Abstract
We examine whether the ATLAS detector has sensitivity to extra-dimensional scalars (as opposed to components of higher-dimensional tensors which look like 4D scalars), in scenarios having the extra-dimensional Planck scale in the TeV range and n ⩾ 2 non-warped extra dimensions. Such scalars appear as partners of the graviton in virtually all higher dimensional supersymmetric theories. Using the scalar's lowest dimensional effective couplings to quarks and gluons, we compute the rate for the production of a hard jet together with missing energy. We find a non-trivial range of graviscalar couplings to which ATLAS could be sensitive, with experiments being more sensitive to couplings to gluons than to quarks. Graviscalar emission increases the missing-energy signal by adding to graviton production, and so complicates the inference of the extra-dimensional Planck scale from an observed rate. Because graviscalar differential cross-sections resemble those for gravitons, it is unlikely that these can be experimentally distinguished from one another should a missing-energy signal be observed.
Highlights
Since the relevant supersymmetry is extra-dimensional, from the four-dimensional perspective the graviton supermultiplet forms a representation of extended supergravity
In this paper we focus on the properties of the graviscalar, which we take to mean an honest-to-God extra-dimensional scalar which is related to the graviton by supersymmetry. (We do not, for example, mean a 4D scalar which arises as an extra-dimensional component of the metric tensor itself — many of our results will apply to such a particle [10].) Our goal is to identify the relevant couplings of such a scalar, and to use these to explore its experimental implications
We have seen that any determination of the reach of Large Hadron Collider (LHC) must be made relative to a choice for ETm,jinet = Pcut, since this plays a role in the reliability of the entire theoretical calculation
Summary
Since the relevant supersymmetry is extra-dimensional, from the four-dimensional perspective the graviton supermultiplet forms a representation of extended supergravity (i.e. supergravity with more than one supersymmetry generator). (We do not, for example, mean a 4D scalar which arises as an extra-dimensional component of the metric tensor itself — many of our results will apply to such a particle [10].) Our goal is to identify the relevant couplings of such a scalar, and to use these to explore its experimental implications. It compares the predicted production rate both with the expected Standard Model backgrounds, and with previously-calculated graviton emission rates. We would like to know how such particles can couple to higher-dimensional scalars which are related to the graviton by supersymmetry. Since we look for direct experimental signatures in accelerators, we concentrate on trilinear interactions involving a single higher-dimensional scalar and two Standard-Model particles
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