Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-04-20
JHEP 0301 (2003) 062
Physics
High Energy Physics
High Energy Physics - Phenomenology
Published version, one reference added, minor corrections and clarifications
Scientific paper
10.1088/1126-6708/2003/01/062
We consider the production process e-e+ -> G\gamma of invisible gravitons (G) at future linear colliders. We discuss whether the angular distribution of the photon (\gamma) can be used to measure the spin of the invisible graviton, or of any other invisible objects produced. We propose a method based on the Fourier expansion of the transverse energy squared moment distribution of the photon. We provide justification for this method, and confirm, especially for the case of two extra dimensions, that the method is valid within a realistic setup, which includes the simulation of the Standard Model background, beamstrahlung, bremsstrahlung, calorimeter resolution and calorimeter coverage. When the number of extra dimensions is increased, the angular distribution does not provide sufficient information to extract the spin, but this method still offers a useful parameterization of the single photon cross section using which the nature of the missing object can be studied.
Asakawa Eri
Odagiri Kosuke
Uehara Yosuke
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