کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8187942 1528834 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Top quark spin correlations and polarization at the LHC: Standard model predictions and effects of anomalous top chromo moments
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
Top quark spin correlations and polarization at the LHC: Standard model predictions and effects of anomalous top chromo moments
چکیده انگلیسی
A number of top-spin observables are computed within the Standard Model (SM), at next-to-leading order in the strong and weak gauge couplings for hadronic top-quark anti-quark (tt¯) production and decay at the LHC for center-of-mass energies 7 and 8 TeV. For dileptonic final states we consider the azimuthal angle correlation, the helicity correlation, and the opening angle distribution; for lepton plus jets final states we determine distributions and asymmetries that trace a longitudinal and transverse polarization, respectively, of the t and t¯ samples. The QCD-induced transverse polarization of the top quarks leads to an asymmetry of about 8% that should be detectable with existing data. In addition, we investigate the effects of a non-zero chromo-magnetic and chromo-electric dipole moment of the top quark on these and other top-spin observables and associated asymmetries. These observables allow to disentangle the contributions from the real and imaginary parts of these moments.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 725, Issues 1–3, 9 August 2013, Pages 115-122
نویسندگان
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