Top quark as a gate to new physics : Z ′ production in top events at an e + e − collider
نویسنده
چکیده
In Randall-Sundrum theories a dark matter candidate can arise consequently to baryon number conservation in the form of a massive right handed Dirac neutrino interacting through an additional SU(2)R gauge group. The neutral SU(2)R gauge boson, called Z ′, is supposed to couple only to the standard model right handed top quark. In ee collisions it will therefore be produced preferentially in top events. Its production is studied in the channel ee → tt̄Z′ and a method to measure its mass is proposed. The generator level measurement shows a precision better than 10% for a light Z′ (mZ′ ∈ [200, 500]GeV).
منابع مشابه
The Constraint on FCNC Coupling of the Top Quark with a Gluon from ep - Collisions
Using the constraint on the single top production cross-section obtained at the HERA collider, σ(ep → e tX), we evaluate an upper limit on coupling constant of the anomalous top quark interaction with a gluon via flavor-changing neutral current: |κtgq/Λ| . 0.4 TeV, BR(t → gq) < 13% E-mail: ashimova [email protected] E-mail: [email protected] Introduction In different extensions of the Standa...
متن کاملScalar Top Quark as the Next-to-Lightest Supersymmetric Particle
We study phenomenologically the scenario in which the scalar top quark is lighter than any other standard supersymmetric partner and also lighter than the top quark, so that it decays to the gravitino via e t ! Wb e G. In this case, scalar top quark events would seem to be very di cult to separate from top quark pair production. However, we show that, even at a hadron collider, it is possible t...
متن کاملTop quark precision physics at the International Linear Collider∗
Top quark production in the process e+e− → tt at a future linear electron positron collider with polarised beams is a powerful tool to determine the scale of new physics. Studies at the tt threshold will allow for precise determination of the top quark mass in a well defined theoretical framework. At higher energies vector, axial vector and tensorial CP conserving couplings can be separately de...
متن کاملProbe of new physics in top-quark pair production at e-e+ colliders.
We describe how to probe new physics through examination of the form factors describing the Z −t − ¯ t couplings via the scattering process e − e + → t ¯ t. We focus on experimental methods on how the top quark momentum can be determined and show how this can be applied to select polarized samples of t ¯ t pairs through the angular correlations in the final state leptons. We also study the depe...
متن کاملReport of the 2005 Snowmass Top / QCD Working Group
p This report discusses several topics in both top quark physics and QCD at an International Linear Collider (ILC). Issues such as measurements at the t ¯ t threshold, including both theoretical and machine requirements, and the determination of electroweak top quark couplings are reviewed. New results concerning the potential of a 500 GeV e + e − collider for measuring W tb couplings and the t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2011