Abstract
Mass variable \sqrt{\hat{S}_{min}} and its variants were constructed by minimising the parton level center of mass energy that is consistent with all inclusive measurements. They were proposed to have the ability to measure mass scale of new physics in a fully model independent way. In this work we relax the criteria by assuming the availability of partial informations of new physics events and thus constraining this mass variable even further. Starting with two different classes of production topology, i.e. antler and non-antler, we demonstrate the usefulness of these variables to constrain the unknown masses. This discussion is illustrated with different examples, from the standard model Higgs production and beyond standard model resonance productions leading to semi-invisible production. We also utilise these constrains to reconstruct the semi-invisible events with the momenta of invisible particles and thus improving the measurements to reveal the properties of new physics.
Highlights
JHEP03(2015)142 their presence is the observation of sizable PT in the detector calculated from the imbalance of transverse visible momenta produced in such events
We utilise these constrains to reconstruct the semi-invisible events with the momenta of invisible particles and improving the measurements to reveal the properties of new physics
There has been several studies under gone into mass and spin determination in the context of semi-invisible production at the hadronic collider1 and we classify them based on the topology information as follows: Exclusive variables are defined based on the topology of the production mechanism and decay processes under consideration
Summary
Antler topology is very common and well motivated in SM Higgs production. Resonant Higgs production and its semi-invisible decays into W-boson, h → W W ∗ → lνlν or through τ decay h → τ τ → wντ wντ are some of the interesting channels. Any mass bound variable constructed by minimisation, such as, smin for antler topology needs to be bounded from above satisfying the relation smin ≤ sTrue This end point can be measured from the endpoint at the distribution over many events. Additional intermediate particle mass-shell constraints ensure a larger value of scmoinns over smin for each event This inequality would reflect in the mass variable distributions contributing larger number of events at the endpoint of the distribution. The red histogram shows the distribution for scmoinns, whereas the green binned histogram shows smin to compare the effect due to the extra constraints These distribution confirms that the number of events at the endpoint are considerably low as one increases the number of invisible particle in the final state. Observed small tail is because of finite width from φ++ and these extra constraints ensures that the ssmuibn,cons distribution starts from a threshold at the scale of 2mw
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