Survey of top quark polarization at a polarized lineare+e−collider
نویسندگان
چکیده
منابع مشابه
Top Quark Physics at a Polarized
Top quark pair production is presented at a polarized Muon Collider above the threshold region. The off-diagonal spin basis is the natural basis for this discussion as the top quark pairs are produced in an essentially unique spin configuration for 100% polarization. Modest polarization, say 30%, can lead to 90% of all top quark pair events being in one spin configuration. This will lead to sen...
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The energy spectrum of the lepton(s) in e+e−→ tt̄ → `± · · · /`+`− · · · at next linear colliders (NLC) is studied for arbitrary longitudinal beam polarizations as a test of possible new physics in top-quark couplings. The most general non-standard form factors are assumed for γtt̄, Ztt̄ and Wtb vertices to analyze new-physics effects in a model-independent way. Expected precision in determining t...
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We derive a simple analytic expression for q ¯ q, gg → t ¯ t → bW + ¯ bW − → b ¯ lν l ¯ bl ′ ¯ ν l ′ for on shell intermediate states with the interference effects due to the polarizations of the t and ¯ t. We then investigate how this effect may be measured at Tevatron or other hadronic colliders.
متن کاملTHE ROLE OF QUARK POLARIZATION IN HEAVY QUARK FRAGMENTATION
We calculate the exact fragmentation functions for c and b quark fragmentation taking into account the spin orientation of the initial heavy quark in the form of analytical and rather simple expressions. Our calculations show that spin orientation may have an important effect on the fragmentation spectrum. This effect is more striking in the cases of c ?D, D*; c? ? , ? , and ?B , B *.
متن کاملLongitudinal quark polarization in transversely polarized nucleons.
Intrinsic transverse momentum (kT) plays an important role in the quark distribution functions ~DF’s! used to describe a polarized nucleon @1,2#. For the leading ~twist-two! part of the deep inelastic scattering cross section one already needs six DF’s to describe the quark state in a polarized nucleon. They depend on x and kT 2 , which parametrize the quark momentum in a nucleon with momentum ...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2011
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.83.054018