Zeid O.S.Abou-Zeid O.S.
    Argyropoulos S.Argyropoulos S.
    Adye T.Adye T.
    Aben R.Aben R.
    Abolins M.Abolins M.
    Alexa C.Alexa C.
    Arguin J.F.Arguin J.F.
    Khalek S.A.Khalek S.A.
    Alessandria F.Alessandria F.
    Alison J.Alison J.
    Åkesson T.P.A.Åkesson T.P.A.
    Anders G.Anders G.
    Anger P.Anger P.
    Abramowicz H.Abramowicz H.
    Amorim A.Amorim A.
    Amako K.Amako K.
    Albrand S.Albrand S.
    Andreazza A.Andreazza A.
    Aleksa M.Aleksa M.