Unique Graviton Exchange Signatures at Linear Colliders
نویسنده
چکیده
Many types of new physics can lead to contact interaction-like modifications in e+e− processes below direct production threshold. We examine the possibility of uniquely identifying the effects of graviton exchange from amongst this large set of models by using the moments of the angular distribution of the final state particles. In the case of e+e− → ff̄(W+W−) we demonstrate that this technique allows for the unique identification of the graviton exchange signature at the 5σ level for mass scales as high as 6(2.5) √ s.
منابع مشابه
More Transverse Polarization Signatures of Extra Dimensions at Linear Colliders
Polarization of both electron and positron beams at a future linear collider (LC) allows for the measurement of transverse polarization asymmetries. These asymmetries have been shown to be particularly sensitive to graviton or other spin-2, s−channel exchanges in the process e+e− → f f̄ (f = e) which allows for a doubling of the usual search reach. A question then arises as to whether other e+e−...
متن کاملUsing Scalars to Probe Theories of Low Scale Quantum Gravity
Arkani-Hamed, Dimopoulos and Dvali have recently suggested that gravity may become strong at energies near 1 TeV which would remove the hierarchy problem. Such a scenario can be tested at present and future colliders since the exchange of towers of Kaluza-Klein gravitons leads to a set of new dimension-8 operators that can play important phenomenological roles. In this paper we examine how the ...
متن کاملThe effects of large extra dimensions on associated tt̄h 0 production at linear colliders ∗
In the framework of the large extra dimensions (LED) model, the effects of LED on the processes γγ → tt̄h0 and e+e− → tt̄h0 at future linear colliders are investigated in both polarized and unpolarized collision modes. The results show that the virtual Kaluza-Klein (KK) graviton exchange can significantly modify the standard model expectations for these processes with certain polarizations of ini...
متن کاملAMES-HET 99-06 UCRHEP-T258 BNL-HET-99/13 Gauge Boson – Gauge Boson Scattering in Theories with Large Extra Dimensions
We consider the scattering amplitudes of the form V1V2 → V3V4, where Vi = γ, Z, W or g(=gluon) are the Standard Model gauge bosons, due to graviton exchange in Kaluza-Klein theories with large extra dimensions. This leads to a number of experimentally viable signatures at high energy leptonic and hadronic colliders. We discuss the observability or attainable limits on the scale of the gravitati...
متن کاملGauge Boson – Gauge Boson Scattering in Theories with Large Extra Dimensions
We consider the scattering amplitudes of the form V1V2 → V3V4, where Vi = γ, Z, W or g(=gluon) are the Standard Model gauge bosons, due to graviton exchange in Kaluza-Klein theories with large extra dimensions. This leads to a number of experimentally viable signatures at high energy leptonic and hadronic colliders. We discuss the observability or future limits on the scale of the gravitational...
متن کامل